diff --git a/client/web/admin/src/components/CUploader.vue b/client/web/admin/src/components/CUploader.vue
index 281888285..1285620d0 100644
--- a/client/web/admin/src/components/CUploader.vue
+++ b/client/web/admin/src/components/CUploader.vue
@@ -11,7 +11,7 @@
     @vdropzone-error="onError"
     @vdropzone-upload-progress="onUploadProgress"
   >
-    <div class="w-100 h-100 position-relative bg-light">
+    <div class="w-100 h-100 position-relative bg-light rounded">
       <template v-if="active">
         <div
           class="bg-primary h-100 progress-bar position-absolute"
diff --git a/client/web/admin/src/components/Settings/System/CSystemEditorAuth.vue b/client/web/admin/src/components/Settings/System/CSystemEditorAuth.vue
index 908c1f1f2..347b12e00 100644
--- a/client/web/admin/src/components/Settings/System/CSystemEditorAuth.vue
+++ b/client/web/admin/src/components/Settings/System/CSystemEditorAuth.vue
@@ -43,6 +43,13 @@
         >
           {{ $t('internal.signup.enabled') }}
         </b-form-checkbox>
+        <b-form-checkbox
+          v-model="settings['auth.internal.profile-avatar.enabled']"
+          :value="true"
+          :unchecked-value="false"
+        >
+          {{ $t('internal.profile-avatar.enabled') }}
+        </b-form-checkbox>
       </b-form-group>
       <b-form-group
         label-cols="2"
diff --git a/client/web/admin/src/components/User/CUserEditorAvatar.vue b/client/web/admin/src/components/User/CUserEditorAvatar.vue
new file mode 100644
index 000000000..0840dd33e
--- /dev/null
+++ b/client/web/admin/src/components/User/CUserEditorAvatar.vue
@@ -0,0 +1,157 @@
+<template>
+  <b-card
+    class="shadow-sm"
+    data-test-id="card-user-info"
+    header-bg-variant="white"
+    footer-bg-variant="white"
+  >
+    <template #header>
+      <h3 class="m-0">
+        {{ $t('title') }}
+      </h3>
+    </template>
+
+    <b-form
+      enctype="multipart/form-data"
+      @submit.prevent="$emit('submit', user)"
+    >
+      <img
+        :src="uploadedAvatar('avatar')"
+        style="height: 4rem; width: 4rem;"
+        class="rounded-circle mb-4"
+      >
+
+      <div
+        class="d-flex align-items-center"
+      >
+        <c-uploader-with-preview
+          :endpoint="`/users/${user.userID}/avatar`"
+          :labels="$t('uploader', { returnObjects: true })"
+          @upload="$emit('onUpload')"
+          @clear="$emit('resetAttachment', 'avatar')"
+        />
+
+        <c-input-confirm
+          v-if="uploadedAvatar('avatar') && isKindAvatar"
+          size="lg"
+          size-confirm="lg"
+          variant="danger"
+          class="ml-2 h-100"
+          @confirmed="$emit('resetAttachment', 'avatar')"
+        >
+          {{ $t('general:label.delete') }}
+        </c-input-confirm>
+      </div>
+
+      <div class="form-row mt-3">
+        <b-form-group
+          :label="$t('initial.color')"
+          class="col"
+        >
+          <b-form-input
+            v-model="user.meta.avatarColor"
+            type="color"
+            data-test-id="input-handle"
+          />
+        </b-form-group>
+
+        <b-form-group
+          :label="$t('initial.backgroundColor')"
+          class="col"
+        >
+          <b-form-input
+            v-model="user.meta.avatarBgColor"
+            type="color"
+          />
+        </b-form-group>
+      </div>
+    </b-form>
+
+    <template #footer>
+      <c-submit-button
+        class="float-right"
+        :processing="processing"
+        :success="success"
+        :disabled="saveDisabled"
+        @submit="$emit('submit', user)"
+      />
+    </template>
+  </b-card>
+</template>
+
+<script>
+import { NoID } from '@cortezaproject/corteza-js'
+import CSubmitButton from 'corteza-webapp-admin/src/components/CSubmitButton'
+import CUploaderWithPreview from 'corteza-webapp-admin/src/components/CUploaderWithPreview'
+
+export default {
+  name: 'CUserEditorAvatar',
+
+  i18nOptions: {
+    namespaces: 'system.users',
+    keyPrefix: 'editor.avatar',
+  },
+
+  components: {
+    CSubmitButton,
+    CUploaderWithPreview,
+  },
+
+  props: {
+    user: {
+      type: Object,
+      required: true,
+    },
+
+    processing: {
+      type: Boolean,
+      value: false,
+    },
+
+    success: {
+      type: Boolean,
+      value: false,
+    },
+
+    canCreate: {
+      type: Boolean,
+      required: true,
+    },
+  },
+
+  computed: {
+    fresh () {
+      return !this.user.userID || this.user.userID === NoID
+    },
+
+    editable () {
+      return this.fresh ? this.canCreate : this.user.canUpdateUser
+    },
+
+    saveDisabled () {
+      return !this.editable
+    },
+
+    isKindAvatar () {
+      return this.user.meta.avatarKind === 'avatar'
+    },
+  },
+
+  methods: {
+    uploadedAvatar (name) {
+      const attachmentID = this.user.meta.avatarID
+
+      if (attachmentID !== '0') {
+        return (
+          this.$SystemAPI.baseURL +
+            this.$SystemAPI.attachmentOriginalEndpoint({
+              attachmentID,
+              kind: 'avatar',
+              name,
+            })
+        )
+      }
+    },
+  },
+}
+</script>
diff --git a/client/web/admin/src/views/System/User/Editor.vue b/client/web/admin/src/views/System/User/Editor.vue
index 4a9b1617d..17134bb02 100644
--- a/client/web/admin/src/views/System/User/Editor.vue
+++ b/client/web/admin/src/views/System/User/Editor.vue
@@ -52,6 +52,18 @@
       @sessionsRevoke="onSessionsRevoke"
     />
 
+    <c-user-editor-avatar
+      v-if="user && userID && $Settings.get('auth.internal.profile-avatar.Enabled', false)"
+      :user="user"
+      :processing="info.processing"
+      :success="info.success"
+      :can-create="canCreate"
+      class="mt-3"
+      @submit="onAvatarSubmit"
+      @onUpload="onAvatarUpload"
+      @resetAttachment="onResetAvatar"
+    />
+
     <c-user-editor-roles
       v-if="user && userID"
       v-model="membership.active"
@@ -92,6 +104,7 @@
 import { NoID, system } from '@cortezaproject/corteza-js'
 import editorHelpers from 'corteza-webapp-admin/src/mixins/editorHelpers'
 import CUserEditorInfo from 'corteza-webapp-admin/src/components/User/CUserEditorInfo'
+import CUserEditorAvatar from '../../../components/User/CUserEditorAvatar'
 import CUserEditorPassword from 'corteza-webapp-admin/src/components/User/CUserEditorPassword'
 import CUserEditorMfa from 'corteza-webapp-admin/src/components/User/CUserEditorMFA'
 import CUserEditorRoles from 'corteza-webapp-admin/src/components/User/CUserEditorRoles'
@@ -103,6 +116,7 @@ export default {
     CUserEditorRoles,
     CUserEditorPassword,
     CUserEditorInfo,
+    CUserEditorAvatar,
     CUserEditorMfa,
     CUserEditorExternalAuthProviders,
   },
@@ -271,6 +285,28 @@ export default {
       }
     },
 
+    onAvatarSubmit (user) {
+      this.info.processing = true
+
+      const payload = {
+        userID: user.userID,
+        avatarColor: user.meta.avatarColor,
+        avatarBgColor: user.meta.avatarBgColor,
+      }
+
+      this.$SystemAPI.userProfileAvatarInitial(payload)
+        .then(() => {
+          this.fetchUser()
+          this.$auth.handle()
+          this.animateSuccess('info')
+          this.toastSuccess(this.$t('notification:user.avatarUpload.success'))
+        })
+        .catch(this.toastErrorHandler(this.$t('notification:user.avatarUpload.error')))
+        .finally(() => {
+          this.info.processing = false
+        })
+    },
+
     /**
      * Handles user delete event, calls user delete API endpoint
      * and handles response & errors
@@ -451,6 +487,22 @@ export default {
           this.decLoader()
         })
     },
+
+    onAvatarUpload () {
+      this.fetchUser()
+    },
+
+    onResetAvatar () {
+      const userID = this.userID
+
+      this.$SystemAPI.userDeleteAvatar({ userID })
+        .then(() => {
+          this.fetchUser()
+
+          this.toastSuccess(this.$t('notification:user.avatarDelete.success'))
+        })
+        .catch(this.toastErrorHandler(this.$t('notification:user.avatarDelete.error')))
+    },
   },
 }
 </script>
diff --git a/lib/js/src/api-clients/system.ts b/lib/js/src/api-clients/system.ts
index 5e24a6001..2f5012109 100644
--- a/lib/js/src/api-clients/system.ts
+++ b/lib/js/src/api-clients/system.ts
@@ -1478,6 +1478,96 @@ export default class System {
     return `/users/${userID}/credentials/${credentialsID}`
   }
 
+  // User&#x27;s profile avatar
+  async userProfileAvatar (a: KV, extra: AxiosRequestConfig = {}): Promise<KV> {
+    const {
+      userID,
+      upload,
+      width,
+      height,
+    } = (a as KV) || {}
+    if (!userID) {
+      throw Error('field userID is empty')
+    }
+    const cfg: AxiosRequestConfig = {
+      ...extra,
+      method: 'post',
+      url: this.userProfileAvatarEndpoint({
+        userID,
+      }),
+    }
+    cfg.data = {
+      upload,
+      width,
+      height,
+    }
+    return this.api().request(cfg).then(result => stdResolve(result))
+  }
+
+  userProfileAvatarEndpoint (a: KV): string {
+    const {
+      userID,
+    } = a || {}
+    return `/users/${userID}/avatar`
+  }
+
+  // User profile avatar initial
+  async userProfileAvatarInitial (a: KV, extra: AxiosRequestConfig = {}): Promise<KV> {
+    const {
+      userID,
+      avatarColor,
+      avatarBgColor,
+    } = (a as KV) || {}
+    if (!userID) {
+      throw Error('field userID is empty')
+    }
+    const cfg: AxiosRequestConfig = {
+      ...extra,
+      method: 'post',
+      url: this.userProfileAvatarInitialEndpoint({
+        userID,
+      }),
+    }
+    cfg.data = {
+      avatarColor,
+      avatarBgColor,
+    }
+    return this.api().request(cfg).then(result => stdResolve(result))
+  }
+
+  userProfileAvatarInitialEndpoint (a: KV): string {
+    const {
+      userID,
+    } = a || {}
+    return `/users/${userID}/avatar-initial`
+  }
+
+  // delete user&#x27;s profile avatar
+  async userDeleteAvatar (a: KV, extra: AxiosRequestConfig = {}): Promise<KV> {
+    const {
+      userID,
+    } = (a as KV) || {}
+    if (!userID) {
+      throw Error('field userID is empty')
+    }
+    const cfg: AxiosRequestConfig = {
+      ...extra,
+      method: 'delete',
+      url: this.userDeleteAvatarEndpoint({
+        userID,
+      }),
+    }
+
+    return this.api().request(cfg).then(result => stdResolve(result))
+  }
+
+  userDeleteAvatarEndpoint (a: KV): string {
+    const {
+      userID,
+    } = a || {}
+    return `/users/${userID}/avatar`
+  }
+
   // Export users
   async userExport (a: KV, extra: AxiosRequestConfig = {}): Promise<KV> {
     const {
diff --git a/lib/js/src/system/types/user.ts b/lib/js/src/system/types/user.ts
index e9654bc49..0de36438b 100644
--- a/lib/js/src/system/types/user.ts
+++ b/lib/js/src/system/types/user.ts
@@ -11,6 +11,10 @@ interface PartialUser extends Partial<Omit<User, 'createdAt' | 'updatedAt' | 'de
 interface UserMeta {
   preferredLanguage?: string;
   securityPolicy?: SecurityPolicy;
+  avatarID?: string;
+  avatarKind?: string;
+  avatarColor?: string;
+  avatarBgColor?: string;
 }
 
 interface SecurityPolicy {
@@ -38,6 +42,10 @@ export class User {
         enforcedTOTP: false,
       },
     },
+    avatarID: NoID,
+    avatarKind: '',
+    avatarColor: '',
+    avatarBgColor: '',
   }
 
   public canGrant = false
diff --git a/lib/vue/src/components/navigation/CTopbar.vue b/lib/vue/src/components/navigation/CTopbar.vue
index 12a383668..3572968d0 100644
--- a/lib/vue/src/components/navigation/CTopbar.vue
+++ b/lib/vue/src/components/navigation/CTopbar.vue
@@ -107,15 +107,20 @@
       data-test-id="dropdown-profile"
       data-v-onboarding="profile"
       size="lg"
-      variant="outline-light"
+      :variant="avatarExists ? 'link' : 'outline-light'"
+      :class="{ 'avatar': avatarExists }"
       class="nav-user-icon"
       toggle-class="nav-icon text-decoration-none text-dark rounded-circle border"
+      :style="{
+        'background-image': avatarExists  ? `url(${profileAvatarUrl})` : 'none',
+      }"
       menu-class="topbar-dropdown-menu border-0 shadow-sm text-dark font-weight-bold mt-2"
       right
       no-caret
     >
       <template #button-content>
         <div
+          v-if="!avatarExists"
           class="d-flex align-items-center justify-content-center"
         >
           <font-awesome-icon
@@ -239,6 +244,14 @@ export default {
       /* eslint-disable no-undef */
       return VERSION
     },
+
+    profileAvatarUrl () {
+      return `${this.$SystemAPI.baseURL}/attachment/avatar/${this.$auth.user.meta.avatarID}/original/profile-photo-avatar`
+    },
+
+    avatarExists () {
+      return this.$auth.user.meta.avatarID !== "0" && this.$auth.user.meta.avatarID
+    },
   }
 }
 </script>
@@ -277,6 +290,17 @@ $nav-user-icon-size: 50px;
   overflow-y: auto;
 }
 
+.avatar {
+  border-radius: 50%;
+  background-size: cover;
+  background-repeat: no-repeat;
+  background-position: center;
+
+  &:hover {
+    opacity: 0.8;
+  }
+}
+
 .spacer {
   min-width: 0px;
   -webkit-transition: min-width 0.15s ease-in-out;
diff --git a/lib/vue/src/plugins/auth.ts b/lib/vue/src/plugins/auth.ts
index e9d9ac645..b7350e3af 100644
--- a/lib/vue/src/plugins/auth.ts
+++ b/lib/vue/src/plugins/auth.ts
@@ -2,6 +2,7 @@ import axios, { AxiosInstance } from 'axios'
 import { Make } from '../libs/url'
 import { system } from '@cortezaproject/corteza-js'
 import { PluginFunction } from 'vue'
+import { User } from '@cortezaproject/corteza-js/dist/system'
 
 const accessToken = Symbol('accessToken')
 const user = Symbol('user')
@@ -44,6 +45,7 @@ interface OAuth2TokenResponse {
   handle?: string;
   email?: string;
   preferred_language?: string;
+  avatarID?: string;
 }
 
 interface PluginOpts {
@@ -577,6 +579,8 @@ export class Auth {
       u.meta.preferredLanguage = oa2tkn.preferred_language
     }
 
+    u.meta.avatarID = oa2tkn.avatarID
+
     this[accessToken] = oa2tkn.access_token
     this[user] = u
 
diff --git a/locale/en/corteza-server/auth/profile.yaml b/locale/en/corteza-server/auth/profile.yaml
index daa353b8b..f2dd41c15 100644
--- a/locale/en/corteza-server/auth/profile.yaml
+++ b/locale/en/corteza-server/auth/profile.yaml
@@ -11,6 +11,14 @@ template:
     handle:
       label: Handle
       placeholder: Short name, nickname or handle
+    avatar:
+      label: Avatar
+      delete: Delete
+      upload: Upload avatar
+    avatar-initial:
+      label: Avatar initial
+      color: Avatar text color
+      background-color: Avatar background color
     preferred-language:
       label: Preferred language
     buttons:
@@ -18,3 +26,5 @@ template:
 alerts:
   profile-updated: Profile successfully updated
   profile-update-fail: Could not update profile due to input errors
+  profile-avatar-uploaded: Profile avatar successfully uploaded
+  profile-avatar-deleted: Profile avatar successfully deleted
diff --git a/locale/en/corteza-webapp-admin/notification.yaml b/locale/en/corteza-webapp-admin/notification.yaml
index 5f800cf8a..725f27b7f 100644
--- a/locale/en/corteza-webapp-admin/notification.yaml
+++ b/locale/en/corteza-webapp-admin/notification.yaml
@@ -43,6 +43,12 @@ user:
     error: User suspension failed
   import:
     success: Users imported successfully
+  avatarUpload:
+    success: Avatar uploaded
+    error: Avatar upload failed
+  avatarDelete:
+    success: Avatar deleted
+    error: Avatar delete failed
 role:
   fetch:
     error: Role fetch failed
diff --git a/locale/en/corteza-webapp-admin/system.settings.yaml b/locale/en/corteza-webapp-admin/system.settings.yaml
index 35c93c839..c5e4e2794 100644
--- a/locale/en/corteza-webapp-admin/system.settings.yaml
+++ b/locale/en/corteza-webapp-admin/system.settings.yaml
@@ -27,6 +27,8 @@ editor:
         split-credentials-check:
           description: 'Split login into two steps: collect the email input first and show the input for the password on the 2nd screen. Automatically forward user to external identity provider when user does not have his password set and there is only one IdP present'
           label: Enable split-credentials check
+      profile-avatar:
+        enabled: Profile avatar enabled
     mail:
       title: Authentication email sender mail
       from-address: Sender's address
@@ -124,13 +126,13 @@ editor:
         label: Permitted roles
 
   bgScreen:
-      title: Auth Background Screen
+    title: Auth background screen
 
-      image:
-        uploader:
-          title: Background Image
-          instructions: Click or drop background image here to upload
-          uploading: Uploading auth background image
+    image:
+      uploader:
+        title: Background image
+        instructions: Click or drop background image here to upload
+        uploading: Uploading auth background image
 
-        editor:
-          title: Styles editor
\ No newline at end of file
+      editor:
+        title: Styles editor
\ No newline at end of file
diff --git a/locale/en/corteza-webapp-admin/system.users.yaml b/locale/en/corteza-webapp-admin/system.users.yaml
index 1ed8f8e5a..feebadbf1 100644
--- a/locale/en/corteza-webapp-admin/system.users.yaml
+++ b/locale/en/corteza-webapp-admin/system.users.yaml
@@ -20,6 +20,17 @@ editor:
     undelete: Undelete
     unsuspend: Unsuspend
     updatedAt: Updated at
+  avatar:
+      title: Profile avatar
+      preview:
+        label: Avatar
+        title: Avatar
+      initial:
+        color: Text color
+        backgroundColor: Background color
+      uploader:
+        instructions: Upload avatar
+        uploading: Uploading user avatar
   mfa:
     TOTP:
       disabled:
diff --git a/server/.env.example b/server/.env.example
index 914ae043e..192251c7b 100644
--- a/server/.env.example
+++ b/server/.env.example
@@ -1290,3 +1290,32 @@
 # Type:    string
 # Default: <no value>
 # DISCOVERY_BASE_URL=<no value>
+
+###############################################################################
+###############################################################################
+# attachment
+#
+
+###############################################################################
+# Avatar image maximum upload size, default value is 1MB
+# Type:    int64
+# Default: <no value>
+# ATTACHMENT_AVATAR_MAX_FILE_SIZE=<no value>
+
+###############################################################################
+# Avatar initials font file path
+# Type:    string
+# Default: ./auth/assets/public/fonts/poppins/Poppins-Regular.ttf
+# AVATAR_INITIALS_FONT_PATH=./auth/assets/public/fonts/poppins/Poppins-Regular.ttf
+
+###############################################################################
+# Avatar initials background color
+# Type:    string
+# Default: #F3F3F3
+# AVATAR_INITIALS_BACKGROUND_COLOR=#F3F3F3
+
+###############################################################################
+# Avatar initials text color
+# Type:    string
+# Default: #162425
+# AVATAR_INITIALS_COLOR=#162425
diff --git a/server/app/app.cue b/server/app/app.cue
index 5562b6db1..27744b159 100644
--- a/server/app/app.cue
+++ b/server/app/app.cue
@@ -40,6 +40,7 @@ corteza: schema.#platform & {
 		options.websocket,
 		options.workflow,
 		options.discovery,
+		options.attachment,
 	]
 
 	// platform resources
diff --git a/server/app/boot_levels.go b/server/app/boot_levels.go
index 64b6c87d9..5ee1d3a3d 100644
--- a/server/app/boot_levels.go
+++ b/server/app/boot_levels.go
@@ -365,14 +365,15 @@ func (app *CortezaApp) InitServices(ctx context.Context) (err error) {
 	// Note: this is a legacy approach, all services from all 3 apps
 	// will most likely be merged in the future
 	err = sysService.Initialize(ctx, app.Log, app.Store, app.WsServer, sysService.Config{
-		ActionLog: app.Opt.ActionLog,
-		Discovery: app.Opt.Discovery,
-		Storage:   app.Opt.ObjStore,
-		Template:  app.Opt.Template,
-		DB:        app.Opt.DB,
-		Auth:      app.Opt.Auth,
-		RBAC:      app.Opt.RBAC,
-		Limit:     app.Opt.Limit,
+		ActionLog:  app.Opt.ActionLog,
+		Discovery:  app.Opt.Discovery,
+		Storage:    app.Opt.ObjStore,
+		Template:   app.Opt.Template,
+		DB:         app.Opt.DB,
+		Auth:       app.Opt.Auth,
+		RBAC:       app.Opt.RBAC,
+		Limit:      app.Opt.Limit,
+		Attachment: app.Opt.Attachment,
 	})
 
 	if err != nil {
@@ -622,6 +623,7 @@ func updateAuthSettings(svc authServicer, current *types.AppSettings) {
 		PasswordCreateEnabled:     current.Auth.Internal.PasswordCreate.Enabled,
 		SplitCredentialsCheck:     current.Auth.Internal.SplitCredentialsCheck,
 		ExternalEnabled:           current.Auth.External.Enabled,
+		ProfileAvatarEnabled:      current.Auth.Internal.ProfileAvatar.Enabled,
 		MultiFactor: authSettings.MultiFactor{
 			TOTP: authSettings.TOTP{
 				Enabled:  current.Auth.MultiFactor.TOTP.Enabled,
diff --git a/server/app/options/attachment.cue b/server/app/options/attachment.cue
new file mode 100644
index 000000000..b5173e902
--- /dev/null
+++ b/server/app/options/attachment.cue
@@ -0,0 +1,32 @@
+package options
+
+import (
+	"github.com/cortezaproject/corteza/server/codegen/schema"
+)
+
+attachment: schema.#optionsGroup & {
+	handle: "attachment"
+
+	options: {
+		avatar_max_file_size: {
+			type: "int64"
+			defaultGoExpr: "1000000"
+			description:  "Avatar image maximum upload size, default value is 1MB"
+		}
+		avatar_initials_font_path: {
+			defaultValue: "./auth/assets/public/fonts/poppins/Poppins-Regular.ttf"
+			description:  "Avatar initials font file path"
+			env:          "AVATAR_INITIALS_FONT_PATH"
+		}
+		avatar_initials_background_color: {
+			defaultValue: "#F3F3F3"
+			description:  "Avatar initials background color"
+			env:          "AVATAR_INITIALS_BACKGROUND_COLOR"
+		}
+		avatar_initials_color: {
+			defaultValue: "#162425"
+			description:  "Avatar initials text color"
+			env:          "AVATAR_INITIALS_COLOR"
+		}
+	}
+}
diff --git a/server/auth/assets/public/script.js b/server/auth/assets/public/script.js
index e926e1c94..b7e2db26a 100644
--- a/server/auth/assets/public/script.js
+++ b/server/auth/assets/public/script.js
@@ -11,4 +11,8 @@ $(function () {
   })
 
   $('input.mfa-code-mask').mask('000 000')
+
+  $('#avatar').change(function () {
+    $('form').submit();
+  })
 })
diff --git a/server/auth/assets/public/style.css b/server/auth/assets/public/style.css
index 18bc0cfce..f4791cd67 100644
--- a/server/auth/assets/public/style.css
+++ b/server/auth/assets/public/style.css
@@ -113,6 +113,10 @@ a:hover {
   padding: 1.25rem 0.75rem;
 }
 
+.input-color {
+  padding: 0.125rem 0.25rem;
+}
+
 select.form-control {
   padding: 0 0.5rem;
 }
diff --git a/server/auth/assets/templates/profile.html.tpl b/server/auth/assets/templates/profile.html.tpl
index 33f935d2a..7561a2823 100644
--- a/server/auth/assets/templates/profile.html.tpl
+++ b/server/auth/assets/templates/profile.html.tpl
@@ -1,9 +1,11 @@
 {{ template "inc_header.html.tpl" set . "activeNav" "profile" }}
 <div class="card-body p-0">
 	<h4 class="card-title p-3 border-bottom">{{ tr "profile.template.title" }}</h4>
+
 	<form
 		method="POST"
 		action="{{ links.Profile }}"
+        enctype="multipart/form-data"
 		class="p-3"
 	>
 		{{ .csrfField }}
@@ -94,6 +96,44 @@
 			</select>
 		</div>
 
+        {{ if .avatarEnabled }}
+        <hr/>
+        <div class="mb-3">
+            <label for="profileFormHandle">{{ tr "profile.template.form.avatar.label" }}</label>
+            <div class="d-block">
+                <img style="height: 4rem; width: 4rem;" class="rounded-circle" src="{{ .form.avatarUrl }}" alt="Profile Photo">
+                <div class="mt-3">
+                    <label for="avatar" class="p-2 bg-light text-dark rounded" style="cursor: pointer;">
+                    {{ tr "profile.template.form.avatar.upload" }}
+                    </label>
+                    <input id="avatar" name="avatar" value="avatar" type="file" class="sr-only" accept="image/*">
+
+                    {{  if .isAvatar }}
+                    <button
+                        name="avatar-delete"
+                        value="avatar-delete"
+                        class="ml-2 btn btn-danger"
+                    >
+                        {{ tr "profile.template.form.avatar.delete" }}
+                    </button>
+                    {{ end }}
+                </div>
+            </div>
+        </div>
+
+        <div class="form-row mb-3">
+            <div class="col">
+                <label for="initialColor">{{ tr "profile.template.form.avatar-initial.color" }}</label>
+                <input type="color" id="initialColor" class="form-control input-color" value="{{ .form.initialTextColor }}" name="initial-color">
+            </div>
+
+            <div class="col">
+                <label for="customColor">{{ tr "profile.template.form.avatar-initial.background-color" }}</label>
+                <input type="color" id="customColor" class="form-control input-color" value="{{ .form.initialBgColor }}" name="initial-bg">
+            </div>
+        </div>
+        {{ end }}
+
         <div>
             <button
                 data-test-id="button-submit"
diff --git a/server/auth/auth.go b/server/auth/auth.go
index 7b74d4fcd..6c2ad549d 100644
--- a/server/auth/auth.go
+++ b/server/auth/auth.go
@@ -197,6 +197,7 @@ func New(ctx context.Context, log *zap.Logger, oa2m oauth2def.Manager, s store.S
 		DefaultClient:      defClient,
 		Opt:                svc.opt,
 		Settings:           svc.settings,
+		Attachment:         systemService.DefaultAttachment,
 	}
 
 	external.Init(sesManager.Store())
diff --git a/server/auth/handlers/handle_oauth2.go b/server/auth/handlers/handle_oauth2.go
index 0ff676d09..0338ab494 100644
--- a/server/auth/handlers/handle_oauth2.go
+++ b/server/auth/handlers/handle_oauth2.go
@@ -225,6 +225,7 @@ func (h AuthHandlers) oauth2Info(w http.ResponseWriter, r *http.Request) {
 // Responsibilities:
 //   - handles parameterless request to initialize authorization code flow
 //   - accepts redirect_uri via query string that's used to build the oauth2 authorization URL
+//
 // (for the rest of the flow, see oauth2authorizeDefaultClientProc)
 func (h AuthHandlers) oauth2authorizeDefaultClient(req *request.AuthReq) (err error) {
 	if err = h.verifyDefaultClient(); err != nil {
@@ -260,6 +261,7 @@ func (h AuthHandlers) oauth2authorizeDefaultClient(req *request.AuthReq) (err er
 // Responsibilities:
 //   - handles exchange of authorization-code for token
 //   - handles issuing of new access token requests
+//
 // (for the first part of the flow, see oauth2authorizeDefaultClient)
 func (h AuthHandlers) oauth2authorizeDefaultClientProc(req *request.AuthReq) (err error) {
 	if err = h.verifyDefaultClient(); err != nil {
@@ -437,6 +439,11 @@ func (h AuthHandlers) handleTokenRequest(req *request.AuthReq, client *types.Aut
 
 	response := h.OAuth2.GetTokenData(ti)
 
+	// include user's avatarID
+	if user.Meta.AvatarID != 0 {
+		response["avatarID"] = strconv.FormatUint(user.Meta.AvatarID, 10)
+	}
+
 	// in case client is configured with "openid" scope,
 	// we'll add "id_token" with all required (by OIDC) details encoded
 	if strings.Contains(client.Scope, "openid") {
diff --git a/server/auth/handlers/handle_profile.go b/server/auth/handlers/handle_profile.go
index 4a991b4f7..fa256b145 100644
--- a/server/auth/handlers/handle_profile.go
+++ b/server/auth/handlers/handle_profile.go
@@ -1,21 +1,28 @@
 package handlers
 
 import (
+	"fmt"
 	"github.com/cortezaproject/corteza/server/auth/request"
 	"github.com/cortezaproject/corteza/server/system/service"
 	"github.com/cortezaproject/corteza/server/system/types"
 	"go.uber.org/zap"
 )
 
-func (h *AuthHandlers) profileForm(req *request.AuthReq) error {
+func (h *AuthHandlers) profileForm(req *request.AuthReq) (err error) {
 	req.Template = TmplProfile
 
 	var (
 		preferredLanguage string
-
-		u = req.AuthUser.User
+		avatarUrl         string
 	)
 
+	u, err := h.UserService.FindByAny(req.Context(), req.AuthUser.User.ID)
+
+	if err != nil {
+		h.Log.Error("find user error", zap.Error(err))
+		return err
+	}
+
 	if langList := h.Locale.LocalizedList(req.Context()); len(langList) > 0 {
 		req.Data["languages"] = langList
 
@@ -25,6 +32,8 @@ func (h *AuthHandlers) profileForm(req *request.AuthReq) error {
 		}
 	}
 
+	avatarUrl = fmt.Sprintf("%sapi/system/attachment/avatar/%d/original/%s", GetLinks().Base, u.Meta.AvatarID, types.AttachmentKindAvatar)
+
 	if form := req.PopKV(); len(form) > 0 {
 		req.Data["form"] = form
 	} else {
@@ -33,17 +42,39 @@ func (h *AuthHandlers) profileForm(req *request.AuthReq) error {
 			"handle":            u.Handle,
 			"name":              u.Name,
 			"preferredLanguage": preferredLanguage,
+			"avatarUrl":         avatarUrl,
+			"initialTextColor":  u.Meta.AvatarColor,
+			"initialBgColor":    u.Meta.AvatarBgColor,
 		}
 	}
 
 	req.Data["emailConfirmationRequired"] = !u.EmailConfirmed && h.Settings.EmailConfirmationRequired
+	req.Data["avatarEnabled"] = h.Settings.ProfileAvatarEnabled
+
+	if h.Settings.ProfileAvatarEnabled {
+		req.Data["isAvatar"] = false
+
+		if u.Meta.AvatarKind == types.AttachmentKindAvatar {
+			req.Data["isAvatar"] = true
+		}
+	}
+
 	return nil
 }
 
 func (h *AuthHandlers) profileProc(req *request.AuthReq) error {
 	req.RedirectTo = GetLinks().Profile
 	req.SetKV(nil)
-	u := req.AuthUser.User
+
+	var (
+		t = translator(req, "auth")
+	)
+
+	u, err := h.UserService.FindByAny(req.Context(), req.AuthUser.User.ID)
+	if err != nil {
+		h.Log.Error("find user error", zap.Error(err))
+		return err
+	}
 
 	u.Handle = req.Request.PostFormValue("handle")
 	u.Name = req.Request.PostFormValue("name")
@@ -60,6 +91,35 @@ func (h *AuthHandlers) profileProc(req *request.AuthReq) error {
 	// this way user service will pass us through.
 	user, err := h.UserService.Update(req.Context(), u)
 
+	// process avatar initial generation
+	bgColor := req.Request.PostFormValue("initial-bg")
+	initialColor := req.Request.PostFormValue("initial-color")
+	if bgColor != u.Meta.AvatarBgColor || initialColor != u.Meta.AvatarColor {
+		err = h.UserService.GenerateAvatar(
+			req.Context(),
+			u.ID,
+			bgColor,
+			initialColor,
+		)
+	}
+
+	// process avatar upload
+	_, header, _ := req.Request.FormFile("avatar")
+	if header != nil {
+		err = h.UserService.UploadAvatar(
+			req.Context(),
+			u.ID,
+			header,
+		)
+	}
+
+	// Process avatar delete
+	if req.Request.PostFormValue("avatar-delete") == "avatar-delete" {
+		if err = h.UserService.DeleteAvatar(req.Context(), u.ID); err != nil {
+			return err
+		}
+	}
+
 	if err == nil {
 		err = h.AuthService.LoadRoleMemberships(req.Context(), user)
 	}
@@ -68,7 +128,6 @@ func (h *AuthHandlers) profileProc(req *request.AuthReq) error {
 		req.AuthUser.User = user
 		req.AuthUser.Save(req.Session)
 
-		t := translator(req, "auth")
 		req.NewAlerts = append(req.NewAlerts, request.Alert{
 			Type: "primary",
 			Text: t("profile.alerts.profile-updated"),
@@ -78,18 +137,25 @@ func (h *AuthHandlers) profileProc(req *request.AuthReq) error {
 		return nil
 	}
 
+	avatarUrl := fmt.Sprintf("%sapi/system/attachment/avatar/%d/original/%s", GetLinks().Base, u.Meta.AvatarID, types.AttachmentKindAvatar)
 	switch {
 	case
 		service.UserErrInvalidID().Is(err),
 		service.UserErrInvalidHandle().Is(err),
 		service.UserErrInvalidEmail().Is(err),
 		service.UserErrHandleNotUnique().Is(err),
-		service.UserErrNotAllowedToUpdate().Is(err):
+		service.UserErrNotAllowedToUpdate().Is(err),
+		service.AttachmentErrInvalidAvatarFileType().Is(err),
+		service.AttachmentErrInvalidAvatarFileSize().Is(err),
+		service.AttachmentErrInvalidInitialsLength().Is(err):
 		req.SetKV(map[string]string{
-			"error":  err.Error(),
-			"email":  u.Email,
-			"handle": u.Handle,
-			"name":   u.Name,
+			"error":            err.Error(),
+			"email":            u.Email,
+			"handle":           u.Handle,
+			"name":             u.Name,
+			"avatarUrl":        avatarUrl,
+			"initialTextColor": u.Meta.AvatarColor,
+			"initialBgColor":   u.Meta.AvatarBgColor,
 		})
 
 		t := translator(req, "auth")
diff --git a/server/auth/handlers/handle_profile_test.go b/server/auth/handlers/handle_profile_test.go
index d267d80f1..08253d6d6 100644
--- a/server/auth/handlers/handle_profile_test.go
+++ b/server/auth/handlers/handle_profile_test.go
@@ -2,6 +2,7 @@ package handlers
 
 import (
 	"context"
+	"fmt"
 	"net/http"
 	"net/url"
 	"testing"
@@ -22,6 +23,7 @@ func Test_profileForm(t *testing.T) {
 		}
 
 		authService  authService
+		userService  userService
 		authHandlers *AuthHandlers
 		authReq      *request.AuthReq
 
@@ -32,14 +34,28 @@ func Test_profileForm(t *testing.T) {
 		rq = require.New(t)
 	)
 
+	userService = &userServiceMocked{
+		findByAny: func(ctx context.Context, i interface{}) (*types.User, error) {
+			u := makeMockUser()
+			u.ID = i.(uint64)
+
+			return u, nil
+		},
+	}
 	authHandlers = prepareClientAuthHandlers(authService, authSettings)
+	authHandlers.UserService = userService
 	authReq = prepareClientAuthReq(authHandlers, req, user)
 
+	avatarUrl := fmt.Sprintf("/api/system/attachment/avatar/%d/original/%s", user.Meta.AvatarID, types.AttachmentKindAvatar)
+
 	userForm := map[string]string{
 		"email":             user.Email,
 		"handle":            user.Handle,
 		"name":              user.Name,
+		"avatarUrl":         avatarUrl,
 		"preferredLanguage": user.Meta.PreferredLanguage,
+		"initialTextColor":  user.Meta.AvatarColor,
+		"initialBgColor":    user.Meta.AvatarBgColor,
 	}
 
 	authReq.SetKV(map[string]string{})
@@ -69,7 +85,7 @@ func Test_profileFormProc(t *testing.T) {
 	tcc := []testingExpect{
 		{
 			name:    "success",
-			err:     "",
+			err:     "request Content-Type isn't multipart/form-data",
 			alerts:  []request.Alert{{Type: "primary", Text: "profile.alerts.profile-updated", Html: ""}},
 			link:    GetLinks().Profile,
 			payload: map[string]string(nil),
@@ -84,17 +100,31 @@ func Test_profileFormProc(t *testing.T) {
 						u = makeMockUser()
 						u.SetRoles()
 
+						return u, nil
+					},
+					findByAny: func(ctx context.Context, i interface{}) (*types.User, error) {
+						u := makeMockUser()
+						u.ID = i.(uint64)
+
 						return u, nil
 					},
 				}
 			},
 		},
 		{
-			name:    "proc invalid ID",
-			err:     "",
-			alerts:  []request.Alert{{Type: "danger", Text: "profile.alerts.profile-update-fail", Html: ""}},
-			link:    GetLinks().Profile,
-			payload: map[string]string{"email": "mockuser@example.tld", "error": "invalid ID", "handle": "handle", "name": "name"},
+			name:   "proc invalid ID",
+			err:    "",
+			alerts: []request.Alert{{Type: "danger", Text: "profile.alerts.profile-update-fail", Html: ""}},
+			link:   GetLinks().Profile,
+			payload: map[string]string{
+				"email":            "mockuser@example.tld",
+				"error":            "invalid ID",
+				"handle":           "handle",
+				"name":             "name",
+				"initialBgColor":   "",
+				"initialTextColor": "",
+				"avatarUrl":        "/api/system/attachment/avatar/0/original/avatar",
+			},
 			fn: func(_ *settings.Settings) {
 				req.PostForm.Add("handle", "handle")
 				req.PostForm.Add("name", "name")
@@ -103,15 +133,29 @@ func Test_profileFormProc(t *testing.T) {
 					update: func(c context.Context, u *types.User) (*types.User, error) {
 						return nil, service.UserErrInvalidID()
 					},
+					findByAny: func(ctx context.Context, i interface{}) (*types.User, error) {
+						u := makeMockUser()
+						u.ID = i.(uint64)
+
+						return u, nil
+					},
 				}
 			},
 		},
 		{
-			name:    "proc invalid handle",
-			err:     "",
-			alerts:  []request.Alert{{Type: "danger", Text: "profile.alerts.profile-update-fail", Html: ""}},
-			link:    GetLinks().Profile,
-			payload: map[string]string{"email": "mockuser@example.tld", "error": "invalid handle", "handle": "handle", "name": "name"},
+			name:   "proc invalid handle",
+			err:    "",
+			alerts: []request.Alert{{Type: "danger", Text: "profile.alerts.profile-update-fail", Html: ""}},
+			link:   GetLinks().Profile,
+			payload: map[string]string{
+				"email":            "mockuser@example.tld",
+				"error":            "invalid handle",
+				"handle":           "handle",
+				"name":             "name",
+				"initialBgColor":   "",
+				"initialTextColor": "",
+				"avatarUrl":        "/api/system/attachment/avatar/0/original/avatar",
+			},
 			fn: func(_ *settings.Settings) {
 				req.PostForm.Add("handle", "handle")
 				req.PostForm.Add("name", "name")
@@ -120,15 +164,29 @@ func Test_profileFormProc(t *testing.T) {
 					update: func(c context.Context, u *types.User) (*types.User, error) {
 						return nil, service.UserErrInvalidHandle()
 					},
+					findByAny: func(ctx context.Context, i interface{}) (*types.User, error) {
+						u := makeMockUser()
+						u.ID = i.(uint64)
+
+						return u, nil
+					},
 				}
 			},
 		},
 		{
-			name:    "proc invalid email",
-			err:     "",
-			alerts:  []request.Alert{{Type: "danger", Text: "profile.alerts.profile-update-fail", Html: ""}},
-			link:    GetLinks().Profile,
-			payload: map[string]string{"email": "mockuser@example.tld", "error": "invalid email", "handle": "handle", "name": "name"},
+			name:   "proc invalid email",
+			err:    "",
+			alerts: []request.Alert{{Type: "danger", Text: "profile.alerts.profile-update-fail", Html: ""}},
+			link:   GetLinks().Profile,
+			payload: map[string]string{
+				"email":            "mockuser@example.tld",
+				"error":            "invalid email",
+				"handle":           "handle",
+				"name":             "name",
+				"initialBgColor":   "",
+				"initialTextColor": "",
+				"avatarUrl":        "/api/system/attachment/avatar/0/original/avatar",
+			},
 			fn: func(_ *settings.Settings) {
 				req.PostForm.Add("handle", "handle")
 				req.PostForm.Add("name", "name")
@@ -137,15 +195,29 @@ func Test_profileFormProc(t *testing.T) {
 					update: func(c context.Context, u *types.User) (*types.User, error) {
 						return nil, service.UserErrInvalidEmail()
 					},
+					findByAny: func(ctx context.Context, i interface{}) (*types.User, error) {
+						u := makeMockUser()
+						u.ID = i.(uint64)
+
+						return u, nil
+					},
 				}
 			},
 		},
 		{
-			name:    "proc handle not unique",
-			err:     "",
-			alerts:  []request.Alert{{Type: "danger", Text: "profile.alerts.profile-update-fail", Html: ""}},
-			link:    GetLinks().Profile,
-			payload: map[string]string{"email": "mockuser@example.tld", "error": "handle not unique", "handle": "handle", "name": "name"},
+			name:   "proc handle not unique",
+			err:    "",
+			alerts: []request.Alert{{Type: "danger", Text: "profile.alerts.profile-update-fail", Html: ""}},
+			link:   GetLinks().Profile,
+			payload: map[string]string{
+				"email":            "mockuser@example.tld",
+				"error":            "handle not unique",
+				"handle":           "handle",
+				"name":             "name",
+				"initialBgColor":   "",
+				"initialTextColor": "",
+				"avatarUrl":        "/api/system/attachment/avatar/0/original/avatar",
+			},
 			fn: func(_ *settings.Settings) {
 				req.PostForm.Add("handle", "handle")
 				req.PostForm.Add("name", "name")
@@ -154,15 +226,29 @@ func Test_profileFormProc(t *testing.T) {
 					update: func(c context.Context, u *types.User) (*types.User, error) {
 						return nil, service.UserErrHandleNotUnique()
 					},
+					findByAny: func(ctx context.Context, i interface{}) (*types.User, error) {
+						u := makeMockUser()
+						u.ID = i.(uint64)
+
+						return u, nil
+					},
 				}
 			},
 		},
 		{
-			name:    "user.errors.notAllowedToUpdate",
-			err:     "",
-			alerts:  []request.Alert{{Type: "danger", Text: "profile.alerts.profile-update-fail", Html: ""}},
-			link:    GetLinks().Profile,
-			payload: map[string]string{"email": "mockuser@example.tld", "error": "not allowed to update this user", "handle": "handle", "name": "name"},
+			name:   "user.errors.notAllowedToUpdate",
+			err:    "",
+			alerts: []request.Alert{{Type: "danger", Text: "profile.alerts.profile-update-fail", Html: ""}},
+			link:   GetLinks().Profile,
+			payload: map[string]string{
+				"email":            "mockuser@example.tld",
+				"error":            "not allowed to update this user",
+				"handle":           "handle",
+				"name":             "name",
+				"initialBgColor":   "",
+				"initialTextColor": "",
+				"avatarUrl":        "/api/system/attachment/avatar/0/original/avatar",
+			},
 			fn: func(_ *settings.Settings) {
 				req.PostForm.Add("handle", "handle")
 				req.PostForm.Add("name", "name")
@@ -171,6 +257,12 @@ func Test_profileFormProc(t *testing.T) {
 					update: func(c context.Context, u *types.User) (*types.User, error) {
 						return nil, service.UserErrNotAllowedToUpdate()
 					},
+					findByAny: func(ctx context.Context, i interface{}) (*types.User, error) {
+						u := makeMockUser()
+						u.ID = i.(uint64)
+
+						return u, nil
+					},
 				}
 			},
 		},
diff --git a/server/auth/handlers/handler.go b/server/auth/handlers/handler.go
index bf8ab0541..da730f9a5 100644
--- a/server/auth/handlers/handler.go
+++ b/server/auth/handlers/handler.go
@@ -6,11 +6,14 @@ import (
 	"fmt"
 	"html/template"
 	"io"
+	"mime/multipart"
 	"net/http"
 	"net/url"
 	"strings"
 	"time"
 
+	"github.com/cortezaproject/corteza/server/system/service"
+
 	"github.com/cortezaproject/corteza/server/auth/external"
 	"github.com/cortezaproject/corteza/server/auth/request"
 	"github.com/cortezaproject/corteza/server/auth/saml"
@@ -62,6 +65,9 @@ type (
 	userService interface {
 		FindByAny(ctx context.Context, identifier interface{}) (*types.User, error)
 		Update(context.Context, *types.User) (*types.User, error)
+		UploadAvatar(ctx context.Context, userID uint64, upload *multipart.FileHeader) (err error)
+		GenerateAvatar(ctx context.Context, userID uint64, bgColor string, initialColor string) (err error)
+		DeleteAvatar(ctx context.Context, userID uint64) (err error)
 	}
 
 	clientService interface {
@@ -121,6 +127,7 @@ type (
 		Opt                options.AuthOpt
 		Settings           *settings.Settings
 		SamlSPService      *saml.SamlSPService
+		Attachment         service.AttachmentService
 	}
 
 	handlerFn func(req *request.AuthReq) error
diff --git a/server/auth/handlers/links.go b/server/auth/handlers/links.go
index b9cc7c0c4..294f7be15 100644
--- a/server/auth/handlers/links.go
+++ b/server/auth/handlers/links.go
@@ -28,6 +28,7 @@ type (
 		OAuth2AuthorizeClient,
 		OAuth2Token,
 		OAuth2Info,
+		OAuth2UserInfo,
 		OAuth2DefaultClient,
 		OAuth2PublicKeys,
 
@@ -81,6 +82,7 @@ func GetLinks() Links {
 		OAuth2AuthorizeClient: b + "auth/oauth2/authorize-client",
 		OAuth2Token:           b + "auth/oauth2/token",
 		OAuth2Info:            b + "auth/oauth2/info",
+		OAuth2UserInfo:        b + "auth/oauth2/userinfo",
 		OAuth2DefaultClient:   b + "auth/oauth2/default-client",
 		OAuth2PublicKeys:      b + "auth/oauth2/public-keys",
 
diff --git a/server/auth/handlers/mock_test.go b/server/auth/handlers/mock_test.go
index 26da1885e..944da712f 100644
--- a/server/auth/handlers/mock_test.go
+++ b/server/auth/handlers/mock_test.go
@@ -2,6 +2,8 @@ package handlers
 
 import (
 	"context"
+	"go.uber.org/zap"
+	"mime/multipart"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -16,7 +18,6 @@ import (
 	"github.com/go-oauth2/oauth2/v4"
 	"github.com/go-oauth2/oauth2/v4/server"
 	"github.com/gorilla/sessions"
-	"go.uber.org/zap"
 )
 
 type (
@@ -73,8 +74,11 @@ type (
 	}
 
 	userServiceMocked struct {
-		update    func(context.Context, *types.User) (*types.User, error)
-		findByAny func(context.Context, interface{}) (*types.User, error)
+		update         func(context.Context, *types.User) (*types.User, error)
+		findByAny      func(context.Context, interface{}) (*types.User, error)
+		uploadAvatar   func(context.Context, uint64, *multipart.FileHeader) error
+		generateAvatar func(context.Context, uint64, string, string) error
+		deleteAvatar   func(context.Context, uint64) error
 	}
 
 	authServiceMocked struct {
@@ -100,9 +104,19 @@ type (
 	}
 )
 
-//
+func (u userServiceMocked) UploadAvatar(ctx context.Context, userID uint64, upload *multipart.FileHeader) (err error) {
+	return u.uploadAvatar(ctx, userID, upload)
+}
+
+func (u userServiceMocked) GenerateAvatar(ctx context.Context, userID uint64, bgColor string, initialColor string) (err error) {
+	return u.generateAvatar(ctx, userID, bgColor, initialColor)
+}
+
+func (u userServiceMocked) DeleteAvatar(ctx context.Context, userID uint64) (err error) {
+	return u.deleteAvatar(ctx, userID)
+}
+
 // Mocking userService
-//
 func (u userServiceMocked) Update(ctx context.Context, user *types.User) (*types.User, error) {
 	return u.update(ctx, user)
 }
@@ -111,9 +125,7 @@ func (u userServiceMocked) FindByAny(ctx context.Context, any interface{}) (*typ
 	return u.findByAny(ctx, any)
 }
 
-//
 // Mocking authService
-//
 func (s authServiceMocked) External(ctx context.Context, profile types.ExternalAuthUser) (u *types.User, err error) {
 	return s.external(ctx, profile)
 }
@@ -191,9 +203,7 @@ func (s authServiceMocked) LoadRoleMemberships(ctx context.Context, u *types.Use
 	return nil
 }
 
-//
 // Mocking oauth2Service
-//
 func (s *oauth2ServiceMocked) GetRedirectURI(req *server.AuthorizeRequest, data map[string]interface{}) (string, error) {
 	return s.GetRedirectURI(req, data)
 }
@@ -254,16 +264,12 @@ func (s *oauth2ServiceMocked) ValidationBearerToken(r *http.Request) (oauth2.Tok
 	return s.validationBearerToken(r)
 }
 
-//
 // Mocking authService
-//
 func (ma mockAuthService) ValidatePasswordResetToken(ctx context.Context, token string) (*types.User, error) {
 	return &types.User{ID: 123}, nil
 }
 
-//
 // Mocking authService
-//
 func (ma mockAuthService) ValidatePasswordCreateToken(ctx context.Context, token string) (*types.User, error) {
 	return &types.User{ID: 123}, nil
 }
@@ -277,9 +283,7 @@ func (ma mockAuthService) ValidateTOTP(ctx context.Context, code string) (err er
 	return
 }
 
-//
 // Mocking notification service
-//
 func (m mockNotificationService) EmailConfirmation(ctx context.Context, emailAddress string, token string) error {
 	return nil
 }
@@ -296,9 +300,7 @@ func (m mockNotificationService) EmailOTP(ctx context.Context, emailAddress stri
 	return nil
 }
 
-//
 // Mocking gorilla session
-//
 func (ms mockSession) Get(r *http.Request, name string) (*sessions.Session, error) {
 	return ms.get(r, name)
 }
@@ -309,9 +311,7 @@ func (ms mockSession) Save(r *http.Request, w http.ResponseWriter, s *sessions.S
 	return ms.save(r, w, s)
 }
 
-//
 // Helpers
-//
 func makeMockAuthService() *mockAuthService {
 	service.DefaultAuthNotification = mockNotificationService{
 		settings: service.CurrentSettings,
diff --git a/server/auth/handlers/routes.go b/server/auth/handlers/routes.go
index 6523873ee..d36225bfe 100644
--- a/server/auth/handlers/routes.go
+++ b/server/auth/handlers/routes.go
@@ -100,6 +100,7 @@ func (h *AuthHandlers) MountHttpRoutes(r chi.Router) {
 			r.Post(tbp(l.OAuth2AuthorizeClient), h.handle(authOnly(h.oauth2AuthorizeClientProc)))
 			r.Get(tbp(l.OAuth2DefaultClient), h.handle(h.oauth2authorizeDefaultClient))
 			r.Post(tbp(l.OAuth2DefaultClient), h.handle(h.oauth2authorizeDefaultClientProc))
+			r.Get(tbp(l.OAuth2UserInfo), h.handle(h.oauth2authorizeDefaultClientProc))
 		})
 
 		// Wrapping SAML structs so we assure that fresh ones are always used in case
diff --git a/server/auth/settings/settings.go b/server/auth/settings/settings.go
index fa535f0a8..7fe086bac 100644
--- a/server/auth/settings/settings.go
+++ b/server/auth/settings/settings.go
@@ -13,6 +13,7 @@ type (
 		Saml                      SAML
 		MultiFactor               MultiFactor
 		BackgroundUI              BackgroundUI
+		ProfileAvatarEnabled      bool
 	}
 
 	SAML struct {
diff --git a/server/go.mod b/server/go.mod
index e818cbca4..9a25c7b4f 100644
--- a/server/go.mod
+++ b/server/go.mod
@@ -89,12 +89,14 @@ require (
 	github.com/crewjam/httperr v0.2.0 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.0-20210816181553-5444fa50b93d // indirect
 	github.com/dlclark/regexp2 v1.8.1 // indirect
+	github.com/fogleman/gg v1.3.0 // indirect
 	github.com/go-chi/chi v3.3.4+incompatible // indirect
 	github.com/go-sourcemap/sourcemap v2.1.3+incompatible // indirect
 	github.com/goccy/go-json v0.9.6 // indirect
 	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect
 	github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe // indirect
 	github.com/golang-sql/sqlexp v0.1.0 // indirect
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
 	github.com/google/pprof v0.0.0-20230228050547-1710fef4ab10 // indirect
 	github.com/gorilla/css v1.0.0 // indirect
 	github.com/gorilla/mux v1.8.0 // indirect
diff --git a/server/go.sum b/server/go.sum
index d75df95fc..ce41507f9 100644
--- a/server/go.sum
+++ b/server/go.sum
@@ -173,6 +173,8 @@ github.com/evanw/esbuild v0.14.38/go.mod h1:GG+zjdi59yh3ehDn4ZWfPcATxjPDUH53iU4Z
 github.com/fasthttp-contrib/websocket v0.0.0-20160511215533-1f3b11f56072/go.mod h1:duJ4Jxv5lDcvg4QuQr0oowTf7dz4/CR8NtyCooz9HL8=
 github.com/fatih/structs v1.1.0 h1:Q7juDM0QtcnhCpeyLGQKyg4TOIghuNXrkL32pHAUMxo=
 github.com/fatih/structs v1.1.0/go.mod h1:9NiDSp5zOcgEDl+j00MP/WkGVPOlPRLejGD8Ga6PJ7M=
+github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8=
+github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/fsnotify/fsnotify v1.5.3 h1:vNFpj2z7YIbwh2bw7x35sqYpp2wfuq+pivKbWG09B8c=
@@ -228,6 +230,8 @@ github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe h1:lXe2qZdvpiX5WZ
 github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe/go.mod h1:8vg3r2VgvsThLBIFL93Qb5yWzgyZWhEmBwUJWevAkK0=
 github.com/golang-sql/sqlexp v0.1.0 h1:ZCD6MBpcuOVfGVqsEmY5/4FtYiKz6tSyUv9LPEDei6A=
 github.com/golang-sql/sqlexp v0.1.0/go.mod h1:J4ad9Vo8ZCWQ2GMrC4UCQy1JpCbwU9m3EOqtpKwwwHI=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
diff --git a/server/pkg/options/helpers.go b/server/pkg/options/helpers.go
index 3e8afb300..4c28ee4a5 100644
--- a/server/pkg/options/helpers.go
+++ b/server/pkg/options/helpers.go
@@ -46,7 +46,7 @@ func fill(opt interface{}) {
 				continue
 			}
 
-			if f.Kind() == reflect.Int {
+			if f.Kind() == reflect.Int || f.Kind() == reflect.Int64 {
 				v.FieldByName(t.Name).SetInt(int64(EnvInt(tag, int(f.Int()))))
 				continue
 			}
diff --git a/server/pkg/options/options.gen.go b/server/pkg/options/options.gen.go
index adbcc21ea..4fe8c20fc 100644
--- a/server/pkg/options/options.gen.go
+++ b/server/pkg/options/options.gen.go
@@ -261,6 +261,13 @@ type (
 		CortezaDomain string `env:"DISCOVERY_CORTEZA_DOMAIN"`
 		BaseUrl       string `env:"DISCOVERY_BASE_URL"`
 	}
+
+	AttachmentOpt struct {
+		AvatarMaxFileSize             int64  `env:"ATTACHMENT_AVATAR_MAX_FILE_SIZE"`
+		AvatarInitialsFontPath        string `env:"AVATAR_INITIALS_FONT_PATH"`
+		AvatarInitialsBackgroundColor string `env:"AVATAR_INITIALS_BACKGROUND_COLOR"`
+		AvatarInitialsColor           string `env:"AVATAR_INITIALS_COLOR"`
+	}
 )
 
 // DB initializes and returns a DBOpt with default values
@@ -1063,3 +1070,33 @@ func Discovery() (o *DiscoveryOpt) {
 
 	return
 }
+
+// Attachment initializes and returns a AttachmentOpt with default values
+//
+// This function is auto-generated
+func Attachment() (o *AttachmentOpt) {
+	o = &AttachmentOpt{
+		AvatarMaxFileSize:             1000000,
+		AvatarInitialsFontPath:        "./auth/assets/public/fonts/poppins/Poppins-Regular.ttf",
+		AvatarInitialsBackgroundColor: "#F3F3F3",
+		AvatarInitialsColor:           "#162425",
+	}
+
+	// Custom defaults
+	func(o interface{}) {
+		if def, ok := o.(interface{ Defaults() }); ok {
+			def.Defaults()
+		}
+	}(o)
+
+	fill(o)
+
+	// Custom cleanup
+	func(o interface{}) {
+		if def, ok := o.(interface{ Cleanup() }); ok {
+			def.Cleanup()
+		}
+	}(o)
+
+	return
+}
diff --git a/server/pkg/options/options.go b/server/pkg/options/options.go
index 9a505c17d..ad62bba9c 100644
--- a/server/pkg/options/options.go
+++ b/server/pkg/options/options.go
@@ -28,6 +28,7 @@ type (
 		Limit       LimitOpt
 		Discovery   DiscoveryOpt
 		Apigw       ApigwOpt
+		Attachment  AttachmentOpt
 	}
 )
 
@@ -59,5 +60,6 @@ func Init() *Options {
 		Limit:       *Limit(),
 		Discovery:   *Discovery(),
 		Apigw:       *Apigw(),
+		Attachment:  *Attachment(),
 	}
 }
diff --git a/server/provision/001_settings/auth.yaml b/server/provision/001_settings/auth.yaml
index 988e0be40..92941a1c3 100644
--- a/server/provision/001_settings/auth.yaml
+++ b/server/provision/001_settings/auth.yaml
@@ -4,6 +4,7 @@ settings:
   auth.mail.from-name: Corteza
   auth.internal.enabled: true
   auth.internal.signup.enabled: true
+  auth.internal.profile-avatar.enabled: true
 
   # We add this through provision procedures
   # if we detect valid SMTP settings
diff --git a/server/system/rest.yaml b/server/system/rest.yaml
index 9fe061e87..da0487421 100644
--- a/server/system/rest.yaml
+++ b/server/system/rest.yaml
@@ -731,6 +731,59 @@ endpoints:
        - { type: uint64, name: userID,        required: true, title: ID }
        - { type: uint64, name: credentialsID, required: true, title: Credentials ID }
 
+  - name: profileAvatar
+    method: POST
+    title: User's profile avatar
+    path: "/{userID}/avatar"
+    parameters:
+      path:
+        - type: uint64
+          name: userID
+          required: true
+          title: User ID
+      post:
+        - name: upload
+          type: "*multipart.FileHeader"
+          title: Avatar to upload
+          required: false
+        - name: width
+          type: uint
+          title: Avatar width dimension
+          required: false
+        - name: height
+          type: uint
+          title: Avatar height dimension
+          required: false
+  - name: profileAvatarInitial
+    method: POST
+    title: User profile avatar initial
+    path: "/{userID}/avatar-initial"
+    parameters:
+      path:
+        - type: uint64
+          name: userID
+          required: true
+          title: User ID
+      post:
+        - name: avatarColor
+          type: string
+          title: Avatar text color
+          required: false
+        - name: avatarBgColor
+          type: string
+          title: Avatar initial background color
+          required: false
+  - name: deleteAvatar
+    method: DELETE
+    title: delete user's profile avatar
+    path: "/{userID}/avatar"
+    parameters:
+      path:
+        - type: uint64
+          name: userID
+          required: true
+          title: User ID
+
   - name: export
     method: GET
     title: Export users
diff --git a/server/system/rest/attachment.go b/server/system/rest/attachment.go
index 37568a054..234e36952 100644
--- a/server/system/rest/attachment.go
+++ b/server/system/rest/attachment.go
@@ -74,7 +74,7 @@ func (ctrl Attachment) Preview(ctx context.Context, r *request.AttachmentPreview
 }
 
 func (ctrl Attachment) isAccessible(kind string, attachmentID, userID uint64, signature string) error {
-	if kind == types.AttachmentKindSettings {
+	if kind == types.AttachmentKindSettings || kind == types.AttachmentKindAvatar {
 		// Attachments on settings are public
 		return nil
 	}
diff --git a/server/system/rest/handlers/user.go b/server/system/rest/handlers/user.go
index 63437bb7e..a798039ed 100644
--- a/server/system/rest/handlers/user.go
+++ b/server/system/rest/handlers/user.go
@@ -36,31 +36,37 @@ type (
 		SessionsRemove(context.Context, *request.UserSessionsRemove) (interface{}, error)
 		ListCredentials(context.Context, *request.UserListCredentials) (interface{}, error)
 		DeleteCredentials(context.Context, *request.UserDeleteCredentials) (interface{}, error)
+		ProfileAvatar(context.Context, *request.UserProfileAvatar) (interface{}, error)
+		ProfileAvatarInitial(context.Context, *request.UserProfileAvatarInitial) (interface{}, error)
+		DeleteAvatar(context.Context, *request.UserDeleteAvatar) (interface{}, error)
 		Export(context.Context, *request.UserExport) (interface{}, error)
 		Import(context.Context, *request.UserImport) (interface{}, error)
 	}
 
 	// HTTP API interface
 	User struct {
-		List              func(http.ResponseWriter, *http.Request)
-		Create            func(http.ResponseWriter, *http.Request)
-		Update            func(http.ResponseWriter, *http.Request)
-		PartialUpdate     func(http.ResponseWriter, *http.Request)
-		Read              func(http.ResponseWriter, *http.Request)
-		Delete            func(http.ResponseWriter, *http.Request)
-		Suspend           func(http.ResponseWriter, *http.Request)
-		Unsuspend         func(http.ResponseWriter, *http.Request)
-		Undelete          func(http.ResponseWriter, *http.Request)
-		SetPassword       func(http.ResponseWriter, *http.Request)
-		MembershipList    func(http.ResponseWriter, *http.Request)
-		MembershipAdd     func(http.ResponseWriter, *http.Request)
-		MembershipRemove  func(http.ResponseWriter, *http.Request)
-		TriggerScript     func(http.ResponseWriter, *http.Request)
-		SessionsRemove    func(http.ResponseWriter, *http.Request)
-		ListCredentials   func(http.ResponseWriter, *http.Request)
-		DeleteCredentials func(http.ResponseWriter, *http.Request)
-		Export            func(http.ResponseWriter, *http.Request)
-		Import            func(http.ResponseWriter, *http.Request)
+		List                 func(http.ResponseWriter, *http.Request)
+		Create               func(http.ResponseWriter, *http.Request)
+		Update               func(http.ResponseWriter, *http.Request)
+		PartialUpdate        func(http.ResponseWriter, *http.Request)
+		Read                 func(http.ResponseWriter, *http.Request)
+		Delete               func(http.ResponseWriter, *http.Request)
+		Suspend              func(http.ResponseWriter, *http.Request)
+		Unsuspend            func(http.ResponseWriter, *http.Request)
+		Undelete             func(http.ResponseWriter, *http.Request)
+		SetPassword          func(http.ResponseWriter, *http.Request)
+		MembershipList       func(http.ResponseWriter, *http.Request)
+		MembershipAdd        func(http.ResponseWriter, *http.Request)
+		MembershipRemove     func(http.ResponseWriter, *http.Request)
+		TriggerScript        func(http.ResponseWriter, *http.Request)
+		SessionsRemove       func(http.ResponseWriter, *http.Request)
+		ListCredentials      func(http.ResponseWriter, *http.Request)
+		DeleteCredentials    func(http.ResponseWriter, *http.Request)
+		ProfileAvatar        func(http.ResponseWriter, *http.Request)
+		ProfileAvatarInitial func(http.ResponseWriter, *http.Request)
+		DeleteAvatar         func(http.ResponseWriter, *http.Request)
+		Export               func(http.ResponseWriter, *http.Request)
+		Import               func(http.ResponseWriter, *http.Request)
 	}
 )
 
@@ -338,6 +344,54 @@ func NewUser(h UserAPI) *User {
 
 			api.Send(w, r, value)
 		},
+		ProfileAvatar: func(w http.ResponseWriter, r *http.Request) {
+			defer r.Body.Close()
+			params := request.NewUserProfileAvatar()
+			if err := params.Fill(r); err != nil {
+				api.Send(w, r, err)
+				return
+			}
+
+			value, err := h.ProfileAvatar(r.Context(), params)
+			if err != nil {
+				api.Send(w, r, err)
+				return
+			}
+
+			api.Send(w, r, value)
+		},
+		ProfileAvatarInitial: func(w http.ResponseWriter, r *http.Request) {
+			defer r.Body.Close()
+			params := request.NewUserProfileAvatarInitial()
+			if err := params.Fill(r); err != nil {
+				api.Send(w, r, err)
+				return
+			}
+
+			value, err := h.ProfileAvatarInitial(r.Context(), params)
+			if err != nil {
+				api.Send(w, r, err)
+				return
+			}
+
+			api.Send(w, r, value)
+		},
+		DeleteAvatar: func(w http.ResponseWriter, r *http.Request) {
+			defer r.Body.Close()
+			params := request.NewUserDeleteAvatar()
+			if err := params.Fill(r); err != nil {
+				api.Send(w, r, err)
+				return
+			}
+
+			value, err := h.DeleteAvatar(r.Context(), params)
+			if err != nil {
+				api.Send(w, r, err)
+				return
+			}
+
+			api.Send(w, r, value)
+		},
 		Export: func(w http.ResponseWriter, r *http.Request) {
 			defer r.Body.Close()
 			params := request.NewUserExport()
@@ -393,6 +447,9 @@ func (h User) MountRoutes(r chi.Router, middlewares ...func(http.Handler) http.H
 		r.Delete("/users/{userID}/sessions", h.SessionsRemove)
 		r.Get("/users/{userID}/credentials", h.ListCredentials)
 		r.Delete("/users/{userID}/credentials/{credentialsID}", h.DeleteCredentials)
+		r.Post("/users/{userID}/avatar", h.ProfileAvatar)
+		r.Post("/users/{userID}/avatar-initial", h.ProfileAvatarInitial)
+		r.Delete("/users/{userID}/avatar", h.DeleteAvatar)
 		r.Get("/users/export/{filename}.zip", h.Export)
 		r.Post("/users/import", h.Import)
 	})
diff --git a/server/system/rest/request/user.go b/server/system/rest/request/user.go
index 5759a8fa3..58831f92a 100644
--- a/server/system/rest/request/user.go
+++ b/server/system/rest/request/user.go
@@ -11,14 +11,15 @@ package request
 import (
 	"encoding/json"
 	"fmt"
-	"github.com/cortezaproject/corteza/server/pkg/label"
-	"github.com/cortezaproject/corteza/server/pkg/payload"
-	"github.com/cortezaproject/corteza/server/system/types"
-	"github.com/go-chi/chi/v5"
 	"io"
 	"mime/multipart"
 	"net/http"
 	"strings"
+
+	"github.com/cortezaproject/corteza/server/pkg/label"
+	"github.com/cortezaproject/corteza/server/pkg/payload"
+	"github.com/cortezaproject/corteza/server/system/types"
+	"github.com/go-chi/chi/v5"
 )
 
 // dummy vars to prevent
@@ -304,6 +305,52 @@ type (
 		CredentialsID uint64 `json:",string"`
 	}
 
+	UserProfileAvatar struct {
+		// UserID PATH parameter
+		//
+		// User ID
+		UserID uint64 `json:",string"`
+
+		// Upload POST parameter
+		//
+		// Avatar to upload
+		Upload *multipart.FileHeader
+
+		// Width POST parameter
+		//
+		// Avatar width dimension
+		Width uint
+
+		// Height POST parameter
+		//
+		// Avatar height dimension
+		Height uint
+	}
+
+	UserProfileAvatarInitial struct {
+		// UserID PATH parameter
+		//
+		// User ID
+		UserID uint64 `json:",string"`
+
+		// AvatarColor POST parameter
+		//
+		// Avatar text color
+		AvatarColor string
+
+		// AvatarBgColor POST parameter
+		//
+		// Avatar initial background color
+		AvatarBgColor string
+	}
+
+	UserDeleteAvatar struct {
+		// UserID PATH parameter
+		//
+		// User ID
+		UserID uint64 `json:",string"`
+	}
+
 	UserExport struct {
 		// Filename PATH parameter
 		//
@@ -1538,6 +1585,259 @@ func (r *UserDeleteCredentials) Fill(req *http.Request) (err error) {
 	return err
 }
 
+// NewUserProfileAvatar request
+func NewUserProfileAvatar() *UserProfileAvatar {
+	return &UserProfileAvatar{}
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserProfileAvatar) Auditable() map[string]interface{} {
+	return map[string]interface{}{
+		"userID": r.UserID,
+		"upload": r.Upload,
+		"width":  r.Width,
+		"height": r.Height,
+	}
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserProfileAvatar) GetUserID() uint64 {
+	return r.UserID
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserProfileAvatar) GetUpload() *multipart.FileHeader {
+	return r.Upload
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserProfileAvatar) GetWidth() uint {
+	return r.Width
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserProfileAvatar) GetHeight() uint {
+	return r.Height
+}
+
+// Fill processes request and fills internal variables
+func (r *UserProfileAvatar) Fill(req *http.Request) (err error) {
+
+	if strings.HasPrefix(strings.ToLower(req.Header.Get("content-type")), "application/json") {
+		err = json.NewDecoder(req.Body).Decode(r)
+
+		switch {
+		case err == io.EOF:
+			err = nil
+		case err != nil:
+			return fmt.Errorf("error parsing http request body: %w", err)
+		}
+	}
+
+	{
+		// Caching 32MB to memory, the rest to disk
+		if err = req.ParseMultipartForm(32 << 20); err != nil && err != http.ErrNotMultipart {
+			return err
+		} else if err == nil {
+			// Multipart params
+
+			// Ignoring upload as its handled in the POST params section
+
+			if val, ok := req.MultipartForm.Value["width"]; ok && len(val) > 0 {
+				r.Width, err = payload.ParseUint(val[0]), nil
+				if err != nil {
+					return err
+				}
+			}
+
+			if val, ok := req.MultipartForm.Value["height"]; ok && len(val) > 0 {
+				r.Height, err = payload.ParseUint(val[0]), nil
+				if err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	{
+		if err = req.ParseForm(); err != nil {
+			return err
+		}
+
+		// POST params
+
+		if _, r.Upload, err = req.FormFile("upload"); err != nil {
+			return fmt.Errorf("error processing uploaded file: %w", err)
+		}
+
+		if val, ok := req.Form["width"]; ok && len(val) > 0 {
+			r.Width, err = payload.ParseUint(val[0]), nil
+			if err != nil {
+				return err
+			}
+		}
+
+		if val, ok := req.Form["height"]; ok && len(val) > 0 {
+			r.Height, err = payload.ParseUint(val[0]), nil
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	{
+		var val string
+		// path params
+
+		val = chi.URLParam(req, "userID")
+		r.UserID, err = payload.ParseUint64(val), nil
+		if err != nil {
+			return err
+		}
+
+	}
+
+	return err
+}
+
+// NewUserProfileAvatarInitial request
+func NewUserProfileAvatarInitial() *UserProfileAvatarInitial {
+	return &UserProfileAvatarInitial{}
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserProfileAvatarInitial) Auditable() map[string]interface{} {
+	return map[string]interface{}{
+		"userID":        r.UserID,
+		"avatarColor":   r.AvatarColor,
+		"avatarBgColor": r.AvatarBgColor,
+	}
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserProfileAvatarInitial) GetUserID() uint64 {
+	return r.UserID
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserProfileAvatarInitial) GetAvatarColor() string {
+	return r.AvatarColor
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserProfileAvatarInitial) GetAvatarBgColor() string {
+	return r.AvatarBgColor
+}
+
+// Fill processes request and fills internal variables
+func (r *UserProfileAvatarInitial) Fill(req *http.Request) (err error) {
+
+	if strings.HasPrefix(strings.ToLower(req.Header.Get("content-type")), "application/json") {
+		err = json.NewDecoder(req.Body).Decode(r)
+
+		switch {
+		case err == io.EOF:
+			err = nil
+		case err != nil:
+			return fmt.Errorf("error parsing http request body: %w", err)
+		}
+	}
+
+	{
+		// Caching 32MB to memory, the rest to disk
+		if err = req.ParseMultipartForm(32 << 20); err != nil && err != http.ErrNotMultipart {
+			return err
+		} else if err == nil {
+			// Multipart params
+
+			if val, ok := req.MultipartForm.Value["avatarColor"]; ok && len(val) > 0 {
+				r.AvatarColor, err = val[0], nil
+				if err != nil {
+					return err
+				}
+			}
+
+			if val, ok := req.MultipartForm.Value["avatarBgColor"]; ok && len(val) > 0 {
+				r.AvatarBgColor, err = val[0], nil
+				if err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	{
+		if err = req.ParseForm(); err != nil {
+			return err
+		}
+
+		// POST params
+
+		if val, ok := req.Form["avatarColor"]; ok && len(val) > 0 {
+			r.AvatarColor, err = val[0], nil
+			if err != nil {
+				return err
+			}
+		}
+
+		if val, ok := req.Form["avatarBgColor"]; ok && len(val) > 0 {
+			r.AvatarBgColor, err = val[0], nil
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	{
+		var val string
+		// path params
+
+		val = chi.URLParam(req, "userID")
+		r.UserID, err = payload.ParseUint64(val), nil
+		if err != nil {
+			return err
+		}
+
+	}
+
+	return err
+}
+
+// NewUserDeleteAvatar request
+func NewUserDeleteAvatar() *UserDeleteAvatar {
+	return &UserDeleteAvatar{}
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserDeleteAvatar) Auditable() map[string]interface{} {
+	return map[string]interface{}{
+		"userID": r.UserID,
+	}
+}
+
+// Auditable returns all auditable/loggable parameters
+func (r UserDeleteAvatar) GetUserID() uint64 {
+	return r.UserID
+}
+
+// Fill processes request and fills internal variables
+func (r *UserDeleteAvatar) Fill(req *http.Request) (err error) {
+
+	{
+		var val string
+		// path params
+
+		val = chi.URLParam(req, "userID")
+		r.UserID, err = payload.ParseUint64(val), nil
+		if err != nil {
+			return err
+		}
+
+	}
+
+	return err
+}
+
 // NewUserExport request
 func NewUserExport() *UserExport {
 	return &UserExport{}
diff --git a/server/system/rest/user.go b/server/system/rest/user.go
index 33b1cdfc2..d51d1be6f 100644
--- a/server/system/rest/user.go
+++ b/server/system/rest/user.go
@@ -159,6 +159,18 @@ func (ctrl User) Update(ctx context.Context, r *request.UserUpdate) (interface{}
 	return ctrl.makePayload(ctx, res, err)
 }
 
+func (ctrl User) ProfileAvatar(ctx context.Context, r *request.UserProfileAvatar) (interface{}, error) {
+	return api.OK(), ctrl.user.UploadAvatar(ctx, r.UserID, r.Upload)
+}
+
+func (ctrl User) ProfileAvatarInitial(ctx context.Context, r *request.UserProfileAvatarInitial) (interface{}, error) {
+	return api.OK(), ctrl.user.GenerateAvatar(ctx, r.UserID, r.AvatarBgColor, r.AvatarColor)
+}
+
+func (ctrl User) DeleteAvatar(ctx context.Context, r *request.UserDeleteAvatar) (interface{}, error) {
+	return api.OK(), ctrl.user.DeleteAvatar(ctx, r.UserID)
+}
+
 type (
 	patchOp struct {
 		Operation string          `json:"op"`
diff --git a/server/system/service/attachment.go b/server/system/service/attachment.go
index b3a840a30..f46516dcb 100644
--- a/server/system/service/attachment.go
+++ b/server/system/service/attachment.go
@@ -4,25 +4,32 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"image"
-	"image/gif"
-	"io"
-	"net/http"
-	"path"
-	"strings"
-
 	"github.com/cortezaproject/corteza/server/pkg/actionlog"
 	intAuth "github.com/cortezaproject/corteza/server/pkg/auth"
 	files "github.com/cortezaproject/corteza/server/pkg/objstore"
+	"github.com/cortezaproject/corteza/server/pkg/options"
 	"github.com/cortezaproject/corteza/server/store"
 	"github.com/cortezaproject/corteza/server/system/types"
 	"github.com/disintegration/imaging"
 	"github.com/edwvee/exiffix"
+	"github.com/fogleman/gg"
+	"github.com/golang/freetype/truetype"
+	"golang.org/x/image/font"
+	"image"
+	"image/gif"
+	"io"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
 )
 
 const (
 	attachmentPreviewMaxWidth  = 320
 	attachmentPreviewMaxHeight = 180
+	avatarWidth                = 300
+	avatarHeight               = 300
 )
 
 type (
@@ -31,6 +38,7 @@ type (
 		files     files.Store
 		ac        attachmentAccessController
 		store     store.Storer
+		opt       options.AttachmentOpt
 	}
 
 	attachmentAccessController interface {
@@ -43,18 +51,21 @@ type (
 		Find(ctx context.Context, filter types.AttachmentFilter) (types.AttachmentSet, types.AttachmentFilter, error)
 		CreateSettingsAttachment(ctx context.Context, name string, size int64, fh io.ReadSeeker, labels map[string]string) (*types.Attachment, error)
 		CreateApplicationAttachment(ctx context.Context, name string, size int64, fh io.ReadSeeker, labels map[string]string) (*types.Attachment, error)
+		CreateAuthAttachment(ctx context.Context, name string, size int64, fh io.ReadSeeker, labels map[string]string) (*types.Attachment, error)
+		CreateAvatarInitialsAttachment(ctx context.Context, initials string, bgColor string, textColor string) (att *types.Attachment, err error)
 		OpenOriginal(att *types.Attachment) (io.ReadSeekCloser, error)
 		OpenPreview(att *types.Attachment) (io.ReadSeekCloser, error)
 		DeleteByID(ctx context.Context, ID uint64) error
 	}
 )
 
-func Attachment(store files.Store) *attachment {
+func Attachment(store files.Store, opt options.AttachmentOpt) *attachment {
 	return &attachment{
 		files:     store,
 		actionlog: DefaultActionlog,
 		ac:        DefaultAccessControl,
 		store:     DefaultStore,
+		opt:       opt,
 	}
 }
 
@@ -198,8 +209,135 @@ func (svc attachment) CreateApplicationAttachment(ctx context.Context, name stri
 	return att, svc.recordAction(ctx, aaProps, AttachmentActionCreate, err)
 }
 
+func (svc attachment) CreateAuthAttachment(ctx context.Context, name string, size int64, fh io.ReadSeeker, labels map[string]string) (att *types.Attachment, err error) {
+	var (
+		aaProps       = &attachmentActionProps{}
+		currentUserID = intAuth.GetIdentityFromContext(ctx).Identity()
+	)
+
+	// check the file type
+	ext := filepath.Ext(name)
+	if ext != ".jpg" && ext != ".jpeg" && ext != ".png" {
+		return nil, AttachmentErrInvalidAvatarFileType()
+	}
+
+	//check the file size
+	if size > svc.opt.AvatarMaxFileSize {
+		return nil, AttachmentErrInvalidAvatarFileSize()
+	}
+
+	err = func() (err error) {
+		att = &types.Attachment{
+			OwnerID: currentUserID,
+			Name:    strings.TrimSpace(name),
+			Kind:    types.AttachmentKindAvatar,
+		}
+
+		aaProps.setAttachment(att)
+
+		if labels != nil {
+			att.Meta.Labels = labels
+		}
+
+		if err = svc.create(ctx, name, size, fh, att); err != nil {
+			return err
+		}
+
+		return err
+	}()
+
+	return att, svc.recordAction(ctx, aaProps, AttachmentActionCreate, err)
+}
+
+func (svc attachment) CreateAvatarInitialsAttachment(ctx context.Context, initials string, bgColor string, textColor string) (att *types.Attachment, err error) {
+	var (
+		aaProps       = &attachmentActionProps{}
+		currentUserID = intAuth.GetIdentityFromContext(ctx).Identity()
+	)
+
+	if bgColor == "" {
+		bgColor = svc.opt.AvatarInitialsBackgroundColor
+	}
+
+	if textColor == "" {
+		textColor = svc.opt.AvatarInitialsColor
+	}
+
+	// Set initials image background color and
+	// draw the initials text in the center of the image
+	dc := gg.NewContext(avatarWidth, avatarHeight)
+	dc.SetHexColor(bgColor)
+	dc.Clear()
+
+	// Get the font face properties
+	fontBytes, err := os.ReadFile(svc.opt.AvatarInitialsFontPath)
+	if err != nil {
+		fmt.Println(err.Error())
+	}
+
+	f, _ := truetype.Parse(fontBytes)
+
+	face := truetype.NewFace(f, &truetype.Options{
+		Size:    120,
+		DPI:     72,
+		Hinting: font.HintingFull,
+	})
+
+	// set initials text color
+	dc.SetFontFace(face)
+	dc.SetHexColor(textColor)
+
+	textWidth, textHeight := dc.MeasureString(initials)
+	dc.DrawString(initials, (avatarWidth-textWidth)/2, (avatarHeight+textHeight)/2.2)
+
+	// Generate and save the initials image in PNG format
+	err = func() (err error) {
+		att = &types.Attachment{
+			OwnerID: currentUserID,
+			Name:    initials,
+			Kind:    types.AttachmentKindAvatarInitials,
+		}
+
+		att.ID = nextID()
+		att.CreatedAt = *now()
+		att.Meta.Original.Extension = "png"
+		att.Meta.Labels = map[string]string{"key": types.AttachmentKindAvatarInitials}
+
+		if att.Meta.Original.Image == nil {
+			att.Meta.Original.Image = &types.AttachmentImageMeta{}
+		}
+
+		att.Meta.Original.Image.Initial = initials
+		att.Meta.Original.Image.InitialColor = textColor
+		att.Meta.Original.Image.BackgroundColor = bgColor
+
+		att.Url = svc.files.Original(att.ID, att.Meta.Original.Extension)
+		aaProps.setUrl(att.Url)
+
+		aaProps.setAttachment(att)
+
+		var buf = &bytes.Buffer{}
+		if err = imaging.Encode(buf, dc.Image(), imaging.PNG); err != nil {
+			return err
+		}
+
+		if err = svc.files.Save(att.Url, buf); err != nil {
+			return AttachmentErrFailedToStoreFile(aaProps).Wrap(err)
+		}
+
+		if err = store.CreateAttachment(ctx, svc.store, att); err != nil {
+			return
+		}
+
+		return nil
+	}()
+
+	return att, nil
+}
+
 func (svc attachment) create(ctx context.Context, name string, size int64, fh io.ReadSeeker, att *types.Attachment) (err error) {
 	var (
+		avatar  image.Image
 		aaProps = &attachmentActionProps{}
 	)
 
@@ -228,6 +366,30 @@ func (svc attachment) create(ctx context.Context, name string, size int64, fh io
 	att.Url = svc.files.Original(att.ID, att.Meta.Original.Extension)
 	aaProps.setUrl(att.Url)
 
+	// process avatar
+	if att.Kind == types.AttachmentKindAvatar {
+		if avatar, err = imaging.Decode(fh); err != nil {
+			return fmt.Errorf("could not decode original avatar: %w", err)
+		}
+
+		avatar = imaging.Resize(avatar, avatarWidth, avatarHeight, imaging.Lanczos)
+
+		var buf = &bytes.Buffer{}
+		if err = imaging.Encode(buf, avatar, imaging.JPEG); err != nil {
+			return
+		}
+
+		if err = svc.files.Save(att.Url, buf); err != nil {
+			return AttachmentErrFailedToStoreFile(aaProps).Wrap(err)
+		}
+
+		if err = store.CreateAttachment(ctx, svc.store, att); err != nil {
+			return
+		}
+
+		return nil
+	}
+
 	if err = svc.files.Save(att.Url, fh); err != nil {
 		return AttachmentErrFailedToStoreFile(aaProps).Wrap(err)
 	}
diff --git a/server/system/service/attachment_actions.gen.go b/server/system/service/attachment_actions.gen.go
index afe42a9fd..36c511cea 100644
--- a/server/system/service/attachment_actions.gen.go
+++ b/server/system/service/attachment_actions.gen.go
@@ -57,7 +57,6 @@ var (
 // setSize updates attachmentActionProps's size
 //
 // This function is auto-generated.
-//
 func (p *attachmentActionProps) setSize(size int64) *attachmentActionProps {
 	p.size = size
 	return p
@@ -66,7 +65,6 @@ func (p *attachmentActionProps) setSize(size int64) *attachmentActionProps {
 // setName updates attachmentActionProps's name
 //
 // This function is auto-generated.
-//
 func (p *attachmentActionProps) setName(name string) *attachmentActionProps {
 	p.name = name
 	return p
@@ -75,7 +73,6 @@ func (p *attachmentActionProps) setName(name string) *attachmentActionProps {
 // setMimetype updates attachmentActionProps's mimetype
 //
 // This function is auto-generated.
-//
 func (p *attachmentActionProps) setMimetype(mimetype string) *attachmentActionProps {
 	p.mimetype = mimetype
 	return p
@@ -84,7 +81,6 @@ func (p *attachmentActionProps) setMimetype(mimetype string) *attachmentActionPr
 // setUrl updates attachmentActionProps's url
 //
 // This function is auto-generated.
-//
 func (p *attachmentActionProps) setUrl(url string) *attachmentActionProps {
 	p.url = url
 	return p
@@ -93,7 +89,6 @@ func (p *attachmentActionProps) setUrl(url string) *attachmentActionProps {
 // setAttachment updates attachmentActionProps's attachment
 //
 // This function is auto-generated.
-//
 func (p *attachmentActionProps) setAttachment(attachment *types.Attachment) *attachmentActionProps {
 	p.attachment = attachment
 	return p
@@ -102,7 +97,6 @@ func (p *attachmentActionProps) setAttachment(attachment *types.Attachment) *att
 // setFilter updates attachmentActionProps's filter
 //
 // This function is auto-generated.
-//
 func (p *attachmentActionProps) setFilter(filter *types.AttachmentFilter) *attachmentActionProps {
 	p.filter = filter
 	return p
@@ -111,7 +105,6 @@ func (p *attachmentActionProps) setFilter(filter *types.AttachmentFilter) *attac
 // Serialize converts attachmentActionProps to actionlog.Meta
 //
 // This function is auto-generated.
-//
 func (p attachmentActionProps) Serialize() actionlog.Meta {
 	var (
 		m = make(actionlog.Meta)
@@ -142,7 +135,6 @@ func (p attachmentActionProps) Serialize() actionlog.Meta {
 // tr translates string and replaces meta value placeholder with values
 //
 // This function is auto-generated.
-//
 func (p attachmentActionProps) Format(in string, err error) string {
 	var (
 		pairs = []string{"{{err}}"}
@@ -217,7 +209,6 @@ func (p attachmentActionProps) Format(in string, err error) string {
 // String returns loggable description as string
 //
 // This function is auto-generated.
-//
 func (a *attachmentAction) String() string {
 	var props = &attachmentActionProps{}
 
@@ -245,7 +236,6 @@ func (e *attachmentAction) ToAction() *actionlog.Action {
 // AttachmentActionSearch returns "system:attachment.search" action
 //
 // This function is auto-generated.
-//
 func AttachmentActionSearch(props ...*attachmentActionProps) *attachmentAction {
 	a := &attachmentAction{
 		timestamp: time.Now(),
@@ -265,7 +255,6 @@ func AttachmentActionSearch(props ...*attachmentActionProps) *attachmentAction {
 // AttachmentActionLookup returns "system:attachment.lookup" action
 //
 // This function is auto-generated.
-//
 func AttachmentActionLookup(props ...*attachmentActionProps) *attachmentAction {
 	a := &attachmentAction{
 		timestamp: time.Now(),
@@ -285,7 +274,6 @@ func AttachmentActionLookup(props ...*attachmentActionProps) *attachmentAction {
 // AttachmentActionCreate returns "system:attachment.create" action
 //
 // This function is auto-generated.
-//
 func AttachmentActionCreate(props ...*attachmentActionProps) *attachmentAction {
 	a := &attachmentAction{
 		timestamp: time.Now(),
@@ -305,7 +293,6 @@ func AttachmentActionCreate(props ...*attachmentActionProps) *attachmentAction {
 // AttachmentActionDelete returns "system:attachment.delete" action
 //
 // This function is auto-generated.
-//
 func AttachmentActionDelete(props ...*attachmentActionProps) *attachmentAction {
 	a := &attachmentAction{
 		timestamp: time.Now(),
@@ -328,9 +315,7 @@ func AttachmentActionDelete(props ...*attachmentActionProps) *attachmentAction {
 
 // AttachmentErrGeneric returns "system:attachment.generic" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func AttachmentErrGeneric(mm ...*attachmentActionProps) *errors.Error {
 	var p = &attachmentActionProps{}
 	if len(mm) > 0 {
@@ -364,9 +349,7 @@ func AttachmentErrGeneric(mm ...*attachmentActionProps) *errors.Error {
 
 // AttachmentErrNotFound returns "system:attachment.notFound" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func AttachmentErrNotFound(mm ...*attachmentActionProps) *errors.Error {
 	var p = &attachmentActionProps{}
 	if len(mm) > 0 {
@@ -398,9 +381,7 @@ func AttachmentErrNotFound(mm ...*attachmentActionProps) *errors.Error {
 
 // AttachmentErrInvalidID returns "system:attachment.invalidID" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func AttachmentErrInvalidID(mm ...*attachmentActionProps) *errors.Error {
 	var p = &attachmentActionProps{}
 	if len(mm) > 0 {
@@ -432,9 +413,7 @@ func AttachmentErrInvalidID(mm ...*attachmentActionProps) *errors.Error {
 
 // AttachmentErrNotAllowedToListAttachments returns "system:attachment.notAllowedToListAttachments" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func AttachmentErrNotAllowedToListAttachments(mm ...*attachmentActionProps) *errors.Error {
 	var p = &attachmentActionProps{}
 	if len(mm) > 0 {
@@ -468,9 +447,7 @@ func AttachmentErrNotAllowedToListAttachments(mm ...*attachmentActionProps) *err
 
 // AttachmentErrNotAllowedToCreate returns "system:attachment.notAllowedToCreate" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func AttachmentErrNotAllowedToCreate(mm ...*attachmentActionProps) *errors.Error {
 	var p = &attachmentActionProps{}
 	if len(mm) > 0 {
@@ -504,9 +481,7 @@ func AttachmentErrNotAllowedToCreate(mm ...*attachmentActionProps) *errors.Error
 
 // AttachmentErrNotAllowedToCreateEmptyAttachment returns "system:attachment.notAllowedToCreateEmptyAttachment" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func AttachmentErrNotAllowedToCreateEmptyAttachment(mm ...*attachmentActionProps) *errors.Error {
 	var p = &attachmentActionProps{}
 	if len(mm) > 0 {
@@ -540,9 +515,7 @@ func AttachmentErrNotAllowedToCreateEmptyAttachment(mm ...*attachmentActionProps
 
 // AttachmentErrFailedToExtractMimeType returns "system:attachment.failedToExtractMimeType" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func AttachmentErrFailedToExtractMimeType(mm ...*attachmentActionProps) *errors.Error {
 	var p = &attachmentActionProps{}
 	if len(mm) > 0 {
@@ -574,9 +547,7 @@ func AttachmentErrFailedToExtractMimeType(mm ...*attachmentActionProps) *errors.
 
 // AttachmentErrFailedToStoreFile returns "system:attachment.failedToStoreFile" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func AttachmentErrFailedToStoreFile(mm ...*attachmentActionProps) *errors.Error {
 	var p = &attachmentActionProps{}
 	if len(mm) > 0 {
@@ -608,9 +579,7 @@ func AttachmentErrFailedToStoreFile(mm ...*attachmentActionProps) *errors.Error
 
 // AttachmentErrFailedToProcessImage returns "system:attachment.failedToProcessImage" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func AttachmentErrFailedToProcessImage(mm ...*attachmentActionProps) *errors.Error {
 	var p = &attachmentActionProps{}
 	if len(mm) > 0 {
@@ -640,6 +609,102 @@ func AttachmentErrFailedToProcessImage(mm ...*attachmentActionProps) *errors.Err
 	return e
 }
 
+// AttachmentErrInvalidAvatarFileType returns "system:attachment.invalidAvatarFileType" as *errors.Error
+//
+// This function is auto-generated.
+func AttachmentErrInvalidAvatarFileType(mm ...*attachmentActionProps) *errors.Error {
+	var p = &attachmentActionProps{}
+	if len(mm) > 0 {
+		p = mm[0]
+	}
+
+	var e = errors.New(
+		errors.KindInternal,
+
+		p.Format("invalid file type only JPEG and PNG are allowed", nil),
+
+		errors.Meta("type", "invalidAvatarFileType"),
+		errors.Meta("resource", "system:attachment"),
+
+		errors.Meta(attachmentPropsMetaKey{}, p),
+
+		// translation namespace & key
+		errors.Meta(locale.ErrorMetaNamespace{}, "system"),
+		errors.Meta(locale.ErrorMetaKey{}, "attachment.errors.invalidAvatarFileType"),
+
+		errors.StackSkip(1),
+	)
+
+	if len(mm) > 0 {
+	}
+
+	return e
+}
+
+// AttachmentErrInvalidAvatarFileSize returns "system:attachment.invalidAvatarFileSize" as *errors.Error
+//
+// This function is auto-generated.
+func AttachmentErrInvalidAvatarFileSize(mm ...*attachmentActionProps) *errors.Error {
+	var p = &attachmentActionProps{}
+	if len(mm) > 0 {
+		p = mm[0]
+	}
+
+	var e = errors.New(
+		errors.KindInternal,
+
+		p.Format("file size is too large", nil),
+
+		errors.Meta("type", "invalidAvatarFileSize"),
+		errors.Meta("resource", "system:attachment"),
+
+		errors.Meta(attachmentPropsMetaKey{}, p),
+
+		// translation namespace & key
+		errors.Meta(locale.ErrorMetaNamespace{}, "system"),
+		errors.Meta(locale.ErrorMetaKey{}, "attachment.errors.invalidAvatarFileSize"),
+
+		errors.StackSkip(1),
+	)
+
+	if len(mm) > 0 {
+	}
+
+	return e
+}
+
+// AttachmentErrInvalidInitialsLength returns "system:attachment.invalidInitialsLength" as *errors.Error
+//
+// This function is auto-generated.
+func AttachmentErrInvalidInitialsLength(mm ...*attachmentActionProps) *errors.Error {
+	var p = &attachmentActionProps{}
+	if len(mm) > 0 {
+		p = mm[0]
+	}
+
+	var e = errors.New(
+		errors.KindInternal,
+
+		p.Format("initials characters length should not exceed 3 characters", nil),
+
+		errors.Meta("type", "invalidInitialsLength"),
+		errors.Meta("resource", "system:attachment"),
+
+		errors.Meta(attachmentPropsMetaKey{}, p),
+
+		// translation namespace & key
+		errors.Meta(locale.ErrorMetaNamespace{}, "system"),
+		errors.Meta(locale.ErrorMetaKey{}, "attachment.errors.invalidInitialsLength"),
+
+		errors.StackSkip(1),
+	)
+
+	if len(mm) > 0 {
+	}
+
+	return e
+}
+
 // *********************************************************************************************************************
 // *********************************************************************************************************************
 
@@ -648,7 +713,6 @@ func AttachmentErrFailedToProcessImage(mm ...*attachmentActionProps) *errors.Err
 // It will wrap unrecognized/internal errors with generic errors.
 //
 // This function is auto-generated.
-//
 func (svc attachment) recordAction(ctx context.Context, props *attachmentActionProps, actionFn func(...*attachmentActionProps) *attachmentAction, err error) error {
 	if svc.actionlog == nil || actionFn == nil {
 		// action log disabled or no action fn passed, return error as-is
diff --git a/server/system/service/attachment_actions.yaml b/server/system/service/attachment_actions.yaml
index 5f9ddb91a..a5cb227f3 100644
--- a/server/system/service/attachment_actions.yaml
+++ b/server/system/service/attachment_actions.yaml
@@ -69,3 +69,15 @@ errors:
 
   - error: failedToProcessImage
     message: "could not process image"
+
+  - error: invalidAvatarFileType
+    message: "invalid file type only JPEG and PNG are allowed"
+    severity: warning
+
+  - error: invalidAvatarFileSize
+    message: "file size is too large"
+    severity: warning
+
+  - error: invalidInitialsLength
+    message: "initials characters length should not exceed 3 characters"
+    severity: warning
diff --git a/server/system/service/service.go b/server/system/service/service.go
index 588af530f..6db64bdda 100644
--- a/server/system/service/service.go
+++ b/server/system/service/service.go
@@ -32,14 +32,15 @@ type (
 	}
 
 	Config struct {
-		ActionLog options.ActionLogOpt
-		Discovery options.DiscoveryOpt
-		Storage   options.ObjectStoreOpt
-		DB        options.DBOpt
-		Template  options.TemplateOpt
-		Auth      options.AuthOpt
-		RBAC      options.RbacOpt
-		Limit     options.LimitOpt
+		ActionLog  options.ActionLogOpt
+		Discovery  options.DiscoveryOpt
+		Storage    options.ObjectStoreOpt
+		DB         options.DBOpt
+		Template   options.TemplateOpt
+		Auth       options.AuthOpt
+		RBAC       options.RbacOpt
+		Limit      options.LimitOpt
+		Attachment options.AttachmentOpt
 	}
 
 	eventDispatcher interface {
@@ -204,6 +205,7 @@ func Initialize(ctx context.Context, log *zap.Logger, s store.Storer, ws websock
 	DefaultAuthNotification = AuthNotification(CurrentSettings, DefaultRenderer, c.Auth)
 	DefaultAuth = Auth(AuthOptions{LimitUsers: c.Limit.SystemUsers})
 	DefaultAuthClient = AuthClient(DefaultStore, DefaultAccessControl, DefaultActionlog, eventbus.Service(), c.Auth)
+	DefaultAttachment = Attachment(DefaultObjectStore, c.Attachment)
 	DefaultUser = User(UserOptions{LimitUsers: c.Limit.SystemUsers})
 	DefaultCredentials = Credentials()
 	DefaultReport = Report(DefaultStore, DefaultAccessControl, DefaultActionlog, eventbus.Service())
@@ -212,7 +214,6 @@ func Initialize(ctx context.Context, log *zap.Logger, s store.Storer, ws websock
 	DefaultReminder = Reminder(ctx, DefaultLogger.Named("reminder"), ws)
 	DefaultSink = Sink()
 	DefaultStatistics = Statistics()
-	DefaultAttachment = Attachment(DefaultObjectStore)
 	DefaultQueue = Queue()
 	DefaultApigwRoute = Route()
 	DefaultApigwProfiler = Profiler()
diff --git a/server/system/service/user.go b/server/system/service/user.go
index d1af268b4..f52422d18 100644
--- a/server/system/service/user.go
+++ b/server/system/service/user.go
@@ -2,13 +2,6 @@ package service
 
 import (
 	"context"
-	"io"
-	"net/mail"
-	"regexp"
-	"strconv"
-	"strings"
-	"time"
-
 	"github.com/cortezaproject/corteza/server/pkg/actionlog"
 	internalAuth "github.com/cortezaproject/corteza/server/pkg/auth"
 	"github.com/cortezaproject/corteza/server/pkg/errors"
@@ -19,6 +12,14 @@ import (
 	"github.com/cortezaproject/corteza/server/store"
 	"github.com/cortezaproject/corteza/server/system/service/event"
 	"github.com/cortezaproject/corteza/server/system/types"
+	"io"
+	"mime/multipart"
+	"net/mail"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+	"unicode"
 )
 
 const (
@@ -45,6 +46,8 @@ type (
 		//
 		// It also does negative caching by assigning empty User structs
 		preloaded map[string]*types.User
+
+		att AttachmentService
 	}
 
 	synteticUserDataGen interface {
@@ -99,6 +102,10 @@ type (
 
 		DeleteAuthTokensByUserID(ctx context.Context, userID uint64) (err error)
 		DeleteAuthSessionsByUserID(ctx context.Context, userID uint64) (err error)
+
+		UploadAvatar(ctx context.Context, userID uint64, Upload *multipart.FileHeader) (err error)
+		GenerateAvatar(ctx context.Context, userID uint64, bgColor string, initialColor string) (err error)
+		DeleteAvatar(ctx context.Context, id uint64) error
 	}
 )
 
@@ -116,6 +123,7 @@ func User(opt UserOptions) *user {
 		opt: opt,
 
 		preloaded: make(map[string]*types.User),
+		att:       DefaultAttachment,
 	}
 }
 
@@ -132,6 +140,14 @@ func (svc user) FindByID(ctx context.Context, userID uint64) (u *types.User, err
 
 		uaProps.setUser(u)
 
+		// If profile avatar settings is enabled and a user doesn't have an avatar image,
+		// generate one automatically when fetching their user information.
+		if svc.settings.Auth.Internal.ProfileAvatar.Enabled && u.Meta.AvatarID == 0 && u.Meta.AvatarColor == "" {
+			if err = svc.generateUserAvatarInitial(ctx, u); err != nil {
+				return err
+			}
+		}
+
 		if !svc.ac.CanReadUser(ctx, u) {
 			return UserErrNotAllowedToRead()
 		}
@@ -369,6 +385,11 @@ func (svc user) Create(ctx context.Context, new *types.User) (u *types.User, err
 			return
 		}
 
+		// Process avatar initials Image
+		if err = svc.generateUserAvatarInitial(ctx, new); err != nil {
+			return
+		}
+
 		new.ID = nextID()
 		new.CreatedAt = *now()
 
@@ -410,7 +431,7 @@ func (svc user) Update(ctx context.Context, upd *types.User) (u *types.User, err
 			return UserErrInvalidEmail()
 		}
 
-		if u, err = loadUser(ctx, svc.store, upd.ID); err != nil {
+		if u, err = svc.FindByID(ctx, upd.ID); err != nil {
 			return
 		}
 
@@ -439,6 +460,10 @@ func (svc user) Update(ctx context.Context, upd *types.User) (u *types.User, err
 			u.Meta = upd.Meta
 		}
 
+		if err = svc.generateUserAvatarInitial(ctx, u); err != nil {
+			return err
+		}
+
 		if err = svc.eventbus.WaitFor(ctx, event.UserBeforeUpdate(upd, u)); err != nil {
 			return
 		}
@@ -1035,3 +1060,246 @@ func toLabeledUsers(set []*types.User) []label.LabeledResource {
 
 	return ll
 }
+
+func (svc user) UploadAvatar(ctx context.Context, userID uint64, upload *multipart.FileHeader) (err error) {
+	var (
+		u       *types.User
+		att     *types.Attachment
+		uaProps = &userActionProps{user: &types.User{ID: userID}}
+	)
+
+	err = func() (err error) {
+		if u, err = loadUser(ctx, svc.store, userID); err != nil {
+			return
+		}
+
+		if u.Meta.AvatarID != 0 {
+			if err = svc.att.DeleteByID(ctx, u.Meta.AvatarID); err != nil {
+				return
+			}
+		}
+
+		file, err := upload.Open()
+		if err != nil {
+			return err
+		}
+
+		defer file.Close()
+
+		att, err = svc.att.CreateAuthAttachment(
+			ctx,
+			upload.Filename,
+			upload.Size,
+			file,
+			map[string]string{"key": types.AttachmentKindAvatar},
+		)
+
+		if err != nil {
+			return err
+		}
+
+		u.Meta.AvatarID = att.ID
+		u.Meta.AvatarKind = types.AttachmentKindAvatar
+
+		if err = store.UpdateUser(ctx, svc.store, u); err != nil {
+			return
+		}
+
+		return nil
+	}()
+
+	return svc.recordAction(ctx, uaProps, UserActionUploadAvatar, err)
+}
+
+// DeleteAvatar will delete user's avatar
+func (svc user) DeleteAvatar(ctx context.Context, userID uint64) (err error) {
+	var (
+		u       *types.User
+		uaProps = &userActionProps{user: &types.User{ID: userID}}
+	)
+
+	err = func() (err error) {
+		if u, err = svc.FindByID(ctx, userID); err != nil {
+			return
+		}
+
+		if u.Kind == types.SystemUser {
+			return UserErrNotAllowedToDeleteAvatar()
+		}
+
+		att, err := svc.att.FindByID(ctx, u.Meta.AvatarID)
+		if err != nil {
+			return err
+		}
+
+		if att.Meta.Labels["key"] != types.AttachmentKindAvatar {
+			return nil
+		}
+
+		if !svc.ac.CanUpdateUser(ctx, u) {
+			return UserErrNotAllowedToDeleteAvatar()
+		}
+
+		if err = svc.att.DeleteByID(ctx, u.Meta.AvatarID); err != nil {
+			return err
+		}
+
+		u.Meta.AvatarID = 0
+
+		// When an uploaded avatar is deleted, generate avatar initial
+		if err = svc.generateUserAvatarInitial(ctx, u); err != nil {
+			return err
+		}
+
+		if err = store.UpdateUser(ctx, svc.store, u); err != nil {
+			return
+		}
+
+		return nil
+	}()
+
+	return svc.recordAction(ctx, uaProps, UserActionDeleteAvatar, err)
+}
+
+func processAvatarInitials(u *types.User) (initial string) {
+	var (
+		chars string
+		parts []string
+	)
+
+	if u.Name != "" {
+		parts = strings.Fields(u.Name)
+		if len(parts) > 2 {
+			chars = string(parts[0][0]) + string(parts[1][0]) + string(parts[2][0])
+		} else if len(parts) > 1 {
+			chars = string(parts[0][0]) + string(parts[1][0])
+		} else {
+			if len(parts[0]) > 1 {
+				chars = string(parts[0][0]) + string(parts[0][1])
+			} else {
+				chars = string(parts[0][0])
+			}
+		}
+	} else if u.Handle != "" {
+		if strings.ContainsAny(u.Handle, "._-") {
+			for _, del := range "._-" {
+				if strings.Contains(u.Handle, string(del)) {
+					parts = strings.Split(u.Handle, string(del))
+					break
+				}
+			}
+
+			chars = string(parts[0][0]) + string(parts[1][0])
+		} else {
+			chars = string(u.Handle[0])
+		}
+	} else {
+		email := strings.Split(u.Email, "@")
+		if strings.ContainsAny(email[0], "._-") {
+			for _, del := range "._-" {
+				if strings.Contains(email[0], string(del)) {
+					parts = strings.Split(email[0], string(del))
+					break
+				}
+			}
+
+			chars = string(parts[0][0]) + string(parts[1][0])
+		} else {
+			chars = string(email[0][0])
+		}
+	}
+
+	// Validate initials: if initials are letters if not assign a default "CU"
+	for _, c := range chars {
+		if unicode.IsLetter(c) {
+			initial += string(c)
+		}
+		continue
+	}
+	if initial == "" {
+		initial = "CU"
+	}
+
+	initial = strings.ToUpper(initial)
+
+	return
+}
+
+func (svc user) GenerateAvatar(ctx context.Context, userID uint64, bgColor string, initialColor string) (err error) {
+	var (
+		u       *types.User
+		uaProps = &userActionProps{user: &types.User{ID: userID}}
+	)
+
+	err = func() (err error) {
+		if u, err = loadUser(ctx, svc.store, userID); err != nil {
+			return
+		}
+
+		u.Meta.AvatarColor = initialColor
+		u.Meta.AvatarBgColor = bgColor
+		if err = svc.generateUserAvatarInitial(ctx, u); err != nil {
+			return err
+		}
+
+		if err = store.UpdateUser(ctx, svc.store, u); err != nil {
+			return
+		}
+
+		return nil
+	}()
+
+	return svc.recordAction(ctx, uaProps, UserActionGenerateAvatar, err)
+}
+
+func (svc user) generateUserAvatarInitial(ctx context.Context, u *types.User) (err error) {
+	var (
+		att *types.Attachment
+	)
+
+	initial := processAvatarInitials(u)
+
+	if u.Meta == nil {
+		u.Meta = &types.UserMeta{}
+	}
+
+	if u.Meta.AvatarID != 0 {
+		if att, err = svc.att.FindByID(ctx, u.Meta.AvatarID); err != nil {
+			return err
+		}
+
+		if att.Meta.Labels["key"] == types.AttachmentKindAvatar {
+			return nil
+		}
+
+		colorLogic := att.Meta.Original.Image.BackgroundColor == u.Meta.AvatarBgColor && att.Meta.Original.Image.InitialColor == u.Meta.AvatarColor
+		if att.Meta.Original.Image.Initial == initial && colorLogic {
+			return nil
+		}
+
+		if err = svc.att.DeleteByID(ctx, att.ID); err != nil {
+			return err
+		}
+	}
+
+	if att, err = svc.att.CreateAvatarInitialsAttachment(ctx, initial, u.Meta.AvatarBgColor, u.Meta.AvatarColor); err != nil {
+		return err
+	}
+
+	if u.Meta == nil {
+		u.Meta = &types.UserMeta{}
+	}
+
+	u.Meta.AvatarID = att.ID
+	u.Meta.AvatarKind = types.AttachmentKindAvatarInitials
+
+	if u.Meta.AvatarBgColor == "" {
+		u.Meta.AvatarBgColor = att.Meta.Original.Image.BackgroundColor
+	}
+
+	if u.Meta.AvatarColor == "" {
+		u.Meta.AvatarColor = att.Meta.Original.Image.InitialColor
+	}
+
+	return nil
+}
diff --git a/server/system/service/user_actions.gen.go b/server/system/service/user_actions.gen.go
index e55d7d018..800eaa57f 100644
--- a/server/system/service/user_actions.gen.go
+++ b/server/system/service/user_actions.gen.go
@@ -56,7 +56,6 @@ var (
 // setUser updates userActionProps's user
 //
 // This function is auto-generated.
-//
 func (p *userActionProps) setUser(user *types.User) *userActionProps {
 	p.user = user
 	return p
@@ -65,7 +64,6 @@ func (p *userActionProps) setUser(user *types.User) *userActionProps {
 // setNew updates userActionProps's new
 //
 // This function is auto-generated.
-//
 func (p *userActionProps) setNew(new *types.User) *userActionProps {
 	p.new = new
 	return p
@@ -74,7 +72,6 @@ func (p *userActionProps) setNew(new *types.User) *userActionProps {
 // setUpdate updates userActionProps's update
 //
 // This function is auto-generated.
-//
 func (p *userActionProps) setUpdate(update *types.User) *userActionProps {
 	p.update = update
 	return p
@@ -83,7 +80,6 @@ func (p *userActionProps) setUpdate(update *types.User) *userActionProps {
 // setExisting updates userActionProps's existing
 //
 // This function is auto-generated.
-//
 func (p *userActionProps) setExisting(existing *types.User) *userActionProps {
 	p.existing = existing
 	return p
@@ -92,7 +88,6 @@ func (p *userActionProps) setExisting(existing *types.User) *userActionProps {
 // setFilter updates userActionProps's filter
 //
 // This function is auto-generated.
-//
 func (p *userActionProps) setFilter(filter *types.UserFilter) *userActionProps {
 	p.filter = filter
 	return p
@@ -101,7 +96,6 @@ func (p *userActionProps) setFilter(filter *types.UserFilter) *userActionProps {
 // Serialize converts userActionProps to actionlog.Meta
 //
 // This function is auto-generated.
-//
 func (p userActionProps) Serialize() actionlog.Meta {
 	var (
 		m = make(actionlog.Meta)
@@ -153,7 +147,6 @@ func (p userActionProps) Serialize() actionlog.Meta {
 // tr translates string and replaces meta value placeholder with values
 //
 // This function is auto-generated.
-//
 func (p userActionProps) Format(in string, err error) string {
 	var (
 		pairs = []string{"{{err}}"}
@@ -292,7 +285,6 @@ func (p userActionProps) Format(in string, err error) string {
 // String returns loggable description as string
 //
 // This function is auto-generated.
-//
 func (a *userAction) String() string {
 	var props = &userActionProps{}
 
@@ -320,7 +312,6 @@ func (e *userAction) ToAction() *actionlog.Action {
 // UserActionSearch returns "system:user.search" action
 //
 // This function is auto-generated.
-//
 func UserActionSearch(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -340,7 +331,6 @@ func UserActionSearch(props ...*userActionProps) *userAction {
 // UserActionLookup returns "system:user.lookup" action
 //
 // This function is auto-generated.
-//
 func UserActionLookup(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -360,7 +350,6 @@ func UserActionLookup(props ...*userActionProps) *userAction {
 // UserActionCreate returns "system:user.create" action
 //
 // This function is auto-generated.
-//
 func UserActionCreate(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -380,7 +369,6 @@ func UserActionCreate(props ...*userActionProps) *userAction {
 // UserActionUpdate returns "system:user.update" action
 //
 // This function is auto-generated.
-//
 func UserActionUpdate(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -400,7 +388,6 @@ func UserActionUpdate(props ...*userActionProps) *userAction {
 // UserActionDelete returns "system:user.delete" action
 //
 // This function is auto-generated.
-//
 func UserActionDelete(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -420,7 +407,6 @@ func UserActionDelete(props ...*userActionProps) *userAction {
 // UserActionUndelete returns "system:user.undelete" action
 //
 // This function is auto-generated.
-//
 func UserActionUndelete(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -440,7 +426,6 @@ func UserActionUndelete(props ...*userActionProps) *userAction {
 // UserActionSuspend returns "system:user.suspend" action
 //
 // This function is auto-generated.
-//
 func UserActionSuspend(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -460,7 +445,6 @@ func UserActionSuspend(props ...*userActionProps) *userAction {
 // UserActionUnsuspend returns "system:user.unsuspend" action
 //
 // This function is auto-generated.
-//
 func UserActionUnsuspend(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -480,7 +464,6 @@ func UserActionUnsuspend(props ...*userActionProps) *userAction {
 // UserActionSetPassword returns "system:user.setPassword" action
 //
 // This function is auto-generated.
-//
 func UserActionSetPassword(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -500,7 +483,6 @@ func UserActionSetPassword(props ...*userActionProps) *userAction {
 // UserActionRemovePassword returns "system:user.removePassword" action
 //
 // This function is auto-generated.
-//
 func UserActionRemovePassword(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -520,7 +502,6 @@ func UserActionRemovePassword(props ...*userActionProps) *userAction {
 // UserActionDeleteAuthTokens returns "system:user.deleteAuthTokens" action
 //
 // This function is auto-generated.
-//
 func UserActionDeleteAuthTokens(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -540,7 +521,6 @@ func UserActionDeleteAuthTokens(props ...*userActionProps) *userAction {
 // UserActionDeleteAuthSessions returns "system:user.deleteAuthSessions" action
 //
 // This function is auto-generated.
-//
 func UserActionDeleteAuthSessions(props ...*userActionProps) *userAction {
 	a := &userAction{
 		timestamp: time.Now(),
@@ -557,15 +537,70 @@ func UserActionDeleteAuthSessions(props ...*userActionProps) *userAction {
 	return a
 }
 
+// UserActionUploadAvatar returns "system:user.uploadAvatar" action
+//
+// This function is auto-generated.
+func UserActionUploadAvatar(props ...*userActionProps) *userAction {
+	a := &userAction{
+		timestamp: time.Now(),
+		resource:  "system:user",
+		action:    "uploadAvatar",
+		log:       "uploaded avatar of {{user}}",
+		severity:  actionlog.Notice,
+	}
+
+	if len(props) > 0 {
+		a.props = props[0]
+	}
+
+	return a
+}
+
+// UserActionGenerateAvatar returns "system:user.generateAvatar" action
+//
+// This function is auto-generated.
+func UserActionGenerateAvatar(props ...*userActionProps) *userAction {
+	a := &userAction{
+		timestamp: time.Now(),
+		resource:  "system:user",
+		action:    "generateAvatar",
+		log:       "generated avatar of {{user}}",
+		severity:  actionlog.Notice,
+	}
+
+	if len(props) > 0 {
+		a.props = props[0]
+	}
+
+	return a
+}
+
+// UserActionDeleteAvatar returns "system:user.deleteAvatar" action
+//
+// This function is auto-generated.
+func UserActionDeleteAvatar(props ...*userActionProps) *userAction {
+	a := &userAction{
+		timestamp: time.Now(),
+		resource:  "system:user",
+		action:    "deleteAvatar",
+		log:       "deleted avatar of {{user}}",
+		severity:  actionlog.Notice,
+	}
+
+	if len(props) > 0 {
+		a.props = props[0]
+	}
+
+	return a
+}
+
 // *********************************************************************************************************************
 // *********************************************************************************************************************
 // Error constructors
 
 // UserErrGeneric returns "system:user.generic" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrGeneric(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -599,9 +634,7 @@ func UserErrGeneric(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotFound returns "system:user.notFound" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotFound(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -633,9 +666,7 @@ func UserErrNotFound(mm ...*userActionProps) *errors.Error {
 
 // UserErrInvalidID returns "system:user.invalidID" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrInvalidID(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -667,9 +698,7 @@ func UserErrInvalidID(mm ...*userActionProps) *errors.Error {
 
 // UserErrInvalidHandle returns "system:user.invalidHandle" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrInvalidHandle(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -701,9 +730,7 @@ func UserErrInvalidHandle(mm ...*userActionProps) *errors.Error {
 
 // UserErrInvalidEmail returns "system:user.invalidEmail" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrInvalidEmail(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -735,9 +762,7 @@ func UserErrInvalidEmail(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToRead returns "system:user.notAllowedToRead" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToRead(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -771,9 +796,7 @@ func UserErrNotAllowedToRead(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToSearch returns "system:user.notAllowedToSearch" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToSearch(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -807,9 +830,7 @@ func UserErrNotAllowedToSearch(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToListUsers returns "system:user.notAllowedToListUsers" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToListUsers(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -843,9 +864,7 @@ func UserErrNotAllowedToListUsers(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToCreate returns "system:user.notAllowedToCreate" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToCreate(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -879,9 +898,7 @@ func UserErrNotAllowedToCreate(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToCreateSystem returns "system:user.notAllowedToCreateSystem" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToCreateSystem(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -915,9 +932,7 @@ func UserErrNotAllowedToCreateSystem(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToUpdate returns "system:user.notAllowedToUpdate" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToUpdate(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -951,9 +966,7 @@ func UserErrNotAllowedToUpdate(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToUpdateSystem returns "system:user.notAllowedToUpdateSystem" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToUpdateSystem(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -987,9 +1000,7 @@ func UserErrNotAllowedToUpdateSystem(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToDelete returns "system:user.notAllowedToDelete" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToDelete(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -1023,9 +1034,7 @@ func UserErrNotAllowedToDelete(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToUndelete returns "system:user.notAllowedToUndelete" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToUndelete(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -1059,9 +1068,7 @@ func UserErrNotAllowedToUndelete(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToSuspend returns "system:user.notAllowedToSuspend" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToSuspend(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -1095,9 +1102,7 @@ func UserErrNotAllowedToSuspend(mm ...*userActionProps) *errors.Error {
 
 // UserErrNotAllowedToUnsuspend returns "system:user.notAllowedToUnsuspend" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrNotAllowedToUnsuspend(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -1131,9 +1136,7 @@ func UserErrNotAllowedToUnsuspend(mm ...*userActionProps) *errors.Error {
 
 // UserErrHandleNotUnique returns "system:user.handleNotUnique" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrHandleNotUnique(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -1167,9 +1170,7 @@ func UserErrHandleNotUnique(mm ...*userActionProps) *errors.Error {
 
 // UserErrEmailNotUnique returns "system:user.emailNotUnique" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrEmailNotUnique(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -1203,9 +1204,7 @@ func UserErrEmailNotUnique(mm ...*userActionProps) *errors.Error {
 
 // UserErrUsernameNotUnique returns "system:user.usernameNotUnique" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrUsernameNotUnique(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -1239,9 +1238,7 @@ func UserErrUsernameNotUnique(mm ...*userActionProps) *errors.Error {
 
 // UserErrPasswordNotSecure returns "system:user.passwordNotSecure" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrPasswordNotSecure(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -1273,9 +1270,7 @@ func UserErrPasswordNotSecure(mm ...*userActionProps) *errors.Error {
 
 // UserErrMaxUserLimitReached returns "system:user.maxUserLimitReached" as *errors.Error
 //
-//
 // This function is auto-generated.
-//
 func UserErrMaxUserLimitReached(mm ...*userActionProps) *errors.Error {
 	var p = &userActionProps{}
 	if len(mm) > 0 {
@@ -1305,6 +1300,40 @@ func UserErrMaxUserLimitReached(mm ...*userActionProps) *errors.Error {
 	return e
 }
 
+// UserErrNotAllowedToDeleteAvatar returns "system:user.notAllowedToDeleteAvatar" as *errors.Error
+//
+// This function is auto-generated.
+func UserErrNotAllowedToDeleteAvatar(mm ...*userActionProps) *errors.Error {
+	var p = &userActionProps{}
+	if len(mm) > 0 {
+		p = mm[0]
+	}
+
+	var e = errors.New(
+		errors.KindInternal,
+
+		p.Format("not allowed to delete avatar for this user", nil),
+
+		errors.Meta("type", "notAllowedToDeleteAvatar"),
+		errors.Meta("resource", "system:user"),
+
+		// action log entry; no formatting, it will be applied inside recordAction fn.
+		errors.Meta(userLogMetaKey{}, "failed to delete {{user.handle}}'s avatar; insufficient permissions"),
+		errors.Meta(userPropsMetaKey{}, p),
+
+		// translation namespace & key
+		errors.Meta(locale.ErrorMetaNamespace{}, "system"),
+		errors.Meta(locale.ErrorMetaKey{}, "user.errors.notAllowedToDeleteAvatar"),
+
+		errors.StackSkip(1),
+	)
+
+	if len(mm) > 0 {
+	}
+
+	return e
+}
+
 // *********************************************************************************************************************
 // *********************************************************************************************************************
 
@@ -1313,7 +1342,6 @@ func UserErrMaxUserLimitReached(mm ...*userActionProps) *errors.Error {
 // It will wrap unrecognized/internal errors with generic errors.
 //
 // This function is auto-generated.
-//
 func (svc user) recordAction(ctx context.Context, props *userActionProps, actionFn func(...*userActionProps) *userAction, err error) error {
 	if svc.actionlog == nil || actionFn == nil {
 		// action log disabled or no action fn passed, return error as-is
diff --git a/server/system/service/user_actions.yaml b/server/system/service/user_actions.yaml
index b84d23087..19db999af 100644
--- a/server/system/service/user_actions.yaml
+++ b/server/system/service/user_actions.yaml
@@ -68,6 +68,15 @@ actions:
   - action: deleteAuthSessions
     log: "deleted auth sessions of {{user}}"
 
+  - action: uploadAvatar
+    log: "uploaded avatar of {{user}}"
+
+  - action: generateAvatar
+    log: "generated avatar of {{user}}"
+
+  - action: deleteAvatar
+    log: "deleted avatar of {{user}}"
+
 errors:
   - error: notFound
     message: "user not found"
@@ -150,3 +159,7 @@ errors:
   - error: maxUserLimitReached
     message: "you have reached your user limit, contact your Corteza  administrator"
     severity: warning
+
+  - error: notAllowedToDeleteAvatar
+    message: "not allowed to delete avatar for this user"
+    log: "failed to delete {{user.handle}}'s avatar; insufficient permissions"
diff --git a/server/system/service/user_test.go b/server/system/service/user_test.go
index 88ac2a76c..dae234fb3 100644
--- a/server/system/service/user_test.go
+++ b/server/system/service/user_test.go
@@ -2,6 +2,7 @@ package service
 
 import (
 	"context"
+	"github.com/stretchr/testify/assert"
 	"testing"
 
 	a "github.com/cortezaproject/corteza/server/pkg/auth"
@@ -93,3 +94,84 @@ func TestUser_ProtectedSearch(t *testing.T) {
 		req.Len(set, 0)
 	})
 }
+
+func Test_processAvatarInitials(t *testing.T) {
+	// Define test cases
+	tests := []struct {
+		name            string
+		user            *types.User
+		expectedInitial string
+	}{
+		{
+			name: "Test with valid name",
+			user: &types.User{
+				Name: "John Doe",
+			},
+			expectedInitial: "JD",
+		},
+		{
+			name: "Test with valid handle",
+			user: &types.User{
+				Handle: "johndoe",
+			},
+			expectedInitial: "J",
+		},
+		{
+			name: "Test handle with a delimiter",
+			user: &types.User{
+				Handle: "john_doe",
+			},
+			expectedInitial: "JD",
+		},
+		{
+			name: "Test with valid handle",
+			user: &types.User{
+				Email: "johndoe@example.com",
+			},
+			expectedInitial: "J",
+		},
+		{
+			name: "Test email with a delimiter",
+			user: &types.User{
+				Email: "john-doe@example.com",
+			},
+			expectedInitial: "JD",
+		},
+		{
+			name: "Test with one letter name",
+			user: &types.User{
+				Name: "K",
+			},
+			expectedInitial: "K",
+		},
+		{
+			name: "Test with one name",
+			user: &types.User{
+				Name: "Doe",
+			},
+			expectedInitial: "DO",
+		},
+		{
+			name: "Test with three names",
+			user: &types.User{
+				Name: "John David Doe",
+			},
+			expectedInitial: "JDD",
+		},
+		{
+			name: "Test with a name that has a valid and invalid letter",
+			user: &types.User{
+				Name: "k-",
+			},
+			expectedInitial: "K",
+		},
+	}
+
+	// Run test cases
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			initial := processAvatarInitials(tc.user)
+			assert.Equal(t, tc.expectedInitial, initial)
+		})
+	}
+}
diff --git a/server/system/types/app_settings.go b/server/system/types/app_settings.go
index 67a830b0d..67b71b845 100644
--- a/server/system/types/app_settings.go
+++ b/server/system/types/app_settings.go
@@ -74,6 +74,8 @@ type (
 				SplitCredentialsCheck bool `json:"-" kv:"split-credentials-check"`
 
 				PasswordConstraints PasswordConstraints `kv:"password-constraints" json:"passwordConstraints"`
+
+				ProfileAvatar struct { Enabled bool } `kv:"profile-avatar" json:"profile-avatar"`
 			} `json:"internal"`
 
 			External struct {
diff --git a/server/system/types/attachment.go b/server/system/types/attachment.go
index d798be724..4ecde0824 100644
--- a/server/system/types/attachment.go
+++ b/server/system/types/attachment.go
@@ -41,9 +41,12 @@ type (
 	}
 
 	AttachmentImageMeta struct {
-		Width    int  `json:"width,omitempty"`
-		Height   int  `json:"height,omitempty"`
-		Animated bool `json:"animated"`
+		Width           int    `json:"width,omitempty"`
+		Height          int    `json:"height,omitempty"`
+		Animated        bool   `json:"animated"`
+		Initial         string `json:"initial,omitempty"`
+		InitialColor    string `json:"initial-color,omitempty"`
+		BackgroundColor string `json:"background-color,omitempty"`
 	}
 
 	AttachmentFileMeta struct {
@@ -61,7 +64,9 @@ type (
 )
 
 const (
-	AttachmentKindSettings string = "settings"
+	AttachmentKindSettings       string = "settings"
+	AttachmentKindAvatar         string = "avatar"
+	AttachmentKindAvatarInitials string = "avatar-initials"
 )
 
 func (a *Attachment) SetOriginalImageMeta(width, height int, animated bool) *AttachmentFileMeta {
diff --git a/server/system/types/user.go b/server/system/types/user.go
index 617f26731..ba99a2277 100644
--- a/server/system/types/user.go
+++ b/server/system/types/user.go
@@ -37,8 +37,13 @@ type (
 	}
 
 	UserMeta struct {
-		// @todo remove, obsolete.
-		Avatar string `json:"avatar,omitempty"`
+		// User's profile avatar photo attachment ID
+		AvatarID   uint64 `json:"avatarID,string"`
+		AvatarKind string `json:"avatarKind,omitempty"`
+
+		// User's avatar initial text and background color
+		AvatarColor   string `json:"avatarColor,omitempty"`
+		AvatarBgColor string `json:"avatarBgColor,omitempty"`
 
 		PreferredLanguage string `json:"preferredLanguage"`
 
diff --git a/server/vendor/github.com/fogleman/gg/.gitignore b/server/vendor/github.com/fogleman/gg/.gitignore
new file mode 100644
index 000000000..2fa80d66b
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/.gitignore
@@ -0,0 +1,2 @@
+*.png
+
diff --git a/server/vendor/github.com/fogleman/gg/LICENSE.md b/server/vendor/github.com/fogleman/gg/LICENSE.md
new file mode 100644
index 000000000..d7b4099fa
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/LICENSE.md
@@ -0,0 +1,19 @@
+Copyright (C) 2016 Michael Fogleman
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/server/vendor/github.com/fogleman/gg/README.md b/server/vendor/github.com/fogleman/gg/README.md
new file mode 100644
index 000000000..575f0ecde
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/README.md
@@ -0,0 +1,221 @@
+# Go Graphics
+
+`gg` is a library for rendering 2D graphics in pure Go.
+
+![Stars](http://i.imgur.com/CylQIJt.png)
+
+## Installation
+
+    go get -u github.com/fogleman/gg
+
+Alternatively, you may use gopkg.in to grab a specific major-version:
+
+    go get -u gopkg.in/fogleman/gg.v1
+
+## Documentation
+
+https://godoc.org/github.com/fogleman/gg
+
+## Hello, Circle!
+
+Look how easy!
+
+```go
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+    dc := gg.NewContext(1000, 1000)
+    dc.DrawCircle(500, 500, 400)
+    dc.SetRGB(0, 0, 0)
+    dc.Fill()
+    dc.SavePNG("out.png")
+}
+```
+
+## Examples
+
+There are [lots of examples](https://github.com/fogleman/gg/tree/master/examples) included. They're mostly for testing the code, but they're good for learning, too.
+
+![Examples](http://i.imgur.com/tMFoyzu.png)
+
+## Creating Contexts
+
+There are a few ways of creating a context.
+
+```go
+NewContext(width, height int) *Context
+NewContextForImage(im image.Image) *Context
+NewContextForRGBA(im *image.RGBA) *Context
+```
+
+## Drawing Functions
+
+Ever used a graphics library that didn't have functions for drawing rectangles
+or circles? What a pain!
+
+```go
+DrawPoint(x, y, r float64)
+DrawLine(x1, y1, x2, y2 float64)
+DrawRectangle(x, y, w, h float64)
+DrawRoundedRectangle(x, y, w, h, r float64)
+DrawCircle(x, y, r float64)
+DrawArc(x, y, r, angle1, angle2 float64)
+DrawEllipse(x, y, rx, ry float64)
+DrawEllipticalArc(x, y, rx, ry, angle1, angle2 float64)
+DrawRegularPolygon(n int, x, y, r, rotation float64)
+DrawImage(im image.Image, x, y int)
+DrawImageAnchored(im image.Image, x, y int, ax, ay float64)
+SetPixel(x, y int)
+
+MoveTo(x, y float64)
+LineTo(x, y float64)
+QuadraticTo(x1, y1, x2, y2 float64)
+CubicTo(x1, y1, x2, y2, x3, y3 float64)
+ClosePath()
+ClearPath()
+NewSubPath()
+
+Clear()
+Stroke()
+Fill()
+StrokePreserve()
+FillPreserve()
+```
+
+It is often desired to center an image at a point. Use `DrawImageAnchored` with `ax` and `ay` set to 0.5 to do this. Use 0 to left or top align. Use 1 to right or bottom align. `DrawStringAnchored` does the same for text, so you don't need to call `MeasureString` yourself.
+
+## Text Functions
+
+It will even do word wrap for you!
+
+```go
+DrawString(s string, x, y float64)
+DrawStringAnchored(s string, x, y, ax, ay float64)
+DrawStringWrapped(s string, x, y, ax, ay, width, lineSpacing float64, align Align)
+MeasureString(s string) (w, h float64)
+MeasureMultilineString(s string, lineSpacing float64) (w, h float64)
+WordWrap(s string, w float64) []string
+SetFontFace(fontFace font.Face)
+LoadFontFace(path string, points float64) error
+```
+
+## Color Functions
+
+Colors can be set in several different ways for your convenience.
+
+```go
+SetRGB(r, g, b float64)
+SetRGBA(r, g, b, a float64)
+SetRGB255(r, g, b int)
+SetRGBA255(r, g, b, a int)
+SetColor(c color.Color)
+SetHexColor(x string)
+```
+
+## Stroke & Fill Options
+
+```go
+SetLineWidth(lineWidth float64)
+SetLineCap(lineCap LineCap)
+SetLineJoin(lineJoin LineJoin)
+SetDash(dashes ...float64)
+SetDashOffset(offset float64)
+SetFillRule(fillRule FillRule)
+```
+
+## Gradients & Patterns
+
+`gg` supports linear and radial gradients and surface patterns. You can also implement your own patterns.
+
+```go
+SetFillStyle(pattern Pattern)
+SetStrokeStyle(pattern Pattern)
+NewSolidPattern(color color.Color)
+NewLinearGradient(x0, y0, x1, y1 float64)
+NewRadialGradient(x0, y0, r0, x1, y1, r1 float64)
+NewSurfacePattern(im image.Image, op RepeatOp)
+```
+
+## Transformation Functions
+
+```go
+Identity()
+Translate(x, y float64)
+Scale(x, y float64)
+Rotate(angle float64)
+Shear(x, y float64)
+ScaleAbout(sx, sy, x, y float64)
+RotateAbout(angle, x, y float64)
+ShearAbout(sx, sy, x, y float64)
+TransformPoint(x, y float64) (tx, ty float64)
+InvertY()
+```
+
+It is often desired to rotate or scale about a point that is not the origin. The functions `RotateAbout`, `ScaleAbout`, `ShearAbout` are provided as a convenience.
+
+`InvertY` is provided in case Y should increase from bottom to top vs. the default top to bottom.
+
+## Stack Functions
+
+Save and restore the state of the context. These can be nested.
+
+```go
+Push()
+Pop()
+```
+
+## Clipping Functions
+
+Use clipping regions to restrict drawing operations to an area that you
+defined using paths.
+
+```go
+Clip()
+ClipPreserve()
+ResetClip()
+AsMask() *image.Alpha
+SetMask(mask *image.Alpha)
+InvertMask()
+```
+
+## Helper Functions
+
+Sometimes you just don't want to write these yourself.
+
+```go
+Radians(degrees float64) float64
+Degrees(radians float64) float64
+LoadImage(path string) (image.Image, error)
+LoadPNG(path string) (image.Image, error)
+SavePNG(path string, im image.Image) error
+```
+
+![Separator](http://i.imgur.com/fsUvnPB.png)
+
+## Another Example
+
+See the output of this example below.
+
+```go
+package main
+
+import "github.com/fogleman/gg"
+
+func main() {
+	const S = 1024
+	dc := gg.NewContext(S, S)
+	dc.SetRGBA(0, 0, 0, 0.1)
+	for i := 0; i < 360; i += 15 {
+		dc.Push()
+		dc.RotateAbout(gg.Radians(float64(i)), S/2, S/2)
+		dc.DrawEllipse(S/2, S/2, S*7/16, S/8)
+		dc.Fill()
+		dc.Pop()
+	}
+	dc.SavePNG("out.png")
+}
+```
+
+![Ellipses](http://i.imgur.com/J9CBZef.png)
diff --git a/server/vendor/github.com/fogleman/gg/bezier.go b/server/vendor/github.com/fogleman/gg/bezier.go
new file mode 100644
index 000000000..f2cd7ab87
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/bezier.go
@@ -0,0 +1,59 @@
+package gg
+
+import "math"
+
+func quadratic(x0, y0, x1, y1, x2, y2, t float64) (x, y float64) {
+	u := 1 - t
+	a := u * u
+	b := 2 * u * t
+	c := t * t
+	x = a*x0 + b*x1 + c*x2
+	y = a*y0 + b*y1 + c*y2
+	return
+}
+
+func QuadraticBezier(x0, y0, x1, y1, x2, y2 float64) []Point {
+	l := (math.Hypot(x1-x0, y1-y0) +
+		math.Hypot(x2-x1, y2-y1))
+	n := int(l + 0.5)
+	if n < 4 {
+		n = 4
+	}
+	d := float64(n) - 1
+	result := make([]Point, n)
+	for i := 0; i < n; i++ {
+		t := float64(i) / d
+		x, y := quadratic(x0, y0, x1, y1, x2, y2, t)
+		result[i] = Point{x, y}
+	}
+	return result
+}
+
+func cubic(x0, y0, x1, y1, x2, y2, x3, y3, t float64) (x, y float64) {
+	u := 1 - t
+	a := u * u * u
+	b := 3 * u * u * t
+	c := 3 * u * t * t
+	d := t * t * t
+	x = a*x0 + b*x1 + c*x2 + d*x3
+	y = a*y0 + b*y1 + c*y2 + d*y3
+	return
+}
+
+func CubicBezier(x0, y0, x1, y1, x2, y2, x3, y3 float64) []Point {
+	l := (math.Hypot(x1-x0, y1-y0) +
+		math.Hypot(x2-x1, y2-y1) +
+		math.Hypot(x3-x2, y3-y2))
+	n := int(l + 0.5)
+	if n < 4 {
+		n = 4
+	}
+	d := float64(n) - 1
+	result := make([]Point, n)
+	for i := 0; i < n; i++ {
+		t := float64(i) / d
+		x, y := cubic(x0, y0, x1, y1, x2, y2, x3, y3, t)
+		result[i] = Point{x, y}
+	}
+	return result
+}
diff --git a/server/vendor/github.com/fogleman/gg/context.go b/server/vendor/github.com/fogleman/gg/context.go
new file mode 100644
index 000000000..427406e79
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/context.go
@@ -0,0 +1,909 @@
+// Package gg provides a simple API for rendering 2D graphics in pure Go.
+package gg
+
+import (
+	"errors"
+	"image"
+	"image/color"
+	"image/png"
+	"io"
+	"math"
+	"strings"
+
+	"github.com/golang/freetype/raster"
+	"golang.org/x/image/draw"
+	"golang.org/x/image/font"
+	"golang.org/x/image/font/basicfont"
+	"golang.org/x/image/math/f64"
+)
+
+type LineCap int
+
+const (
+	LineCapRound LineCap = iota
+	LineCapButt
+	LineCapSquare
+)
+
+type LineJoin int
+
+const (
+	LineJoinRound LineJoin = iota
+	LineJoinBevel
+)
+
+type FillRule int
+
+const (
+	FillRuleWinding FillRule = iota
+	FillRuleEvenOdd
+)
+
+type Align int
+
+const (
+	AlignLeft Align = iota
+	AlignCenter
+	AlignRight
+)
+
+var (
+	defaultFillStyle   = NewSolidPattern(color.White)
+	defaultStrokeStyle = NewSolidPattern(color.Black)
+)
+
+type Context struct {
+	width         int
+	height        int
+	rasterizer    *raster.Rasterizer
+	im            *image.RGBA
+	mask          *image.Alpha
+	color         color.Color
+	fillPattern   Pattern
+	strokePattern Pattern
+	strokePath    raster.Path
+	fillPath      raster.Path
+	start         Point
+	current       Point
+	hasCurrent    bool
+	dashes        []float64
+	dashOffset    float64
+	lineWidth     float64
+	lineCap       LineCap
+	lineJoin      LineJoin
+	fillRule      FillRule
+	fontFace      font.Face
+	fontHeight    float64
+	matrix        Matrix
+	stack         []*Context
+}
+
+// NewContext creates a new image.RGBA with the specified width and height
+// and prepares a context for rendering onto that image.
+func NewContext(width, height int) *Context {
+	return NewContextForRGBA(image.NewRGBA(image.Rect(0, 0, width, height)))
+}
+
+// NewContextForImage copies the specified image into a new image.RGBA
+// and prepares a context for rendering onto that image.
+func NewContextForImage(im image.Image) *Context {
+	return NewContextForRGBA(imageToRGBA(im))
+}
+
+// NewContextForRGBA prepares a context for rendering onto the specified image.
+// No copy is made.
+func NewContextForRGBA(im *image.RGBA) *Context {
+	w := im.Bounds().Size().X
+	h := im.Bounds().Size().Y
+	return &Context{
+		width:         w,
+		height:        h,
+		rasterizer:    raster.NewRasterizer(w, h),
+		im:            im,
+		color:         color.Transparent,
+		fillPattern:   defaultFillStyle,
+		strokePattern: defaultStrokeStyle,
+		lineWidth:     1,
+		fillRule:      FillRuleWinding,
+		fontFace:      basicfont.Face7x13,
+		fontHeight:    13,
+		matrix:        Identity(),
+	}
+}
+
+// GetCurrentPoint will return the current point and if there is a current point.
+// The point will have been transformed by the context's transformation matrix.
+func (dc *Context) GetCurrentPoint() (Point, bool) {
+	if dc.hasCurrent {
+		return dc.current, true
+	}
+	return Point{}, false
+}
+
+// Image returns the image that has been drawn by this context.
+func (dc *Context) Image() image.Image {
+	return dc.im
+}
+
+// Width returns the width of the image in pixels.
+func (dc *Context) Width() int {
+	return dc.width
+}
+
+// Height returns the height of the image in pixels.
+func (dc *Context) Height() int {
+	return dc.height
+}
+
+// SavePNG encodes the image as a PNG and writes it to disk.
+func (dc *Context) SavePNG(path string) error {
+	return SavePNG(path, dc.im)
+}
+
+// EncodePNG encodes the image as a PNG and writes it to the provided io.Writer.
+func (dc *Context) EncodePNG(w io.Writer) error {
+	return png.Encode(w, dc.im)
+}
+
+// SetDash sets the current dash pattern to use. Call with zero arguments to
+// disable dashes. The values specify the lengths of each dash, with
+// alternating on and off lengths.
+func (dc *Context) SetDash(dashes ...float64) {
+	dc.dashes = dashes
+}
+
+// SetDashOffset sets the initial offset into the dash pattern to use when
+// stroking dashed paths.
+func (dc *Context) SetDashOffset(offset float64) {
+	dc.dashOffset = offset
+}
+
+func (dc *Context) SetLineWidth(lineWidth float64) {
+	dc.lineWidth = lineWidth
+}
+
+func (dc *Context) SetLineCap(lineCap LineCap) {
+	dc.lineCap = lineCap
+}
+
+func (dc *Context) SetLineCapRound() {
+	dc.lineCap = LineCapRound
+}
+
+func (dc *Context) SetLineCapButt() {
+	dc.lineCap = LineCapButt
+}
+
+func (dc *Context) SetLineCapSquare() {
+	dc.lineCap = LineCapSquare
+}
+
+func (dc *Context) SetLineJoin(lineJoin LineJoin) {
+	dc.lineJoin = lineJoin
+}
+
+func (dc *Context) SetLineJoinRound() {
+	dc.lineJoin = LineJoinRound
+}
+
+func (dc *Context) SetLineJoinBevel() {
+	dc.lineJoin = LineJoinBevel
+}
+
+func (dc *Context) SetFillRule(fillRule FillRule) {
+	dc.fillRule = fillRule
+}
+
+func (dc *Context) SetFillRuleWinding() {
+	dc.fillRule = FillRuleWinding
+}
+
+func (dc *Context) SetFillRuleEvenOdd() {
+	dc.fillRule = FillRuleEvenOdd
+}
+
+// Color Setters
+
+func (dc *Context) setFillAndStrokeColor(c color.Color) {
+	dc.color = c
+	dc.fillPattern = NewSolidPattern(c)
+	dc.strokePattern = NewSolidPattern(c)
+}
+
+// SetFillStyle sets current fill style
+func (dc *Context) SetFillStyle(pattern Pattern) {
+	// if pattern is SolidPattern, also change dc.color(for dc.Clear, dc.drawString)
+	if fillStyle, ok := pattern.(*solidPattern); ok {
+		dc.color = fillStyle.color
+	}
+	dc.fillPattern = pattern
+}
+
+// SetStrokeStyle sets current stroke style
+func (dc *Context) SetStrokeStyle(pattern Pattern) {
+	dc.strokePattern = pattern
+}
+
+// SetColor sets the current color(for both fill and stroke).
+func (dc *Context) SetColor(c color.Color) {
+	dc.setFillAndStrokeColor(c)
+}
+
+// SetHexColor sets the current color using a hex string. The leading pound
+// sign (#) is optional. Both 3- and 6-digit variations are supported. 8 digits
+// may be provided to set the alpha value as well.
+func (dc *Context) SetHexColor(x string) {
+	r, g, b, a := parseHexColor(x)
+	dc.SetRGBA255(r, g, b, a)
+}
+
+// SetRGBA255 sets the current color. r, g, b, a values should be between 0 and
+// 255, inclusive.
+func (dc *Context) SetRGBA255(r, g, b, a int) {
+	dc.color = color.NRGBA{uint8(r), uint8(g), uint8(b), uint8(a)}
+	dc.setFillAndStrokeColor(dc.color)
+}
+
+// SetRGB255 sets the current color. r, g, b values should be between 0 and 255,
+// inclusive. Alpha will be set to 255 (fully opaque).
+func (dc *Context) SetRGB255(r, g, b int) {
+	dc.SetRGBA255(r, g, b, 255)
+}
+
+// SetRGBA sets the current color. r, g, b, a values should be between 0 and 1,
+// inclusive.
+func (dc *Context) SetRGBA(r, g, b, a float64) {
+	dc.color = color.NRGBA{
+		uint8(r * 255),
+		uint8(g * 255),
+		uint8(b * 255),
+		uint8(a * 255),
+	}
+	dc.setFillAndStrokeColor(dc.color)
+}
+
+// SetRGB sets the current color. r, g, b values should be between 0 and 1,
+// inclusive. Alpha will be set to 1 (fully opaque).
+func (dc *Context) SetRGB(r, g, b float64) {
+	dc.SetRGBA(r, g, b, 1)
+}
+
+// Path Manipulation
+
+// MoveTo starts a new subpath within the current path starting at the
+// specified point.
+func (dc *Context) MoveTo(x, y float64) {
+	if dc.hasCurrent {
+		dc.fillPath.Add1(dc.start.Fixed())
+	}
+	x, y = dc.TransformPoint(x, y)
+	p := Point{x, y}
+	dc.strokePath.Start(p.Fixed())
+	dc.fillPath.Start(p.Fixed())
+	dc.start = p
+	dc.current = p
+	dc.hasCurrent = true
+}
+
+// LineTo adds a line segment to the current path starting at the current
+// point. If there is no current point, it is equivalent to MoveTo(x, y)
+func (dc *Context) LineTo(x, y float64) {
+	if !dc.hasCurrent {
+		dc.MoveTo(x, y)
+	} else {
+		x, y = dc.TransformPoint(x, y)
+		p := Point{x, y}
+		dc.strokePath.Add1(p.Fixed())
+		dc.fillPath.Add1(p.Fixed())
+		dc.current = p
+	}
+}
+
+// QuadraticTo adds a quadratic bezier curve to the current path starting at
+// the current point. If there is no current point, it first performs
+// MoveTo(x1, y1)
+func (dc *Context) QuadraticTo(x1, y1, x2, y2 float64) {
+	if !dc.hasCurrent {
+		dc.MoveTo(x1, y1)
+	}
+	x1, y1 = dc.TransformPoint(x1, y1)
+	x2, y2 = dc.TransformPoint(x2, y2)
+	p1 := Point{x1, y1}
+	p2 := Point{x2, y2}
+	dc.strokePath.Add2(p1.Fixed(), p2.Fixed())
+	dc.fillPath.Add2(p1.Fixed(), p2.Fixed())
+	dc.current = p2
+}
+
+// CubicTo adds a cubic bezier curve to the current path starting at the
+// current point. If there is no current point, it first performs
+// MoveTo(x1, y1). Because freetype/raster does not support cubic beziers,
+// this is emulated with many small line segments.
+func (dc *Context) CubicTo(x1, y1, x2, y2, x3, y3 float64) {
+	if !dc.hasCurrent {
+		dc.MoveTo(x1, y1)
+	}
+	x0, y0 := dc.current.X, dc.current.Y
+	x1, y1 = dc.TransformPoint(x1, y1)
+	x2, y2 = dc.TransformPoint(x2, y2)
+	x3, y3 = dc.TransformPoint(x3, y3)
+	points := CubicBezier(x0, y0, x1, y1, x2, y2, x3, y3)
+	previous := dc.current.Fixed()
+	for _, p := range points[1:] {
+		f := p.Fixed()
+		if f == previous {
+			// TODO: this fixes some rendering issues but not all
+			continue
+		}
+		previous = f
+		dc.strokePath.Add1(f)
+		dc.fillPath.Add1(f)
+		dc.current = p
+	}
+}
+
+// ClosePath adds a line segment from the current point to the beginning
+// of the current subpath. If there is no current point, this is a no-op.
+func (dc *Context) ClosePath() {
+	if dc.hasCurrent {
+		dc.strokePath.Add1(dc.start.Fixed())
+		dc.fillPath.Add1(dc.start.Fixed())
+		dc.current = dc.start
+	}
+}
+
+// ClearPath clears the current path. There is no current point after this
+// operation.
+func (dc *Context) ClearPath() {
+	dc.strokePath.Clear()
+	dc.fillPath.Clear()
+	dc.hasCurrent = false
+}
+
+// NewSubPath starts a new subpath within the current path. There is no current
+// point after this operation.
+func (dc *Context) NewSubPath() {
+	if dc.hasCurrent {
+		dc.fillPath.Add1(dc.start.Fixed())
+	}
+	dc.hasCurrent = false
+}
+
+// Path Drawing
+
+func (dc *Context) capper() raster.Capper {
+	switch dc.lineCap {
+	case LineCapButt:
+		return raster.ButtCapper
+	case LineCapRound:
+		return raster.RoundCapper
+	case LineCapSquare:
+		return raster.SquareCapper
+	}
+	return nil
+}
+
+func (dc *Context) joiner() raster.Joiner {
+	switch dc.lineJoin {
+	case LineJoinBevel:
+		return raster.BevelJoiner
+	case LineJoinRound:
+		return raster.RoundJoiner
+	}
+	return nil
+}
+
+func (dc *Context) stroke(painter raster.Painter) {
+	path := dc.strokePath
+	if len(dc.dashes) > 0 {
+		path = dashed(path, dc.dashes, dc.dashOffset)
+	} else {
+		// TODO: this is a temporary workaround to remove tiny segments
+		// that result in rendering issues
+		path = rasterPath(flattenPath(path))
+	}
+	r := dc.rasterizer
+	r.UseNonZeroWinding = true
+	r.Clear()
+	r.AddStroke(path, fix(dc.lineWidth), dc.capper(), dc.joiner())
+	r.Rasterize(painter)
+}
+
+func (dc *Context) fill(painter raster.Painter) {
+	path := dc.fillPath
+	if dc.hasCurrent {
+		path = make(raster.Path, len(dc.fillPath))
+		copy(path, dc.fillPath)
+		path.Add1(dc.start.Fixed())
+	}
+	r := dc.rasterizer
+	r.UseNonZeroWinding = dc.fillRule == FillRuleWinding
+	r.Clear()
+	r.AddPath(path)
+	r.Rasterize(painter)
+}
+
+// StrokePreserve strokes the current path with the current color, line width,
+// line cap, line join and dash settings. The path is preserved after this
+// operation.
+func (dc *Context) StrokePreserve() {
+	var painter raster.Painter
+	if dc.mask == nil {
+		if pattern, ok := dc.strokePattern.(*solidPattern); ok {
+			// with a nil mask and a solid color pattern, we can be more efficient
+			// TODO: refactor so we don't have to do this type assertion stuff?
+			p := raster.NewRGBAPainter(dc.im)
+			p.SetColor(pattern.color)
+			painter = p
+		}
+	}
+	if painter == nil {
+		painter = newPatternPainter(dc.im, dc.mask, dc.strokePattern)
+	}
+	dc.stroke(painter)
+}
+
+// Stroke strokes the current path with the current color, line width,
+// line cap, line join and dash settings. The path is cleared after this
+// operation.
+func (dc *Context) Stroke() {
+	dc.StrokePreserve()
+	dc.ClearPath()
+}
+
+// FillPreserve fills the current path with the current color. Open subpaths
+// are implicity closed. The path is preserved after this operation.
+func (dc *Context) FillPreserve() {
+	var painter raster.Painter
+	if dc.mask == nil {
+		if pattern, ok := dc.fillPattern.(*solidPattern); ok {
+			// with a nil mask and a solid color pattern, we can be more efficient
+			// TODO: refactor so we don't have to do this type assertion stuff?
+			p := raster.NewRGBAPainter(dc.im)
+			p.SetColor(pattern.color)
+			painter = p
+		}
+	}
+	if painter == nil {
+		painter = newPatternPainter(dc.im, dc.mask, dc.fillPattern)
+	}
+	dc.fill(painter)
+}
+
+// Fill fills the current path with the current color. Open subpaths
+// are implicity closed. The path is cleared after this operation.
+func (dc *Context) Fill() {
+	dc.FillPreserve()
+	dc.ClearPath()
+}
+
+// ClipPreserve updates the clipping region by intersecting the current
+// clipping region with the current path as it would be filled by dc.Fill().
+// The path is preserved after this operation.
+func (dc *Context) ClipPreserve() {
+	clip := image.NewAlpha(image.Rect(0, 0, dc.width, dc.height))
+	painter := raster.NewAlphaOverPainter(clip)
+	dc.fill(painter)
+	if dc.mask == nil {
+		dc.mask = clip
+	} else {
+		mask := image.NewAlpha(image.Rect(0, 0, dc.width, dc.height))
+		draw.DrawMask(mask, mask.Bounds(), clip, image.ZP, dc.mask, image.ZP, draw.Over)
+		dc.mask = mask
+	}
+}
+
+// SetMask allows you to directly set the *image.Alpha to be used as a clipping
+// mask. It must be the same size as the context, else an error is returned
+// and the mask is unchanged.
+func (dc *Context) SetMask(mask *image.Alpha) error {
+	if mask.Bounds().Size() != dc.im.Bounds().Size() {
+		return errors.New("mask size must match context size")
+	}
+	dc.mask = mask
+	return nil
+}
+
+// AsMask returns an *image.Alpha representing the alpha channel of this
+// context. This can be useful for advanced clipping operations where you first
+// render the mask geometry and then use it as a mask.
+func (dc *Context) AsMask() *image.Alpha {
+	mask := image.NewAlpha(dc.im.Bounds())
+	draw.Draw(mask, dc.im.Bounds(), dc.im, image.ZP, draw.Src)
+	return mask
+}
+
+// InvertMask inverts the alpha values in the current clipping mask such that
+// a fully transparent region becomes fully opaque and vice versa.
+func (dc *Context) InvertMask() {
+	if dc.mask == nil {
+		dc.mask = image.NewAlpha(dc.im.Bounds())
+	} else {
+		for i, a := range dc.mask.Pix {
+			dc.mask.Pix[i] = 255 - a
+		}
+	}
+}
+
+// Clip updates the clipping region by intersecting the current
+// clipping region with the current path as it would be filled by dc.Fill().
+// The path is cleared after this operation.
+func (dc *Context) Clip() {
+	dc.ClipPreserve()
+	dc.ClearPath()
+}
+
+// ResetClip clears the clipping region.
+func (dc *Context) ResetClip() {
+	dc.mask = nil
+}
+
+// Convenient Drawing Functions
+
+// Clear fills the entire image with the current color.
+func (dc *Context) Clear() {
+	src := image.NewUniform(dc.color)
+	draw.Draw(dc.im, dc.im.Bounds(), src, image.ZP, draw.Src)
+}
+
+// SetPixel sets the color of the specified pixel using the current color.
+func (dc *Context) SetPixel(x, y int) {
+	dc.im.Set(x, y, dc.color)
+}
+
+// DrawPoint is like DrawCircle but ensures that a circle of the specified
+// size is drawn regardless of the current transformation matrix. The position
+// is still transformed, but not the shape of the point.
+func (dc *Context) DrawPoint(x, y, r float64) {
+	dc.Push()
+	tx, ty := dc.TransformPoint(x, y)
+	dc.Identity()
+	dc.DrawCircle(tx, ty, r)
+	dc.Pop()
+}
+
+func (dc *Context) DrawLine(x1, y1, x2, y2 float64) {
+	dc.MoveTo(x1, y1)
+	dc.LineTo(x2, y2)
+}
+
+func (dc *Context) DrawRectangle(x, y, w, h float64) {
+	dc.NewSubPath()
+	dc.MoveTo(x, y)
+	dc.LineTo(x+w, y)
+	dc.LineTo(x+w, y+h)
+	dc.LineTo(x, y+h)
+	dc.ClosePath()
+}
+
+func (dc *Context) DrawRoundedRectangle(x, y, w, h, r float64) {
+	x0, x1, x2, x3 := x, x+r, x+w-r, x+w
+	y0, y1, y2, y3 := y, y+r, y+h-r, y+h
+	dc.NewSubPath()
+	dc.MoveTo(x1, y0)
+	dc.LineTo(x2, y0)
+	dc.DrawArc(x2, y1, r, Radians(270), Radians(360))
+	dc.LineTo(x3, y2)
+	dc.DrawArc(x2, y2, r, Radians(0), Radians(90))
+	dc.LineTo(x1, y3)
+	dc.DrawArc(x1, y2, r, Radians(90), Radians(180))
+	dc.LineTo(x0, y1)
+	dc.DrawArc(x1, y1, r, Radians(180), Radians(270))
+	dc.ClosePath()
+}
+
+func (dc *Context) DrawEllipticalArc(x, y, rx, ry, angle1, angle2 float64) {
+	const n = 16
+	for i := 0; i < n; i++ {
+		p1 := float64(i+0) / n
+		p2 := float64(i+1) / n
+		a1 := angle1 + (angle2-angle1)*p1
+		a2 := angle1 + (angle2-angle1)*p2
+		x0 := x + rx*math.Cos(a1)
+		y0 := y + ry*math.Sin(a1)
+		x1 := x + rx*math.Cos((a1+a2)/2)
+		y1 := y + ry*math.Sin((a1+a2)/2)
+		x2 := x + rx*math.Cos(a2)
+		y2 := y + ry*math.Sin(a2)
+		cx := 2*x1 - x0/2 - x2/2
+		cy := 2*y1 - y0/2 - y2/2
+		if i == 0 {
+			if dc.hasCurrent {
+				dc.LineTo(x0, y0)
+			} else {
+				dc.MoveTo(x0, y0)
+			}
+		}
+		dc.QuadraticTo(cx, cy, x2, y2)
+	}
+}
+
+func (dc *Context) DrawEllipse(x, y, rx, ry float64) {
+	dc.NewSubPath()
+	dc.DrawEllipticalArc(x, y, rx, ry, 0, 2*math.Pi)
+	dc.ClosePath()
+}
+
+func (dc *Context) DrawArc(x, y, r, angle1, angle2 float64) {
+	dc.DrawEllipticalArc(x, y, r, r, angle1, angle2)
+}
+
+func (dc *Context) DrawCircle(x, y, r float64) {
+	dc.NewSubPath()
+	dc.DrawEllipticalArc(x, y, r, r, 0, 2*math.Pi)
+	dc.ClosePath()
+}
+
+func (dc *Context) DrawRegularPolygon(n int, x, y, r, rotation float64) {
+	angle := 2 * math.Pi / float64(n)
+	rotation -= math.Pi / 2
+	if n%2 == 0 {
+		rotation += angle / 2
+	}
+	dc.NewSubPath()
+	for i := 0; i < n; i++ {
+		a := rotation + angle*float64(i)
+		dc.LineTo(x+r*math.Cos(a), y+r*math.Sin(a))
+	}
+	dc.ClosePath()
+}
+
+// DrawImage draws the specified image at the specified point.
+func (dc *Context) DrawImage(im image.Image, x, y int) {
+	dc.DrawImageAnchored(im, x, y, 0, 0)
+}
+
+// DrawImageAnchored draws the specified image at the specified anchor point.
+// The anchor point is x - w * ax, y - h * ay, where w, h is the size of the
+// image. Use ax=0.5, ay=0.5 to center the image at the specified point.
+func (dc *Context) DrawImageAnchored(im image.Image, x, y int, ax, ay float64) {
+	s := im.Bounds().Size()
+	x -= int(ax * float64(s.X))
+	y -= int(ay * float64(s.Y))
+	transformer := draw.BiLinear
+	fx, fy := float64(x), float64(y)
+	m := dc.matrix.Translate(fx, fy)
+	s2d := f64.Aff3{m.XX, m.XY, m.X0, m.YX, m.YY, m.Y0}
+	if dc.mask == nil {
+		transformer.Transform(dc.im, s2d, im, im.Bounds(), draw.Over, nil)
+	} else {
+		transformer.Transform(dc.im, s2d, im, im.Bounds(), draw.Over, &draw.Options{
+			DstMask:  dc.mask,
+			DstMaskP: image.ZP,
+		})
+	}
+}
+
+// Text Functions
+
+func (dc *Context) SetFontFace(fontFace font.Face) {
+	dc.fontFace = fontFace
+	dc.fontHeight = float64(fontFace.Metrics().Height) / 64
+}
+
+func (dc *Context) LoadFontFace(path string, points float64) error {
+	face, err := LoadFontFace(path, points)
+	if err == nil {
+		dc.fontFace = face
+		dc.fontHeight = points * 72 / 96
+	}
+	return err
+}
+
+func (dc *Context) FontHeight() float64 {
+	return dc.fontHeight
+}
+
+func (dc *Context) drawString(im *image.RGBA, s string, x, y float64) {
+	d := &font.Drawer{
+		Dst:  im,
+		Src:  image.NewUniform(dc.color),
+		Face: dc.fontFace,
+		Dot:  fixp(x, y),
+	}
+	// based on Drawer.DrawString() in golang.org/x/image/font/font.go
+	prevC := rune(-1)
+	for _, c := range s {
+		if prevC >= 0 {
+			d.Dot.X += d.Face.Kern(prevC, c)
+		}
+		dr, mask, maskp, advance, ok := d.Face.Glyph(d.Dot, c)
+		if !ok {
+			// TODO: is falling back on the U+FFFD glyph the responsibility of
+			// the Drawer or the Face?
+			// TODO: set prevC = '\ufffd'?
+			continue
+		}
+		sr := dr.Sub(dr.Min)
+		transformer := draw.BiLinear
+		fx, fy := float64(dr.Min.X), float64(dr.Min.Y)
+		m := dc.matrix.Translate(fx, fy)
+		s2d := f64.Aff3{m.XX, m.XY, m.X0, m.YX, m.YY, m.Y0}
+		transformer.Transform(d.Dst, s2d, d.Src, sr, draw.Over, &draw.Options{
+			SrcMask:  mask,
+			SrcMaskP: maskp,
+		})
+		d.Dot.X += advance
+		prevC = c
+	}
+}
+
+// DrawString draws the specified text at the specified point.
+func (dc *Context) DrawString(s string, x, y float64) {
+	dc.DrawStringAnchored(s, x, y, 0, 0)
+}
+
+// DrawStringAnchored draws the specified text at the specified anchor point.
+// The anchor point is x - w * ax, y - h * ay, where w, h is the size of the
+// text. Use ax=0.5, ay=0.5 to center the text at the specified point.
+func (dc *Context) DrawStringAnchored(s string, x, y, ax, ay float64) {
+	w, h := dc.MeasureString(s)
+	x -= ax * w
+	y += ay * h
+	if dc.mask == nil {
+		dc.drawString(dc.im, s, x, y)
+	} else {
+		im := image.NewRGBA(image.Rect(0, 0, dc.width, dc.height))
+		dc.drawString(im, s, x, y)
+		draw.DrawMask(dc.im, dc.im.Bounds(), im, image.ZP, dc.mask, image.ZP, draw.Over)
+	}
+}
+
+// DrawStringWrapped word-wraps the specified string to the given max width
+// and then draws it at the specified anchor point using the given line
+// spacing and text alignment.
+func (dc *Context) DrawStringWrapped(s string, x, y, ax, ay, width, lineSpacing float64, align Align) {
+	lines := dc.WordWrap(s, width)
+
+	// sync h formula with MeasureMultilineString
+	h := float64(len(lines)) * dc.fontHeight * lineSpacing
+	h -= (lineSpacing - 1) * dc.fontHeight
+
+	x -= ax * width
+	y -= ay * h
+	switch align {
+	case AlignLeft:
+		ax = 0
+	case AlignCenter:
+		ax = 0.5
+		x += width / 2
+	case AlignRight:
+		ax = 1
+		x += width
+	}
+	ay = 1
+	for _, line := range lines {
+		dc.DrawStringAnchored(line, x, y, ax, ay)
+		y += dc.fontHeight * lineSpacing
+	}
+}
+
+func (dc *Context) MeasureMultilineString(s string, lineSpacing float64) (width, height float64) {
+	lines := strings.Split(s, "\n")
+
+	// sync h formula with DrawStringWrapped
+	height = float64(len(lines)) * dc.fontHeight * lineSpacing
+	height -= (lineSpacing - 1) * dc.fontHeight
+
+	d := &font.Drawer{
+		Face: dc.fontFace,
+	}
+
+	// max width from lines
+	for _, line := range lines {
+		adv := d.MeasureString(line)
+		currentWidth := float64(adv >> 6) // from gg.Context.MeasureString
+		if currentWidth > width {
+			width = currentWidth
+		}
+	}
+
+	return width, height
+}
+
+// MeasureString returns the rendered width and height of the specified text
+// given the current font face.
+func (dc *Context) MeasureString(s string) (w, h float64) {
+	d := &font.Drawer{
+		Face: dc.fontFace,
+	}
+	a := d.MeasureString(s)
+	return float64(a >> 6), dc.fontHeight
+}
+
+// WordWrap wraps the specified string to the given max width and current
+// font face.
+func (dc *Context) WordWrap(s string, w float64) []string {
+	return wordWrap(dc, s, w)
+}
+
+// Transformation Matrix Operations
+
+// Identity resets the current transformation matrix to the identity matrix.
+// This results in no translating, scaling, rotating, or shearing.
+func (dc *Context) Identity() {
+	dc.matrix = Identity()
+}
+
+// Translate updates the current matrix with a translation.
+func (dc *Context) Translate(x, y float64) {
+	dc.matrix = dc.matrix.Translate(x, y)
+}
+
+// Scale updates the current matrix with a scaling factor.
+// Scaling occurs about the origin.
+func (dc *Context) Scale(x, y float64) {
+	dc.matrix = dc.matrix.Scale(x, y)
+}
+
+// ScaleAbout updates the current matrix with a scaling factor.
+// Scaling occurs about the specified point.
+func (dc *Context) ScaleAbout(sx, sy, x, y float64) {
+	dc.Translate(x, y)
+	dc.Scale(sx, sy)
+	dc.Translate(-x, -y)
+}
+
+// Rotate updates the current matrix with a clockwise rotation.
+// Rotation occurs about the origin. Angle is specified in radians.
+func (dc *Context) Rotate(angle float64) {
+	dc.matrix = dc.matrix.Rotate(angle)
+}
+
+// RotateAbout updates the current matrix with a clockwise rotation.
+// Rotation occurs about the specified point. Angle is specified in radians.
+func (dc *Context) RotateAbout(angle, x, y float64) {
+	dc.Translate(x, y)
+	dc.Rotate(angle)
+	dc.Translate(-x, -y)
+}
+
+// Shear updates the current matrix with a shearing angle.
+// Shearing occurs about the origin.
+func (dc *Context) Shear(x, y float64) {
+	dc.matrix = dc.matrix.Shear(x, y)
+}
+
+// ShearAbout updates the current matrix with a shearing angle.
+// Shearing occurs about the specified point.
+func (dc *Context) ShearAbout(sx, sy, x, y float64) {
+	dc.Translate(x, y)
+	dc.Shear(sx, sy)
+	dc.Translate(-x, -y)
+}
+
+// TransformPoint multiplies the specified point by the current matrix,
+// returning a transformed position.
+func (dc *Context) TransformPoint(x, y float64) (tx, ty float64) {
+	return dc.matrix.TransformPoint(x, y)
+}
+
+// InvertY flips the Y axis so that Y grows from bottom to top and Y=0 is at
+// the bottom of the image.
+func (dc *Context) InvertY() {
+	dc.Translate(0, float64(dc.height))
+	dc.Scale(1, -1)
+}
+
+// Stack
+
+// Push saves the current state of the context for later retrieval. These
+// can be nested.
+func (dc *Context) Push() {
+	x := *dc
+	dc.stack = append(dc.stack, &x)
+}
+
+// Pop restores the last saved context state from the stack.
+func (dc *Context) Pop() {
+	before := *dc
+	s := dc.stack
+	x, s := s[len(s)-1], s[:len(s)-1]
+	*dc = *x
+	dc.mask = before.mask
+	dc.strokePath = before.strokePath
+	dc.fillPath = before.fillPath
+	dc.start = before.start
+	dc.current = before.current
+	dc.hasCurrent = before.hasCurrent
+}
diff --git a/server/vendor/github.com/fogleman/gg/gradient.go b/server/vendor/github.com/fogleman/gg/gradient.go
new file mode 100644
index 000000000..a9cad59fb
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/gradient.go
@@ -0,0 +1,202 @@
+package gg
+
+import (
+	"image/color"
+	"math"
+	"sort"
+)
+
+type stop struct {
+	pos   float64
+	color color.Color
+}
+
+type stops []stop
+
+// Len satisfies the Sort interface.
+func (s stops) Len() int {
+	return len(s)
+}
+
+// Less satisfies the Sort interface.
+func (s stops) Less(i, j int) bool {
+	return s[i].pos < s[j].pos
+}
+
+// Swap satisfies the Sort interface.
+func (s stops) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+type Gradient interface {
+	Pattern
+	AddColorStop(offset float64, color color.Color)
+}
+
+// Linear Gradient
+type linearGradient struct {
+	x0, y0, x1, y1 float64
+	stops          stops
+}
+
+func (g *linearGradient) ColorAt(x, y int) color.Color {
+	if len(g.stops) == 0 {
+		return color.Transparent
+	}
+
+	fx, fy := float64(x), float64(y)
+	x0, y0, x1, y1 := g.x0, g.y0, g.x1, g.y1
+	dx, dy := x1-x0, y1-y0
+
+	// Horizontal
+	if dy == 0 && dx != 0 {
+		return getColor((fx-x0)/dx, g.stops)
+	}
+
+	// Vertical
+	if dx == 0 && dy != 0 {
+		return getColor((fy-y0)/dy, g.stops)
+	}
+
+	// Dot product
+	s0 := dx*(fx-x0) + dy*(fy-y0)
+	if s0 < 0 {
+		return g.stops[0].color
+	}
+	// Calculate distance to (x0,y0) alone (x0,y0)->(x1,y1)
+	mag := math.Hypot(dx, dy)
+	u := ((fx-x0)*-dy + (fy-y0)*dx) / (mag * mag)
+	x2, y2 := x0+u*-dy, y0+u*dx
+	d := math.Hypot(fx-x2, fy-y2) / mag
+	return getColor(d, g.stops)
+}
+
+func (g *linearGradient) AddColorStop(offset float64, color color.Color) {
+	g.stops = append(g.stops, stop{pos: offset, color: color})
+	sort.Sort(g.stops)
+}
+
+func NewLinearGradient(x0, y0, x1, y1 float64) Gradient {
+	g := &linearGradient{
+		x0: x0, y0: y0,
+		x1: x1, y1: y1,
+	}
+	return g
+}
+
+// Radial Gradient
+type circle struct {
+	x, y, r float64
+}
+
+type radialGradient struct {
+	c0, c1, cd circle
+	a, inva    float64
+	mindr      float64
+	stops      stops
+}
+
+func dot3(x0, y0, z0, x1, y1, z1 float64) float64 {
+	return x0*x1 + y0*y1 + z0*z1
+}
+
+func (g *radialGradient) ColorAt(x, y int) color.Color {
+	if len(g.stops) == 0 {
+		return color.Transparent
+	}
+
+	// copy from pixman's pixman-radial-gradient.c
+
+	dx, dy := float64(x)+0.5-g.c0.x, float64(y)+0.5-g.c0.y
+	b := dot3(dx, dy, g.c0.r, g.cd.x, g.cd.y, g.cd.r)
+	c := dot3(dx, dy, -g.c0.r, dx, dy, g.c0.r)
+
+	if g.a == 0 {
+		if b == 0 {
+			return color.Transparent
+		}
+		t := 0.5 * c / b
+		if t*g.cd.r >= g.mindr {
+			return getColor(t, g.stops)
+		}
+		return color.Transparent
+	}
+
+	discr := dot3(b, g.a, 0, b, -c, 0)
+	if discr >= 0 {
+		sqrtdiscr := math.Sqrt(discr)
+		t0 := (b + sqrtdiscr) * g.inva
+		t1 := (b - sqrtdiscr) * g.inva
+
+		if t0*g.cd.r >= g.mindr {
+			return getColor(t0, g.stops)
+		} else if t1*g.cd.r >= g.mindr {
+			return getColor(t1, g.stops)
+		}
+	}
+
+	return color.Transparent
+}
+
+func (g *radialGradient) AddColorStop(offset float64, color color.Color) {
+	g.stops = append(g.stops, stop{pos: offset, color: color})
+	sort.Sort(g.stops)
+}
+
+func NewRadialGradient(x0, y0, r0, x1, y1, r1 float64) Gradient {
+	c0 := circle{x0, y0, r0}
+	c1 := circle{x1, y1, r1}
+	cd := circle{x1 - x0, y1 - y0, r1 - r0}
+	a := dot3(cd.x, cd.y, -cd.r, cd.x, cd.y, cd.r)
+	var inva float64
+	if a != 0 {
+		inva = 1.0 / a
+	}
+	mindr := -c0.r
+	g := &radialGradient{
+		c0:    c0,
+		c1:    c1,
+		cd:    cd,
+		a:     a,
+		inva:  inva,
+		mindr: mindr,
+	}
+	return g
+}
+
+func getColor(pos float64, stops stops) color.Color {
+	if pos <= 0.0 || len(stops) == 1 {
+		return stops[0].color
+	}
+
+	last := stops[len(stops)-1]
+
+	if pos >= last.pos {
+		return last.color
+	}
+
+	for i, stop := range stops[1:] {
+		if pos < stop.pos {
+			pos = (pos - stops[i].pos) / (stop.pos - stops[i].pos)
+			return colorLerp(stops[i].color, stop.color, pos)
+		}
+	}
+
+	return last.color
+}
+
+func colorLerp(c0, c1 color.Color, t float64) color.Color {
+	r0, g0, b0, a0 := c0.RGBA()
+	r1, g1, b1, a1 := c1.RGBA()
+
+	return color.RGBA{
+		lerp(r0, r1, t),
+		lerp(g0, g1, t),
+		lerp(b0, b1, t),
+		lerp(a0, a1, t),
+	}
+}
+
+func lerp(a, b uint32, t float64) uint8 {
+	return uint8(int32(float64(a)*(1.0-t)+float64(b)*t) >> 8)
+}
diff --git a/server/vendor/github.com/fogleman/gg/matrix.go b/server/vendor/github.com/fogleman/gg/matrix.go
new file mode 100644
index 000000000..7d5b3125e
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/matrix.go
@@ -0,0 +1,88 @@
+package gg
+
+import "math"
+
+type Matrix struct {
+	XX, YX, XY, YY, X0, Y0 float64
+}
+
+func Identity() Matrix {
+	return Matrix{
+		1, 0,
+		0, 1,
+		0, 0,
+	}
+}
+
+func Translate(x, y float64) Matrix {
+	return Matrix{
+		1, 0,
+		0, 1,
+		x, y,
+	}
+}
+
+func Scale(x, y float64) Matrix {
+	return Matrix{
+		x, 0,
+		0, y,
+		0, 0,
+	}
+}
+
+func Rotate(angle float64) Matrix {
+	c := math.Cos(angle)
+	s := math.Sin(angle)
+	return Matrix{
+		c, s,
+		-s, c,
+		0, 0,
+	}
+}
+
+func Shear(x, y float64) Matrix {
+	return Matrix{
+		1, y,
+		x, 1,
+		0, 0,
+	}
+}
+
+func (a Matrix) Multiply(b Matrix) Matrix {
+	return Matrix{
+		a.XX*b.XX + a.YX*b.XY,
+		a.XX*b.YX + a.YX*b.YY,
+		a.XY*b.XX + a.YY*b.XY,
+		a.XY*b.YX + a.YY*b.YY,
+		a.X0*b.XX + a.Y0*b.XY + b.X0,
+		a.X0*b.YX + a.Y0*b.YY + b.Y0,
+	}
+}
+
+func (a Matrix) TransformVector(x, y float64) (tx, ty float64) {
+	tx = a.XX*x + a.XY*y
+	ty = a.YX*x + a.YY*y
+	return
+}
+
+func (a Matrix) TransformPoint(x, y float64) (tx, ty float64) {
+	tx = a.XX*x + a.XY*y + a.X0
+	ty = a.YX*x + a.YY*y + a.Y0
+	return
+}
+
+func (a Matrix) Translate(x, y float64) Matrix {
+	return Translate(x, y).Multiply(a)
+}
+
+func (a Matrix) Scale(x, y float64) Matrix {
+	return Scale(x, y).Multiply(a)
+}
+
+func (a Matrix) Rotate(angle float64) Matrix {
+	return Rotate(angle).Multiply(a)
+}
+
+func (a Matrix) Shear(x, y float64) Matrix {
+	return Shear(x, y).Multiply(a)
+}
diff --git a/server/vendor/github.com/fogleman/gg/path.go b/server/vendor/github.com/fogleman/gg/path.go
new file mode 100644
index 000000000..dfd3f81f9
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/path.go
@@ -0,0 +1,163 @@
+package gg
+
+import (
+	"math"
+
+	"github.com/golang/freetype/raster"
+	"golang.org/x/image/math/fixed"
+)
+
+func flattenPath(p raster.Path) [][]Point {
+	var result [][]Point
+	var path []Point
+	var cx, cy float64
+	for i := 0; i < len(p); {
+		switch p[i] {
+		case 0:
+			if len(path) > 0 {
+				result = append(result, path)
+				path = nil
+			}
+			x := unfix(p[i+1])
+			y := unfix(p[i+2])
+			path = append(path, Point{x, y})
+			cx, cy = x, y
+			i += 4
+		case 1:
+			x := unfix(p[i+1])
+			y := unfix(p[i+2])
+			path = append(path, Point{x, y})
+			cx, cy = x, y
+			i += 4
+		case 2:
+			x1 := unfix(p[i+1])
+			y1 := unfix(p[i+2])
+			x2 := unfix(p[i+3])
+			y2 := unfix(p[i+4])
+			points := QuadraticBezier(cx, cy, x1, y1, x2, y2)
+			path = append(path, points...)
+			cx, cy = x2, y2
+			i += 6
+		case 3:
+			x1 := unfix(p[i+1])
+			y1 := unfix(p[i+2])
+			x2 := unfix(p[i+3])
+			y2 := unfix(p[i+4])
+			x3 := unfix(p[i+5])
+			y3 := unfix(p[i+6])
+			points := CubicBezier(cx, cy, x1, y1, x2, y2, x3, y3)
+			path = append(path, points...)
+			cx, cy = x3, y3
+			i += 8
+		default:
+			panic("bad path")
+		}
+	}
+	if len(path) > 0 {
+		result = append(result, path)
+	}
+	return result
+}
+
+func dashPath(paths [][]Point, dashes []float64, offset float64) [][]Point {
+	var result [][]Point
+	if len(dashes) == 0 {
+		return paths
+	}
+	if len(dashes) == 1 {
+		dashes = append(dashes, dashes[0])
+	}
+	for _, path := range paths {
+		if len(path) < 2 {
+			continue
+		}
+		previous := path[0]
+		pathIndex := 1
+		dashIndex := 0
+		segmentLength := 0.0
+
+		// offset
+		if offset != 0 {
+			var totalLength float64
+			for _, dashLength := range dashes {
+				totalLength += dashLength
+			}
+			offset = math.Mod(offset, totalLength)
+			if offset < 0 {
+				offset += totalLength
+			}
+			for i, dashLength := range dashes {
+				offset -= dashLength
+				if offset < 0 {
+					dashIndex = i
+					segmentLength = dashLength + offset
+					break
+				}
+			}
+		}
+
+		var segment []Point
+		segment = append(segment, previous)
+		for pathIndex < len(path) {
+			dashLength := dashes[dashIndex]
+			point := path[pathIndex]
+			d := previous.Distance(point)
+			maxd := dashLength - segmentLength
+			if d > maxd {
+				t := maxd / d
+				p := previous.Interpolate(point, t)
+				segment = append(segment, p)
+				if dashIndex%2 == 0 && len(segment) > 1 {
+					result = append(result, segment)
+				}
+				segment = nil
+				segment = append(segment, p)
+				segmentLength = 0
+				previous = p
+				dashIndex = (dashIndex + 1) % len(dashes)
+			} else {
+				segment = append(segment, point)
+				previous = point
+				segmentLength += d
+				pathIndex++
+			}
+		}
+		if dashIndex%2 == 0 && len(segment) > 1 {
+			result = append(result, segment)
+		}
+	}
+	return result
+}
+
+func rasterPath(paths [][]Point) raster.Path {
+	var result raster.Path
+	for _, path := range paths {
+		var previous fixed.Point26_6
+		for i, point := range path {
+			f := point.Fixed()
+			if i == 0 {
+				result.Start(f)
+			} else {
+				dx := f.X - previous.X
+				dy := f.Y - previous.Y
+				if dx < 0 {
+					dx = -dx
+				}
+				if dy < 0 {
+					dy = -dy
+				}
+				if dx+dy > 8 {
+					// TODO: this is a hack for cases where two points are
+					// too close - causes rendering issues with joins / caps
+					result.Add1(f)
+				}
+			}
+			previous = f
+		}
+	}
+	return result
+}
+
+func dashed(path raster.Path, dashes []float64, offset float64) raster.Path {
+	return rasterPath(dashPath(flattenPath(path), dashes, offset))
+}
diff --git a/server/vendor/github.com/fogleman/gg/pattern.go b/server/vendor/github.com/fogleman/gg/pattern.go
new file mode 100644
index 000000000..6b396ecad
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/pattern.go
@@ -0,0 +1,123 @@
+package gg
+
+import (
+	"image"
+	"image/color"
+
+	"github.com/golang/freetype/raster"
+)
+
+type RepeatOp int
+
+const (
+	RepeatBoth RepeatOp = iota
+	RepeatX
+	RepeatY
+	RepeatNone
+)
+
+type Pattern interface {
+	ColorAt(x, y int) color.Color
+}
+
+// Solid Pattern
+type solidPattern struct {
+	color color.Color
+}
+
+func (p *solidPattern) ColorAt(x, y int) color.Color {
+	return p.color
+}
+
+func NewSolidPattern(color color.Color) Pattern {
+	return &solidPattern{color: color}
+}
+
+// Surface Pattern
+type surfacePattern struct {
+	im image.Image
+	op RepeatOp
+}
+
+func (p *surfacePattern) ColorAt(x, y int) color.Color {
+	b := p.im.Bounds()
+	switch p.op {
+	case RepeatX:
+		if y >= b.Dy() {
+			return color.Transparent
+		}
+	case RepeatY:
+		if x >= b.Dx() {
+			return color.Transparent
+		}
+	case RepeatNone:
+		if x >= b.Dx() || y >= b.Dy() {
+			return color.Transparent
+		}
+	}
+	x = x%b.Dx() + b.Min.X
+	y = y%b.Dy() + b.Min.Y
+	return p.im.At(x, y)
+}
+
+func NewSurfacePattern(im image.Image, op RepeatOp) Pattern {
+	return &surfacePattern{im: im, op: op}
+}
+
+type patternPainter struct {
+	im   *image.RGBA
+	mask *image.Alpha
+	p    Pattern
+}
+
+// Paint satisfies the Painter interface.
+func (r *patternPainter) Paint(ss []raster.Span, done bool) {
+	b := r.im.Bounds()
+	for _, s := range ss {
+		if s.Y < b.Min.Y {
+			continue
+		}
+		if s.Y >= b.Max.Y {
+			return
+		}
+		if s.X0 < b.Min.X {
+			s.X0 = b.Min.X
+		}
+		if s.X1 > b.Max.X {
+			s.X1 = b.Max.X
+		}
+		if s.X0 >= s.X1 {
+			continue
+		}
+		const m = 1<<16 - 1
+		y := s.Y - r.im.Rect.Min.Y
+		x0 := s.X0 - r.im.Rect.Min.X
+		// RGBAPainter.Paint() in $GOPATH/src/github.com/golang/freetype/raster/paint.go
+		i0 := (s.Y-r.im.Rect.Min.Y)*r.im.Stride + (s.X0-r.im.Rect.Min.X)*4
+		i1 := i0 + (s.X1-s.X0)*4
+		for i, x := i0, x0; i < i1; i, x = i+4, x+1 {
+			ma := s.Alpha
+			if r.mask != nil {
+				ma = ma * uint32(r.mask.AlphaAt(x, y).A) / 255
+				if ma == 0 {
+					continue
+				}
+			}
+			c := r.p.ColorAt(x, y)
+			cr, cg, cb, ca := c.RGBA()
+			dr := uint32(r.im.Pix[i+0])
+			dg := uint32(r.im.Pix[i+1])
+			db := uint32(r.im.Pix[i+2])
+			da := uint32(r.im.Pix[i+3])
+			a := (m - (ca * ma / m)) * 0x101
+			r.im.Pix[i+0] = uint8((dr*a + cr*ma) / m >> 8)
+			r.im.Pix[i+1] = uint8((dg*a + cg*ma) / m >> 8)
+			r.im.Pix[i+2] = uint8((db*a + cb*ma) / m >> 8)
+			r.im.Pix[i+3] = uint8((da*a + ca*ma) / m >> 8)
+		}
+	}
+}
+
+func newPatternPainter(im *image.RGBA, mask *image.Alpha, p Pattern) *patternPainter {
+	return &patternPainter{im, mask, p}
+}
diff --git a/server/vendor/github.com/fogleman/gg/point.go b/server/vendor/github.com/fogleman/gg/point.go
new file mode 100644
index 000000000..d258653cd
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/point.go
@@ -0,0 +1,25 @@
+package gg
+
+import (
+	"math"
+
+	"golang.org/x/image/math/fixed"
+)
+
+type Point struct {
+	X, Y float64
+}
+
+func (a Point) Fixed() fixed.Point26_6 {
+	return fixp(a.X, a.Y)
+}
+
+func (a Point) Distance(b Point) float64 {
+	return math.Hypot(a.X-b.X, a.Y-b.Y)
+}
+
+func (a Point) Interpolate(b Point, t float64) Point {
+	x := a.X + (b.X-a.X)*t
+	y := a.Y + (b.Y-a.Y)*t
+	return Point{x, y}
+}
diff --git a/server/vendor/github.com/fogleman/gg/util.go b/server/vendor/github.com/fogleman/gg/util.go
new file mode 100644
index 000000000..080623574
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/util.go
@@ -0,0 +1,146 @@
+package gg
+
+import (
+	"fmt"
+	"image"
+	"image/draw"
+	"image/jpeg"
+	_ "image/jpeg"
+	"image/png"
+	"io/ioutil"
+	"math"
+	"os"
+	"strings"
+
+	"github.com/golang/freetype/truetype"
+
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+func Radians(degrees float64) float64 {
+	return degrees * math.Pi / 180
+}
+
+func Degrees(radians float64) float64 {
+	return radians * 180 / math.Pi
+}
+
+func LoadImage(path string) (image.Image, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	im, _, err := image.Decode(file)
+	return im, err
+}
+
+func LoadPNG(path string) (image.Image, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	return png.Decode(file)
+}
+
+func SavePNG(path string, im image.Image) error {
+	file, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	return png.Encode(file, im)
+}
+
+func LoadJPG(path string) (image.Image, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	return jpeg.Decode(file)
+}
+
+func SaveJPG(path string, im image.Image, quality int) error {
+	file, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	var opt jpeg.Options
+	opt.Quality = quality
+
+	return jpeg.Encode(file, im, &opt)
+}
+
+func imageToRGBA(src image.Image) *image.RGBA {
+	bounds := src.Bounds()
+	dst := image.NewRGBA(bounds)
+	draw.Draw(dst, bounds, src, bounds.Min, draw.Src)
+	return dst
+}
+
+func parseHexColor(x string) (r, g, b, a int) {
+	x = strings.TrimPrefix(x, "#")
+	a = 255
+	if len(x) == 3 {
+		format := "%1x%1x%1x"
+		fmt.Sscanf(x, format, &r, &g, &b)
+		r |= r << 4
+		g |= g << 4
+		b |= b << 4
+	}
+	if len(x) == 6 {
+		format := "%02x%02x%02x"
+		fmt.Sscanf(x, format, &r, &g, &b)
+	}
+	if len(x) == 8 {
+		format := "%02x%02x%02x%02x"
+		fmt.Sscanf(x, format, &r, &g, &b, &a)
+	}
+	return
+}
+
+func fixp(x, y float64) fixed.Point26_6 {
+	return fixed.Point26_6{fix(x), fix(y)}
+}
+
+func fix(x float64) fixed.Int26_6 {
+	return fixed.Int26_6(x * 64)
+}
+
+func unfix(x fixed.Int26_6) float64 {
+	const shift, mask = 6, 1<<6 - 1
+	if x >= 0 {
+		return float64(x>>shift) + float64(x&mask)/64
+	}
+	x = -x
+	if x >= 0 {
+		return -(float64(x>>shift) + float64(x&mask)/64)
+	}
+	return 0
+}
+
+// LoadFontFace is a helper function to load the specified font file with
+// the specified point size. Note that the returned `font.Face` objects
+// are not thread safe and cannot be used in parallel across goroutines.
+// You can usually just use the Context.LoadFontFace function instead of
+// this package-level function.
+func LoadFontFace(path string, points float64) (font.Face, error) {
+	fontBytes, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	f, err := truetype.Parse(fontBytes)
+	if err != nil {
+		return nil, err
+	}
+	face := truetype.NewFace(f, &truetype.Options{
+		Size: points,
+		// Hinting: font.HintingFull,
+	})
+	return face, nil
+}
diff --git a/server/vendor/github.com/fogleman/gg/wrap.go b/server/vendor/github.com/fogleman/gg/wrap.go
new file mode 100644
index 000000000..3dfe6e1da
--- /dev/null
+++ b/server/vendor/github.com/fogleman/gg/wrap.go
@@ -0,0 +1,58 @@
+package gg
+
+import (
+	"strings"
+	"unicode"
+)
+
+type measureStringer interface {
+	MeasureString(s string) (w, h float64)
+}
+
+func splitOnSpace(x string) []string {
+	var result []string
+	pi := 0
+	ps := false
+	for i, c := range x {
+		s := unicode.IsSpace(c)
+		if s != ps && i > 0 {
+			result = append(result, x[pi:i])
+			pi = i
+		}
+		ps = s
+	}
+	result = append(result, x[pi:])
+	return result
+}
+
+func wordWrap(m measureStringer, s string, width float64) []string {
+	var result []string
+	for _, line := range strings.Split(s, "\n") {
+		fields := splitOnSpace(line)
+		if len(fields)%2 == 1 {
+			fields = append(fields, "")
+		}
+		x := ""
+		for i := 0; i < len(fields); i += 2 {
+			w, _ := m.MeasureString(x + fields[i])
+			if w > width {
+				if x == "" {
+					result = append(result, fields[i])
+					x = ""
+					continue
+				} else {
+					result = append(result, x)
+					x = ""
+				}
+			}
+			x += fields[i] + fields[i+1]
+		}
+		if x != "" {
+			result = append(result, x)
+		}
+	}
+	for i, line := range result {
+		result[i] = strings.TrimSpace(line)
+	}
+	return result
+}
diff --git a/server/vendor/github.com/golang/freetype/AUTHORS b/server/vendor/github.com/golang/freetype/AUTHORS
new file mode 100644
index 000000000..5773ac7ed
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/AUTHORS
@@ -0,0 +1,20 @@
+# This is the official list of Freetype-Go authors for copyright purposes.
+# This file is distinct from the CONTRIBUTORS files.
+# See the latter for an explanation.
+#
+# Freetype-Go is derived from Freetype, which is written in C. The latter
+# is copyright 1996-2010 David Turner, Robert Wilhelm, and Werner Lemberg.
+
+# Names should be added to this file as
+#	Name or Organization <email address>
+# The email address is not required for organizations.
+
+# Please keep the list sorted.
+
+Google Inc.
+Jeff R. Allen <jra@nella.org>
+Maksim Kochkin <maxxarts@gmail.com>
+Michael Fogleman <fogleman@gmail.com>
+Rémy Oudompheng <oudomphe@phare.normalesup.org>
+Roger Peppe <rogpeppe@gmail.com>
+Steven Edwards <steven@stephenwithav.com>
diff --git a/server/vendor/github.com/golang/freetype/CONTRIBUTORS b/server/vendor/github.com/golang/freetype/CONTRIBUTORS
new file mode 100644
index 000000000..7a1b0a278
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/CONTRIBUTORS
@@ -0,0 +1,38 @@
+# This is the official list of people who can contribute
+# (and typically have contributed) code to the Freetype-Go repository.
+# The AUTHORS file lists the copyright holders; this file
+# lists people.  For example, Google employees are listed here
+# but not in AUTHORS, because Google holds the copyright.
+#
+# The submission process automatically checks to make sure
+# that people submitting code are listed in this file (by email address).
+#
+# Names should be added to this file only after verifying that
+# the individual or the individual's organization has agreed to
+# the appropriate Contributor License Agreement, found here:
+#
+#     http://code.google.com/legal/individual-cla-v1.0.html
+#     http://code.google.com/legal/corporate-cla-v1.0.html
+#
+# The agreement for individuals can be filled out on the web.
+#
+# When adding J Random Contributor's name to this file,
+# either J's name or J's organization's name should be
+# added to the AUTHORS file, depending on whether the
+# individual or corporate CLA was used.
+
+# Names should be added to this file like so:
+#     Name <email address>
+
+# Please keep the list sorted.
+
+Andrew Gerrand <adg@golang.org>
+Jeff R. Allen <jra@nella.org> <jeff.allen@gmail.com>
+Maksim Kochkin <maxxarts@gmail.com>
+Michael Fogleman <fogleman@gmail.com>
+Nigel Tao <nigeltao@golang.org>
+Rémy Oudompheng <oudomphe@phare.normalesup.org> <remyoudompheng@gmail.com>
+Rob Pike <r@golang.org>
+Roger Peppe <rogpeppe@gmail.com>
+Russ Cox <rsc@golang.org>
+Steven Edwards <steven@stephenwithav.com>
diff --git a/server/vendor/github.com/golang/freetype/LICENSE b/server/vendor/github.com/golang/freetype/LICENSE
new file mode 100644
index 000000000..e854ba5db
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/LICENSE
@@ -0,0 +1,12 @@
+Use of the Freetype-Go software is subject to your choice of exactly one of
+the following two licenses:
+  * The FreeType License, which is similar to the original BSD license with
+    an advertising clause, or
+  * The GNU General Public License (GPL), version 2 or later.
+
+The text of these licenses are available in the licenses/ftl.txt and the
+licenses/gpl.txt files respectively. They are also available at
+http://freetype.sourceforge.net/license.html
+
+The Luxi fonts in the testdata directory are licensed separately. See the
+testdata/COPYING file for details.
diff --git a/server/vendor/github.com/golang/freetype/raster/geom.go b/server/vendor/github.com/golang/freetype/raster/geom.go
new file mode 100644
index 000000000..f3696ea98
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/raster/geom.go
@@ -0,0 +1,245 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package raster
+
+import (
+	"fmt"
+	"math"
+
+	"golang.org/x/image/math/fixed"
+)
+
+// maxAbs returns the maximum of abs(a) and abs(b).
+func maxAbs(a, b fixed.Int26_6) fixed.Int26_6 {
+	if a < 0 {
+		a = -a
+	}
+	if b < 0 {
+		b = -b
+	}
+	if a < b {
+		return b
+	}
+	return a
+}
+
+// pNeg returns the vector -p, or equivalently p rotated by 180 degrees.
+func pNeg(p fixed.Point26_6) fixed.Point26_6 {
+	return fixed.Point26_6{-p.X, -p.Y}
+}
+
+// pDot returns the dot product p·q.
+func pDot(p fixed.Point26_6, q fixed.Point26_6) fixed.Int52_12 {
+	px, py := int64(p.X), int64(p.Y)
+	qx, qy := int64(q.X), int64(q.Y)
+	return fixed.Int52_12(px*qx + py*qy)
+}
+
+// pLen returns the length of the vector p.
+func pLen(p fixed.Point26_6) fixed.Int26_6 {
+	// TODO(nigeltao): use fixed point math.
+	x := float64(p.X)
+	y := float64(p.Y)
+	return fixed.Int26_6(math.Sqrt(x*x + y*y))
+}
+
+// pNorm returns the vector p normalized to the given length, or zero if p is
+// degenerate.
+func pNorm(p fixed.Point26_6, length fixed.Int26_6) fixed.Point26_6 {
+	d := pLen(p)
+	if d == 0 {
+		return fixed.Point26_6{}
+	}
+	s, t := int64(length), int64(d)
+	x := int64(p.X) * s / t
+	y := int64(p.Y) * s / t
+	return fixed.Point26_6{fixed.Int26_6(x), fixed.Int26_6(y)}
+}
+
+// pRot45CW returns the vector p rotated clockwise by 45 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot45CW is {1/√2, 1/√2}.
+func pRot45CW(p fixed.Point26_6) fixed.Point26_6 {
+	// 181/256 is approximately 1/√2, or sin(π/4).
+	px, py := int64(p.X), int64(p.Y)
+	qx := (+px - py) * 181 / 256
+	qy := (+px + py) * 181 / 256
+	return fixed.Point26_6{fixed.Int26_6(qx), fixed.Int26_6(qy)}
+}
+
+// pRot90CW returns the vector p rotated clockwise by 90 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot90CW is {0, 1}.
+func pRot90CW(p fixed.Point26_6) fixed.Point26_6 {
+	return fixed.Point26_6{-p.Y, p.X}
+}
+
+// pRot135CW returns the vector p rotated clockwise by 135 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot135CW is {-1/√2, 1/√2}.
+func pRot135CW(p fixed.Point26_6) fixed.Point26_6 {
+	// 181/256 is approximately 1/√2, or sin(π/4).
+	px, py := int64(p.X), int64(p.Y)
+	qx := (-px - py) * 181 / 256
+	qy := (+px - py) * 181 / 256
+	return fixed.Point26_6{fixed.Int26_6(qx), fixed.Int26_6(qy)}
+}
+
+// pRot45CCW returns the vector p rotated counter-clockwise by 45 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot45CCW is {1/√2, -1/√2}.
+func pRot45CCW(p fixed.Point26_6) fixed.Point26_6 {
+	// 181/256 is approximately 1/√2, or sin(π/4).
+	px, py := int64(p.X), int64(p.Y)
+	qx := (+px + py) * 181 / 256
+	qy := (-px + py) * 181 / 256
+	return fixed.Point26_6{fixed.Int26_6(qx), fixed.Int26_6(qy)}
+}
+
+// pRot90CCW returns the vector p rotated counter-clockwise by 90 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot90CCW is {0, -1}.
+func pRot90CCW(p fixed.Point26_6) fixed.Point26_6 {
+	return fixed.Point26_6{p.Y, -p.X}
+}
+
+// pRot135CCW returns the vector p rotated counter-clockwise by 135 degrees.
+//
+// Note that the Y-axis grows downwards, so {1, 0}.Rot135CCW is {-1/√2, -1/√2}.
+func pRot135CCW(p fixed.Point26_6) fixed.Point26_6 {
+	// 181/256 is approximately 1/√2, or sin(π/4).
+	px, py := int64(p.X), int64(p.Y)
+	qx := (-px + py) * 181 / 256
+	qy := (-px - py) * 181 / 256
+	return fixed.Point26_6{fixed.Int26_6(qx), fixed.Int26_6(qy)}
+}
+
+// An Adder accumulates points on a curve.
+type Adder interface {
+	// Start starts a new curve at the given point.
+	Start(a fixed.Point26_6)
+	// Add1 adds a linear segment to the current curve.
+	Add1(b fixed.Point26_6)
+	// Add2 adds a quadratic segment to the current curve.
+	Add2(b, c fixed.Point26_6)
+	// Add3 adds a cubic segment to the current curve.
+	Add3(b, c, d fixed.Point26_6)
+}
+
+// A Path is a sequence of curves, and a curve is a start point followed by a
+// sequence of linear, quadratic or cubic segments.
+type Path []fixed.Int26_6
+
+// String returns a human-readable representation of a Path.
+func (p Path) String() string {
+	s := ""
+	for i := 0; i < len(p); {
+		if i != 0 {
+			s += " "
+		}
+		switch p[i] {
+		case 0:
+			s += "S0" + fmt.Sprint([]fixed.Int26_6(p[i+1:i+3]))
+			i += 4
+		case 1:
+			s += "A1" + fmt.Sprint([]fixed.Int26_6(p[i+1:i+3]))
+			i += 4
+		case 2:
+			s += "A2" + fmt.Sprint([]fixed.Int26_6(p[i+1:i+5]))
+			i += 6
+		case 3:
+			s += "A3" + fmt.Sprint([]fixed.Int26_6(p[i+1:i+7]))
+			i += 8
+		default:
+			panic("freetype/raster: bad path")
+		}
+	}
+	return s
+}
+
+// Clear cancels any previous calls to p.Start or p.AddXxx.
+func (p *Path) Clear() {
+	*p = (*p)[:0]
+}
+
+// Start starts a new curve at the given point.
+func (p *Path) Start(a fixed.Point26_6) {
+	*p = append(*p, 0, a.X, a.Y, 0)
+}
+
+// Add1 adds a linear segment to the current curve.
+func (p *Path) Add1(b fixed.Point26_6) {
+	*p = append(*p, 1, b.X, b.Y, 1)
+}
+
+// Add2 adds a quadratic segment to the current curve.
+func (p *Path) Add2(b, c fixed.Point26_6) {
+	*p = append(*p, 2, b.X, b.Y, c.X, c.Y, 2)
+}
+
+// Add3 adds a cubic segment to the current curve.
+func (p *Path) Add3(b, c, d fixed.Point26_6) {
+	*p = append(*p, 3, b.X, b.Y, c.X, c.Y, d.X, d.Y, 3)
+}
+
+// AddPath adds the Path q to p.
+func (p *Path) AddPath(q Path) {
+	*p = append(*p, q...)
+}
+
+// AddStroke adds a stroked Path.
+func (p *Path) AddStroke(q Path, width fixed.Int26_6, cr Capper, jr Joiner) {
+	Stroke(p, q, width, cr, jr)
+}
+
+// firstPoint returns the first point in a non-empty Path.
+func (p Path) firstPoint() fixed.Point26_6 {
+	return fixed.Point26_6{p[1], p[2]}
+}
+
+// lastPoint returns the last point in a non-empty Path.
+func (p Path) lastPoint() fixed.Point26_6 {
+	return fixed.Point26_6{p[len(p)-3], p[len(p)-2]}
+}
+
+// addPathReversed adds q reversed to p.
+// For example, if q consists of a linear segment from A to B followed by a
+// quadratic segment from B to C to D, then the values of q looks like:
+// index: 01234567890123
+// value: 0AA01BB12CCDD2
+// So, when adding q backwards to p, we want to Add2(C, B) followed by Add1(A).
+func addPathReversed(p Adder, q Path) {
+	if len(q) == 0 {
+		return
+	}
+	i := len(q) - 1
+	for {
+		switch q[i] {
+		case 0:
+			return
+		case 1:
+			i -= 4
+			p.Add1(
+				fixed.Point26_6{q[i-2], q[i-1]},
+			)
+		case 2:
+			i -= 6
+			p.Add2(
+				fixed.Point26_6{q[i+2], q[i+3]},
+				fixed.Point26_6{q[i-2], q[i-1]},
+			)
+		case 3:
+			i -= 8
+			p.Add3(
+				fixed.Point26_6{q[i+4], q[i+5]},
+				fixed.Point26_6{q[i+2], q[i+3]},
+				fixed.Point26_6{q[i-2], q[i-1]},
+			)
+		default:
+			panic("freetype/raster: bad path")
+		}
+	}
+}
diff --git a/server/vendor/github.com/golang/freetype/raster/paint.go b/server/vendor/github.com/golang/freetype/raster/paint.go
new file mode 100644
index 000000000..652256cca
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/raster/paint.go
@@ -0,0 +1,287 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package raster
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+	"math"
+)
+
+// A Span is a horizontal segment of pixels with constant alpha. X0 is an
+// inclusive bound and X1 is exclusive, the same as for slices. A fully opaque
+// Span has Alpha == 0xffff.
+type Span struct {
+	Y, X0, X1 int
+	Alpha     uint32
+}
+
+// A Painter knows how to paint a batch of Spans. Rasterization may involve
+// Painting multiple batches, and done will be true for the final batch. The
+// Spans' Y values are monotonically increasing during a rasterization. Paint
+// may use all of ss as scratch space during the call.
+type Painter interface {
+	Paint(ss []Span, done bool)
+}
+
+// The PainterFunc type adapts an ordinary function to the Painter interface.
+type PainterFunc func(ss []Span, done bool)
+
+// Paint just delegates the call to f.
+func (f PainterFunc) Paint(ss []Span, done bool) { f(ss, done) }
+
+// An AlphaOverPainter is a Painter that paints Spans onto a *image.Alpha using
+// the Over Porter-Duff composition operator.
+type AlphaOverPainter struct {
+	Image *image.Alpha
+}
+
+// Paint satisfies the Painter interface.
+func (r AlphaOverPainter) Paint(ss []Span, done bool) {
+	b := r.Image.Bounds()
+	for _, s := range ss {
+		if s.Y < b.Min.Y {
+			continue
+		}
+		if s.Y >= b.Max.Y {
+			return
+		}
+		if s.X0 < b.Min.X {
+			s.X0 = b.Min.X
+		}
+		if s.X1 > b.Max.X {
+			s.X1 = b.Max.X
+		}
+		if s.X0 >= s.X1 {
+			continue
+		}
+		base := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride - r.Image.Rect.Min.X
+		p := r.Image.Pix[base+s.X0 : base+s.X1]
+		a := int(s.Alpha >> 8)
+		for i, c := range p {
+			v := int(c)
+			p[i] = uint8((v*255 + (255-v)*a) / 255)
+		}
+	}
+}
+
+// NewAlphaOverPainter creates a new AlphaOverPainter for the given image.
+func NewAlphaOverPainter(m *image.Alpha) AlphaOverPainter {
+	return AlphaOverPainter{m}
+}
+
+// An AlphaSrcPainter is a Painter that paints Spans onto a *image.Alpha using
+// the Src Porter-Duff composition operator.
+type AlphaSrcPainter struct {
+	Image *image.Alpha
+}
+
+// Paint satisfies the Painter interface.
+func (r AlphaSrcPainter) Paint(ss []Span, done bool) {
+	b := r.Image.Bounds()
+	for _, s := range ss {
+		if s.Y < b.Min.Y {
+			continue
+		}
+		if s.Y >= b.Max.Y {
+			return
+		}
+		if s.X0 < b.Min.X {
+			s.X0 = b.Min.X
+		}
+		if s.X1 > b.Max.X {
+			s.X1 = b.Max.X
+		}
+		if s.X0 >= s.X1 {
+			continue
+		}
+		base := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride - r.Image.Rect.Min.X
+		p := r.Image.Pix[base+s.X0 : base+s.X1]
+		color := uint8(s.Alpha >> 8)
+		for i := range p {
+			p[i] = color
+		}
+	}
+}
+
+// NewAlphaSrcPainter creates a new AlphaSrcPainter for the given image.
+func NewAlphaSrcPainter(m *image.Alpha) AlphaSrcPainter {
+	return AlphaSrcPainter{m}
+}
+
+// An RGBAPainter is a Painter that paints Spans onto a *image.RGBA.
+type RGBAPainter struct {
+	// Image is the image to compose onto.
+	Image *image.RGBA
+	// Op is the Porter-Duff composition operator.
+	Op draw.Op
+	// cr, cg, cb and ca are the 16-bit color to paint the spans.
+	cr, cg, cb, ca uint32
+}
+
+// Paint satisfies the Painter interface.
+func (r *RGBAPainter) Paint(ss []Span, done bool) {
+	b := r.Image.Bounds()
+	for _, s := range ss {
+		if s.Y < b.Min.Y {
+			continue
+		}
+		if s.Y >= b.Max.Y {
+			return
+		}
+		if s.X0 < b.Min.X {
+			s.X0 = b.Min.X
+		}
+		if s.X1 > b.Max.X {
+			s.X1 = b.Max.X
+		}
+		if s.X0 >= s.X1 {
+			continue
+		}
+		// This code mimics drawGlyphOver in $GOROOT/src/image/draw/draw.go.
+		ma := s.Alpha
+		const m = 1<<16 - 1
+		i0 := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride + (s.X0-r.Image.Rect.Min.X)*4
+		i1 := i0 + (s.X1-s.X0)*4
+		if r.Op == draw.Over {
+			for i := i0; i < i1; i += 4 {
+				dr := uint32(r.Image.Pix[i+0])
+				dg := uint32(r.Image.Pix[i+1])
+				db := uint32(r.Image.Pix[i+2])
+				da := uint32(r.Image.Pix[i+3])
+				a := (m - (r.ca * ma / m)) * 0x101
+				r.Image.Pix[i+0] = uint8((dr*a + r.cr*ma) / m >> 8)
+				r.Image.Pix[i+1] = uint8((dg*a + r.cg*ma) / m >> 8)
+				r.Image.Pix[i+2] = uint8((db*a + r.cb*ma) / m >> 8)
+				r.Image.Pix[i+3] = uint8((da*a + r.ca*ma) / m >> 8)
+			}
+		} else {
+			for i := i0; i < i1; i += 4 {
+				r.Image.Pix[i+0] = uint8(r.cr * ma / m >> 8)
+				r.Image.Pix[i+1] = uint8(r.cg * ma / m >> 8)
+				r.Image.Pix[i+2] = uint8(r.cb * ma / m >> 8)
+				r.Image.Pix[i+3] = uint8(r.ca * ma / m >> 8)
+			}
+		}
+	}
+}
+
+// SetColor sets the color to paint the spans.
+func (r *RGBAPainter) SetColor(c color.Color) {
+	r.cr, r.cg, r.cb, r.ca = c.RGBA()
+}
+
+// NewRGBAPainter creates a new RGBAPainter for the given image.
+func NewRGBAPainter(m *image.RGBA) *RGBAPainter {
+	return &RGBAPainter{Image: m}
+}
+
+// A MonochromePainter wraps another Painter, quantizing each Span's alpha to
+// be either fully opaque or fully transparent.
+type MonochromePainter struct {
+	Painter   Painter
+	y, x0, x1 int
+}
+
+// Paint delegates to the wrapped Painter after quantizing each Span's alpha
+// value and merging adjacent fully opaque Spans.
+func (m *MonochromePainter) Paint(ss []Span, done bool) {
+	// We compact the ss slice, discarding any Spans whose alpha quantizes to zero.
+	j := 0
+	for _, s := range ss {
+		if s.Alpha >= 0x8000 {
+			if m.y == s.Y && m.x1 == s.X0 {
+				m.x1 = s.X1
+			} else {
+				ss[j] = Span{m.y, m.x0, m.x1, 1<<16 - 1}
+				j++
+				m.y, m.x0, m.x1 = s.Y, s.X0, s.X1
+			}
+		}
+	}
+	if done {
+		// Flush the accumulated Span.
+		finalSpan := Span{m.y, m.x0, m.x1, 1<<16 - 1}
+		if j < len(ss) {
+			ss[j] = finalSpan
+			j++
+			m.Painter.Paint(ss[:j], true)
+		} else if j == len(ss) {
+			m.Painter.Paint(ss, false)
+			if cap(ss) > 0 {
+				ss = ss[:1]
+			} else {
+				ss = make([]Span, 1)
+			}
+			ss[0] = finalSpan
+			m.Painter.Paint(ss, true)
+		} else {
+			panic("unreachable")
+		}
+		// Reset the accumulator, so that this Painter can be re-used.
+		m.y, m.x0, m.x1 = 0, 0, 0
+	} else {
+		m.Painter.Paint(ss[:j], false)
+	}
+}
+
+// NewMonochromePainter creates a new MonochromePainter that wraps the given
+// Painter.
+func NewMonochromePainter(p Painter) *MonochromePainter {
+	return &MonochromePainter{Painter: p}
+}
+
+// A GammaCorrectionPainter wraps another Painter, performing gamma-correction
+// on each Span's alpha value.
+type GammaCorrectionPainter struct {
+	// Painter is the wrapped Painter.
+	Painter Painter
+	// a is the precomputed alpha values for linear interpolation, with fully
+	// opaque == 0xffff.
+	a [256]uint16
+	// gammaIsOne is whether gamma correction is a no-op.
+	gammaIsOne bool
+}
+
+// Paint delegates to the wrapped Painter after performing gamma-correction on
+// each Span.
+func (g *GammaCorrectionPainter) Paint(ss []Span, done bool) {
+	if !g.gammaIsOne {
+		const n = 0x101
+		for i, s := range ss {
+			if s.Alpha == 0 || s.Alpha == 0xffff {
+				continue
+			}
+			p, q := s.Alpha/n, s.Alpha%n
+			// The resultant alpha is a linear interpolation of g.a[p] and g.a[p+1].
+			a := uint32(g.a[p])*(n-q) + uint32(g.a[p+1])*q
+			ss[i].Alpha = (a + n/2) / n
+		}
+	}
+	g.Painter.Paint(ss, done)
+}
+
+// SetGamma sets the gamma value.
+func (g *GammaCorrectionPainter) SetGamma(gamma float64) {
+	g.gammaIsOne = gamma == 1
+	if g.gammaIsOne {
+		return
+	}
+	for i := 0; i < 256; i++ {
+		a := float64(i) / 0xff
+		a = math.Pow(a, gamma)
+		g.a[i] = uint16(0xffff * a)
+	}
+}
+
+// NewGammaCorrectionPainter creates a new GammaCorrectionPainter that wraps
+// the given Painter.
+func NewGammaCorrectionPainter(p Painter, gamma float64) *GammaCorrectionPainter {
+	g := &GammaCorrectionPainter{Painter: p}
+	g.SetGamma(gamma)
+	return g
+}
diff --git a/server/vendor/github.com/golang/freetype/raster/raster.go b/server/vendor/github.com/golang/freetype/raster/raster.go
new file mode 100644
index 000000000..7e6cd4e2b
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/raster/raster.go
@@ -0,0 +1,601 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// Package raster provides an anti-aliasing 2-D rasterizer.
+//
+// It is part of the larger Freetype suite of font-related packages, but the
+// raster package is not specific to font rasterization, and can be used
+// standalone without any other Freetype package.
+//
+// Rasterization is done by the same area/coverage accumulation algorithm as
+// the Freetype "smooth" module, and the Anti-Grain Geometry library. A
+// description of the area/coverage algorithm is at
+// http://projects.tuxee.net/cl-vectors/section-the-cl-aa-algorithm
+package raster // import "github.com/golang/freetype/raster"
+
+import (
+	"strconv"
+
+	"golang.org/x/image/math/fixed"
+)
+
+// A cell is part of a linked list (for a given yi co-ordinate) of accumulated
+// area/coverage for the pixel at (xi, yi).
+type cell struct {
+	xi          int
+	area, cover int
+	next        int
+}
+
+type Rasterizer struct {
+	// If false, the default behavior is to use the even-odd winding fill
+	// rule during Rasterize.
+	UseNonZeroWinding bool
+	// An offset (in pixels) to the painted spans.
+	Dx, Dy int
+
+	// The width of the Rasterizer. The height is implicit in len(cellIndex).
+	width int
+	// splitScaleN is the scaling factor used to determine how many times
+	// to decompose a quadratic or cubic segment into a linear approximation.
+	splitScale2, splitScale3 int
+
+	// The current pen position.
+	a fixed.Point26_6
+	// The current cell and its area/coverage being accumulated.
+	xi, yi      int
+	area, cover int
+
+	// Saved cells.
+	cell []cell
+	// Linked list of cells, one per row.
+	cellIndex []int
+	// Buffers.
+	cellBuf      [256]cell
+	cellIndexBuf [64]int
+	spanBuf      [64]Span
+}
+
+// findCell returns the index in r.cell for the cell corresponding to
+// (r.xi, r.yi). The cell is created if necessary.
+func (r *Rasterizer) findCell() int {
+	if r.yi < 0 || r.yi >= len(r.cellIndex) {
+		return -1
+	}
+	xi := r.xi
+	if xi < 0 {
+		xi = -1
+	} else if xi > r.width {
+		xi = r.width
+	}
+	i, prev := r.cellIndex[r.yi], -1
+	for i != -1 && r.cell[i].xi <= xi {
+		if r.cell[i].xi == xi {
+			return i
+		}
+		i, prev = r.cell[i].next, i
+	}
+	c := len(r.cell)
+	if c == cap(r.cell) {
+		buf := make([]cell, c, 4*c)
+		copy(buf, r.cell)
+		r.cell = buf[0 : c+1]
+	} else {
+		r.cell = r.cell[0 : c+1]
+	}
+	r.cell[c] = cell{xi, 0, 0, i}
+	if prev == -1 {
+		r.cellIndex[r.yi] = c
+	} else {
+		r.cell[prev].next = c
+	}
+	return c
+}
+
+// saveCell saves any accumulated r.area/r.cover for (r.xi, r.yi).
+func (r *Rasterizer) saveCell() {
+	if r.area != 0 || r.cover != 0 {
+		i := r.findCell()
+		if i != -1 {
+			r.cell[i].area += r.area
+			r.cell[i].cover += r.cover
+		}
+		r.area = 0
+		r.cover = 0
+	}
+}
+
+// setCell sets the (xi, yi) cell that r is accumulating area/coverage for.
+func (r *Rasterizer) setCell(xi, yi int) {
+	if r.xi != xi || r.yi != yi {
+		r.saveCell()
+		r.xi, r.yi = xi, yi
+	}
+}
+
+// scan accumulates area/coverage for the yi'th scanline, going from
+// x0 to x1 in the horizontal direction (in 26.6 fixed point co-ordinates)
+// and from y0f to y1f fractional vertical units within that scanline.
+func (r *Rasterizer) scan(yi int, x0, y0f, x1, y1f fixed.Int26_6) {
+	// Break the 26.6 fixed point X co-ordinates into integral and fractional parts.
+	x0i := int(x0) / 64
+	x0f := x0 - fixed.Int26_6(64*x0i)
+	x1i := int(x1) / 64
+	x1f := x1 - fixed.Int26_6(64*x1i)
+
+	// A perfectly horizontal scan.
+	if y0f == y1f {
+		r.setCell(x1i, yi)
+		return
+	}
+	dx, dy := x1-x0, y1f-y0f
+	// A single cell scan.
+	if x0i == x1i {
+		r.area += int((x0f + x1f) * dy)
+		r.cover += int(dy)
+		return
+	}
+	// There are at least two cells. Apart from the first and last cells,
+	// all intermediate cells go through the full width of the cell,
+	// or 64 units in 26.6 fixed point format.
+	var (
+		p, q, edge0, edge1 fixed.Int26_6
+		xiDelta            int
+	)
+	if dx > 0 {
+		p, q = (64-x0f)*dy, dx
+		edge0, edge1, xiDelta = 0, 64, 1
+	} else {
+		p, q = x0f*dy, -dx
+		edge0, edge1, xiDelta = 64, 0, -1
+	}
+	yDelta, yRem := p/q, p%q
+	if yRem < 0 {
+		yDelta -= 1
+		yRem += q
+	}
+	// Do the first cell.
+	xi, y := x0i, y0f
+	r.area += int((x0f + edge1) * yDelta)
+	r.cover += int(yDelta)
+	xi, y = xi+xiDelta, y+yDelta
+	r.setCell(xi, yi)
+	if xi != x1i {
+		// Do all the intermediate cells.
+		p = 64 * (y1f - y + yDelta)
+		fullDelta, fullRem := p/q, p%q
+		if fullRem < 0 {
+			fullDelta -= 1
+			fullRem += q
+		}
+		yRem -= q
+		for xi != x1i {
+			yDelta = fullDelta
+			yRem += fullRem
+			if yRem >= 0 {
+				yDelta += 1
+				yRem -= q
+			}
+			r.area += int(64 * yDelta)
+			r.cover += int(yDelta)
+			xi, y = xi+xiDelta, y+yDelta
+			r.setCell(xi, yi)
+		}
+	}
+	// Do the last cell.
+	yDelta = y1f - y
+	r.area += int((edge0 + x1f) * yDelta)
+	r.cover += int(yDelta)
+}
+
+// Start starts a new curve at the given point.
+func (r *Rasterizer) Start(a fixed.Point26_6) {
+	r.setCell(int(a.X/64), int(a.Y/64))
+	r.a = a
+}
+
+// Add1 adds a linear segment to the current curve.
+func (r *Rasterizer) Add1(b fixed.Point26_6) {
+	x0, y0 := r.a.X, r.a.Y
+	x1, y1 := b.X, b.Y
+	dx, dy := x1-x0, y1-y0
+	// Break the 26.6 fixed point Y co-ordinates into integral and fractional
+	// parts.
+	y0i := int(y0) / 64
+	y0f := y0 - fixed.Int26_6(64*y0i)
+	y1i := int(y1) / 64
+	y1f := y1 - fixed.Int26_6(64*y1i)
+
+	if y0i == y1i {
+		// There is only one scanline.
+		r.scan(y0i, x0, y0f, x1, y1f)
+
+	} else if dx == 0 {
+		// This is a vertical line segment. We avoid calling r.scan and instead
+		// manipulate r.area and r.cover directly.
+		var (
+			edge0, edge1 fixed.Int26_6
+			yiDelta      int
+		)
+		if dy > 0 {
+			edge0, edge1, yiDelta = 0, 64, 1
+		} else {
+			edge0, edge1, yiDelta = 64, 0, -1
+		}
+		x0i, yi := int(x0)/64, y0i
+		x0fTimes2 := (int(x0) - (64 * x0i)) * 2
+		// Do the first pixel.
+		dcover := int(edge1 - y0f)
+		darea := int(x0fTimes2 * dcover)
+		r.area += darea
+		r.cover += dcover
+		yi += yiDelta
+		r.setCell(x0i, yi)
+		// Do all the intermediate pixels.
+		dcover = int(edge1 - edge0)
+		darea = int(x0fTimes2 * dcover)
+		for yi != y1i {
+			r.area += darea
+			r.cover += dcover
+			yi += yiDelta
+			r.setCell(x0i, yi)
+		}
+		// Do the last pixel.
+		dcover = int(y1f - edge0)
+		darea = int(x0fTimes2 * dcover)
+		r.area += darea
+		r.cover += dcover
+
+	} else {
+		// There are at least two scanlines. Apart from the first and last
+		// scanlines, all intermediate scanlines go through the full height of
+		// the row, or 64 units in 26.6 fixed point format.
+		var (
+			p, q, edge0, edge1 fixed.Int26_6
+			yiDelta            int
+		)
+		if dy > 0 {
+			p, q = (64-y0f)*dx, dy
+			edge0, edge1, yiDelta = 0, 64, 1
+		} else {
+			p, q = y0f*dx, -dy
+			edge0, edge1, yiDelta = 64, 0, -1
+		}
+		xDelta, xRem := p/q, p%q
+		if xRem < 0 {
+			xDelta -= 1
+			xRem += q
+		}
+		// Do the first scanline.
+		x, yi := x0, y0i
+		r.scan(yi, x, y0f, x+xDelta, edge1)
+		x, yi = x+xDelta, yi+yiDelta
+		r.setCell(int(x)/64, yi)
+		if yi != y1i {
+			// Do all the intermediate scanlines.
+			p = 64 * dx
+			fullDelta, fullRem := p/q, p%q
+			if fullRem < 0 {
+				fullDelta -= 1
+				fullRem += q
+			}
+			xRem -= q
+			for yi != y1i {
+				xDelta = fullDelta
+				xRem += fullRem
+				if xRem >= 0 {
+					xDelta += 1
+					xRem -= q
+				}
+				r.scan(yi, x, edge0, x+xDelta, edge1)
+				x, yi = x+xDelta, yi+yiDelta
+				r.setCell(int(x)/64, yi)
+			}
+		}
+		// Do the last scanline.
+		r.scan(yi, x, edge0, x1, y1f)
+	}
+	// The next lineTo starts from b.
+	r.a = b
+}
+
+// Add2 adds a quadratic segment to the current curve.
+func (r *Rasterizer) Add2(b, c fixed.Point26_6) {
+	// Calculate nSplit (the number of recursive decompositions) based on how
+	// 'curvy' it is. Specifically, how much the middle point b deviates from
+	// (a+c)/2.
+	dev := maxAbs(r.a.X-2*b.X+c.X, r.a.Y-2*b.Y+c.Y) / fixed.Int26_6(r.splitScale2)
+	nsplit := 0
+	for dev > 0 {
+		dev /= 4
+		nsplit++
+	}
+	// dev is 32-bit, and nsplit++ every time we shift off 2 bits, so maxNsplit
+	// is 16.
+	const maxNsplit = 16
+	if nsplit > maxNsplit {
+		panic("freetype/raster: Add2 nsplit too large: " + strconv.Itoa(nsplit))
+	}
+	// Recursively decompose the curve nSplit levels deep.
+	var (
+		pStack [2*maxNsplit + 3]fixed.Point26_6
+		sStack [maxNsplit + 1]int
+		i      int
+	)
+	sStack[0] = nsplit
+	pStack[0] = c
+	pStack[1] = b
+	pStack[2] = r.a
+	for i >= 0 {
+		s := sStack[i]
+		p := pStack[2*i:]
+		if s > 0 {
+			// Split the quadratic curve p[:3] into an equivalent set of two
+			// shorter curves: p[:3] and p[2:5]. The new p[4] is the old p[2],
+			// and p[0] is unchanged.
+			mx := p[1].X
+			p[4].X = p[2].X
+			p[3].X = (p[4].X + mx) / 2
+			p[1].X = (p[0].X + mx) / 2
+			p[2].X = (p[1].X + p[3].X) / 2
+			my := p[1].Y
+			p[4].Y = p[2].Y
+			p[3].Y = (p[4].Y + my) / 2
+			p[1].Y = (p[0].Y + my) / 2
+			p[2].Y = (p[1].Y + p[3].Y) / 2
+			// The two shorter curves have one less split to do.
+			sStack[i] = s - 1
+			sStack[i+1] = s - 1
+			i++
+		} else {
+			// Replace the level-0 quadratic with a two-linear-piece
+			// approximation.
+			midx := (p[0].X + 2*p[1].X + p[2].X) / 4
+			midy := (p[0].Y + 2*p[1].Y + p[2].Y) / 4
+			r.Add1(fixed.Point26_6{midx, midy})
+			r.Add1(p[0])
+			i--
+		}
+	}
+}
+
+// Add3 adds a cubic segment to the current curve.
+func (r *Rasterizer) Add3(b, c, d fixed.Point26_6) {
+	// Calculate nSplit (the number of recursive decompositions) based on how
+	// 'curvy' it is.
+	dev2 := maxAbs(r.a.X-3*(b.X+c.X)+d.X, r.a.Y-3*(b.Y+c.Y)+d.Y) / fixed.Int26_6(r.splitScale2)
+	dev3 := maxAbs(r.a.X-2*b.X+d.X, r.a.Y-2*b.Y+d.Y) / fixed.Int26_6(r.splitScale3)
+	nsplit := 0
+	for dev2 > 0 || dev3 > 0 {
+		dev2 /= 8
+		dev3 /= 4
+		nsplit++
+	}
+	// devN is 32-bit, and nsplit++ every time we shift off 2 bits, so
+	// maxNsplit is 16.
+	const maxNsplit = 16
+	if nsplit > maxNsplit {
+		panic("freetype/raster: Add3 nsplit too large: " + strconv.Itoa(nsplit))
+	}
+	// Recursively decompose the curve nSplit levels deep.
+	var (
+		pStack [3*maxNsplit + 4]fixed.Point26_6
+		sStack [maxNsplit + 1]int
+		i      int
+	)
+	sStack[0] = nsplit
+	pStack[0] = d
+	pStack[1] = c
+	pStack[2] = b
+	pStack[3] = r.a
+	for i >= 0 {
+		s := sStack[i]
+		p := pStack[3*i:]
+		if s > 0 {
+			// Split the cubic curve p[:4] into an equivalent set of two
+			// shorter curves: p[:4] and p[3:7]. The new p[6] is the old p[3],
+			// and p[0] is unchanged.
+			m01x := (p[0].X + p[1].X) / 2
+			m12x := (p[1].X + p[2].X) / 2
+			m23x := (p[2].X + p[3].X) / 2
+			p[6].X = p[3].X
+			p[5].X = m23x
+			p[1].X = m01x
+			p[2].X = (m01x + m12x) / 2
+			p[4].X = (m12x + m23x) / 2
+			p[3].X = (p[2].X + p[4].X) / 2
+			m01y := (p[0].Y + p[1].Y) / 2
+			m12y := (p[1].Y + p[2].Y) / 2
+			m23y := (p[2].Y + p[3].Y) / 2
+			p[6].Y = p[3].Y
+			p[5].Y = m23y
+			p[1].Y = m01y
+			p[2].Y = (m01y + m12y) / 2
+			p[4].Y = (m12y + m23y) / 2
+			p[3].Y = (p[2].Y + p[4].Y) / 2
+			// The two shorter curves have one less split to do.
+			sStack[i] = s - 1
+			sStack[i+1] = s - 1
+			i++
+		} else {
+			// Replace the level-0 cubic with a two-linear-piece approximation.
+			midx := (p[0].X + 3*(p[1].X+p[2].X) + p[3].X) / 8
+			midy := (p[0].Y + 3*(p[1].Y+p[2].Y) + p[3].Y) / 8
+			r.Add1(fixed.Point26_6{midx, midy})
+			r.Add1(p[0])
+			i--
+		}
+	}
+}
+
+// AddPath adds the given Path.
+func (r *Rasterizer) AddPath(p Path) {
+	for i := 0; i < len(p); {
+		switch p[i] {
+		case 0:
+			r.Start(
+				fixed.Point26_6{p[i+1], p[i+2]},
+			)
+			i += 4
+		case 1:
+			r.Add1(
+				fixed.Point26_6{p[i+1], p[i+2]},
+			)
+			i += 4
+		case 2:
+			r.Add2(
+				fixed.Point26_6{p[i+1], p[i+2]},
+				fixed.Point26_6{p[i+3], p[i+4]},
+			)
+			i += 6
+		case 3:
+			r.Add3(
+				fixed.Point26_6{p[i+1], p[i+2]},
+				fixed.Point26_6{p[i+3], p[i+4]},
+				fixed.Point26_6{p[i+5], p[i+6]},
+			)
+			i += 8
+		default:
+			panic("freetype/raster: bad path")
+		}
+	}
+}
+
+// AddStroke adds a stroked Path.
+func (r *Rasterizer) AddStroke(q Path, width fixed.Int26_6, cr Capper, jr Joiner) {
+	Stroke(r, q, width, cr, jr)
+}
+
+// areaToAlpha converts an area value to a uint32 alpha value. A completely
+// filled pixel corresponds to an area of 64*64*2, and an alpha of 0xffff. The
+// conversion of area values greater than this depends on the winding rule:
+// even-odd or non-zero.
+func (r *Rasterizer) areaToAlpha(area int) uint32 {
+	// The C Freetype implementation (version 2.3.12) does "alpha := area>>1"
+	// without the +1. Round-to-nearest gives a more symmetric result than
+	// round-down. The C implementation also returns 8-bit alpha, not 16-bit
+	// alpha.
+	a := (area + 1) >> 1
+	if a < 0 {
+		a = -a
+	}
+	alpha := uint32(a)
+	if r.UseNonZeroWinding {
+		if alpha > 0x0fff {
+			alpha = 0x0fff
+		}
+	} else {
+		alpha &= 0x1fff
+		if alpha > 0x1000 {
+			alpha = 0x2000 - alpha
+		} else if alpha == 0x1000 {
+			alpha = 0x0fff
+		}
+	}
+	// alpha is now in the range [0x0000, 0x0fff]. Convert that 12-bit alpha to
+	// 16-bit alpha.
+	return alpha<<4 | alpha>>8
+}
+
+// Rasterize converts r's accumulated curves into Spans for p. The Spans passed
+// to p are non-overlapping, and sorted by Y and then X. They all have non-zero
+// width (and 0 <= X0 < X1 <= r.width) and non-zero A, except for the final
+// Span, which has Y, X0, X1 and A all equal to zero.
+func (r *Rasterizer) Rasterize(p Painter) {
+	r.saveCell()
+	s := 0
+	for yi := 0; yi < len(r.cellIndex); yi++ {
+		xi, cover := 0, 0
+		for c := r.cellIndex[yi]; c != -1; c = r.cell[c].next {
+			if cover != 0 && r.cell[c].xi > xi {
+				alpha := r.areaToAlpha(cover * 64 * 2)
+				if alpha != 0 {
+					xi0, xi1 := xi, r.cell[c].xi
+					if xi0 < 0 {
+						xi0 = 0
+					}
+					if xi1 >= r.width {
+						xi1 = r.width
+					}
+					if xi0 < xi1 {
+						r.spanBuf[s] = Span{yi + r.Dy, xi0 + r.Dx, xi1 + r.Dx, alpha}
+						s++
+					}
+				}
+			}
+			cover += r.cell[c].cover
+			alpha := r.areaToAlpha(cover*64*2 - r.cell[c].area)
+			xi = r.cell[c].xi + 1
+			if alpha != 0 {
+				xi0, xi1 := r.cell[c].xi, xi
+				if xi0 < 0 {
+					xi0 = 0
+				}
+				if xi1 >= r.width {
+					xi1 = r.width
+				}
+				if xi0 < xi1 {
+					r.spanBuf[s] = Span{yi + r.Dy, xi0 + r.Dx, xi1 + r.Dx, alpha}
+					s++
+				}
+			}
+			if s > len(r.spanBuf)-2 {
+				p.Paint(r.spanBuf[:s], false)
+				s = 0
+			}
+		}
+	}
+	p.Paint(r.spanBuf[:s], true)
+}
+
+// Clear cancels any previous calls to r.Start or r.AddXxx.
+func (r *Rasterizer) Clear() {
+	r.a = fixed.Point26_6{}
+	r.xi = 0
+	r.yi = 0
+	r.area = 0
+	r.cover = 0
+	r.cell = r.cell[:0]
+	for i := 0; i < len(r.cellIndex); i++ {
+		r.cellIndex[i] = -1
+	}
+}
+
+// SetBounds sets the maximum width and height of the rasterized image and
+// calls Clear. The width and height are in pixels, not fixed.Int26_6 units.
+func (r *Rasterizer) SetBounds(width, height int) {
+	if width < 0 {
+		width = 0
+	}
+	if height < 0 {
+		height = 0
+	}
+	// Use the same ssN heuristic as the C Freetype (version 2.4.0)
+	// implementation.
+	ss2, ss3 := 32, 16
+	if width > 24 || height > 24 {
+		ss2, ss3 = 2*ss2, 2*ss3
+		if width > 120 || height > 120 {
+			ss2, ss3 = 2*ss2, 2*ss3
+		}
+	}
+	r.width = width
+	r.splitScale2 = ss2
+	r.splitScale3 = ss3
+	r.cell = r.cellBuf[:0]
+	if height > len(r.cellIndexBuf) {
+		r.cellIndex = make([]int, height)
+	} else {
+		r.cellIndex = r.cellIndexBuf[:height]
+	}
+	r.Clear()
+}
+
+// NewRasterizer creates a new Rasterizer with the given bounds.
+func NewRasterizer(width, height int) *Rasterizer {
+	r := new(Rasterizer)
+	r.SetBounds(width, height)
+	return r
+}
diff --git a/server/vendor/github.com/golang/freetype/raster/stroke.go b/server/vendor/github.com/golang/freetype/raster/stroke.go
new file mode 100644
index 000000000..bcc66b268
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/raster/stroke.go
@@ -0,0 +1,483 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package raster
+
+import (
+	"golang.org/x/image/math/fixed"
+)
+
+// Two points are considered practically equal if the square of the distance
+// between them is less than one quarter (i.e. 1024 / 4096).
+const epsilon = fixed.Int52_12(1024)
+
+// A Capper signifies how to begin or end a stroked path.
+type Capper interface {
+	// Cap adds a cap to p given a pivot point and the normal vector of a
+	// terminal segment. The normal's length is half of the stroke width.
+	Cap(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6)
+}
+
+// The CapperFunc type adapts an ordinary function to be a Capper.
+type CapperFunc func(Adder, fixed.Int26_6, fixed.Point26_6, fixed.Point26_6)
+
+func (f CapperFunc) Cap(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6) {
+	f(p, halfWidth, pivot, n1)
+}
+
+// A Joiner signifies how to join interior nodes of a stroked path.
+type Joiner interface {
+	// Join adds a join to the two sides of a stroked path given a pivot
+	// point and the normal vectors of the trailing and leading segments.
+	// Both normals have length equal to half of the stroke width.
+	Join(lhs, rhs Adder, halfWidth fixed.Int26_6, pivot, n0, n1 fixed.Point26_6)
+}
+
+// The JoinerFunc type adapts an ordinary function to be a Joiner.
+type JoinerFunc func(lhs, rhs Adder, halfWidth fixed.Int26_6, pivot, n0, n1 fixed.Point26_6)
+
+func (f JoinerFunc) Join(lhs, rhs Adder, halfWidth fixed.Int26_6, pivot, n0, n1 fixed.Point26_6) {
+	f(lhs, rhs, halfWidth, pivot, n0, n1)
+}
+
+// RoundCapper adds round caps to a stroked path.
+var RoundCapper Capper = CapperFunc(roundCapper)
+
+func roundCapper(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6) {
+	// The cubic Bézier approximation to a circle involves the magic number
+	// (√2 - 1) * 4/3, which is approximately 35/64.
+	const k = 35
+	e := pRot90CCW(n1)
+	side := pivot.Add(e)
+	start, end := pivot.Sub(n1), pivot.Add(n1)
+	d, e := n1.Mul(k), e.Mul(k)
+	p.Add3(start.Add(e), side.Sub(d), side)
+	p.Add3(side.Add(d), end.Add(e), end)
+}
+
+// ButtCapper adds butt caps to a stroked path.
+var ButtCapper Capper = CapperFunc(buttCapper)
+
+func buttCapper(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6) {
+	p.Add1(pivot.Add(n1))
+}
+
+// SquareCapper adds square caps to a stroked path.
+var SquareCapper Capper = CapperFunc(squareCapper)
+
+func squareCapper(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6) {
+	e := pRot90CCW(n1)
+	side := pivot.Add(e)
+	p.Add1(side.Sub(n1))
+	p.Add1(side.Add(n1))
+	p.Add1(pivot.Add(n1))
+}
+
+// RoundJoiner adds round joins to a stroked path.
+var RoundJoiner Joiner = JoinerFunc(roundJoiner)
+
+func roundJoiner(lhs, rhs Adder, haflWidth fixed.Int26_6, pivot, n0, n1 fixed.Point26_6) {
+	dot := pDot(pRot90CW(n0), n1)
+	if dot >= 0 {
+		addArc(lhs, pivot, n0, n1)
+		rhs.Add1(pivot.Sub(n1))
+	} else {
+		lhs.Add1(pivot.Add(n1))
+		addArc(rhs, pivot, pNeg(n0), pNeg(n1))
+	}
+}
+
+// BevelJoiner adds bevel joins to a stroked path.
+var BevelJoiner Joiner = JoinerFunc(bevelJoiner)
+
+func bevelJoiner(lhs, rhs Adder, haflWidth fixed.Int26_6, pivot, n0, n1 fixed.Point26_6) {
+	lhs.Add1(pivot.Add(n1))
+	rhs.Add1(pivot.Sub(n1))
+}
+
+// addArc adds a circular arc from pivot+n0 to pivot+n1 to p. The shorter of
+// the two possible arcs is taken, i.e. the one spanning <= 180 degrees. The
+// two vectors n0 and n1 must be of equal length.
+func addArc(p Adder, pivot, n0, n1 fixed.Point26_6) {
+	// r2 is the square of the length of n0.
+	r2 := pDot(n0, n0)
+	if r2 < epsilon {
+		// The arc radius is so small that we collapse to a straight line.
+		p.Add1(pivot.Add(n1))
+		return
+	}
+	// We approximate the arc by 0, 1, 2 or 3 45-degree quadratic segments plus
+	// a final quadratic segment from s to n1. Each 45-degree segment has
+	// control points {1, 0}, {1, tan(π/8)} and {1/√2, 1/√2} suitably scaled,
+	// rotated and translated. tan(π/8) is approximately 27/64.
+	const tpo8 = 27
+	var s fixed.Point26_6
+	// We determine which octant the angle between n0 and n1 is in via three
+	// dot products. m0, m1 and m2 are n0 rotated clockwise by 45, 90 and 135
+	// degrees.
+	m0 := pRot45CW(n0)
+	m1 := pRot90CW(n0)
+	m2 := pRot90CW(m0)
+	if pDot(m1, n1) >= 0 {
+		if pDot(n0, n1) >= 0 {
+			if pDot(m2, n1) <= 0 {
+				// n1 is between 0 and 45 degrees clockwise of n0.
+				s = n0
+			} else {
+				// n1 is between 45 and 90 degrees clockwise of n0.
+				p.Add2(pivot.Add(n0).Add(m1.Mul(tpo8)), pivot.Add(m0))
+				s = m0
+			}
+		} else {
+			pm1, n0t := pivot.Add(m1), n0.Mul(tpo8)
+			p.Add2(pivot.Add(n0).Add(m1.Mul(tpo8)), pivot.Add(m0))
+			p.Add2(pm1.Add(n0t), pm1)
+			if pDot(m0, n1) >= 0 {
+				// n1 is between 90 and 135 degrees clockwise of n0.
+				s = m1
+			} else {
+				// n1 is between 135 and 180 degrees clockwise of n0.
+				p.Add2(pm1.Sub(n0t), pivot.Add(m2))
+				s = m2
+			}
+		}
+	} else {
+		if pDot(n0, n1) >= 0 {
+			if pDot(m0, n1) >= 0 {
+				// n1 is between 0 and 45 degrees counter-clockwise of n0.
+				s = n0
+			} else {
+				// n1 is between 45 and 90 degrees counter-clockwise of n0.
+				p.Add2(pivot.Add(n0).Sub(m1.Mul(tpo8)), pivot.Sub(m2))
+				s = pNeg(m2)
+			}
+		} else {
+			pm1, n0t := pivot.Sub(m1), n0.Mul(tpo8)
+			p.Add2(pivot.Add(n0).Sub(m1.Mul(tpo8)), pivot.Sub(m2))
+			p.Add2(pm1.Add(n0t), pm1)
+			if pDot(m2, n1) <= 0 {
+				// n1 is between 90 and 135 degrees counter-clockwise of n0.
+				s = pNeg(m1)
+			} else {
+				// n1 is between 135 and 180 degrees counter-clockwise of n0.
+				p.Add2(pm1.Sub(n0t), pivot.Sub(m0))
+				s = pNeg(m0)
+			}
+		}
+	}
+	// The final quadratic segment has two endpoints s and n1 and the middle
+	// control point is a multiple of s.Add(n1), i.e. it is on the angle
+	// bisector of those two points. The multiple ranges between 128/256 and
+	// 150/256 as the angle between s and n1 ranges between 0 and 45 degrees.
+	//
+	// When the angle is 0 degrees (i.e. s and n1 are coincident) then
+	// s.Add(n1) is twice s and so the middle control point of the degenerate
+	// quadratic segment should be half s.Add(n1), and half = 128/256.
+	//
+	// When the angle is 45 degrees then 150/256 is the ratio of the lengths of
+	// the two vectors {1, tan(π/8)} and {1 + 1/√2, 1/√2}.
+	//
+	// d is the normalized dot product between s and n1. Since the angle ranges
+	// between 0 and 45 degrees then d ranges between 256/256 and 181/256.
+	d := 256 * pDot(s, n1) / r2
+	multiple := fixed.Int26_6(150-(150-128)*(d-181)/(256-181)) >> 2
+	p.Add2(pivot.Add(s.Add(n1).Mul(multiple)), pivot.Add(n1))
+}
+
+// midpoint returns the midpoint of two Points.
+func midpoint(a, b fixed.Point26_6) fixed.Point26_6 {
+	return fixed.Point26_6{(a.X + b.X) / 2, (a.Y + b.Y) / 2}
+}
+
+// angleGreaterThan45 returns whether the angle between two vectors is more
+// than 45 degrees.
+func angleGreaterThan45(v0, v1 fixed.Point26_6) bool {
+	v := pRot45CCW(v0)
+	return pDot(v, v1) < 0 || pDot(pRot90CW(v), v1) < 0
+}
+
+// interpolate returns the point (1-t)*a + t*b.
+func interpolate(a, b fixed.Point26_6, t fixed.Int52_12) fixed.Point26_6 {
+	s := 1<<12 - t
+	x := s*fixed.Int52_12(a.X) + t*fixed.Int52_12(b.X)
+	y := s*fixed.Int52_12(a.Y) + t*fixed.Int52_12(b.Y)
+	return fixed.Point26_6{fixed.Int26_6(x >> 12), fixed.Int26_6(y >> 12)}
+}
+
+// curviest2 returns the value of t for which the quadratic parametric curve
+// (1-t)²*a + 2*t*(1-t).b + t²*c has maximum curvature.
+//
+// The curvature of the parametric curve f(t) = (x(t), y(t)) is
+// |x′y″-y′x″| / (x′²+y′²)^(3/2).
+//
+// Let d = b-a and e = c-2*b+a, so that f′(t) = 2*d+2*e*t and f″(t) = 2*e.
+// The curvature's numerator is (2*dx+2*ex*t)*(2*ey)-(2*dy+2*ey*t)*(2*ex),
+// which simplifies to 4*dx*ey-4*dy*ex, which is constant with respect to t.
+//
+// Thus, curvature is extreme where the denominator is extreme, i.e. where
+// (x′²+y′²) is extreme. The first order condition is that
+// 2*x′*x″+2*y′*y″ = 0, or (dx+ex*t)*ex + (dy+ey*t)*ey = 0.
+// Solving for t gives t = -(dx*ex+dy*ey) / (ex*ex+ey*ey).
+func curviest2(a, b, c fixed.Point26_6) fixed.Int52_12 {
+	dx := int64(b.X - a.X)
+	dy := int64(b.Y - a.Y)
+	ex := int64(c.X - 2*b.X + a.X)
+	ey := int64(c.Y - 2*b.Y + a.Y)
+	if ex == 0 && ey == 0 {
+		return 2048
+	}
+	return fixed.Int52_12(-4096 * (dx*ex + dy*ey) / (ex*ex + ey*ey))
+}
+
+// A stroker holds state for stroking a path.
+type stroker struct {
+	// p is the destination that records the stroked path.
+	p Adder
+	// u is the half-width of the stroke.
+	u fixed.Int26_6
+	// cr and jr specify how to end and connect path segments.
+	cr Capper
+	jr Joiner
+	// r is the reverse path. Stroking a path involves constructing two
+	// parallel paths 2*u apart. The first path is added immediately to p,
+	// the second path is accumulated in r and eventually added in reverse.
+	r Path
+	// a is the most recent segment point. anorm is the segment normal of
+	// length u at that point.
+	a, anorm fixed.Point26_6
+}
+
+// addNonCurvy2 adds a quadratic segment to the stroker, where the segment
+// defined by (k.a, b, c) achieves maximum curvature at either k.a or c.
+func (k *stroker) addNonCurvy2(b, c fixed.Point26_6) {
+	// We repeatedly divide the segment at its middle until it is straight
+	// enough to approximate the stroke by just translating the control points.
+	// ds and ps are stacks of depths and points. t is the top of the stack.
+	const maxDepth = 5
+	var (
+		ds [maxDepth + 1]int
+		ps [2*maxDepth + 3]fixed.Point26_6
+		t  int
+	)
+	// Initially the ps stack has one quadratic segment of depth zero.
+	ds[0] = 0
+	ps[2] = k.a
+	ps[1] = b
+	ps[0] = c
+	anorm := k.anorm
+	var cnorm fixed.Point26_6
+
+	for {
+		depth := ds[t]
+		a := ps[2*t+2]
+		b := ps[2*t+1]
+		c := ps[2*t+0]
+		ab := b.Sub(a)
+		bc := c.Sub(b)
+		abIsSmall := pDot(ab, ab) < fixed.Int52_12(1<<12)
+		bcIsSmall := pDot(bc, bc) < fixed.Int52_12(1<<12)
+		if abIsSmall && bcIsSmall {
+			// Approximate the segment by a circular arc.
+			cnorm = pRot90CCW(pNorm(bc, k.u))
+			mac := midpoint(a, c)
+			addArc(k.p, mac, anorm, cnorm)
+			addArc(&k.r, mac, pNeg(anorm), pNeg(cnorm))
+		} else if depth < maxDepth && angleGreaterThan45(ab, bc) {
+			// Divide the segment in two and push both halves on the stack.
+			mab := midpoint(a, b)
+			mbc := midpoint(b, c)
+			t++
+			ds[t+0] = depth + 1
+			ds[t-1] = depth + 1
+			ps[2*t+2] = a
+			ps[2*t+1] = mab
+			ps[2*t+0] = midpoint(mab, mbc)
+			ps[2*t-1] = mbc
+			continue
+		} else {
+			// Translate the control points.
+			bnorm := pRot90CCW(pNorm(c.Sub(a), k.u))
+			cnorm = pRot90CCW(pNorm(bc, k.u))
+			k.p.Add2(b.Add(bnorm), c.Add(cnorm))
+			k.r.Add2(b.Sub(bnorm), c.Sub(cnorm))
+		}
+		if t == 0 {
+			k.a, k.anorm = c, cnorm
+			return
+		}
+		t--
+		anorm = cnorm
+	}
+	panic("unreachable")
+}
+
+// Add1 adds a linear segment to the stroker.
+func (k *stroker) Add1(b fixed.Point26_6) {
+	bnorm := pRot90CCW(pNorm(b.Sub(k.a), k.u))
+	if len(k.r) == 0 {
+		k.p.Start(k.a.Add(bnorm))
+		k.r.Start(k.a.Sub(bnorm))
+	} else {
+		k.jr.Join(k.p, &k.r, k.u, k.a, k.anorm, bnorm)
+	}
+	k.p.Add1(b.Add(bnorm))
+	k.r.Add1(b.Sub(bnorm))
+	k.a, k.anorm = b, bnorm
+}
+
+// Add2 adds a quadratic segment to the stroker.
+func (k *stroker) Add2(b, c fixed.Point26_6) {
+	ab := b.Sub(k.a)
+	bc := c.Sub(b)
+	abnorm := pRot90CCW(pNorm(ab, k.u))
+	if len(k.r) == 0 {
+		k.p.Start(k.a.Add(abnorm))
+		k.r.Start(k.a.Sub(abnorm))
+	} else {
+		k.jr.Join(k.p, &k.r, k.u, k.a, k.anorm, abnorm)
+	}
+
+	// Approximate nearly-degenerate quadratics by linear segments.
+	abIsSmall := pDot(ab, ab) < epsilon
+	bcIsSmall := pDot(bc, bc) < epsilon
+	if abIsSmall || bcIsSmall {
+		acnorm := pRot90CCW(pNorm(c.Sub(k.a), k.u))
+		k.p.Add1(c.Add(acnorm))
+		k.r.Add1(c.Sub(acnorm))
+		k.a, k.anorm = c, acnorm
+		return
+	}
+
+	// The quadratic segment (k.a, b, c) has a point of maximum curvature.
+	// If this occurs at an end point, we process the segment as a whole.
+	t := curviest2(k.a, b, c)
+	if t <= 0 || 4096 <= t {
+		k.addNonCurvy2(b, c)
+		return
+	}
+
+	// Otherwise, we perform a de Casteljau decomposition at the point of
+	// maximum curvature and process the two straighter parts.
+	mab := interpolate(k.a, b, t)
+	mbc := interpolate(b, c, t)
+	mabc := interpolate(mab, mbc, t)
+
+	// If the vectors ab and bc are close to being in opposite directions,
+	// then the decomposition can become unstable, so we approximate the
+	// quadratic segment by two linear segments joined by an arc.
+	bcnorm := pRot90CCW(pNorm(bc, k.u))
+	if pDot(abnorm, bcnorm) < -fixed.Int52_12(k.u)*fixed.Int52_12(k.u)*2047/2048 {
+		pArc := pDot(abnorm, bc) < 0
+
+		k.p.Add1(mabc.Add(abnorm))
+		if pArc {
+			z := pRot90CW(abnorm)
+			addArc(k.p, mabc, abnorm, z)
+			addArc(k.p, mabc, z, bcnorm)
+		}
+		k.p.Add1(mabc.Add(bcnorm))
+		k.p.Add1(c.Add(bcnorm))
+
+		k.r.Add1(mabc.Sub(abnorm))
+		if !pArc {
+			z := pRot90CW(abnorm)
+			addArc(&k.r, mabc, pNeg(abnorm), z)
+			addArc(&k.r, mabc, z, pNeg(bcnorm))
+		}
+		k.r.Add1(mabc.Sub(bcnorm))
+		k.r.Add1(c.Sub(bcnorm))
+
+		k.a, k.anorm = c, bcnorm
+		return
+	}
+
+	// Process the decomposed parts.
+	k.addNonCurvy2(mab, mabc)
+	k.addNonCurvy2(mbc, c)
+}
+
+// Add3 adds a cubic segment to the stroker.
+func (k *stroker) Add3(b, c, d fixed.Point26_6) {
+	panic("freetype/raster: stroke unimplemented for cubic segments")
+}
+
+// stroke adds the stroked Path q to p, where q consists of exactly one curve.
+func (k *stroker) stroke(q Path) {
+	// Stroking is implemented by deriving two paths each k.u apart from q.
+	// The left-hand-side path is added immediately to k.p; the right-hand-side
+	// path is accumulated in k.r. Once we've finished adding the LHS to k.p,
+	// we add the RHS in reverse order.
+	k.r = make(Path, 0, len(q))
+	k.a = fixed.Point26_6{q[1], q[2]}
+	for i := 4; i < len(q); {
+		switch q[i] {
+		case 1:
+			k.Add1(
+				fixed.Point26_6{q[i+1], q[i+2]},
+			)
+			i += 4
+		case 2:
+			k.Add2(
+				fixed.Point26_6{q[i+1], q[i+2]},
+				fixed.Point26_6{q[i+3], q[i+4]},
+			)
+			i += 6
+		case 3:
+			k.Add3(
+				fixed.Point26_6{q[i+1], q[i+2]},
+				fixed.Point26_6{q[i+3], q[i+4]},
+				fixed.Point26_6{q[i+5], q[i+6]},
+			)
+			i += 8
+		default:
+			panic("freetype/raster: bad path")
+		}
+	}
+	if len(k.r) == 0 {
+		return
+	}
+	// TODO(nigeltao): if q is a closed curve then we should join the first and
+	// last segments instead of capping them.
+	k.cr.Cap(k.p, k.u, q.lastPoint(), pNeg(k.anorm))
+	addPathReversed(k.p, k.r)
+	pivot := q.firstPoint()
+	k.cr.Cap(k.p, k.u, pivot, pivot.Sub(fixed.Point26_6{k.r[1], k.r[2]}))
+}
+
+// Stroke adds q stroked with the given width to p. The result is typically
+// self-intersecting and should be rasterized with UseNonZeroWinding.
+// cr and jr may be nil, which defaults to a RoundCapper or RoundJoiner.
+func Stroke(p Adder, q Path, width fixed.Int26_6, cr Capper, jr Joiner) {
+	if len(q) == 0 {
+		return
+	}
+	if cr == nil {
+		cr = RoundCapper
+	}
+	if jr == nil {
+		jr = RoundJoiner
+	}
+	if q[0] != 0 {
+		panic("freetype/raster: bad path")
+	}
+	s := stroker{p: p, u: width / 2, cr: cr, jr: jr}
+	i := 0
+	for j := 4; j < len(q); {
+		switch q[j] {
+		case 0:
+			s.stroke(q[i:j])
+			i, j = j, j+4
+		case 1:
+			j += 4
+		case 2:
+			j += 6
+		case 3:
+			j += 8
+		default:
+			panic("freetype/raster: bad path")
+		}
+	}
+	s.stroke(q[i:])
+}
diff --git a/server/vendor/github.com/golang/freetype/truetype/face.go b/server/vendor/github.com/golang/freetype/truetype/face.go
new file mode 100644
index 000000000..099006f05
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/truetype/face.go
@@ -0,0 +1,507 @@
+// Copyright 2015 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+import (
+	"image"
+	"math"
+
+	"github.com/golang/freetype/raster"
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+func powerOf2(i int) bool {
+	return i != 0 && (i&(i-1)) == 0
+}
+
+// Options are optional arguments to NewFace.
+type Options struct {
+	// Size is the font size in points, as in "a 10 point font size".
+	//
+	// A zero value means to use a 12 point font size.
+	Size float64
+
+	// DPI is the dots-per-inch resolution.
+	//
+	// A zero value means to use 72 DPI.
+	DPI float64
+
+	// Hinting is how to quantize the glyph nodes.
+	//
+	// A zero value means to use no hinting.
+	Hinting font.Hinting
+
+	// GlyphCacheEntries is the number of entries in the glyph mask image
+	// cache.
+	//
+	// If non-zero, it must be a power of 2.
+	//
+	// A zero value means to use 512 entries.
+	GlyphCacheEntries int
+
+	// SubPixelsX is the number of sub-pixel locations a glyph's dot is
+	// quantized to, in the horizontal direction. For example, a value of 8
+	// means that the dot is quantized to 1/8th of a pixel. This quantization
+	// only affects the glyph mask image, not its bounding box or advance
+	// width. A higher value gives a more faithful glyph image, but reduces the
+	// effectiveness of the glyph cache.
+	//
+	// If non-zero, it must be a power of 2, and be between 1 and 64 inclusive.
+	//
+	// A zero value means to use 4 sub-pixel locations.
+	SubPixelsX int
+
+	// SubPixelsY is the number of sub-pixel locations a glyph's dot is
+	// quantized to, in the vertical direction. For example, a value of 8
+	// means that the dot is quantized to 1/8th of a pixel. This quantization
+	// only affects the glyph mask image, not its bounding box or advance
+	// width. A higher value gives a more faithful glyph image, but reduces the
+	// effectiveness of the glyph cache.
+	//
+	// If non-zero, it must be a power of 2, and be between 1 and 64 inclusive.
+	//
+	// A zero value means to use 1 sub-pixel location.
+	SubPixelsY int
+}
+
+func (o *Options) size() float64 {
+	if o != nil && o.Size > 0 {
+		return o.Size
+	}
+	return 12
+}
+
+func (o *Options) dpi() float64 {
+	if o != nil && o.DPI > 0 {
+		return o.DPI
+	}
+	return 72
+}
+
+func (o *Options) hinting() font.Hinting {
+	if o != nil {
+		switch o.Hinting {
+		case font.HintingVertical, font.HintingFull:
+			// TODO: support vertical hinting.
+			return font.HintingFull
+		}
+	}
+	return font.HintingNone
+}
+
+func (o *Options) glyphCacheEntries() int {
+	if o != nil && powerOf2(o.GlyphCacheEntries) {
+		return o.GlyphCacheEntries
+	}
+	// 512 is 128 * 4 * 1, which lets us cache 128 glyphs at 4 * 1 subpixel
+	// locations in the X and Y direction.
+	return 512
+}
+
+func (o *Options) subPixelsX() (value uint32, halfQuantum, mask fixed.Int26_6) {
+	if o != nil {
+		switch o.SubPixelsX {
+		case 1, 2, 4, 8, 16, 32, 64:
+			return subPixels(o.SubPixelsX)
+		}
+	}
+	// This default value of 4 isn't based on anything scientific, merely as
+	// small a number as possible that looks almost as good as no quantization,
+	// or returning subPixels(64).
+	return subPixels(4)
+}
+
+func (o *Options) subPixelsY() (value uint32, halfQuantum, mask fixed.Int26_6) {
+	if o != nil {
+		switch o.SubPixelsX {
+		case 1, 2, 4, 8, 16, 32, 64:
+			return subPixels(o.SubPixelsX)
+		}
+	}
+	// This default value of 1 isn't based on anything scientific, merely that
+	// vertical sub-pixel glyph rendering is pretty rare. Baseline locations
+	// can usually afford to snap to the pixel grid, so the vertical direction
+	// doesn't have the deal with the horizontal's fractional advance widths.
+	return subPixels(1)
+}
+
+// subPixels returns q and the bias and mask that leads to q quantized
+// sub-pixel locations per full pixel.
+//
+// For example, q == 4 leads to a bias of 8 and a mask of 0xfffffff0, or -16,
+// because we want to round fractions of fixed.Int26_6 as:
+//	-  0 to  7 rounds to 0.
+//	-  8 to 23 rounds to 16.
+//	- 24 to 39 rounds to 32.
+//	- 40 to 55 rounds to 48.
+//	- 56 to 63 rounds to 64.
+// which means to add 8 and then bitwise-and with -16, in two's complement
+// representation.
+//
+// When q ==  1, we want bias == 32 and mask == -64.
+// When q ==  2, we want bias == 16 and mask == -32.
+// When q ==  4, we want bias ==  8 and mask == -16.
+// ...
+// When q == 64, we want bias ==  0 and mask ==  -1. (The no-op case).
+// The pattern is clear.
+func subPixels(q int) (value uint32, bias, mask fixed.Int26_6) {
+	return uint32(q), 32 / fixed.Int26_6(q), -64 / fixed.Int26_6(q)
+}
+
+// glyphCacheEntry caches the arguments and return values of rasterize.
+type glyphCacheEntry struct {
+	key glyphCacheKey
+	val glyphCacheVal
+}
+
+type glyphCacheKey struct {
+	index  Index
+	fx, fy uint8
+}
+
+type glyphCacheVal struct {
+	advanceWidth fixed.Int26_6
+	offset       image.Point
+	gw           int
+	gh           int
+}
+
+type indexCacheEntry struct {
+	rune  rune
+	index Index
+}
+
+// NewFace returns a new font.Face for the given Font.
+func NewFace(f *Font, opts *Options) font.Face {
+	a := &face{
+		f:          f,
+		hinting:    opts.hinting(),
+		scale:      fixed.Int26_6(0.5 + (opts.size() * opts.dpi() * 64 / 72)),
+		glyphCache: make([]glyphCacheEntry, opts.glyphCacheEntries()),
+	}
+	a.subPixelX, a.subPixelBiasX, a.subPixelMaskX = opts.subPixelsX()
+	a.subPixelY, a.subPixelBiasY, a.subPixelMaskY = opts.subPixelsY()
+
+	// Fill the cache with invalid entries. Valid glyph cache entries have fx
+	// and fy in the range [0, 64). Valid index cache entries have rune >= 0.
+	for i := range a.glyphCache {
+		a.glyphCache[i].key.fy = 0xff
+	}
+	for i := range a.indexCache {
+		a.indexCache[i].rune = -1
+	}
+
+	// Set the rasterizer's bounds to be big enough to handle the largest glyph.
+	b := f.Bounds(a.scale)
+	xmin := +int(b.Min.X) >> 6
+	ymin := -int(b.Max.Y) >> 6
+	xmax := +int(b.Max.X+63) >> 6
+	ymax := -int(b.Min.Y-63) >> 6
+	a.maxw = xmax - xmin
+	a.maxh = ymax - ymin
+	a.masks = image.NewAlpha(image.Rect(0, 0, a.maxw, a.maxh*len(a.glyphCache)))
+	a.r.SetBounds(a.maxw, a.maxh)
+	a.p = facePainter{a}
+
+	return a
+}
+
+type face struct {
+	f             *Font
+	hinting       font.Hinting
+	scale         fixed.Int26_6
+	subPixelX     uint32
+	subPixelBiasX fixed.Int26_6
+	subPixelMaskX fixed.Int26_6
+	subPixelY     uint32
+	subPixelBiasY fixed.Int26_6
+	subPixelMaskY fixed.Int26_6
+	masks         *image.Alpha
+	glyphCache    []glyphCacheEntry
+	r             raster.Rasterizer
+	p             raster.Painter
+	paintOffset   int
+	maxw          int
+	maxh          int
+	glyphBuf      GlyphBuf
+	indexCache    [indexCacheLen]indexCacheEntry
+
+	// TODO: clip rectangle?
+}
+
+const indexCacheLen = 256
+
+func (a *face) index(r rune) Index {
+	const mask = indexCacheLen - 1
+	c := &a.indexCache[r&mask]
+	if c.rune == r {
+		return c.index
+	}
+	i := a.f.Index(r)
+	c.rune = r
+	c.index = i
+	return i
+}
+
+// Close satisfies the font.Face interface.
+func (a *face) Close() error { return nil }
+
+// Metrics satisfies the font.Face interface.
+func (a *face) Metrics() font.Metrics {
+	scale := float64(a.scale)
+	fupe := float64(a.f.FUnitsPerEm())
+	return font.Metrics{
+		Height:  a.scale,
+		Ascent:  fixed.Int26_6(math.Ceil(scale * float64(+a.f.ascent) / fupe)),
+		Descent: fixed.Int26_6(math.Ceil(scale * float64(-a.f.descent) / fupe)),
+	}
+}
+
+// Kern satisfies the font.Face interface.
+func (a *face) Kern(r0, r1 rune) fixed.Int26_6 {
+	i0 := a.index(r0)
+	i1 := a.index(r1)
+	kern := a.f.Kern(a.scale, i0, i1)
+	if a.hinting != font.HintingNone {
+		kern = (kern + 32) &^ 63
+	}
+	return kern
+}
+
+// Glyph satisfies the font.Face interface.
+func (a *face) Glyph(dot fixed.Point26_6, r rune) (
+	dr image.Rectangle, mask image.Image, maskp image.Point, advance fixed.Int26_6, ok bool) {
+
+	// Quantize to the sub-pixel granularity.
+	dotX := (dot.X + a.subPixelBiasX) & a.subPixelMaskX
+	dotY := (dot.Y + a.subPixelBiasY) & a.subPixelMaskY
+
+	// Split the coordinates into their integer and fractional parts.
+	ix, fx := int(dotX>>6), dotX&0x3f
+	iy, fy := int(dotY>>6), dotY&0x3f
+
+	index := a.index(r)
+	cIndex := uint32(index)
+	cIndex = cIndex*a.subPixelX - uint32(fx/a.subPixelMaskX)
+	cIndex = cIndex*a.subPixelY - uint32(fy/a.subPixelMaskY)
+	cIndex &= uint32(len(a.glyphCache) - 1)
+	a.paintOffset = a.maxh * int(cIndex)
+	k := glyphCacheKey{
+		index: index,
+		fx:    uint8(fx),
+		fy:    uint8(fy),
+	}
+	var v glyphCacheVal
+	if a.glyphCache[cIndex].key != k {
+		var ok bool
+		v, ok = a.rasterize(index, fx, fy)
+		if !ok {
+			return image.Rectangle{}, nil, image.Point{}, 0, false
+		}
+		a.glyphCache[cIndex] = glyphCacheEntry{k, v}
+	} else {
+		v = a.glyphCache[cIndex].val
+	}
+
+	dr.Min = image.Point{
+		X: ix + v.offset.X,
+		Y: iy + v.offset.Y,
+	}
+	dr.Max = image.Point{
+		X: dr.Min.X + v.gw,
+		Y: dr.Min.Y + v.gh,
+	}
+	return dr, a.masks, image.Point{Y: a.paintOffset}, v.advanceWidth, true
+}
+
+func (a *face) GlyphBounds(r rune) (bounds fixed.Rectangle26_6, advance fixed.Int26_6, ok bool) {
+	if err := a.glyphBuf.Load(a.f, a.scale, a.index(r), a.hinting); err != nil {
+		return fixed.Rectangle26_6{}, 0, false
+	}
+	xmin := +a.glyphBuf.Bounds.Min.X
+	ymin := -a.glyphBuf.Bounds.Max.Y
+	xmax := +a.glyphBuf.Bounds.Max.X
+	ymax := -a.glyphBuf.Bounds.Min.Y
+	if xmin > xmax || ymin > ymax {
+		return fixed.Rectangle26_6{}, 0, false
+	}
+	return fixed.Rectangle26_6{
+		Min: fixed.Point26_6{
+			X: xmin,
+			Y: ymin,
+		},
+		Max: fixed.Point26_6{
+			X: xmax,
+			Y: ymax,
+		},
+	}, a.glyphBuf.AdvanceWidth, true
+}
+
+func (a *face) GlyphAdvance(r rune) (advance fixed.Int26_6, ok bool) {
+	if err := a.glyphBuf.Load(a.f, a.scale, a.index(r), a.hinting); err != nil {
+		return 0, false
+	}
+	return a.glyphBuf.AdvanceWidth, true
+}
+
+// rasterize returns the advance width, integer-pixel offset to render at, and
+// the width and height of the given glyph at the given sub-pixel offsets.
+//
+// The 26.6 fixed point arguments fx and fy must be in the range [0, 1).
+func (a *face) rasterize(index Index, fx, fy fixed.Int26_6) (v glyphCacheVal, ok bool) {
+	if err := a.glyphBuf.Load(a.f, a.scale, index, a.hinting); err != nil {
+		return glyphCacheVal{}, false
+	}
+	// Calculate the integer-pixel bounds for the glyph.
+	xmin := int(fx+a.glyphBuf.Bounds.Min.X) >> 6
+	ymin := int(fy-a.glyphBuf.Bounds.Max.Y) >> 6
+	xmax := int(fx+a.glyphBuf.Bounds.Max.X+0x3f) >> 6
+	ymax := int(fy-a.glyphBuf.Bounds.Min.Y+0x3f) >> 6
+	if xmin > xmax || ymin > ymax {
+		return glyphCacheVal{}, false
+	}
+	// A TrueType's glyph's nodes can have negative co-ordinates, but the
+	// rasterizer clips anything left of x=0 or above y=0. xmin and ymin are
+	// the pixel offsets, based on the font's FUnit metrics, that let a
+	// negative co-ordinate in TrueType space be non-negative in rasterizer
+	// space. xmin and ymin are typically <= 0.
+	fx -= fixed.Int26_6(xmin << 6)
+	fy -= fixed.Int26_6(ymin << 6)
+	// Rasterize the glyph's vectors.
+	a.r.Clear()
+	pixOffset := a.paintOffset * a.maxw
+	clear(a.masks.Pix[pixOffset : pixOffset+a.maxw*a.maxh])
+	e0 := 0
+	for _, e1 := range a.glyphBuf.Ends {
+		a.drawContour(a.glyphBuf.Points[e0:e1], fx, fy)
+		e0 = e1
+	}
+	a.r.Rasterize(a.p)
+	return glyphCacheVal{
+		a.glyphBuf.AdvanceWidth,
+		image.Point{xmin, ymin},
+		xmax - xmin,
+		ymax - ymin,
+	}, true
+}
+
+func clear(pix []byte) {
+	for i := range pix {
+		pix[i] = 0
+	}
+}
+
+// drawContour draws the given closed contour with the given offset.
+func (a *face) drawContour(ps []Point, dx, dy fixed.Int26_6) {
+	if len(ps) == 0 {
+		return
+	}
+
+	// The low bit of each point's Flags value is whether the point is on the
+	// curve. Truetype fonts only have quadratic Bézier curves, not cubics.
+	// Thus, two consecutive off-curve points imply an on-curve point in the
+	// middle of those two.
+	//
+	// See http://chanae.walon.org/pub/ttf/ttf_glyphs.htm for more details.
+
+	// ps[0] is a truetype.Point measured in FUnits and positive Y going
+	// upwards. start is the same thing measured in fixed point units and
+	// positive Y going downwards, and offset by (dx, dy).
+	start := fixed.Point26_6{
+		X: dx + ps[0].X,
+		Y: dy - ps[0].Y,
+	}
+	var others []Point
+	if ps[0].Flags&0x01 != 0 {
+		others = ps[1:]
+	} else {
+		last := fixed.Point26_6{
+			X: dx + ps[len(ps)-1].X,
+			Y: dy - ps[len(ps)-1].Y,
+		}
+		if ps[len(ps)-1].Flags&0x01 != 0 {
+			start = last
+			others = ps[:len(ps)-1]
+		} else {
+			start = fixed.Point26_6{
+				X: (start.X + last.X) / 2,
+				Y: (start.Y + last.Y) / 2,
+			}
+			others = ps
+		}
+	}
+	a.r.Start(start)
+	q0, on0 := start, true
+	for _, p := range others {
+		q := fixed.Point26_6{
+			X: dx + p.X,
+			Y: dy - p.Y,
+		}
+		on := p.Flags&0x01 != 0
+		if on {
+			if on0 {
+				a.r.Add1(q)
+			} else {
+				a.r.Add2(q0, q)
+			}
+		} else {
+			if on0 {
+				// No-op.
+			} else {
+				mid := fixed.Point26_6{
+					X: (q0.X + q.X) / 2,
+					Y: (q0.Y + q.Y) / 2,
+				}
+				a.r.Add2(q0, mid)
+			}
+		}
+		q0, on0 = q, on
+	}
+	// Close the curve.
+	if on0 {
+		a.r.Add1(start)
+	} else {
+		a.r.Add2(q0, start)
+	}
+}
+
+// facePainter is like a raster.AlphaSrcPainter, with an additional Y offset
+// (face.paintOffset) to the painted spans.
+type facePainter struct {
+	a *face
+}
+
+func (p facePainter) Paint(ss []raster.Span, done bool) {
+	m := p.a.masks
+	b := m.Bounds()
+	b.Min.Y = p.a.paintOffset
+	b.Max.Y = p.a.paintOffset + p.a.maxh
+	for _, s := range ss {
+		s.Y += p.a.paintOffset
+		if s.Y < b.Min.Y {
+			continue
+		}
+		if s.Y >= b.Max.Y {
+			return
+		}
+		if s.X0 < b.Min.X {
+			s.X0 = b.Min.X
+		}
+		if s.X1 > b.Max.X {
+			s.X1 = b.Max.X
+		}
+		if s.X0 >= s.X1 {
+			continue
+		}
+		base := (s.Y-m.Rect.Min.Y)*m.Stride - m.Rect.Min.X
+		p := m.Pix[base+s.X0 : base+s.X1]
+		color := uint8(s.Alpha >> 8)
+		for i := range p {
+			p[i] = color
+		}
+	}
+}
diff --git a/server/vendor/github.com/golang/freetype/truetype/glyph.go b/server/vendor/github.com/golang/freetype/truetype/glyph.go
new file mode 100644
index 000000000..6157ad83e
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/truetype/glyph.go
@@ -0,0 +1,522 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+import (
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+// TODO: implement VerticalHinting.
+
+// A Point is a co-ordinate pair plus whether it is 'on' a contour or an 'off'
+// control point.
+type Point struct {
+	X, Y fixed.Int26_6
+	// The Flags' LSB means whether or not this Point is 'on' the contour.
+	// Other bits are reserved for internal use.
+	Flags uint32
+}
+
+// A GlyphBuf holds a glyph's contours. A GlyphBuf can be re-used to load a
+// series of glyphs from a Font.
+type GlyphBuf struct {
+	// AdvanceWidth is the glyph's advance width.
+	AdvanceWidth fixed.Int26_6
+	// Bounds is the glyph's bounding box.
+	Bounds fixed.Rectangle26_6
+	// Points contains all Points from all contours of the glyph. If hinting
+	// was used to load a glyph then Unhinted contains those Points before they
+	// were hinted, and InFontUnits contains those Points before they were
+	// hinted and scaled.
+	Points, Unhinted, InFontUnits []Point
+	// Ends is the point indexes of the end point of each contour. The length
+	// of Ends is the number of contours in the glyph. The i'th contour
+	// consists of points Points[Ends[i-1]:Ends[i]], where Ends[-1] is
+	// interpreted to mean zero.
+	Ends []int
+
+	font    *Font
+	scale   fixed.Int26_6
+	hinting font.Hinting
+	hinter  hinter
+	// phantomPoints are the co-ordinates of the synthetic phantom points
+	// used for hinting and bounding box calculations.
+	phantomPoints [4]Point
+	// pp1x is the X co-ordinate of the first phantom point. The '1' is
+	// using 1-based indexing; pp1x is almost always phantomPoints[0].X.
+	// TODO: eliminate this and consistently use phantomPoints[0].X.
+	pp1x fixed.Int26_6
+	// metricsSet is whether the glyph's metrics have been set yet. For a
+	// compound glyph, a sub-glyph may override the outer glyph's metrics.
+	metricsSet bool
+	// tmp is a scratch buffer.
+	tmp []Point
+}
+
+// Flags for decoding a glyph's contours. These flags are documented at
+// http://developer.apple.com/fonts/TTRefMan/RM06/Chap6glyf.html.
+const (
+	flagOnCurve = 1 << iota
+	flagXShortVector
+	flagYShortVector
+	flagRepeat
+	flagPositiveXShortVector
+	flagPositiveYShortVector
+
+	// The remaining flags are for internal use.
+	flagTouchedX
+	flagTouchedY
+)
+
+// The same flag bits (0x10 and 0x20) are overloaded to have two meanings,
+// dependent on the value of the flag{X,Y}ShortVector bits.
+const (
+	flagThisXIsSame = flagPositiveXShortVector
+	flagThisYIsSame = flagPositiveYShortVector
+)
+
+// Load loads a glyph's contours from a Font, overwriting any previously loaded
+// contours for this GlyphBuf. scale is the number of 26.6 fixed point units in
+// 1 em, i is the glyph index, and h is the hinting policy.
+func (g *GlyphBuf) Load(f *Font, scale fixed.Int26_6, i Index, h font.Hinting) error {
+	g.Points = g.Points[:0]
+	g.Unhinted = g.Unhinted[:0]
+	g.InFontUnits = g.InFontUnits[:0]
+	g.Ends = g.Ends[:0]
+	g.font = f
+	g.hinting = h
+	g.scale = scale
+	g.pp1x = 0
+	g.phantomPoints = [4]Point{}
+	g.metricsSet = false
+
+	if h != font.HintingNone {
+		if err := g.hinter.init(f, scale); err != nil {
+			return err
+		}
+	}
+	if err := g.load(0, i, true); err != nil {
+		return err
+	}
+	// TODO: this selection of either g.pp1x or g.phantomPoints[0].X isn't ideal,
+	// and should be cleaned up once we have all the testScaling tests passing,
+	// plus additional tests for Freetype-Go's bounding boxes matching C Freetype's.
+	pp1x := g.pp1x
+	if h != font.HintingNone {
+		pp1x = g.phantomPoints[0].X
+	}
+	if pp1x != 0 {
+		for i := range g.Points {
+			g.Points[i].X -= pp1x
+		}
+	}
+
+	advanceWidth := g.phantomPoints[1].X - g.phantomPoints[0].X
+	if h != font.HintingNone {
+		if len(f.hdmx) >= 8 {
+			if n := u32(f.hdmx, 4); n > 3+uint32(i) {
+				for hdmx := f.hdmx[8:]; uint32(len(hdmx)) >= n; hdmx = hdmx[n:] {
+					if fixed.Int26_6(hdmx[0]) == scale>>6 {
+						advanceWidth = fixed.Int26_6(hdmx[2+i]) << 6
+						break
+					}
+				}
+			}
+		}
+		advanceWidth = (advanceWidth + 32) &^ 63
+	}
+	g.AdvanceWidth = advanceWidth
+
+	// Set g.Bounds to the 'control box', which is the bounding box of the
+	// Bézier curves' control points. This is easier to calculate, no smaller
+	// than and often equal to the tightest possible bounding box of the curves
+	// themselves. This approach is what C Freetype does. We can't just scale
+	// the nominal bounding box in the glyf data as the hinting process and
+	// phantom point adjustment may move points outside of that box.
+	if len(g.Points) == 0 {
+		g.Bounds = fixed.Rectangle26_6{}
+	} else {
+		p := g.Points[0]
+		g.Bounds.Min.X = p.X
+		g.Bounds.Max.X = p.X
+		g.Bounds.Min.Y = p.Y
+		g.Bounds.Max.Y = p.Y
+		for _, p := range g.Points[1:] {
+			if g.Bounds.Min.X > p.X {
+				g.Bounds.Min.X = p.X
+			} else if g.Bounds.Max.X < p.X {
+				g.Bounds.Max.X = p.X
+			}
+			if g.Bounds.Min.Y > p.Y {
+				g.Bounds.Min.Y = p.Y
+			} else if g.Bounds.Max.Y < p.Y {
+				g.Bounds.Max.Y = p.Y
+			}
+		}
+		// Snap the box to the grid, if hinting is on.
+		if h != font.HintingNone {
+			g.Bounds.Min.X &^= 63
+			g.Bounds.Min.Y &^= 63
+			g.Bounds.Max.X += 63
+			g.Bounds.Max.X &^= 63
+			g.Bounds.Max.Y += 63
+			g.Bounds.Max.Y &^= 63
+		}
+	}
+	return nil
+}
+
+func (g *GlyphBuf) load(recursion uint32, i Index, useMyMetrics bool) (err error) {
+	// The recursion limit here is arbitrary, but defends against malformed glyphs.
+	if recursion >= 32 {
+		return UnsupportedError("excessive compound glyph recursion")
+	}
+	// Find the relevant slice of g.font.glyf.
+	var g0, g1 uint32
+	if g.font.locaOffsetFormat == locaOffsetFormatShort {
+		g0 = 2 * uint32(u16(g.font.loca, 2*int(i)))
+		g1 = 2 * uint32(u16(g.font.loca, 2*int(i)+2))
+	} else {
+		g0 = u32(g.font.loca, 4*int(i))
+		g1 = u32(g.font.loca, 4*int(i)+4)
+	}
+
+	// Decode the contour count and nominal bounding box, from the first
+	// 10 bytes of the glyf data. boundsYMin and boundsXMax, at offsets 4
+	// and 6, are unused.
+	glyf, ne, boundsXMin, boundsYMax := []byte(nil), 0, fixed.Int26_6(0), fixed.Int26_6(0)
+	if g0+10 <= g1 {
+		glyf = g.font.glyf[g0:g1]
+		ne = int(int16(u16(glyf, 0)))
+		boundsXMin = fixed.Int26_6(int16(u16(glyf, 2)))
+		boundsYMax = fixed.Int26_6(int16(u16(glyf, 8)))
+	}
+
+	// Create the phantom points.
+	uhm, pp1x := g.font.unscaledHMetric(i), fixed.Int26_6(0)
+	uvm := g.font.unscaledVMetric(i, boundsYMax)
+	g.phantomPoints = [4]Point{
+		{X: boundsXMin - uhm.LeftSideBearing},
+		{X: boundsXMin - uhm.LeftSideBearing + uhm.AdvanceWidth},
+		{X: uhm.AdvanceWidth / 2, Y: boundsYMax + uvm.TopSideBearing},
+		{X: uhm.AdvanceWidth / 2, Y: boundsYMax + uvm.TopSideBearing - uvm.AdvanceHeight},
+	}
+	if len(glyf) == 0 {
+		g.addPhantomsAndScale(len(g.Points), len(g.Points), true, true)
+		copy(g.phantomPoints[:], g.Points[len(g.Points)-4:])
+		g.Points = g.Points[:len(g.Points)-4]
+		// TODO: also trim g.InFontUnits and g.Unhinted?
+		return nil
+	}
+
+	// Load and hint the contours.
+	if ne < 0 {
+		if ne != -1 {
+			// http://developer.apple.com/fonts/TTRefMan/RM06/Chap6glyf.html says that
+			// "the values -2, -3, and so forth, are reserved for future use."
+			return UnsupportedError("negative number of contours")
+		}
+		pp1x = g.font.scale(g.scale * (boundsXMin - uhm.LeftSideBearing))
+		if err := g.loadCompound(recursion, uhm, i, glyf, useMyMetrics); err != nil {
+			return err
+		}
+	} else {
+		np0, ne0 := len(g.Points), len(g.Ends)
+		program := g.loadSimple(glyf, ne)
+		g.addPhantomsAndScale(np0, np0, true, true)
+		pp1x = g.Points[len(g.Points)-4].X
+		if g.hinting != font.HintingNone {
+			if len(program) != 0 {
+				err := g.hinter.run(
+					program,
+					g.Points[np0:],
+					g.Unhinted[np0:],
+					g.InFontUnits[np0:],
+					g.Ends[ne0:],
+				)
+				if err != nil {
+					return err
+				}
+			}
+			// Drop the four phantom points.
+			g.InFontUnits = g.InFontUnits[:len(g.InFontUnits)-4]
+			g.Unhinted = g.Unhinted[:len(g.Unhinted)-4]
+		}
+		if useMyMetrics {
+			copy(g.phantomPoints[:], g.Points[len(g.Points)-4:])
+		}
+		g.Points = g.Points[:len(g.Points)-4]
+		if np0 != 0 {
+			// The hinting program expects the []Ends values to be indexed
+			// relative to the inner glyph, not the outer glyph, so we delay
+			// adding np0 until after the hinting program (if any) has run.
+			for i := ne0; i < len(g.Ends); i++ {
+				g.Ends[i] += np0
+			}
+		}
+	}
+	if useMyMetrics && !g.metricsSet {
+		g.metricsSet = true
+		g.pp1x = pp1x
+	}
+	return nil
+}
+
+// loadOffset is the initial offset for loadSimple and loadCompound. The first
+// 10 bytes are the number of contours and the bounding box.
+const loadOffset = 10
+
+func (g *GlyphBuf) loadSimple(glyf []byte, ne int) (program []byte) {
+	offset := loadOffset
+	for i := 0; i < ne; i++ {
+		g.Ends = append(g.Ends, 1+int(u16(glyf, offset)))
+		offset += 2
+	}
+
+	// Note the TrueType hinting instructions.
+	instrLen := int(u16(glyf, offset))
+	offset += 2
+	program = glyf[offset : offset+instrLen]
+	offset += instrLen
+
+	if ne == 0 {
+		return program
+	}
+
+	np0 := len(g.Points)
+	np1 := np0 + int(g.Ends[len(g.Ends)-1])
+
+	// Decode the flags.
+	for i := np0; i < np1; {
+		c := uint32(glyf[offset])
+		offset++
+		g.Points = append(g.Points, Point{Flags: c})
+		i++
+		if c&flagRepeat != 0 {
+			count := glyf[offset]
+			offset++
+			for ; count > 0; count-- {
+				g.Points = append(g.Points, Point{Flags: c})
+				i++
+			}
+		}
+	}
+
+	// Decode the co-ordinates.
+	var x int16
+	for i := np0; i < np1; i++ {
+		f := g.Points[i].Flags
+		if f&flagXShortVector != 0 {
+			dx := int16(glyf[offset])
+			offset++
+			if f&flagPositiveXShortVector == 0 {
+				x -= dx
+			} else {
+				x += dx
+			}
+		} else if f&flagThisXIsSame == 0 {
+			x += int16(u16(glyf, offset))
+			offset += 2
+		}
+		g.Points[i].X = fixed.Int26_6(x)
+	}
+	var y int16
+	for i := np0; i < np1; i++ {
+		f := g.Points[i].Flags
+		if f&flagYShortVector != 0 {
+			dy := int16(glyf[offset])
+			offset++
+			if f&flagPositiveYShortVector == 0 {
+				y -= dy
+			} else {
+				y += dy
+			}
+		} else if f&flagThisYIsSame == 0 {
+			y += int16(u16(glyf, offset))
+			offset += 2
+		}
+		g.Points[i].Y = fixed.Int26_6(y)
+	}
+
+	return program
+}
+
+func (g *GlyphBuf) loadCompound(recursion uint32, uhm HMetric, i Index,
+	glyf []byte, useMyMetrics bool) error {
+
+	// Flags for decoding a compound glyph. These flags are documented at
+	// http://developer.apple.com/fonts/TTRefMan/RM06/Chap6glyf.html.
+	const (
+		flagArg1And2AreWords = 1 << iota
+		flagArgsAreXYValues
+		flagRoundXYToGrid
+		flagWeHaveAScale
+		flagUnused
+		flagMoreComponents
+		flagWeHaveAnXAndYScale
+		flagWeHaveATwoByTwo
+		flagWeHaveInstructions
+		flagUseMyMetrics
+		flagOverlapCompound
+	)
+	np0, ne0 := len(g.Points), len(g.Ends)
+	offset := loadOffset
+	for {
+		flags := u16(glyf, offset)
+		component := Index(u16(glyf, offset+2))
+		dx, dy, transform, hasTransform := fixed.Int26_6(0), fixed.Int26_6(0), [4]int16{}, false
+		if flags&flagArg1And2AreWords != 0 {
+			dx = fixed.Int26_6(int16(u16(glyf, offset+4)))
+			dy = fixed.Int26_6(int16(u16(glyf, offset+6)))
+			offset += 8
+		} else {
+			dx = fixed.Int26_6(int16(int8(glyf[offset+4])))
+			dy = fixed.Int26_6(int16(int8(glyf[offset+5])))
+			offset += 6
+		}
+		if flags&flagArgsAreXYValues == 0 {
+			return UnsupportedError("compound glyph transform vector")
+		}
+		if flags&(flagWeHaveAScale|flagWeHaveAnXAndYScale|flagWeHaveATwoByTwo) != 0 {
+			hasTransform = true
+			switch {
+			case flags&flagWeHaveAScale != 0:
+				transform[0] = int16(u16(glyf, offset+0))
+				transform[3] = transform[0]
+				offset += 2
+			case flags&flagWeHaveAnXAndYScale != 0:
+				transform[0] = int16(u16(glyf, offset+0))
+				transform[3] = int16(u16(glyf, offset+2))
+				offset += 4
+			case flags&flagWeHaveATwoByTwo != 0:
+				transform[0] = int16(u16(glyf, offset+0))
+				transform[1] = int16(u16(glyf, offset+2))
+				transform[2] = int16(u16(glyf, offset+4))
+				transform[3] = int16(u16(glyf, offset+6))
+				offset += 8
+			}
+		}
+		savedPP := g.phantomPoints
+		np0 := len(g.Points)
+		componentUMM := useMyMetrics && (flags&flagUseMyMetrics != 0)
+		if err := g.load(recursion+1, component, componentUMM); err != nil {
+			return err
+		}
+		if flags&flagUseMyMetrics == 0 {
+			g.phantomPoints = savedPP
+		}
+		if hasTransform {
+			for j := np0; j < len(g.Points); j++ {
+				p := &g.Points[j]
+				newX := 0 +
+					fixed.Int26_6((int64(p.X)*int64(transform[0])+1<<13)>>14) +
+					fixed.Int26_6((int64(p.Y)*int64(transform[2])+1<<13)>>14)
+				newY := 0 +
+					fixed.Int26_6((int64(p.X)*int64(transform[1])+1<<13)>>14) +
+					fixed.Int26_6((int64(p.Y)*int64(transform[3])+1<<13)>>14)
+				p.X, p.Y = newX, newY
+			}
+		}
+		dx = g.font.scale(g.scale * dx)
+		dy = g.font.scale(g.scale * dy)
+		if flags&flagRoundXYToGrid != 0 {
+			dx = (dx + 32) &^ 63
+			dy = (dy + 32) &^ 63
+		}
+		for j := np0; j < len(g.Points); j++ {
+			p := &g.Points[j]
+			p.X += dx
+			p.Y += dy
+		}
+		// TODO: also adjust g.InFontUnits and g.Unhinted?
+		if flags&flagMoreComponents == 0 {
+			break
+		}
+	}
+
+	instrLen := 0
+	if g.hinting != font.HintingNone && offset+2 <= len(glyf) {
+		instrLen = int(u16(glyf, offset))
+		offset += 2
+	}
+
+	g.addPhantomsAndScale(np0, len(g.Points), false, instrLen > 0)
+	points, ends := g.Points[np0:], g.Ends[ne0:]
+	g.Points = g.Points[:len(g.Points)-4]
+	for j := range points {
+		points[j].Flags &^= flagTouchedX | flagTouchedY
+	}
+
+	if instrLen == 0 {
+		if !g.metricsSet {
+			copy(g.phantomPoints[:], points[len(points)-4:])
+		}
+		return nil
+	}
+
+	// Hint the compound glyph.
+	program := glyf[offset : offset+instrLen]
+	// Temporarily adjust the ends to be relative to this compound glyph.
+	if np0 != 0 {
+		for i := range ends {
+			ends[i] -= np0
+		}
+	}
+	// Hinting instructions of a composite glyph completely refer to the
+	// (already) hinted subglyphs.
+	g.tmp = append(g.tmp[:0], points...)
+	if err := g.hinter.run(program, points, g.tmp, g.tmp, ends); err != nil {
+		return err
+	}
+	if np0 != 0 {
+		for i := range ends {
+			ends[i] += np0
+		}
+	}
+	if !g.metricsSet {
+		copy(g.phantomPoints[:], points[len(points)-4:])
+	}
+	return nil
+}
+
+func (g *GlyphBuf) addPhantomsAndScale(np0, np1 int, simple, adjust bool) {
+	// Add the four phantom points.
+	g.Points = append(g.Points, g.phantomPoints[:]...)
+	// Scale the points.
+	if simple && g.hinting != font.HintingNone {
+		g.InFontUnits = append(g.InFontUnits, g.Points[np1:]...)
+	}
+	for i := np1; i < len(g.Points); i++ {
+		p := &g.Points[i]
+		p.X = g.font.scale(g.scale * p.X)
+		p.Y = g.font.scale(g.scale * p.Y)
+	}
+	if g.hinting == font.HintingNone {
+		return
+	}
+	// Round the 1st phantom point to the grid, shifting all other points equally.
+	// Note that "all other points" starts from np0, not np1.
+	// TODO: delete this adjustment and the np0/np1 distinction, when
+	// we update the compatibility tests to C Freetype 2.5.3.
+	// See http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=05c786d990390a7ca18e62962641dac740bacb06
+	if adjust {
+		pp1x := g.Points[len(g.Points)-4].X
+		if dx := ((pp1x + 32) &^ 63) - pp1x; dx != 0 {
+			for i := np0; i < len(g.Points); i++ {
+				g.Points[i].X += dx
+			}
+		}
+	}
+	if simple {
+		g.Unhinted = append(g.Unhinted, g.Points[np1:]...)
+	}
+	// Round the 2nd and 4th phantom point to the grid.
+	p := &g.Points[len(g.Points)-3]
+	p.X = (p.X + 32) &^ 63
+	p = &g.Points[len(g.Points)-1]
+	p.Y = (p.Y + 32) &^ 63
+}
diff --git a/server/vendor/github.com/golang/freetype/truetype/hint.go b/server/vendor/github.com/golang/freetype/truetype/hint.go
new file mode 100644
index 000000000..13f785bc3
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/truetype/hint.go
@@ -0,0 +1,1770 @@
+// Copyright 2012 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+// This file implements a Truetype bytecode interpreter.
+// The opcodes are described at https://developer.apple.com/fonts/TTRefMan/RM05/Chap5.html
+
+import (
+	"errors"
+	"math"
+
+	"golang.org/x/image/math/fixed"
+)
+
+const (
+	twilightZone = 0
+	glyphZone    = 1
+	numZone      = 2
+)
+
+type pointType uint32
+
+const (
+	current      pointType = 0
+	unhinted     pointType = 1
+	inFontUnits  pointType = 2
+	numPointType           = 3
+)
+
+// callStackEntry is a bytecode call stack entry.
+type callStackEntry struct {
+	program   []byte
+	pc        int
+	loopCount int32
+}
+
+// hinter implements bytecode hinting. A hinter can be re-used to hint a series
+// of glyphs from a Font.
+type hinter struct {
+	stack, store []int32
+
+	// functions is a map from function number to bytecode.
+	functions map[int32][]byte
+
+	// font and scale are the font and scale last used for this hinter.
+	// Changing the font will require running the new font's fpgm bytecode.
+	// Changing either will require running the font's prep bytecode.
+	font  *Font
+	scale fixed.Int26_6
+
+	// gs and defaultGS are the current and default graphics state. The
+	// default graphics state is the global default graphics state after
+	// the font's fpgm and prep programs have been run.
+	gs, defaultGS graphicsState
+
+	// points and ends are the twilight zone's points, glyph's points
+	// and glyph's contour boundaries.
+	points [numZone][numPointType][]Point
+	ends   []int
+
+	// scaledCVT is the lazily initialized scaled Control Value Table.
+	scaledCVTInitialized bool
+	scaledCVT            []fixed.Int26_6
+}
+
+// graphicsState is described at https://developer.apple.com/fonts/TTRefMan/RM04/Chap4.html
+type graphicsState struct {
+	// Projection vector, freedom vector and dual projection vector.
+	pv, fv, dv [2]f2dot14
+	// Reference points and zone pointers.
+	rp, zp [3]int32
+	// Control Value / Single Width Cut-In.
+	controlValueCutIn, singleWidthCutIn, singleWidth fixed.Int26_6
+	// Delta base / shift.
+	deltaBase, deltaShift int32
+	// Minimum distance.
+	minDist fixed.Int26_6
+	// Loop count.
+	loop int32
+	// Rounding policy.
+	roundPeriod, roundPhase, roundThreshold fixed.Int26_6
+	roundSuper45                            bool
+	// Auto-flip.
+	autoFlip bool
+}
+
+var globalDefaultGS = graphicsState{
+	pv:                [2]f2dot14{0x4000, 0}, // Unit vector along the X axis.
+	fv:                [2]f2dot14{0x4000, 0},
+	dv:                [2]f2dot14{0x4000, 0},
+	zp:                [3]int32{1, 1, 1},
+	controlValueCutIn: (17 << 6) / 16, // 17/16 as a fixed.Int26_6.
+	deltaBase:         9,
+	deltaShift:        3,
+	minDist:           1 << 6, // 1 as a fixed.Int26_6.
+	loop:              1,
+	roundPeriod:       1 << 6, // 1 as a fixed.Int26_6.
+	roundThreshold:    1 << 5, // 1/2 as a fixed.Int26_6.
+	roundSuper45:      false,
+	autoFlip:          true,
+}
+
+func resetTwilightPoints(f *Font, p []Point) []Point {
+	if n := int(f.maxTwilightPoints) + 4; n <= cap(p) {
+		p = p[:n]
+		for i := range p {
+			p[i] = Point{}
+		}
+	} else {
+		p = make([]Point, n)
+	}
+	return p
+}
+
+func (h *hinter) init(f *Font, scale fixed.Int26_6) error {
+	h.points[twilightZone][0] = resetTwilightPoints(f, h.points[twilightZone][0])
+	h.points[twilightZone][1] = resetTwilightPoints(f, h.points[twilightZone][1])
+	h.points[twilightZone][2] = resetTwilightPoints(f, h.points[twilightZone][2])
+
+	rescale := h.scale != scale
+	if h.font != f {
+		h.font, rescale = f, true
+		if h.functions == nil {
+			h.functions = make(map[int32][]byte)
+		} else {
+			for k := range h.functions {
+				delete(h.functions, k)
+			}
+		}
+
+		if x := int(f.maxStackElements); x > len(h.stack) {
+			x += 255
+			x &^= 255
+			h.stack = make([]int32, x)
+		}
+		if x := int(f.maxStorage); x > len(h.store) {
+			x += 15
+			x &^= 15
+			h.store = make([]int32, x)
+		}
+		if len(f.fpgm) != 0 {
+			if err := h.run(f.fpgm, nil, nil, nil, nil); err != nil {
+				return err
+			}
+		}
+	}
+
+	if rescale {
+		h.scale = scale
+		h.scaledCVTInitialized = false
+
+		h.defaultGS = globalDefaultGS
+
+		if len(f.prep) != 0 {
+			if err := h.run(f.prep, nil, nil, nil, nil); err != nil {
+				return err
+			}
+			h.defaultGS = h.gs
+			// The MS rasterizer doesn't allow the following graphics state
+			// variables to be modified by the CVT program.
+			h.defaultGS.pv = globalDefaultGS.pv
+			h.defaultGS.fv = globalDefaultGS.fv
+			h.defaultGS.dv = globalDefaultGS.dv
+			h.defaultGS.rp = globalDefaultGS.rp
+			h.defaultGS.zp = globalDefaultGS.zp
+			h.defaultGS.loop = globalDefaultGS.loop
+		}
+	}
+	return nil
+}
+
+func (h *hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point, ends []int) error {
+	h.gs = h.defaultGS
+	h.points[glyphZone][current] = pCurrent
+	h.points[glyphZone][unhinted] = pUnhinted
+	h.points[glyphZone][inFontUnits] = pInFontUnits
+	h.ends = ends
+
+	if len(program) > 50000 {
+		return errors.New("truetype: hinting: too many instructions")
+	}
+	var (
+		steps, pc, top int
+		opcode         uint8
+
+		callStack    [32]callStackEntry
+		callStackTop int
+	)
+
+	for 0 <= pc && pc < len(program) {
+		steps++
+		if steps == 100000 {
+			return errors.New("truetype: hinting: too many steps")
+		}
+		opcode = program[pc]
+		if top < int(popCount[opcode]) {
+			return errors.New("truetype: hinting: stack underflow")
+		}
+		switch opcode {
+
+		case opSVTCA0:
+			h.gs.pv = [2]f2dot14{0, 0x4000}
+			h.gs.fv = [2]f2dot14{0, 0x4000}
+			h.gs.dv = [2]f2dot14{0, 0x4000}
+
+		case opSVTCA1:
+			h.gs.pv = [2]f2dot14{0x4000, 0}
+			h.gs.fv = [2]f2dot14{0x4000, 0}
+			h.gs.dv = [2]f2dot14{0x4000, 0}
+
+		case opSPVTCA0:
+			h.gs.pv = [2]f2dot14{0, 0x4000}
+			h.gs.dv = [2]f2dot14{0, 0x4000}
+
+		case opSPVTCA1:
+			h.gs.pv = [2]f2dot14{0x4000, 0}
+			h.gs.dv = [2]f2dot14{0x4000, 0}
+
+		case opSFVTCA0:
+			h.gs.fv = [2]f2dot14{0, 0x4000}
+
+		case opSFVTCA1:
+			h.gs.fv = [2]f2dot14{0x4000, 0}
+
+		case opSPVTL0, opSPVTL1, opSFVTL0, opSFVTL1:
+			top -= 2
+			p1 := h.point(0, current, h.stack[top+0])
+			p2 := h.point(0, current, h.stack[top+1])
+			if p1 == nil || p2 == nil {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			dx := f2dot14(p1.X - p2.X)
+			dy := f2dot14(p1.Y - p2.Y)
+			if dx == 0 && dy == 0 {
+				dx = 0x4000
+			} else if opcode&1 != 0 {
+				// Counter-clockwise rotation.
+				dx, dy = -dy, dx
+			}
+			v := normalize(dx, dy)
+			if opcode < opSFVTL0 {
+				h.gs.pv = v
+				h.gs.dv = v
+			} else {
+				h.gs.fv = v
+			}
+
+		case opSPVFS:
+			top -= 2
+			h.gs.pv = normalize(f2dot14(h.stack[top]), f2dot14(h.stack[top+1]))
+			h.gs.dv = h.gs.pv
+
+		case opSFVFS:
+			top -= 2
+			h.gs.fv = normalize(f2dot14(h.stack[top]), f2dot14(h.stack[top+1]))
+
+		case opGPV:
+			if top+1 >= len(h.stack) {
+				return errors.New("truetype: hinting: stack overflow")
+			}
+			h.stack[top+0] = int32(h.gs.pv[0])
+			h.stack[top+1] = int32(h.gs.pv[1])
+			top += 2
+
+		case opGFV:
+			if top+1 >= len(h.stack) {
+				return errors.New("truetype: hinting: stack overflow")
+			}
+			h.stack[top+0] = int32(h.gs.fv[0])
+			h.stack[top+1] = int32(h.gs.fv[1])
+			top += 2
+
+		case opSFVTPV:
+			h.gs.fv = h.gs.pv
+
+		case opISECT:
+			top -= 5
+			p := h.point(2, current, h.stack[top+0])
+			a0 := h.point(1, current, h.stack[top+1])
+			a1 := h.point(1, current, h.stack[top+2])
+			b0 := h.point(0, current, h.stack[top+3])
+			b1 := h.point(0, current, h.stack[top+4])
+			if p == nil || a0 == nil || a1 == nil || b0 == nil || b1 == nil {
+				return errors.New("truetype: hinting: point out of range")
+			}
+
+			dbx := b1.X - b0.X
+			dby := b1.Y - b0.Y
+			dax := a1.X - a0.X
+			day := a1.Y - a0.Y
+			dx := b0.X - a0.X
+			dy := b0.Y - a0.Y
+			discriminant := mulDiv(int64(dax), int64(-dby), 0x40) +
+				mulDiv(int64(day), int64(dbx), 0x40)
+			dotProduct := mulDiv(int64(dax), int64(dbx), 0x40) +
+				mulDiv(int64(day), int64(dby), 0x40)
+			// The discriminant above is actually a cross product of vectors
+			// da and db. Together with the dot product, they can be used as
+			// surrogates for sine and cosine of the angle between the vectors.
+			// Indeed,
+			//       dotproduct   = |da||db|cos(angle)
+			//       discriminant = |da||db|sin(angle)
+			// We use these equations to reject grazing intersections by
+			// thresholding abs(tan(angle)) at 1/19, corresponding to 3 degrees.
+			absDisc, absDotP := discriminant, dotProduct
+			if absDisc < 0 {
+				absDisc = -absDisc
+			}
+			if absDotP < 0 {
+				absDotP = -absDotP
+			}
+			if 19*absDisc > absDotP {
+				val := mulDiv(int64(dx), int64(-dby), 0x40) +
+					mulDiv(int64(dy), int64(dbx), 0x40)
+				rx := mulDiv(val, int64(dax), discriminant)
+				ry := mulDiv(val, int64(day), discriminant)
+				p.X = a0.X + fixed.Int26_6(rx)
+				p.Y = a0.Y + fixed.Int26_6(ry)
+			} else {
+				p.X = (a0.X + a1.X + b0.X + b1.X) / 4
+				p.Y = (a0.Y + a1.Y + b0.Y + b1.Y) / 4
+			}
+			p.Flags |= flagTouchedX | flagTouchedY
+
+		case opSRP0, opSRP1, opSRP2:
+			top--
+			h.gs.rp[opcode-opSRP0] = h.stack[top]
+
+		case opSZP0, opSZP1, opSZP2:
+			top--
+			h.gs.zp[opcode-opSZP0] = h.stack[top]
+
+		case opSZPS:
+			top--
+			h.gs.zp[0] = h.stack[top]
+			h.gs.zp[1] = h.stack[top]
+			h.gs.zp[2] = h.stack[top]
+
+		case opSLOOP:
+			top--
+			// https://developer.apple.com/fonts/TrueType-Reference-Manual/RM05/Chap5.html#SLOOP
+			// says that "Setting the loop variable to zero is an error". In
+			// theory, the inequality on the next line should be "<=" instead
+			// of "<". In practice, some font files' bytecode, such as the '2'
+			// glyph in the DejaVuSansMono.ttf that comes with Ubuntu 14.04,
+			// issue SLOOP with a zero on top of the stack. Just like the C
+			// Freetype code, we allow the zero.
+			if h.stack[top] < 0 {
+				return errors.New("truetype: hinting: invalid data")
+			}
+			h.gs.loop = h.stack[top]
+
+		case opRTG:
+			h.gs.roundPeriod = 1 << 6
+			h.gs.roundPhase = 0
+			h.gs.roundThreshold = 1 << 5
+			h.gs.roundSuper45 = false
+
+		case opRTHG:
+			h.gs.roundPeriod = 1 << 6
+			h.gs.roundPhase = 1 << 5
+			h.gs.roundThreshold = 1 << 5
+			h.gs.roundSuper45 = false
+
+		case opSMD:
+			top--
+			h.gs.minDist = fixed.Int26_6(h.stack[top])
+
+		case opELSE:
+			opcode = 1
+			goto ifelse
+
+		case opJMPR:
+			top--
+			pc += int(h.stack[top])
+			continue
+
+		case opSCVTCI:
+			top--
+			h.gs.controlValueCutIn = fixed.Int26_6(h.stack[top])
+
+		case opSSWCI:
+			top--
+			h.gs.singleWidthCutIn = fixed.Int26_6(h.stack[top])
+
+		case opSSW:
+			top--
+			h.gs.singleWidth = h.font.scale(h.scale * fixed.Int26_6(h.stack[top]))
+
+		case opDUP:
+			if top >= len(h.stack) {
+				return errors.New("truetype: hinting: stack overflow")
+			}
+			h.stack[top] = h.stack[top-1]
+			top++
+
+		case opPOP:
+			top--
+
+		case opCLEAR:
+			top = 0
+
+		case opSWAP:
+			h.stack[top-1], h.stack[top-2] = h.stack[top-2], h.stack[top-1]
+
+		case opDEPTH:
+			if top >= len(h.stack) {
+				return errors.New("truetype: hinting: stack overflow")
+			}
+			h.stack[top] = int32(top)
+			top++
+
+		case opCINDEX, opMINDEX:
+			x := int(h.stack[top-1])
+			if x <= 0 || x >= top {
+				return errors.New("truetype: hinting: invalid data")
+			}
+			h.stack[top-1] = h.stack[top-1-x]
+			if opcode == opMINDEX {
+				copy(h.stack[top-1-x:top-1], h.stack[top-x:top])
+				top--
+			}
+
+		case opALIGNPTS:
+			top -= 2
+			p := h.point(1, current, h.stack[top])
+			q := h.point(0, current, h.stack[top+1])
+			if p == nil || q == nil {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			d := dotProduct(fixed.Int26_6(q.X-p.X), fixed.Int26_6(q.Y-p.Y), h.gs.pv) / 2
+			h.move(p, +d, true)
+			h.move(q, -d, true)
+
+		case opUTP:
+			top--
+			p := h.point(0, current, h.stack[top])
+			if p == nil {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			p.Flags &^= flagTouchedX | flagTouchedY
+
+		case opLOOPCALL, opCALL:
+			if callStackTop >= len(callStack) {
+				return errors.New("truetype: hinting: call stack overflow")
+			}
+			top--
+			f, ok := h.functions[h.stack[top]]
+			if !ok {
+				return errors.New("truetype: hinting: undefined function")
+			}
+			callStack[callStackTop] = callStackEntry{program, pc, 1}
+			if opcode == opLOOPCALL {
+				top--
+				if h.stack[top] == 0 {
+					break
+				}
+				callStack[callStackTop].loopCount = h.stack[top]
+			}
+			callStackTop++
+			program, pc = f, 0
+			continue
+
+		case opFDEF:
+			// Save all bytecode up until the next ENDF.
+			startPC := pc + 1
+		fdefloop:
+			for {
+				pc++
+				if pc >= len(program) {
+					return errors.New("truetype: hinting: unbalanced FDEF")
+				}
+				switch program[pc] {
+				case opFDEF:
+					return errors.New("truetype: hinting: nested FDEF")
+				case opENDF:
+					top--
+					h.functions[h.stack[top]] = program[startPC : pc+1]
+					break fdefloop
+				default:
+					var ok bool
+					pc, ok = skipInstructionPayload(program, pc)
+					if !ok {
+						return errors.New("truetype: hinting: unbalanced FDEF")
+					}
+				}
+			}
+
+		case opENDF:
+			if callStackTop == 0 {
+				return errors.New("truetype: hinting: call stack underflow")
+			}
+			callStackTop--
+			callStack[callStackTop].loopCount--
+			if callStack[callStackTop].loopCount != 0 {
+				callStackTop++
+				pc = 0
+				continue
+			}
+			program, pc = callStack[callStackTop].program, callStack[callStackTop].pc
+
+		case opMDAP0, opMDAP1:
+			top--
+			i := h.stack[top]
+			p := h.point(0, current, i)
+			if p == nil {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			distance := fixed.Int26_6(0)
+			if opcode == opMDAP1 {
+				distance = dotProduct(p.X, p.Y, h.gs.pv)
+				// TODO: metrics compensation.
+				distance = h.round(distance) - distance
+			}
+			h.move(p, distance, true)
+			h.gs.rp[0] = i
+			h.gs.rp[1] = i
+
+		case opIUP0, opIUP1:
+			iupY, mask := opcode == opIUP0, uint32(flagTouchedX)
+			if iupY {
+				mask = flagTouchedY
+			}
+			prevEnd := 0
+			for _, end := range h.ends {
+				for i := prevEnd; i < end; i++ {
+					for i < end && h.points[glyphZone][current][i].Flags&mask == 0 {
+						i++
+					}
+					if i == end {
+						break
+					}
+					firstTouched, curTouched := i, i
+					i++
+					for ; i < end; i++ {
+						if h.points[glyphZone][current][i].Flags&mask != 0 {
+							h.iupInterp(iupY, curTouched+1, i-1, curTouched, i)
+							curTouched = i
+						}
+					}
+					if curTouched == firstTouched {
+						h.iupShift(iupY, prevEnd, end, curTouched)
+					} else {
+						h.iupInterp(iupY, curTouched+1, end-1, curTouched, firstTouched)
+						if firstTouched > 0 {
+							h.iupInterp(iupY, prevEnd, firstTouched-1, curTouched, firstTouched)
+						}
+					}
+				}
+				prevEnd = end
+			}
+
+		case opSHP0, opSHP1:
+			if top < int(h.gs.loop) {
+				return errors.New("truetype: hinting: stack underflow")
+			}
+			_, _, d, ok := h.displacement(opcode&1 == 0)
+			if !ok {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			for ; h.gs.loop != 0; h.gs.loop-- {
+				top--
+				p := h.point(2, current, h.stack[top])
+				if p == nil {
+					return errors.New("truetype: hinting: point out of range")
+				}
+				h.move(p, d, true)
+			}
+			h.gs.loop = 1
+
+		case opSHC0, opSHC1:
+			top--
+			zonePointer, i, d, ok := h.displacement(opcode&1 == 0)
+			if !ok {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			if h.gs.zp[2] == 0 {
+				// TODO: implement this when we have a glyph that does this.
+				return errors.New("hinting: unimplemented SHC instruction")
+			}
+			contour := h.stack[top]
+			if contour < 0 || len(ends) <= int(contour) {
+				return errors.New("truetype: hinting: contour out of range")
+			}
+			j0, j1 := int32(0), int32(h.ends[contour])
+			if contour > 0 {
+				j0 = int32(h.ends[contour-1])
+			}
+			move := h.gs.zp[zonePointer] != h.gs.zp[2]
+			for j := j0; j < j1; j++ {
+				if move || j != i {
+					h.move(h.point(2, current, j), d, true)
+				}
+			}
+
+		case opSHZ0, opSHZ1:
+			top--
+			zonePointer, i, d, ok := h.displacement(opcode&1 == 0)
+			if !ok {
+				return errors.New("truetype: hinting: point out of range")
+			}
+
+			// As per C Freetype, SHZ doesn't move the phantom points, or mark
+			// the points as touched.
+			limit := int32(len(h.points[h.gs.zp[2]][current]))
+			if h.gs.zp[2] == glyphZone {
+				limit -= 4
+			}
+			for j := int32(0); j < limit; j++ {
+				if i != j || h.gs.zp[zonePointer] != h.gs.zp[2] {
+					h.move(h.point(2, current, j), d, false)
+				}
+			}
+
+		case opSHPIX:
+			top--
+			d := fixed.Int26_6(h.stack[top])
+			if top < int(h.gs.loop) {
+				return errors.New("truetype: hinting: stack underflow")
+			}
+			for ; h.gs.loop != 0; h.gs.loop-- {
+				top--
+				p := h.point(2, current, h.stack[top])
+				if p == nil {
+					return errors.New("truetype: hinting: point out of range")
+				}
+				h.move(p, d, true)
+			}
+			h.gs.loop = 1
+
+		case opIP:
+			if top < int(h.gs.loop) {
+				return errors.New("truetype: hinting: stack underflow")
+			}
+			pointType := inFontUnits
+			twilight := h.gs.zp[0] == 0 || h.gs.zp[1] == 0 || h.gs.zp[2] == 0
+			if twilight {
+				pointType = unhinted
+			}
+			p := h.point(1, pointType, h.gs.rp[2])
+			oldP := h.point(0, pointType, h.gs.rp[1])
+			oldRange := dotProduct(p.X-oldP.X, p.Y-oldP.Y, h.gs.dv)
+
+			p = h.point(1, current, h.gs.rp[2])
+			curP := h.point(0, current, h.gs.rp[1])
+			curRange := dotProduct(p.X-curP.X, p.Y-curP.Y, h.gs.pv)
+			for ; h.gs.loop != 0; h.gs.loop-- {
+				top--
+				i := h.stack[top]
+				p = h.point(2, pointType, i)
+				oldDist := dotProduct(p.X-oldP.X, p.Y-oldP.Y, h.gs.dv)
+				p = h.point(2, current, i)
+				curDist := dotProduct(p.X-curP.X, p.Y-curP.Y, h.gs.pv)
+				newDist := fixed.Int26_6(0)
+				if oldDist != 0 {
+					if oldRange != 0 {
+						newDist = fixed.Int26_6(mulDiv(int64(oldDist), int64(curRange), int64(oldRange)))
+					} else {
+						newDist = -oldDist
+					}
+				}
+				h.move(p, newDist-curDist, true)
+			}
+			h.gs.loop = 1
+
+		case opMSIRP0, opMSIRP1:
+			top -= 2
+			i := h.stack[top]
+			distance := fixed.Int26_6(h.stack[top+1])
+
+			// TODO: special case h.gs.zp[1] == 0 in C Freetype.
+			ref := h.point(0, current, h.gs.rp[0])
+			p := h.point(1, current, i)
+			if ref == nil || p == nil {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			curDist := dotProduct(p.X-ref.X, p.Y-ref.Y, h.gs.pv)
+
+			// Set-RP0 bit.
+			if opcode == opMSIRP1 {
+				h.gs.rp[0] = i
+			}
+			h.gs.rp[1] = h.gs.rp[0]
+			h.gs.rp[2] = i
+
+			// Move the point.
+			h.move(p, distance-curDist, true)
+
+		case opALIGNRP:
+			if top < int(h.gs.loop) {
+				return errors.New("truetype: hinting: stack underflow")
+			}
+			ref := h.point(0, current, h.gs.rp[0])
+			if ref == nil {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			for ; h.gs.loop != 0; h.gs.loop-- {
+				top--
+				p := h.point(1, current, h.stack[top])
+				if p == nil {
+					return errors.New("truetype: hinting: point out of range")
+				}
+				h.move(p, -dotProduct(p.X-ref.X, p.Y-ref.Y, h.gs.pv), true)
+			}
+			h.gs.loop = 1
+
+		case opRTDG:
+			h.gs.roundPeriod = 1 << 5
+			h.gs.roundPhase = 0
+			h.gs.roundThreshold = 1 << 4
+			h.gs.roundSuper45 = false
+
+		case opMIAP0, opMIAP1:
+			top -= 2
+			i := h.stack[top]
+			distance := h.getScaledCVT(h.stack[top+1])
+			if h.gs.zp[0] == 0 {
+				p := h.point(0, unhinted, i)
+				q := h.point(0, current, i)
+				p.X = fixed.Int26_6((int64(distance) * int64(h.gs.fv[0])) >> 14)
+				p.Y = fixed.Int26_6((int64(distance) * int64(h.gs.fv[1])) >> 14)
+				*q = *p
+			}
+			p := h.point(0, current, i)
+			oldDist := dotProduct(p.X, p.Y, h.gs.pv)
+			if opcode == opMIAP1 {
+				if fabs(distance-oldDist) > h.gs.controlValueCutIn {
+					distance = oldDist
+				}
+				// TODO: metrics compensation.
+				distance = h.round(distance)
+			}
+			h.move(p, distance-oldDist, true)
+			h.gs.rp[0] = i
+			h.gs.rp[1] = i
+
+		case opNPUSHB:
+			opcode = 0
+			goto push
+
+		case opNPUSHW:
+			opcode = 0x80
+			goto push
+
+		case opWS:
+			top -= 2
+			i := int(h.stack[top])
+			if i < 0 || len(h.store) <= i {
+				return errors.New("truetype: hinting: invalid data")
+			}
+			h.store[i] = h.stack[top+1]
+
+		case opRS:
+			i := int(h.stack[top-1])
+			if i < 0 || len(h.store) <= i {
+				return errors.New("truetype: hinting: invalid data")
+			}
+			h.stack[top-1] = h.store[i]
+
+		case opWCVTP:
+			top -= 2
+			h.setScaledCVT(h.stack[top], fixed.Int26_6(h.stack[top+1]))
+
+		case opRCVT:
+			h.stack[top-1] = int32(h.getScaledCVT(h.stack[top-1]))
+
+		case opGC0, opGC1:
+			i := h.stack[top-1]
+			if opcode == opGC0 {
+				p := h.point(2, current, i)
+				h.stack[top-1] = int32(dotProduct(p.X, p.Y, h.gs.pv))
+			} else {
+				p := h.point(2, unhinted, i)
+				// Using dv as per C Freetype.
+				h.stack[top-1] = int32(dotProduct(p.X, p.Y, h.gs.dv))
+			}
+
+		case opSCFS:
+			top -= 2
+			i := h.stack[top]
+			p := h.point(2, current, i)
+			if p == nil {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			c := dotProduct(p.X, p.Y, h.gs.pv)
+			h.move(p, fixed.Int26_6(h.stack[top+1])-c, true)
+			if h.gs.zp[2] != 0 {
+				break
+			}
+			q := h.point(2, unhinted, i)
+			if q == nil {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			q.X = p.X
+			q.Y = p.Y
+
+		case opMD0, opMD1:
+			top--
+			pt, v, scale := pointType(0), [2]f2dot14{}, false
+			if opcode == opMD0 {
+				pt = current
+				v = h.gs.pv
+			} else if h.gs.zp[0] == 0 || h.gs.zp[1] == 0 {
+				pt = unhinted
+				v = h.gs.dv
+			} else {
+				pt = inFontUnits
+				v = h.gs.dv
+				scale = true
+			}
+			p := h.point(0, pt, h.stack[top-1])
+			q := h.point(1, pt, h.stack[top])
+			if p == nil || q == nil {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			d := int32(dotProduct(p.X-q.X, p.Y-q.Y, v))
+			if scale {
+				d = int32(int64(d*int32(h.scale)) / int64(h.font.fUnitsPerEm))
+			}
+			h.stack[top-1] = d
+
+		case opMPPEM, opMPS:
+			if top >= len(h.stack) {
+				return errors.New("truetype: hinting: stack overflow")
+			}
+			// For MPS, point size should be irrelevant; we return the PPEM.
+			h.stack[top] = int32(h.scale) >> 6
+			top++
+
+		case opFLIPON, opFLIPOFF:
+			h.gs.autoFlip = opcode == opFLIPON
+
+		case opDEBUG:
+			// No-op.
+
+		case opLT:
+			top--
+			h.stack[top-1] = bool2int32(h.stack[top-1] < h.stack[top])
+
+		case opLTEQ:
+			top--
+			h.stack[top-1] = bool2int32(h.stack[top-1] <= h.stack[top])
+
+		case opGT:
+			top--
+			h.stack[top-1] = bool2int32(h.stack[top-1] > h.stack[top])
+
+		case opGTEQ:
+			top--
+			h.stack[top-1] = bool2int32(h.stack[top-1] >= h.stack[top])
+
+		case opEQ:
+			top--
+			h.stack[top-1] = bool2int32(h.stack[top-1] == h.stack[top])
+
+		case opNEQ:
+			top--
+			h.stack[top-1] = bool2int32(h.stack[top-1] != h.stack[top])
+
+		case opODD, opEVEN:
+			i := h.round(fixed.Int26_6(h.stack[top-1])) >> 6
+			h.stack[top-1] = int32(i&1) ^ int32(opcode-opODD)
+
+		case opIF:
+			top--
+			if h.stack[top] == 0 {
+				opcode = 0
+				goto ifelse
+			}
+
+		case opEIF:
+			// No-op.
+
+		case opAND:
+			top--
+			h.stack[top-1] = bool2int32(h.stack[top-1] != 0 && h.stack[top] != 0)
+
+		case opOR:
+			top--
+			h.stack[top-1] = bool2int32(h.stack[top-1]|h.stack[top] != 0)
+
+		case opNOT:
+			h.stack[top-1] = bool2int32(h.stack[top-1] == 0)
+
+		case opDELTAP1:
+			goto delta
+
+		case opSDB:
+			top--
+			h.gs.deltaBase = h.stack[top]
+
+		case opSDS:
+			top--
+			h.gs.deltaShift = h.stack[top]
+
+		case opADD:
+			top--
+			h.stack[top-1] += h.stack[top]
+
+		case opSUB:
+			top--
+			h.stack[top-1] -= h.stack[top]
+
+		case opDIV:
+			top--
+			if h.stack[top] == 0 {
+				return errors.New("truetype: hinting: division by zero")
+			}
+			h.stack[top-1] = int32(fdiv(fixed.Int26_6(h.stack[top-1]), fixed.Int26_6(h.stack[top])))
+
+		case opMUL:
+			top--
+			h.stack[top-1] = int32(fmul(fixed.Int26_6(h.stack[top-1]), fixed.Int26_6(h.stack[top])))
+
+		case opABS:
+			if h.stack[top-1] < 0 {
+				h.stack[top-1] = -h.stack[top-1]
+			}
+
+		case opNEG:
+			h.stack[top-1] = -h.stack[top-1]
+
+		case opFLOOR:
+			h.stack[top-1] &^= 63
+
+		case opCEILING:
+			h.stack[top-1] += 63
+			h.stack[top-1] &^= 63
+
+		case opROUND00, opROUND01, opROUND10, opROUND11:
+			// The four flavors of opROUND are equivalent. See the comment below on
+			// opNROUND for the rationale.
+			h.stack[top-1] = int32(h.round(fixed.Int26_6(h.stack[top-1])))
+
+		case opNROUND00, opNROUND01, opNROUND10, opNROUND11:
+			// No-op. The spec says to add one of four "compensations for the engine
+			// characteristics", to cater for things like "different dot-size printers".
+			// https://developer.apple.com/fonts/TTRefMan/RM02/Chap2.html#engine_compensation
+			// This code does not implement engine compensation, as we don't expect to
+			// be used to output on dot-matrix printers.
+
+		case opWCVTF:
+			top -= 2
+			h.setScaledCVT(h.stack[top], h.font.scale(h.scale*fixed.Int26_6(h.stack[top+1])))
+
+		case opDELTAP2, opDELTAP3, opDELTAC1, opDELTAC2, opDELTAC3:
+			goto delta
+
+		case opSROUND, opS45ROUND:
+			top--
+			switch (h.stack[top] >> 6) & 0x03 {
+			case 0:
+				h.gs.roundPeriod = 1 << 5
+			case 1, 3:
+				h.gs.roundPeriod = 1 << 6
+			case 2:
+				h.gs.roundPeriod = 1 << 7
+			}
+			h.gs.roundSuper45 = opcode == opS45ROUND
+			if h.gs.roundSuper45 {
+				// The spec says to multiply by √2, but the C Freetype code says 1/√2.
+				// We go with 1/√2.
+				h.gs.roundPeriod *= 46341
+				h.gs.roundPeriod /= 65536
+			}
+			h.gs.roundPhase = h.gs.roundPeriod * fixed.Int26_6((h.stack[top]>>4)&0x03) / 4
+			if x := h.stack[top] & 0x0f; x != 0 {
+				h.gs.roundThreshold = h.gs.roundPeriod * fixed.Int26_6(x-4) / 8
+			} else {
+				h.gs.roundThreshold = h.gs.roundPeriod - 1
+			}
+
+		case opJROT:
+			top -= 2
+			if h.stack[top+1] != 0 {
+				pc += int(h.stack[top])
+				continue
+			}
+
+		case opJROF:
+			top -= 2
+			if h.stack[top+1] == 0 {
+				pc += int(h.stack[top])
+				continue
+			}
+
+		case opROFF:
+			h.gs.roundPeriod = 0
+			h.gs.roundPhase = 0
+			h.gs.roundThreshold = 0
+			h.gs.roundSuper45 = false
+
+		case opRUTG:
+			h.gs.roundPeriod = 1 << 6
+			h.gs.roundPhase = 0
+			h.gs.roundThreshold = 1<<6 - 1
+			h.gs.roundSuper45 = false
+
+		case opRDTG:
+			h.gs.roundPeriod = 1 << 6
+			h.gs.roundPhase = 0
+			h.gs.roundThreshold = 0
+			h.gs.roundSuper45 = false
+
+		case opSANGW, opAA:
+			// These ops are "anachronistic" and no longer used.
+			top--
+
+		case opFLIPPT:
+			if top < int(h.gs.loop) {
+				return errors.New("truetype: hinting: stack underflow")
+			}
+			points := h.points[glyphZone][current]
+			for ; h.gs.loop != 0; h.gs.loop-- {
+				top--
+				i := h.stack[top]
+				if i < 0 || len(points) <= int(i) {
+					return errors.New("truetype: hinting: point out of range")
+				}
+				points[i].Flags ^= flagOnCurve
+			}
+			h.gs.loop = 1
+
+		case opFLIPRGON, opFLIPRGOFF:
+			top -= 2
+			i, j, points := h.stack[top], h.stack[top+1], h.points[glyphZone][current]
+			if i < 0 || len(points) <= int(i) || j < 0 || len(points) <= int(j) {
+				return errors.New("truetype: hinting: point out of range")
+			}
+			for ; i <= j; i++ {
+				if opcode == opFLIPRGON {
+					points[i].Flags |= flagOnCurve
+				} else {
+					points[i].Flags &^= flagOnCurve
+				}
+			}
+
+		case opSCANCTRL:
+			// We do not support dropout control, as we always rasterize grayscale glyphs.
+			top--
+
+		case opSDPVTL0, opSDPVTL1:
+			top -= 2
+			for i := 0; i < 2; i++ {
+				pt := unhinted
+				if i != 0 {
+					pt = current
+				}
+				p := h.point(1, pt, h.stack[top])
+				q := h.point(2, pt, h.stack[top+1])
+				if p == nil || q == nil {
+					return errors.New("truetype: hinting: point out of range")
+				}
+				dx := f2dot14(p.X - q.X)
+				dy := f2dot14(p.Y - q.Y)
+				if dx == 0 && dy == 0 {
+					dx = 0x4000
+				} else if opcode&1 != 0 {
+					// Counter-clockwise rotation.
+					dx, dy = -dy, dx
+				}
+				if i == 0 {
+					h.gs.dv = normalize(dx, dy)
+				} else {
+					h.gs.pv = normalize(dx, dy)
+				}
+			}
+
+		case opGETINFO:
+			res := int32(0)
+			if h.stack[top-1]&(1<<0) != 0 {
+				// Set the engine version. We hard-code this to 35, the same as
+				// the C freetype code, which says that "Version~35 corresponds
+				// to MS rasterizer v.1.7 as used e.g. in Windows~98".
+				res |= 35
+			}
+			if h.stack[top-1]&(1<<5) != 0 {
+				// Set that we support grayscale.
+				res |= 1 << 12
+			}
+			// We set no other bits, as we do not support rotated or stretched glyphs.
+			h.stack[top-1] = res
+
+		case opIDEF:
+			// IDEF is for ancient versions of the bytecode interpreter, and is no longer used.
+			return errors.New("truetype: hinting: unsupported IDEF instruction")
+
+		case opROLL:
+			h.stack[top-1], h.stack[top-3], h.stack[top-2] =
+				h.stack[top-3], h.stack[top-2], h.stack[top-1]
+
+		case opMAX:
+			top--
+			if h.stack[top-1] < h.stack[top] {
+				h.stack[top-1] = h.stack[top]
+			}
+
+		case opMIN:
+			top--
+			if h.stack[top-1] > h.stack[top] {
+				h.stack[top-1] = h.stack[top]
+			}
+
+		case opSCANTYPE:
+			// We do not support dropout control, as we always rasterize grayscale glyphs.
+			top--
+
+		case opINSTCTRL:
+			// TODO: support instruction execution control? It seems rare, and even when
+			// nominally used (e.g. Source Sans Pro), it seems conditional on extreme or
+			// unusual rasterization conditions. For example, the code snippet at
+			// https://developer.apple.com/fonts/TTRefMan/RM05/Chap5.html#INSTCTRL
+			// uses INSTCTRL when grid-fitting a rotated or stretched glyph, but
+			// freetype-go does not support rotated or stretched glyphs.
+			top -= 2
+
+		default:
+			if opcode < opPUSHB000 {
+				return errors.New("truetype: hinting: unrecognized instruction")
+			}
+
+			if opcode < opMDRP00000 {
+				// PUSHxxxx opcode.
+
+				if opcode < opPUSHW000 {
+					opcode -= opPUSHB000 - 1
+				} else {
+					opcode -= opPUSHW000 - 1 - 0x80
+				}
+				goto push
+			}
+
+			if opcode < opMIRP00000 {
+				// MDRPxxxxx opcode.
+
+				top--
+				i := h.stack[top]
+				ref := h.point(0, current, h.gs.rp[0])
+				p := h.point(1, current, i)
+				if ref == nil || p == nil {
+					return errors.New("truetype: hinting: point out of range")
+				}
+
+				oldDist := fixed.Int26_6(0)
+				if h.gs.zp[0] == 0 || h.gs.zp[1] == 0 {
+					p0 := h.point(1, unhinted, i)
+					p1 := h.point(0, unhinted, h.gs.rp[0])
+					oldDist = dotProduct(p0.X-p1.X, p0.Y-p1.Y, h.gs.dv)
+				} else {
+					p0 := h.point(1, inFontUnits, i)
+					p1 := h.point(0, inFontUnits, h.gs.rp[0])
+					oldDist = dotProduct(p0.X-p1.X, p0.Y-p1.Y, h.gs.dv)
+					oldDist = h.font.scale(h.scale * oldDist)
+				}
+
+				// Single-width cut-in test.
+				if x := fabs(oldDist - h.gs.singleWidth); x < h.gs.singleWidthCutIn {
+					if oldDist >= 0 {
+						oldDist = +h.gs.singleWidth
+					} else {
+						oldDist = -h.gs.singleWidth
+					}
+				}
+
+				// Rounding bit.
+				// TODO: metrics compensation.
+				distance := oldDist
+				if opcode&0x04 != 0 {
+					distance = h.round(oldDist)
+				}
+
+				// Minimum distance bit.
+				if opcode&0x08 != 0 {
+					if oldDist >= 0 {
+						if distance < h.gs.minDist {
+							distance = h.gs.minDist
+						}
+					} else {
+						if distance > -h.gs.minDist {
+							distance = -h.gs.minDist
+						}
+					}
+				}
+
+				// Set-RP0 bit.
+				h.gs.rp[1] = h.gs.rp[0]
+				h.gs.rp[2] = i
+				if opcode&0x10 != 0 {
+					h.gs.rp[0] = i
+				}
+
+				// Move the point.
+				oldDist = dotProduct(p.X-ref.X, p.Y-ref.Y, h.gs.pv)
+				h.move(p, distance-oldDist, true)
+
+			} else {
+				// MIRPxxxxx opcode.
+
+				top -= 2
+				i := h.stack[top]
+				cvtDist := h.getScaledCVT(h.stack[top+1])
+				if fabs(cvtDist-h.gs.singleWidth) < h.gs.singleWidthCutIn {
+					if cvtDist >= 0 {
+						cvtDist = +h.gs.singleWidth
+					} else {
+						cvtDist = -h.gs.singleWidth
+					}
+				}
+
+				if h.gs.zp[1] == 0 {
+					// TODO: implement once we have a .ttf file that triggers
+					// this, so that we can step through C's freetype.
+					return errors.New("truetype: hinting: unimplemented twilight point adjustment")
+				}
+
+				ref := h.point(0, unhinted, h.gs.rp[0])
+				p := h.point(1, unhinted, i)
+				if ref == nil || p == nil {
+					return errors.New("truetype: hinting: point out of range")
+				}
+				oldDist := dotProduct(p.X-ref.X, p.Y-ref.Y, h.gs.dv)
+
+				ref = h.point(0, current, h.gs.rp[0])
+				p = h.point(1, current, i)
+				if ref == nil || p == nil {
+					return errors.New("truetype: hinting: point out of range")
+				}
+				curDist := dotProduct(p.X-ref.X, p.Y-ref.Y, h.gs.pv)
+
+				if h.gs.autoFlip && oldDist^cvtDist < 0 {
+					cvtDist = -cvtDist
+				}
+
+				// Rounding bit.
+				// TODO: metrics compensation.
+				distance := cvtDist
+				if opcode&0x04 != 0 {
+					// The CVT value is only used if close enough to oldDist.
+					if (h.gs.zp[0] == h.gs.zp[1]) &&
+						(fabs(cvtDist-oldDist) > h.gs.controlValueCutIn) {
+
+						distance = oldDist
+					}
+					distance = h.round(distance)
+				}
+
+				// Minimum distance bit.
+				if opcode&0x08 != 0 {
+					if oldDist >= 0 {
+						if distance < h.gs.minDist {
+							distance = h.gs.minDist
+						}
+					} else {
+						if distance > -h.gs.minDist {
+							distance = -h.gs.minDist
+						}
+					}
+				}
+
+				// Set-RP0 bit.
+				h.gs.rp[1] = h.gs.rp[0]
+				h.gs.rp[2] = i
+				if opcode&0x10 != 0 {
+					h.gs.rp[0] = i
+				}
+
+				// Move the point.
+				h.move(p, distance-curDist, true)
+			}
+		}
+		pc++
+		continue
+
+	ifelse:
+		// Skip past bytecode until the next ELSE (if opcode == 0) or the
+		// next EIF (for all opcodes). Opcode == 0 means that we have come
+		// from an IF. Opcode == 1 means that we have come from an ELSE.
+		{
+		ifelseloop:
+			for depth := 0; ; {
+				pc++
+				if pc >= len(program) {
+					return errors.New("truetype: hinting: unbalanced IF or ELSE")
+				}
+				switch program[pc] {
+				case opIF:
+					depth++
+				case opELSE:
+					if depth == 0 && opcode == 0 {
+						break ifelseloop
+					}
+				case opEIF:
+					depth--
+					if depth < 0 {
+						break ifelseloop
+					}
+				default:
+					var ok bool
+					pc, ok = skipInstructionPayload(program, pc)
+					if !ok {
+						return errors.New("truetype: hinting: unbalanced IF or ELSE")
+					}
+				}
+			}
+			pc++
+			continue
+		}
+
+	push:
+		// Push n elements from the program to the stack, where n is the low 7 bits of
+		// opcode. If the low 7 bits are zero, then n is the next byte from the program.
+		// The high bit being 0 means that the elements are zero-extended bytes.
+		// The high bit being 1 means that the elements are sign-extended words.
+		{
+			width := 1
+			if opcode&0x80 != 0 {
+				opcode &^= 0x80
+				width = 2
+			}
+			if opcode == 0 {
+				pc++
+				if pc >= len(program) {
+					return errors.New("truetype: hinting: insufficient data")
+				}
+				opcode = program[pc]
+			}
+			pc++
+			if top+int(opcode) > len(h.stack) {
+				return errors.New("truetype: hinting: stack overflow")
+			}
+			if pc+width*int(opcode) > len(program) {
+				return errors.New("truetype: hinting: insufficient data")
+			}
+			for ; opcode > 0; opcode-- {
+				if width == 1 {
+					h.stack[top] = int32(program[pc])
+				} else {
+					h.stack[top] = int32(int8(program[pc]))<<8 | int32(program[pc+1])
+				}
+				top++
+				pc += width
+			}
+			continue
+		}
+
+	delta:
+		{
+			if opcode >= opDELTAC1 && !h.scaledCVTInitialized {
+				h.initializeScaledCVT()
+			}
+			top--
+			n := h.stack[top]
+			if int32(top) < 2*n {
+				return errors.New("truetype: hinting: stack underflow")
+			}
+			for ; n > 0; n-- {
+				top -= 2
+				b := h.stack[top]
+				c := (b & 0xf0) >> 4
+				switch opcode {
+				case opDELTAP2, opDELTAC2:
+					c += 16
+				case opDELTAP3, opDELTAC3:
+					c += 32
+				}
+				c += h.gs.deltaBase
+				if ppem := (int32(h.scale) + 1<<5) >> 6; ppem != c {
+					continue
+				}
+				b = (b & 0x0f) - 8
+				if b >= 0 {
+					b++
+				}
+				b = b * 64 / (1 << uint32(h.gs.deltaShift))
+				if opcode >= opDELTAC1 {
+					a := h.stack[top+1]
+					if a < 0 || len(h.scaledCVT) <= int(a) {
+						return errors.New("truetype: hinting: index out of range")
+					}
+					h.scaledCVT[a] += fixed.Int26_6(b)
+				} else {
+					p := h.point(0, current, h.stack[top+1])
+					if p == nil {
+						return errors.New("truetype: hinting: point out of range")
+					}
+					h.move(p, fixed.Int26_6(b), true)
+				}
+			}
+			pc++
+			continue
+		}
+	}
+	return nil
+}
+
+func (h *hinter) initializeScaledCVT() {
+	h.scaledCVTInitialized = true
+	if n := len(h.font.cvt) / 2; n <= cap(h.scaledCVT) {
+		h.scaledCVT = h.scaledCVT[:n]
+	} else {
+		if n < 32 {
+			n = 32
+		}
+		h.scaledCVT = make([]fixed.Int26_6, len(h.font.cvt)/2, n)
+	}
+	for i := range h.scaledCVT {
+		unscaled := uint16(h.font.cvt[2*i])<<8 | uint16(h.font.cvt[2*i+1])
+		h.scaledCVT[i] = h.font.scale(h.scale * fixed.Int26_6(int16(unscaled)))
+	}
+}
+
+// getScaledCVT returns the scaled value from the font's Control Value Table.
+func (h *hinter) getScaledCVT(i int32) fixed.Int26_6 {
+	if !h.scaledCVTInitialized {
+		h.initializeScaledCVT()
+	}
+	if i < 0 || len(h.scaledCVT) <= int(i) {
+		return 0
+	}
+	return h.scaledCVT[i]
+}
+
+// setScaledCVT overrides the scaled value from the font's Control Value Table.
+func (h *hinter) setScaledCVT(i int32, v fixed.Int26_6) {
+	if !h.scaledCVTInitialized {
+		h.initializeScaledCVT()
+	}
+	if i < 0 || len(h.scaledCVT) <= int(i) {
+		return
+	}
+	h.scaledCVT[i] = v
+}
+
+func (h *hinter) point(zonePointer uint32, pt pointType, i int32) *Point {
+	points := h.points[h.gs.zp[zonePointer]][pt]
+	if i < 0 || len(points) <= int(i) {
+		return nil
+	}
+	return &points[i]
+}
+
+func (h *hinter) move(p *Point, distance fixed.Int26_6, touch bool) {
+	fvx := int64(h.gs.fv[0])
+	pvx := int64(h.gs.pv[0])
+	if fvx == 0x4000 && pvx == 0x4000 {
+		p.X += fixed.Int26_6(distance)
+		if touch {
+			p.Flags |= flagTouchedX
+		}
+		return
+	}
+
+	fvy := int64(h.gs.fv[1])
+	pvy := int64(h.gs.pv[1])
+	if fvy == 0x4000 && pvy == 0x4000 {
+		p.Y += fixed.Int26_6(distance)
+		if touch {
+			p.Flags |= flagTouchedY
+		}
+		return
+	}
+
+	fvDotPv := (fvx*pvx + fvy*pvy) >> 14
+
+	if fvx != 0 {
+		p.X += fixed.Int26_6(mulDiv(fvx, int64(distance), fvDotPv))
+		if touch {
+			p.Flags |= flagTouchedX
+		}
+	}
+
+	if fvy != 0 {
+		p.Y += fixed.Int26_6(mulDiv(fvy, int64(distance), fvDotPv))
+		if touch {
+			p.Flags |= flagTouchedY
+		}
+	}
+}
+
+func (h *hinter) iupInterp(interpY bool, p1, p2, ref1, ref2 int) {
+	if p1 > p2 {
+		return
+	}
+	if ref1 >= len(h.points[glyphZone][current]) ||
+		ref2 >= len(h.points[glyphZone][current]) {
+		return
+	}
+
+	var ifu1, ifu2 fixed.Int26_6
+	if interpY {
+		ifu1 = h.points[glyphZone][inFontUnits][ref1].Y
+		ifu2 = h.points[glyphZone][inFontUnits][ref2].Y
+	} else {
+		ifu1 = h.points[glyphZone][inFontUnits][ref1].X
+		ifu2 = h.points[glyphZone][inFontUnits][ref2].X
+	}
+	if ifu1 > ifu2 {
+		ifu1, ifu2 = ifu2, ifu1
+		ref1, ref2 = ref2, ref1
+	}
+
+	var unh1, unh2, delta1, delta2 fixed.Int26_6
+	if interpY {
+		unh1 = h.points[glyphZone][unhinted][ref1].Y
+		unh2 = h.points[glyphZone][unhinted][ref2].Y
+		delta1 = h.points[glyphZone][current][ref1].Y - unh1
+		delta2 = h.points[glyphZone][current][ref2].Y - unh2
+	} else {
+		unh1 = h.points[glyphZone][unhinted][ref1].X
+		unh2 = h.points[glyphZone][unhinted][ref2].X
+		delta1 = h.points[glyphZone][current][ref1].X - unh1
+		delta2 = h.points[glyphZone][current][ref2].X - unh2
+	}
+
+	var xy, ifuXY fixed.Int26_6
+	if ifu1 == ifu2 {
+		for i := p1; i <= p2; i++ {
+			if interpY {
+				xy = h.points[glyphZone][unhinted][i].Y
+			} else {
+				xy = h.points[glyphZone][unhinted][i].X
+			}
+
+			if xy <= unh1 {
+				xy += delta1
+			} else {
+				xy += delta2
+			}
+
+			if interpY {
+				h.points[glyphZone][current][i].Y = xy
+			} else {
+				h.points[glyphZone][current][i].X = xy
+			}
+		}
+		return
+	}
+
+	scale, scaleOK := int64(0), false
+	for i := p1; i <= p2; i++ {
+		if interpY {
+			xy = h.points[glyphZone][unhinted][i].Y
+			ifuXY = h.points[glyphZone][inFontUnits][i].Y
+		} else {
+			xy = h.points[glyphZone][unhinted][i].X
+			ifuXY = h.points[glyphZone][inFontUnits][i].X
+		}
+
+		if xy <= unh1 {
+			xy += delta1
+		} else if xy >= unh2 {
+			xy += delta2
+		} else {
+			if !scaleOK {
+				scaleOK = true
+				scale = mulDiv(int64(unh2+delta2-unh1-delta1), 0x10000, int64(ifu2-ifu1))
+			}
+			numer := int64(ifuXY-ifu1) * scale
+			if numer >= 0 {
+				numer += 0x8000
+			} else {
+				numer -= 0x8000
+			}
+			xy = unh1 + delta1 + fixed.Int26_6(numer/0x10000)
+		}
+
+		if interpY {
+			h.points[glyphZone][current][i].Y = xy
+		} else {
+			h.points[glyphZone][current][i].X = xy
+		}
+	}
+}
+
+func (h *hinter) iupShift(interpY bool, p1, p2, p int) {
+	var delta fixed.Int26_6
+	if interpY {
+		delta = h.points[glyphZone][current][p].Y - h.points[glyphZone][unhinted][p].Y
+	} else {
+		delta = h.points[glyphZone][current][p].X - h.points[glyphZone][unhinted][p].X
+	}
+	if delta == 0 {
+		return
+	}
+	for i := p1; i < p2; i++ {
+		if i == p {
+			continue
+		}
+		if interpY {
+			h.points[glyphZone][current][i].Y += delta
+		} else {
+			h.points[glyphZone][current][i].X += delta
+		}
+	}
+}
+
+func (h *hinter) displacement(useZP1 bool) (zonePointer uint32, i int32, d fixed.Int26_6, ok bool) {
+	zonePointer, i = uint32(0), h.gs.rp[1]
+	if useZP1 {
+		zonePointer, i = 1, h.gs.rp[2]
+	}
+	p := h.point(zonePointer, current, i)
+	q := h.point(zonePointer, unhinted, i)
+	if p == nil || q == nil {
+		return 0, 0, 0, false
+	}
+	d = dotProduct(p.X-q.X, p.Y-q.Y, h.gs.pv)
+	return zonePointer, i, d, true
+}
+
+// skipInstructionPayload increments pc by the extra data that follows a
+// variable length PUSHB or PUSHW instruction.
+func skipInstructionPayload(program []byte, pc int) (newPC int, ok bool) {
+	switch program[pc] {
+	case opNPUSHB:
+		pc++
+		if pc >= len(program) {
+			return 0, false
+		}
+		pc += int(program[pc])
+	case opNPUSHW:
+		pc++
+		if pc >= len(program) {
+			return 0, false
+		}
+		pc += 2 * int(program[pc])
+	case opPUSHB000, opPUSHB001, opPUSHB010, opPUSHB011,
+		opPUSHB100, opPUSHB101, opPUSHB110, opPUSHB111:
+		pc += int(program[pc] - (opPUSHB000 - 1))
+	case opPUSHW000, opPUSHW001, opPUSHW010, opPUSHW011,
+		opPUSHW100, opPUSHW101, opPUSHW110, opPUSHW111:
+		pc += 2 * int(program[pc]-(opPUSHW000-1))
+	}
+	return pc, true
+}
+
+// f2dot14 is a 2.14 fixed point number.
+type f2dot14 int16
+
+func normalize(x, y f2dot14) [2]f2dot14 {
+	fx, fy := float64(x), float64(y)
+	l := 0x4000 / math.Hypot(fx, fy)
+	fx *= l
+	if fx >= 0 {
+		fx += 0.5
+	} else {
+		fx -= 0.5
+	}
+	fy *= l
+	if fy >= 0 {
+		fy += 0.5
+	} else {
+		fy -= 0.5
+	}
+	return [2]f2dot14{f2dot14(fx), f2dot14(fy)}
+}
+
+// fabs returns abs(x) in 26.6 fixed point arithmetic.
+func fabs(x fixed.Int26_6) fixed.Int26_6 {
+	if x < 0 {
+		return -x
+	}
+	return x
+}
+
+// fdiv returns x/y in 26.6 fixed point arithmetic.
+func fdiv(x, y fixed.Int26_6) fixed.Int26_6 {
+	return fixed.Int26_6((int64(x) << 6) / int64(y))
+}
+
+// fmul returns x*y in 26.6 fixed point arithmetic.
+func fmul(x, y fixed.Int26_6) fixed.Int26_6 {
+	return fixed.Int26_6((int64(x)*int64(y) + 1<<5) >> 6)
+}
+
+// dotProduct returns the dot product of [x, y] and q. It is almost the same as
+//	px := int64(x)
+//	py := int64(y)
+//	qx := int64(q[0])
+//	qy := int64(q[1])
+//	return fixed.Int26_6((px*qx + py*qy + 1<<13) >> 14)
+// except that the computation is done with 32-bit integers to produce exactly
+// the same rounding behavior as C Freetype.
+func dotProduct(x, y fixed.Int26_6, q [2]f2dot14) fixed.Int26_6 {
+	// Compute x*q[0] as 64-bit value.
+	l := uint32((int32(x) & 0xFFFF) * int32(q[0]))
+	m := (int32(x) >> 16) * int32(q[0])
+
+	lo1 := l + (uint32(m) << 16)
+	hi1 := (m >> 16) + (int32(l) >> 31) + bool2int32(lo1 < l)
+
+	// Compute y*q[1] as 64-bit value.
+	l = uint32((int32(y) & 0xFFFF) * int32(q[1]))
+	m = (int32(y) >> 16) * int32(q[1])
+
+	lo2 := l + (uint32(m) << 16)
+	hi2 := (m >> 16) + (int32(l) >> 31) + bool2int32(lo2 < l)
+
+	// Add them.
+	lo := lo1 + lo2
+	hi := hi1 + hi2 + bool2int32(lo < lo1)
+
+	// Divide the result by 2^14 with rounding.
+	s := hi >> 31
+	l = lo + uint32(s)
+	hi += s + bool2int32(l < lo)
+	lo = l
+
+	l = lo + 0x2000
+	hi += bool2int32(l < lo)
+
+	return fixed.Int26_6((uint32(hi) << 18) | (l >> 14))
+}
+
+// mulDiv returns x*y/z, rounded to the nearest integer.
+func mulDiv(x, y, z int64) int64 {
+	xy := x * y
+	if z < 0 {
+		xy, z = -xy, -z
+	}
+	if xy >= 0 {
+		xy += z / 2
+	} else {
+		xy -= z / 2
+	}
+	return xy / z
+}
+
+// round rounds the given number. The rounding algorithm is described at
+// https://developer.apple.com/fonts/TTRefMan/RM02/Chap2.html#rounding
+func (h *hinter) round(x fixed.Int26_6) fixed.Int26_6 {
+	if h.gs.roundPeriod == 0 {
+		// Rounding is off.
+		return x
+	}
+	if x >= 0 {
+		ret := x - h.gs.roundPhase + h.gs.roundThreshold
+		if h.gs.roundSuper45 {
+			ret /= h.gs.roundPeriod
+			ret *= h.gs.roundPeriod
+		} else {
+			ret &= -h.gs.roundPeriod
+		}
+		if x != 0 && ret < 0 {
+			ret = 0
+		}
+		return ret + h.gs.roundPhase
+	}
+	ret := -x - h.gs.roundPhase + h.gs.roundThreshold
+	if h.gs.roundSuper45 {
+		ret /= h.gs.roundPeriod
+		ret *= h.gs.roundPeriod
+	} else {
+		ret &= -h.gs.roundPeriod
+	}
+	if ret < 0 {
+		ret = 0
+	}
+	return -ret - h.gs.roundPhase
+}
+
+func bool2int32(b bool) int32 {
+	if b {
+		return 1
+	}
+	return 0
+}
diff --git a/server/vendor/github.com/golang/freetype/truetype/opcodes.go b/server/vendor/github.com/golang/freetype/truetype/opcodes.go
new file mode 100644
index 000000000..1880e1e63
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/truetype/opcodes.go
@@ -0,0 +1,289 @@
+// Copyright 2012 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+package truetype
+
+// The Truetype opcodes are summarized at
+// https://developer.apple.com/fonts/TTRefMan/RM07/appendixA.html
+
+const (
+	opSVTCA0    = 0x00 // Set freedom and projection Vectors To Coordinate Axis
+	opSVTCA1    = 0x01 // .
+	opSPVTCA0   = 0x02 // Set Projection Vector To Coordinate Axis
+	opSPVTCA1   = 0x03 // .
+	opSFVTCA0   = 0x04 // Set Freedom Vector to Coordinate Axis
+	opSFVTCA1   = 0x05 // .
+	opSPVTL0    = 0x06 // Set Projection Vector To Line
+	opSPVTL1    = 0x07 // .
+	opSFVTL0    = 0x08 // Set Freedom Vector To Line
+	opSFVTL1    = 0x09 // .
+	opSPVFS     = 0x0a // Set Projection Vector From Stack
+	opSFVFS     = 0x0b // Set Freedom Vector From Stack
+	opGPV       = 0x0c // Get Projection Vector
+	opGFV       = 0x0d // Get Freedom Vector
+	opSFVTPV    = 0x0e // Set Freedom Vector To Projection Vector
+	opISECT     = 0x0f // moves point p to the InterSECTion of two lines
+	opSRP0      = 0x10 // Set Reference Point 0
+	opSRP1      = 0x11 // Set Reference Point 1
+	opSRP2      = 0x12 // Set Reference Point 2
+	opSZP0      = 0x13 // Set Zone Pointer 0
+	opSZP1      = 0x14 // Set Zone Pointer 1
+	opSZP2      = 0x15 // Set Zone Pointer 2
+	opSZPS      = 0x16 // Set Zone PointerS
+	opSLOOP     = 0x17 // Set LOOP variable
+	opRTG       = 0x18 // Round To Grid
+	opRTHG      = 0x19 // Round To Half Grid
+	opSMD       = 0x1a // Set Minimum Distance
+	opELSE      = 0x1b // ELSE clause
+	opJMPR      = 0x1c // JuMP Relative
+	opSCVTCI    = 0x1d // Set Control Value Table Cut-In
+	opSSWCI     = 0x1e // Set Single Width Cut-In
+	opSSW       = 0x1f // Set Single Width
+	opDUP       = 0x20 // DUPlicate top stack element
+	opPOP       = 0x21 // POP top stack element
+	opCLEAR     = 0x22 // CLEAR the stack
+	opSWAP      = 0x23 // SWAP the top two elements on the stack
+	opDEPTH     = 0x24 // DEPTH of the stack
+	opCINDEX    = 0x25 // Copy the INDEXed element to the top of the stack
+	opMINDEX    = 0x26 // Move the INDEXed element to the top of the stack
+	opALIGNPTS  = 0x27 // ALIGN PoinTS
+	op_0x28     = 0x28 // deprecated
+	opUTP       = 0x29 // UnTouch Point
+	opLOOPCALL  = 0x2a // LOOP and CALL function
+	opCALL      = 0x2b // CALL function
+	opFDEF      = 0x2c // Function DEFinition
+	opENDF      = 0x2d // END Function definition
+	opMDAP0     = 0x2e // Move Direct Absolute Point
+	opMDAP1     = 0x2f // .
+	opIUP0      = 0x30 // Interpolate Untouched Points through the outline
+	opIUP1      = 0x31 // .
+	opSHP0      = 0x32 // SHift Point using reference point
+	opSHP1      = 0x33 // .
+	opSHC0      = 0x34 // SHift Contour using reference point
+	opSHC1      = 0x35 // .
+	opSHZ0      = 0x36 // SHift Zone using reference point
+	opSHZ1      = 0x37 // .
+	opSHPIX     = 0x38 // SHift point by a PIXel amount
+	opIP        = 0x39 // Interpolate Point
+	opMSIRP0    = 0x3a // Move Stack Indirect Relative Point
+	opMSIRP1    = 0x3b // .
+	opALIGNRP   = 0x3c // ALIGN to Reference Point
+	opRTDG      = 0x3d // Round To Double Grid
+	opMIAP0     = 0x3e // Move Indirect Absolute Point
+	opMIAP1     = 0x3f // .
+	opNPUSHB    = 0x40 // PUSH N Bytes
+	opNPUSHW    = 0x41 // PUSH N Words
+	opWS        = 0x42 // Write Store
+	opRS        = 0x43 // Read Store
+	opWCVTP     = 0x44 // Write Control Value Table in Pixel units
+	opRCVT      = 0x45 // Read Control Value Table entry
+	opGC0       = 0x46 // Get Coordinate projected onto the projection vector
+	opGC1       = 0x47 // .
+	opSCFS      = 0x48 // Sets Coordinate From the Stack using projection vector and freedom vector
+	opMD0       = 0x49 // Measure Distance
+	opMD1       = 0x4a // .
+	opMPPEM     = 0x4b // Measure Pixels Per EM
+	opMPS       = 0x4c // Measure Point Size
+	opFLIPON    = 0x4d // set the auto FLIP Boolean to ON
+	opFLIPOFF   = 0x4e // set the auto FLIP Boolean to OFF
+	opDEBUG     = 0x4f // DEBUG call
+	opLT        = 0x50 // Less Than
+	opLTEQ      = 0x51 // Less Than or EQual
+	opGT        = 0x52 // Greater Than
+	opGTEQ      = 0x53 // Greater Than or EQual
+	opEQ        = 0x54 // EQual
+	opNEQ       = 0x55 // Not EQual
+	opODD       = 0x56 // ODD
+	opEVEN      = 0x57 // EVEN
+	opIF        = 0x58 // IF test
+	opEIF       = 0x59 // End IF
+	opAND       = 0x5a // logical AND
+	opOR        = 0x5b // logical OR
+	opNOT       = 0x5c // logical NOT
+	opDELTAP1   = 0x5d // DELTA exception P1
+	opSDB       = 0x5e // Set Delta Base in the graphics state
+	opSDS       = 0x5f // Set Delta Shift in the graphics state
+	opADD       = 0x60 // ADD
+	opSUB       = 0x61 // SUBtract
+	opDIV       = 0x62 // DIVide
+	opMUL       = 0x63 // MULtiply
+	opABS       = 0x64 // ABSolute value
+	opNEG       = 0x65 // NEGate
+	opFLOOR     = 0x66 // FLOOR
+	opCEILING   = 0x67 // CEILING
+	opROUND00   = 0x68 // ROUND value
+	opROUND01   = 0x69 // .
+	opROUND10   = 0x6a // .
+	opROUND11   = 0x6b // .
+	opNROUND00  = 0x6c // No ROUNDing of value
+	opNROUND01  = 0x6d // .
+	opNROUND10  = 0x6e // .
+	opNROUND11  = 0x6f // .
+	opWCVTF     = 0x70 // Write Control Value Table in Funits
+	opDELTAP2   = 0x71 // DELTA exception P2
+	opDELTAP3   = 0x72 // DELTA exception P3
+	opDELTAC1   = 0x73 // DELTA exception C1
+	opDELTAC2   = 0x74 // DELTA exception C2
+	opDELTAC3   = 0x75 // DELTA exception C3
+	opSROUND    = 0x76 // Super ROUND
+	opS45ROUND  = 0x77 // Super ROUND 45 degrees
+	opJROT      = 0x78 // Jump Relative On True
+	opJROF      = 0x79 // Jump Relative On False
+	opROFF      = 0x7a // Round OFF
+	op_0x7b     = 0x7b // deprecated
+	opRUTG      = 0x7c // Round Up To Grid
+	opRDTG      = 0x7d // Round Down To Grid
+	opSANGW     = 0x7e // Set ANGle Weight
+	opAA        = 0x7f // Adjust Angle
+	opFLIPPT    = 0x80 // FLIP PoinT
+	opFLIPRGON  = 0x81 // FLIP RanGe ON
+	opFLIPRGOFF = 0x82 // FLIP RanGe OFF
+	op_0x83     = 0x83 // deprecated
+	op_0x84     = 0x84 // deprecated
+	opSCANCTRL  = 0x85 // SCAN conversion ConTRoL
+	opSDPVTL0   = 0x86 // Set Dual Projection Vector To Line
+	opSDPVTL1   = 0x87 // .
+	opGETINFO   = 0x88 // GET INFOrmation
+	opIDEF      = 0x89 // Instruction DEFinition
+	opROLL      = 0x8a // ROLL the top three stack elements
+	opMAX       = 0x8b // MAXimum of top two stack elements
+	opMIN       = 0x8c // MINimum of top two stack elements
+	opSCANTYPE  = 0x8d // SCANTYPE
+	opINSTCTRL  = 0x8e // INSTRuction execution ConTRoL
+	op_0x8f     = 0x8f
+	op_0x90     = 0x90
+	op_0x91     = 0x91
+	op_0x92     = 0x92
+	op_0x93     = 0x93
+	op_0x94     = 0x94
+	op_0x95     = 0x95
+	op_0x96     = 0x96
+	op_0x97     = 0x97
+	op_0x98     = 0x98
+	op_0x99     = 0x99
+	op_0x9a     = 0x9a
+	op_0x9b     = 0x9b
+	op_0x9c     = 0x9c
+	op_0x9d     = 0x9d
+	op_0x9e     = 0x9e
+	op_0x9f     = 0x9f
+	op_0xa0     = 0xa0
+	op_0xa1     = 0xa1
+	op_0xa2     = 0xa2
+	op_0xa3     = 0xa3
+	op_0xa4     = 0xa4
+	op_0xa5     = 0xa5
+	op_0xa6     = 0xa6
+	op_0xa7     = 0xa7
+	op_0xa8     = 0xa8
+	op_0xa9     = 0xa9
+	op_0xaa     = 0xaa
+	op_0xab     = 0xab
+	op_0xac     = 0xac
+	op_0xad     = 0xad
+	op_0xae     = 0xae
+	op_0xaf     = 0xaf
+	opPUSHB000  = 0xb0 // PUSH Bytes
+	opPUSHB001  = 0xb1 // .
+	opPUSHB010  = 0xb2 // .
+	opPUSHB011  = 0xb3 // .
+	opPUSHB100  = 0xb4 // .
+	opPUSHB101  = 0xb5 // .
+	opPUSHB110  = 0xb6 // .
+	opPUSHB111  = 0xb7 // .
+	opPUSHW000  = 0xb8 // PUSH Words
+	opPUSHW001  = 0xb9 // .
+	opPUSHW010  = 0xba // .
+	opPUSHW011  = 0xbb // .
+	opPUSHW100  = 0xbc // .
+	opPUSHW101  = 0xbd // .
+	opPUSHW110  = 0xbe // .
+	opPUSHW111  = 0xbf // .
+	opMDRP00000 = 0xc0 // Move Direct Relative Point
+	opMDRP00001 = 0xc1 // .
+	opMDRP00010 = 0xc2 // .
+	opMDRP00011 = 0xc3 // .
+	opMDRP00100 = 0xc4 // .
+	opMDRP00101 = 0xc5 // .
+	opMDRP00110 = 0xc6 // .
+	opMDRP00111 = 0xc7 // .
+	opMDRP01000 = 0xc8 // .
+	opMDRP01001 = 0xc9 // .
+	opMDRP01010 = 0xca // .
+	opMDRP01011 = 0xcb // .
+	opMDRP01100 = 0xcc // .
+	opMDRP01101 = 0xcd // .
+	opMDRP01110 = 0xce // .
+	opMDRP01111 = 0xcf // .
+	opMDRP10000 = 0xd0 // .
+	opMDRP10001 = 0xd1 // .
+	opMDRP10010 = 0xd2 // .
+	opMDRP10011 = 0xd3 // .
+	opMDRP10100 = 0xd4 // .
+	opMDRP10101 = 0xd5 // .
+	opMDRP10110 = 0xd6 // .
+	opMDRP10111 = 0xd7 // .
+	opMDRP11000 = 0xd8 // .
+	opMDRP11001 = 0xd9 // .
+	opMDRP11010 = 0xda // .
+	opMDRP11011 = 0xdb // .
+	opMDRP11100 = 0xdc // .
+	opMDRP11101 = 0xdd // .
+	opMDRP11110 = 0xde // .
+	opMDRP11111 = 0xdf // .
+	opMIRP00000 = 0xe0 // Move Indirect Relative Point
+	opMIRP00001 = 0xe1 // .
+	opMIRP00010 = 0xe2 // .
+	opMIRP00011 = 0xe3 // .
+	opMIRP00100 = 0xe4 // .
+	opMIRP00101 = 0xe5 // .
+	opMIRP00110 = 0xe6 // .
+	opMIRP00111 = 0xe7 // .
+	opMIRP01000 = 0xe8 // .
+	opMIRP01001 = 0xe9 // .
+	opMIRP01010 = 0xea // .
+	opMIRP01011 = 0xeb // .
+	opMIRP01100 = 0xec // .
+	opMIRP01101 = 0xed // .
+	opMIRP01110 = 0xee // .
+	opMIRP01111 = 0xef // .
+	opMIRP10000 = 0xf0 // .
+	opMIRP10001 = 0xf1 // .
+	opMIRP10010 = 0xf2 // .
+	opMIRP10011 = 0xf3 // .
+	opMIRP10100 = 0xf4 // .
+	opMIRP10101 = 0xf5 // .
+	opMIRP10110 = 0xf6 // .
+	opMIRP10111 = 0xf7 // .
+	opMIRP11000 = 0xf8 // .
+	opMIRP11001 = 0xf9 // .
+	opMIRP11010 = 0xfa // .
+	opMIRP11011 = 0xfb // .
+	opMIRP11100 = 0xfc // .
+	opMIRP11101 = 0xfd // .
+	opMIRP11110 = 0xfe // .
+	opMIRP11111 = 0xff // .
+)
+
+// popCount is the number of stack elements that each opcode pops.
+var popCount = [256]uint8{
+	// 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f
+	0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 0, 0, 0, 5, // 0x00 - 0x0f
+	1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, // 0x10 - 0x1f
+	1, 1, 0, 2, 0, 1, 1, 2, 0, 1, 2, 1, 1, 0, 1, 1, // 0x20 - 0x2f
+	0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 2, 2, 0, 0, 2, 2, // 0x30 - 0x3f
+	0, 0, 2, 1, 2, 1, 1, 1, 2, 2, 2, 0, 0, 0, 0, 0, // 0x40 - 0x4f
+	2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 2, 2, 1, 1, 1, 1, // 0x50 - 0x5f
+	2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x60 - 0x6f
+	2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 0, 0, 0, 0, 1, 1, // 0x70 - 0x7f
+	0, 2, 2, 0, 0, 1, 2, 2, 1, 1, 3, 2, 2, 1, 2, 0, // 0x80 - 0x8f
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x90 - 0x9f
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xa0 - 0xaf
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0xb0 - 0xbf
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xc0 - 0xcf
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xd0 - 0xdf
+	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xe0 - 0xef
+	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 0xf0 - 0xff
+}
diff --git a/server/vendor/github.com/golang/freetype/truetype/truetype.go b/server/vendor/github.com/golang/freetype/truetype/truetype.go
new file mode 100644
index 000000000..7270bbf22
--- /dev/null
+++ b/server/vendor/github.com/golang/freetype/truetype/truetype.go
@@ -0,0 +1,653 @@
+// Copyright 2010 The Freetype-Go Authors. All rights reserved.
+// Use of this source code is governed by your choice of either the
+// FreeType License or the GNU General Public License version 2 (or
+// any later version), both of which can be found in the LICENSE file.
+
+// Package truetype provides a parser for the TTF and TTC file formats.
+// Those formats are documented at http://developer.apple.com/fonts/TTRefMan/
+// and http://www.microsoft.com/typography/otspec/
+//
+// Some of a font's methods provide lengths or co-ordinates, e.g. bounds, font
+// metrics and control points. All these methods take a scale parameter, which
+// is the number of pixels in 1 em, expressed as a 26.6 fixed point value. For
+// example, if 1 em is 10 pixels then scale is fixed.I(10), which is equal to
+// fixed.Int26_6(10 << 6).
+//
+// To measure a TrueType font in ideal FUnit space, use scale equal to
+// font.FUnitsPerEm().
+package truetype // import "github.com/golang/freetype/truetype"
+
+import (
+	"fmt"
+
+	"golang.org/x/image/math/fixed"
+)
+
+// An Index is a Font's index of a rune.
+type Index uint16
+
+// A NameID identifies a name table entry.
+//
+// See https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6name.html
+type NameID uint16
+
+const (
+	NameIDCopyright          NameID = 0
+	NameIDFontFamily                = 1
+	NameIDFontSubfamily             = 2
+	NameIDUniqueSubfamilyID         = 3
+	NameIDFontFullName              = 4
+	NameIDNameTableVersion          = 5
+	NameIDPostscriptName            = 6
+	NameIDTrademarkNotice           = 7
+	NameIDManufacturerName          = 8
+	NameIDDesignerName              = 9
+	NameIDFontDescription           = 10
+	NameIDFontVendorURL             = 11
+	NameIDFontDesignerURL           = 12
+	NameIDFontLicense               = 13
+	NameIDFontLicenseURL            = 14
+	NameIDPreferredFamily           = 16
+	NameIDPreferredSubfamily        = 17
+	NameIDCompatibleName            = 18
+	NameIDSampleText                = 19
+)
+
+const (
+	// A 32-bit encoding consists of a most-significant 16-bit Platform ID and a
+	// least-significant 16-bit Platform Specific ID. The magic numbers are
+	// specified at https://www.microsoft.com/typography/otspec/name.htm
+	unicodeEncodingBMPOnly  = 0x00000003 // PID = 0 (Unicode), PSID = 3 (Unicode 2.0 BMP Only)
+	unicodeEncodingFull     = 0x00000004 // PID = 0 (Unicode), PSID = 4 (Unicode 2.0 Full Repertoire)
+	microsoftSymbolEncoding = 0x00030000 // PID = 3 (Microsoft), PSID = 0 (Symbol)
+	microsoftUCS2Encoding   = 0x00030001 // PID = 3 (Microsoft), PSID = 1 (UCS-2)
+	microsoftUCS4Encoding   = 0x0003000a // PID = 3 (Microsoft), PSID = 10 (UCS-4)
+)
+
+// An HMetric holds the horizontal metrics of a single glyph.
+type HMetric struct {
+	AdvanceWidth, LeftSideBearing fixed.Int26_6
+}
+
+// A VMetric holds the vertical metrics of a single glyph.
+type VMetric struct {
+	AdvanceHeight, TopSideBearing fixed.Int26_6
+}
+
+// A FormatError reports that the input is not a valid TrueType font.
+type FormatError string
+
+func (e FormatError) Error() string {
+	return "freetype: invalid TrueType format: " + string(e)
+}
+
+// An UnsupportedError reports that the input uses a valid but unimplemented
+// TrueType feature.
+type UnsupportedError string
+
+func (e UnsupportedError) Error() string {
+	return "freetype: unsupported TrueType feature: " + string(e)
+}
+
+// u32 returns the big-endian uint32 at b[i:].
+func u32(b []byte, i int) uint32 {
+	return uint32(b[i])<<24 | uint32(b[i+1])<<16 | uint32(b[i+2])<<8 | uint32(b[i+3])
+}
+
+// u16 returns the big-endian uint16 at b[i:].
+func u16(b []byte, i int) uint16 {
+	return uint16(b[i])<<8 | uint16(b[i+1])
+}
+
+// readTable returns a slice of the TTF data given by a table's directory entry.
+func readTable(ttf []byte, offsetLength []byte) ([]byte, error) {
+	offset := int(u32(offsetLength, 0))
+	if offset < 0 {
+		return nil, FormatError(fmt.Sprintf("offset too large: %d", uint32(offset)))
+	}
+	length := int(u32(offsetLength, 4))
+	if length < 0 {
+		return nil, FormatError(fmt.Sprintf("length too large: %d", uint32(length)))
+	}
+	end := offset + length
+	if end < 0 || end > len(ttf) {
+		return nil, FormatError(fmt.Sprintf("offset + length too large: %d", uint32(offset)+uint32(length)))
+	}
+	return ttf[offset:end], nil
+}
+
+// parseSubtables returns the offset and platformID of the best subtable in
+// table, where best favors a Unicode cmap encoding, and failing that, a
+// Microsoft cmap encoding. offset is the offset of the first subtable in
+// table, and size is the size of each subtable.
+//
+// If pred is non-nil, then only subtables that satisfy that predicate will be
+// considered.
+func parseSubtables(table []byte, name string, offset, size int, pred func([]byte) bool) (
+	bestOffset int, bestPID uint32, retErr error) {
+
+	if len(table) < 4 {
+		return 0, 0, FormatError(name + " too short")
+	}
+	nSubtables := int(u16(table, 2))
+	if len(table) < size*nSubtables+offset {
+		return 0, 0, FormatError(name + " too short")
+	}
+	ok := false
+	for i := 0; i < nSubtables; i, offset = i+1, offset+size {
+		if pred != nil && !pred(table[offset:]) {
+			continue
+		}
+		// We read the 16-bit Platform ID and 16-bit Platform Specific ID as a single uint32.
+		// All values are big-endian.
+		pidPsid := u32(table, offset)
+		// We prefer the Unicode cmap encoding. Failing to find that, we fall
+		// back onto the Microsoft cmap encoding.
+		if pidPsid == unicodeEncodingBMPOnly || pidPsid == unicodeEncodingFull {
+			bestOffset, bestPID, ok = offset, pidPsid>>16, true
+			break
+
+		} else if pidPsid == microsoftSymbolEncoding ||
+			pidPsid == microsoftUCS2Encoding ||
+			pidPsid == microsoftUCS4Encoding {
+
+			bestOffset, bestPID, ok = offset, pidPsid>>16, true
+			// We don't break out of the for loop, so that Unicode can override Microsoft.
+		}
+	}
+	if !ok {
+		return 0, 0, UnsupportedError(name + " encoding")
+	}
+	return bestOffset, bestPID, nil
+}
+
+const (
+	locaOffsetFormatUnknown int = iota
+	locaOffsetFormatShort
+	locaOffsetFormatLong
+)
+
+// A cm holds a parsed cmap entry.
+type cm struct {
+	start, end, delta, offset uint32
+}
+
+// A Font represents a Truetype font.
+type Font struct {
+	// Tables sliced from the TTF data. The different tables are documented
+	// at http://developer.apple.com/fonts/TTRefMan/RM06/Chap6.html
+	cmap, cvt, fpgm, glyf, hdmx, head, hhea, hmtx, kern, loca, maxp, name, os2, prep, vmtx []byte
+
+	cmapIndexes []byte
+
+	// Cached values derived from the raw ttf data.
+	cm                      []cm
+	locaOffsetFormat        int
+	nGlyph, nHMetric, nKern int
+	fUnitsPerEm             int32
+	ascent                  int32               // In FUnits.
+	descent                 int32               // In FUnits; typically negative.
+	bounds                  fixed.Rectangle26_6 // In FUnits.
+	// Values from the maxp section.
+	maxTwilightPoints, maxStorage, maxFunctionDefs, maxStackElements uint16
+}
+
+func (f *Font) parseCmap() error {
+	const (
+		cmapFormat4         = 4
+		cmapFormat12        = 12
+		languageIndependent = 0
+	)
+
+	offset, _, err := parseSubtables(f.cmap, "cmap", 4, 8, nil)
+	if err != nil {
+		return err
+	}
+	offset = int(u32(f.cmap, offset+4))
+	if offset <= 0 || offset > len(f.cmap) {
+		return FormatError("bad cmap offset")
+	}
+
+	cmapFormat := u16(f.cmap, offset)
+	switch cmapFormat {
+	case cmapFormat4:
+		language := u16(f.cmap, offset+4)
+		if language != languageIndependent {
+			return UnsupportedError(fmt.Sprintf("language: %d", language))
+		}
+		segCountX2 := int(u16(f.cmap, offset+6))
+		if segCountX2%2 == 1 {
+			return FormatError(fmt.Sprintf("bad segCountX2: %d", segCountX2))
+		}
+		segCount := segCountX2 / 2
+		offset += 14
+		f.cm = make([]cm, segCount)
+		for i := 0; i < segCount; i++ {
+			f.cm[i].end = uint32(u16(f.cmap, offset))
+			offset += 2
+		}
+		offset += 2
+		for i := 0; i < segCount; i++ {
+			f.cm[i].start = uint32(u16(f.cmap, offset))
+			offset += 2
+		}
+		for i := 0; i < segCount; i++ {
+			f.cm[i].delta = uint32(u16(f.cmap, offset))
+			offset += 2
+		}
+		for i := 0; i < segCount; i++ {
+			f.cm[i].offset = uint32(u16(f.cmap, offset))
+			offset += 2
+		}
+		f.cmapIndexes = f.cmap[offset:]
+		return nil
+
+	case cmapFormat12:
+		if u16(f.cmap, offset+2) != 0 {
+			return FormatError(fmt.Sprintf("cmap format: % x", f.cmap[offset:offset+4]))
+		}
+		length := u32(f.cmap, offset+4)
+		language := u32(f.cmap, offset+8)
+		if language != languageIndependent {
+			return UnsupportedError(fmt.Sprintf("language: %d", language))
+		}
+		nGroups := u32(f.cmap, offset+12)
+		if length != 12*nGroups+16 {
+			return FormatError("inconsistent cmap length")
+		}
+		offset += 16
+		f.cm = make([]cm, nGroups)
+		for i := uint32(0); i < nGroups; i++ {
+			f.cm[i].start = u32(f.cmap, offset+0)
+			f.cm[i].end = u32(f.cmap, offset+4)
+			f.cm[i].delta = u32(f.cmap, offset+8) - f.cm[i].start
+			offset += 12
+		}
+		return nil
+	}
+	return UnsupportedError(fmt.Sprintf("cmap format: %d", cmapFormat))
+}
+
+func (f *Font) parseHead() error {
+	if len(f.head) != 54 {
+		return FormatError(fmt.Sprintf("bad head length: %d", len(f.head)))
+	}
+	f.fUnitsPerEm = int32(u16(f.head, 18))
+	f.bounds.Min.X = fixed.Int26_6(int16(u16(f.head, 36)))
+	f.bounds.Min.Y = fixed.Int26_6(int16(u16(f.head, 38)))
+	f.bounds.Max.X = fixed.Int26_6(int16(u16(f.head, 40)))
+	f.bounds.Max.Y = fixed.Int26_6(int16(u16(f.head, 42)))
+	switch i := u16(f.head, 50); i {
+	case 0:
+		f.locaOffsetFormat = locaOffsetFormatShort
+	case 1:
+		f.locaOffsetFormat = locaOffsetFormatLong
+	default:
+		return FormatError(fmt.Sprintf("bad indexToLocFormat: %d", i))
+	}
+	return nil
+}
+
+func (f *Font) parseHhea() error {
+	if len(f.hhea) != 36 {
+		return FormatError(fmt.Sprintf("bad hhea length: %d", len(f.hhea)))
+	}
+	f.ascent = int32(int16(u16(f.hhea, 4)))
+	f.descent = int32(int16(u16(f.hhea, 6)))
+	f.nHMetric = int(u16(f.hhea, 34))
+	if 4*f.nHMetric+2*(f.nGlyph-f.nHMetric) != len(f.hmtx) {
+		return FormatError(fmt.Sprintf("bad hmtx length: %d", len(f.hmtx)))
+	}
+	return nil
+}
+
+func (f *Font) parseKern() error {
+	// Apple's TrueType documentation (http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html) says:
+	// "Previous versions of the 'kern' table defined both the version and nTables fields in the header
+	// as UInt16 values and not UInt32 values. Use of the older format on the Mac OS is discouraged
+	// (although AAT can sense an old kerning table and still make correct use of it). Microsoft
+	// Windows still uses the older format for the 'kern' table and will not recognize the newer one.
+	// Fonts targeted for the Mac OS only should use the new format; fonts targeted for both the Mac OS
+	// and Windows should use the old format."
+	// Since we expect that almost all fonts aim to be Windows-compatible, we only parse the "older" format,
+	// just like the C Freetype implementation.
+	if len(f.kern) == 0 {
+		if f.nKern != 0 {
+			return FormatError("bad kern table length")
+		}
+		return nil
+	}
+	if len(f.kern) < 18 {
+		return FormatError("kern data too short")
+	}
+	version, offset := u16(f.kern, 0), 2
+	if version != 0 {
+		return UnsupportedError(fmt.Sprintf("kern version: %d", version))
+	}
+
+	n, offset := u16(f.kern, offset), offset+2
+	if n == 0 {
+		return UnsupportedError("kern nTables: 0")
+	}
+	// TODO: support multiple subtables. In practice, almost all .ttf files
+	// have only one subtable, if they have a kern table at all. But it's not
+	// impossible. Xolonium Regular (https://fontlibrary.org/en/font/xolonium)
+	// has 3 subtables. Those subtables appear to be disjoint, rather than
+	// being the same kerning pairs encoded in three different ways.
+	//
+	// For now, we'll use only the first subtable.
+
+	offset += 2 // Skip the version.
+	length, offset := int(u16(f.kern, offset)), offset+2
+	coverage, offset := u16(f.kern, offset), offset+2
+	if coverage != 0x0001 {
+		// We only support horizontal kerning.
+		return UnsupportedError(fmt.Sprintf("kern coverage: 0x%04x", coverage))
+	}
+	f.nKern, offset = int(u16(f.kern, offset)), offset+2
+	if 6*f.nKern != length-14 {
+		return FormatError("bad kern table length")
+	}
+	return nil
+}
+
+func (f *Font) parseMaxp() error {
+	if len(f.maxp) != 32 {
+		return FormatError(fmt.Sprintf("bad maxp length: %d", len(f.maxp)))
+	}
+	f.nGlyph = int(u16(f.maxp, 4))
+	f.maxTwilightPoints = u16(f.maxp, 16)
+	f.maxStorage = u16(f.maxp, 18)
+	f.maxFunctionDefs = u16(f.maxp, 20)
+	f.maxStackElements = u16(f.maxp, 24)
+	return nil
+}
+
+// scale returns x divided by f.fUnitsPerEm, rounded to the nearest integer.
+func (f *Font) scale(x fixed.Int26_6) fixed.Int26_6 {
+	if x >= 0 {
+		x += fixed.Int26_6(f.fUnitsPerEm) / 2
+	} else {
+		x -= fixed.Int26_6(f.fUnitsPerEm) / 2
+	}
+	return x / fixed.Int26_6(f.fUnitsPerEm)
+}
+
+// Bounds returns the union of a Font's glyphs' bounds.
+func (f *Font) Bounds(scale fixed.Int26_6) fixed.Rectangle26_6 {
+	b := f.bounds
+	b.Min.X = f.scale(scale * b.Min.X)
+	b.Min.Y = f.scale(scale * b.Min.Y)
+	b.Max.X = f.scale(scale * b.Max.X)
+	b.Max.Y = f.scale(scale * b.Max.Y)
+	return b
+}
+
+// FUnitsPerEm returns the number of FUnits in a Font's em-square's side.
+func (f *Font) FUnitsPerEm() int32 {
+	return f.fUnitsPerEm
+}
+
+// Index returns a Font's index for the given rune.
+func (f *Font) Index(x rune) Index {
+	c := uint32(x)
+	for i, j := 0, len(f.cm); i < j; {
+		h := i + (j-i)/2
+		cm := &f.cm[h]
+		if c < cm.start {
+			j = h
+		} else if cm.end < c {
+			i = h + 1
+		} else if cm.offset == 0 {
+			return Index(c + cm.delta)
+		} else {
+			offset := int(cm.offset) + 2*(h-len(f.cm)+int(c-cm.start))
+			return Index(u16(f.cmapIndexes, offset))
+		}
+	}
+	return 0
+}
+
+// Name returns the Font's name value for the given NameID. It returns "" if
+// there was an error, or if that name was not found.
+func (f *Font) Name(id NameID) string {
+	x, platformID, err := parseSubtables(f.name, "name", 6, 12, func(b []byte) bool {
+		return NameID(u16(b, 6)) == id
+	})
+	if err != nil {
+		return ""
+	}
+	offset, length := u16(f.name, 4)+u16(f.name, x+10), u16(f.name, x+8)
+	// Return the ASCII value of the encoded string.
+	// The string is encoded as UTF-16 on non-Apple platformIDs; Apple is platformID 1.
+	src := f.name[offset : offset+length]
+	var dst []byte
+	if platformID != 1 { // UTF-16.
+		if len(src)&1 != 0 {
+			return ""
+		}
+		dst = make([]byte, len(src)/2)
+		for i := range dst {
+			dst[i] = printable(u16(src, 2*i))
+		}
+	} else { // ASCII.
+		dst = make([]byte, len(src))
+		for i, c := range src {
+			dst[i] = printable(uint16(c))
+		}
+	}
+	return string(dst)
+}
+
+func printable(r uint16) byte {
+	if 0x20 <= r && r < 0x7f {
+		return byte(r)
+	}
+	return '?'
+}
+
+// unscaledHMetric returns the unscaled horizontal metrics for the glyph with
+// the given index.
+func (f *Font) unscaledHMetric(i Index) (h HMetric) {
+	j := int(i)
+	if j < 0 || f.nGlyph <= j {
+		return HMetric{}
+	}
+	if j >= f.nHMetric {
+		p := 4 * (f.nHMetric - 1)
+		return HMetric{
+			AdvanceWidth:    fixed.Int26_6(u16(f.hmtx, p)),
+			LeftSideBearing: fixed.Int26_6(int16(u16(f.hmtx, p+2*(j-f.nHMetric)+4))),
+		}
+	}
+	return HMetric{
+		AdvanceWidth:    fixed.Int26_6(u16(f.hmtx, 4*j)),
+		LeftSideBearing: fixed.Int26_6(int16(u16(f.hmtx, 4*j+2))),
+	}
+}
+
+// HMetric returns the horizontal metrics for the glyph with the given index.
+func (f *Font) HMetric(scale fixed.Int26_6, i Index) HMetric {
+	h := f.unscaledHMetric(i)
+	h.AdvanceWidth = f.scale(scale * h.AdvanceWidth)
+	h.LeftSideBearing = f.scale(scale * h.LeftSideBearing)
+	return h
+}
+
+// unscaledVMetric returns the unscaled vertical metrics for the glyph with
+// the given index. yMax is the top of the glyph's bounding box.
+func (f *Font) unscaledVMetric(i Index, yMax fixed.Int26_6) (v VMetric) {
+	j := int(i)
+	if j < 0 || f.nGlyph <= j {
+		return VMetric{}
+	}
+	if 4*j+4 <= len(f.vmtx) {
+		return VMetric{
+			AdvanceHeight:  fixed.Int26_6(u16(f.vmtx, 4*j)),
+			TopSideBearing: fixed.Int26_6(int16(u16(f.vmtx, 4*j+2))),
+		}
+	}
+	// The OS/2 table has grown over time.
+	// https://developer.apple.com/fonts/TTRefMan/RM06/Chap6OS2.html
+	// says that it was originally 68 bytes. Optional fields, including
+	// the ascender and descender, are described at
+	// http://www.microsoft.com/typography/otspec/os2.htm
+	if len(f.os2) >= 72 {
+		sTypoAscender := fixed.Int26_6(int16(u16(f.os2, 68)))
+		sTypoDescender := fixed.Int26_6(int16(u16(f.os2, 70)))
+		return VMetric{
+			AdvanceHeight:  sTypoAscender - sTypoDescender,
+			TopSideBearing: sTypoAscender - yMax,
+		}
+	}
+	return VMetric{
+		AdvanceHeight:  fixed.Int26_6(f.fUnitsPerEm),
+		TopSideBearing: 0,
+	}
+}
+
+// VMetric returns the vertical metrics for the glyph with the given index.
+func (f *Font) VMetric(scale fixed.Int26_6, i Index) VMetric {
+	// TODO: should 0 be bounds.YMax?
+	v := f.unscaledVMetric(i, 0)
+	v.AdvanceHeight = f.scale(scale * v.AdvanceHeight)
+	v.TopSideBearing = f.scale(scale * v.TopSideBearing)
+	return v
+}
+
+// Kern returns the horizontal adjustment for the given glyph pair. A positive
+// kern means to move the glyphs further apart.
+func (f *Font) Kern(scale fixed.Int26_6, i0, i1 Index) fixed.Int26_6 {
+	if f.nKern == 0 {
+		return 0
+	}
+	g := uint32(i0)<<16 | uint32(i1)
+	lo, hi := 0, f.nKern
+	for lo < hi {
+		i := (lo + hi) / 2
+		ig := u32(f.kern, 18+6*i)
+		if ig < g {
+			lo = i + 1
+		} else if ig > g {
+			hi = i
+		} else {
+			return f.scale(scale * fixed.Int26_6(int16(u16(f.kern, 22+6*i))))
+		}
+	}
+	return 0
+}
+
+// Parse returns a new Font for the given TTF or TTC data.
+//
+// For TrueType Collections, the first font in the collection is parsed.
+func Parse(ttf []byte) (font *Font, err error) {
+	return parse(ttf, 0)
+}
+
+func parse(ttf []byte, offset int) (font *Font, err error) {
+	if len(ttf)-offset < 12 {
+		err = FormatError("TTF data is too short")
+		return
+	}
+	originalOffset := offset
+	magic, offset := u32(ttf, offset), offset+4
+	switch magic {
+	case 0x00010000:
+		// No-op.
+	case 0x74746366: // "ttcf" as a big-endian uint32.
+		if originalOffset != 0 {
+			err = FormatError("recursive TTC")
+			return
+		}
+		ttcVersion, offset := u32(ttf, offset), offset+4
+		if ttcVersion != 0x00010000 && ttcVersion != 0x00020000 {
+			err = FormatError("bad TTC version")
+			return
+		}
+		numFonts, offset := int(u32(ttf, offset)), offset+4
+		if numFonts <= 0 {
+			err = FormatError("bad number of TTC fonts")
+			return
+		}
+		if len(ttf[offset:])/4 < numFonts {
+			err = FormatError("TTC offset table is too short")
+			return
+		}
+		// TODO: provide an API to select which font in a TrueType collection to return,
+		// not just the first one. This may require an API to parse a TTC's name tables,
+		// so users of this package can select the font in a TTC by name.
+		offset = int(u32(ttf, offset))
+		if offset <= 0 || offset > len(ttf) {
+			err = FormatError("bad TTC offset")
+			return
+		}
+		return parse(ttf, offset)
+	default:
+		err = FormatError("bad TTF version")
+		return
+	}
+	n, offset := int(u16(ttf, offset)), offset+2
+	offset += 6 // Skip the searchRange, entrySelector and rangeShift.
+	if len(ttf) < 16*n+offset {
+		err = FormatError("TTF data is too short")
+		return
+	}
+	f := new(Font)
+	// Assign the table slices.
+	for i := 0; i < n; i++ {
+		x := 16*i + offset
+		switch string(ttf[x : x+4]) {
+		case "cmap":
+			f.cmap, err = readTable(ttf, ttf[x+8:x+16])
+		case "cvt ":
+			f.cvt, err = readTable(ttf, ttf[x+8:x+16])
+		case "fpgm":
+			f.fpgm, err = readTable(ttf, ttf[x+8:x+16])
+		case "glyf":
+			f.glyf, err = readTable(ttf, ttf[x+8:x+16])
+		case "hdmx":
+			f.hdmx, err = readTable(ttf, ttf[x+8:x+16])
+		case "head":
+			f.head, err = readTable(ttf, ttf[x+8:x+16])
+		case "hhea":
+			f.hhea, err = readTable(ttf, ttf[x+8:x+16])
+		case "hmtx":
+			f.hmtx, err = readTable(ttf, ttf[x+8:x+16])
+		case "kern":
+			f.kern, err = readTable(ttf, ttf[x+8:x+16])
+		case "loca":
+			f.loca, err = readTable(ttf, ttf[x+8:x+16])
+		case "maxp":
+			f.maxp, err = readTable(ttf, ttf[x+8:x+16])
+		case "name":
+			f.name, err = readTable(ttf, ttf[x+8:x+16])
+		case "OS/2":
+			f.os2, err = readTable(ttf, ttf[x+8:x+16])
+		case "prep":
+			f.prep, err = readTable(ttf, ttf[x+8:x+16])
+		case "vmtx":
+			f.vmtx, err = readTable(ttf, ttf[x+8:x+16])
+		}
+		if err != nil {
+			return
+		}
+	}
+	// Parse and sanity-check the TTF data.
+	if err = f.parseHead(); err != nil {
+		return
+	}
+	if err = f.parseMaxp(); err != nil {
+		return
+	}
+	if err = f.parseCmap(); err != nil {
+		return
+	}
+	if err = f.parseKern(); err != nil {
+		return
+	}
+	if err = f.parseHhea(); err != nil {
+		return
+	}
+	font = f
+	return
+}
diff --git a/server/vendor/golang.org/x/image/draw/draw.go b/server/vendor/golang.org/x/image/draw/draw.go
new file mode 100644
index 000000000..cd5aaba64
--- /dev/null
+++ b/server/vendor/golang.org/x/image/draw/draw.go
@@ -0,0 +1,61 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package draw provides image composition functions.
+//
+// See "The Go image/draw package" for an introduction to this package:
+// http://golang.org/doc/articles/image_draw.html
+//
+// This package is a superset of and a drop-in replacement for the image/draw
+// package in the standard library.
+package draw
+
+// This file just contains the API exported by the image/draw package in the
+// standard library. Other files in this package provide additional features.
+
+import (
+	"image"
+	"image/draw"
+)
+
+// Draw calls DrawMask with a nil mask.
+func Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point, op Op) {
+	draw.Draw(dst, r, src, sp, draw.Op(op))
+}
+
+// DrawMask aligns r.Min in dst with sp in src and mp in mask and then
+// replaces the rectangle r in dst with the result of a Porter-Duff
+// composition. A nil mask is treated as opaque.
+func DrawMask(dst Image, r image.Rectangle, src image.Image, sp image.Point, mask image.Image, mp image.Point, op Op) {
+	draw.DrawMask(dst, r, src, sp, mask, mp, draw.Op(op))
+}
+
+// Drawer contains the Draw method.
+type Drawer = draw.Drawer
+
+// FloydSteinberg is a Drawer that is the Src Op with Floyd-Steinberg error
+// diffusion.
+var FloydSteinberg Drawer = floydSteinberg{}
+
+type floydSteinberg struct{}
+
+func (floydSteinberg) Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point) {
+	draw.FloydSteinberg.Draw(dst, r, src, sp)
+}
+
+// Image is an image.Image with a Set method to change a single pixel.
+type Image = draw.Image
+
+// Op is a Porter-Duff compositing operator.
+type Op = draw.Op
+
+const (
+	// Over specifies ``(src in mask) over dst''.
+	Over Op = draw.Over
+	// Src specifies ``src in mask''.
+	Src Op = draw.Src
+)
+
+// Quantizer produces a palette for an image.
+type Quantizer = draw.Quantizer
diff --git a/server/vendor/golang.org/x/image/draw/impl.go b/server/vendor/golang.org/x/image/draw/impl.go
new file mode 100644
index 000000000..75498adbd
--- /dev/null
+++ b/server/vendor/golang.org/x/image/draw/impl.go
@@ -0,0 +1,6670 @@
+// generated by "go run gen.go". DO NOT EDIT.
+
+package draw
+
+import (
+	"image"
+	"image/color"
+	"math"
+
+	"golang.org/x/image/math/f64"
+)
+
+func (z nnInterpolator) Scale(dst Image, dr image.Rectangle, src image.Image, sr image.Rectangle, op Op, opts *Options) {
+	// Try to simplify a Scale to a Copy when DstMask is not specified.
+	// If DstMask is not nil, Copy will call Scale back with same dr and sr, and cause stack overflow.
+	if dr.Size() == sr.Size() && (opts == nil || opts.DstMask == nil) {
+		Copy(dst, dr.Min, src, sr, op, opts)
+		return
+	}
+
+	var o Options
+	if opts != nil {
+		o = *opts
+	}
+
+	// adr is the affected destination pixels.
+	adr := dst.Bounds().Intersect(dr)
+	adr, o.DstMask = clipAffectedDestRect(adr, o.DstMask, o.DstMaskP)
+	if adr.Empty() || sr.Empty() {
+		return
+	}
+	// Make adr relative to dr.Min.
+	adr = adr.Sub(dr.Min)
+	if op == Over && o.SrcMask == nil && opaque(src) {
+		op = Src
+	}
+
+	// sr is the source pixels. If it extends beyond the src bounds,
+	// we cannot use the type-specific fast paths, as they access
+	// the Pix fields directly without bounds checking.
+	//
+	// Similarly, the fast paths assume that the masks are nil.
+	if o.DstMask != nil || o.SrcMask != nil || !sr.In(src.Bounds()) {
+		switch op {
+		case Over:
+			z.scale_Image_Image_Over(dst, dr, adr, src, sr, &o)
+		case Src:
+			z.scale_Image_Image_Src(dst, dr, adr, src, sr, &o)
+		}
+	} else if _, ok := src.(*image.Uniform); ok {
+		Draw(dst, dr, src, src.Bounds().Min, op)
+	} else {
+		switch op {
+		case Over:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				switch src := src.(type) {
+				case *image.NRGBA:
+					z.scale_RGBA_NRGBA_Over(dst, dr, adr, src, sr, &o)
+				case *image.RGBA:
+					z.scale_RGBA_RGBA_Over(dst, dr, adr, src, sr, &o)
+				default:
+					z.scale_RGBA_Image_Over(dst, dr, adr, src, sr, &o)
+				}
+			default:
+				switch src := src.(type) {
+				default:
+					z.scale_Image_Image_Over(dst, dr, adr, src, sr, &o)
+				}
+			}
+		case Src:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				switch src := src.(type) {
+				case *image.Gray:
+					z.scale_RGBA_Gray_Src(dst, dr, adr, src, sr, &o)
+				case *image.NRGBA:
+					z.scale_RGBA_NRGBA_Src(dst, dr, adr, src, sr, &o)
+				case *image.RGBA:
+					z.scale_RGBA_RGBA_Src(dst, dr, adr, src, sr, &o)
+				case *image.YCbCr:
+					switch src.SubsampleRatio {
+					default:
+						z.scale_RGBA_Image_Src(dst, dr, adr, src, sr, &o)
+					case image.YCbCrSubsampleRatio444:
+						z.scale_RGBA_YCbCr444_Src(dst, dr, adr, src, sr, &o)
+					case image.YCbCrSubsampleRatio422:
+						z.scale_RGBA_YCbCr422_Src(dst, dr, adr, src, sr, &o)
+					case image.YCbCrSubsampleRatio420:
+						z.scale_RGBA_YCbCr420_Src(dst, dr, adr, src, sr, &o)
+					case image.YCbCrSubsampleRatio440:
+						z.scale_RGBA_YCbCr440_Src(dst, dr, adr, src, sr, &o)
+					}
+				default:
+					z.scale_RGBA_Image_Src(dst, dr, adr, src, sr, &o)
+				}
+			default:
+				switch src := src.(type) {
+				default:
+					z.scale_Image_Image_Src(dst, dr, adr, src, sr, &o)
+				}
+			}
+		}
+	}
+}
+
+func (z nnInterpolator) Transform(dst Image, s2d f64.Aff3, src image.Image, sr image.Rectangle, op Op, opts *Options) {
+	// Try to simplify a Transform to a Copy.
+	if s2d[0] == 1 && s2d[1] == 0 && s2d[3] == 0 && s2d[4] == 1 {
+		dx := int(s2d[2])
+		dy := int(s2d[5])
+		if float64(dx) == s2d[2] && float64(dy) == s2d[5] {
+			Copy(dst, image.Point{X: sr.Min.X + dx, Y: sr.Min.X + dy}, src, sr, op, opts)
+			return
+		}
+	}
+
+	var o Options
+	if opts != nil {
+		o = *opts
+	}
+
+	dr := transformRect(&s2d, &sr)
+	// adr is the affected destination pixels.
+	adr := dst.Bounds().Intersect(dr)
+	adr, o.DstMask = clipAffectedDestRect(adr, o.DstMask, o.DstMaskP)
+	if adr.Empty() || sr.Empty() {
+		return
+	}
+	if op == Over && o.SrcMask == nil && opaque(src) {
+		op = Src
+	}
+
+	d2s := invert(&s2d)
+	// bias is a translation of the mapping from dst coordinates to src
+	// coordinates such that the latter temporarily have non-negative X
+	// and Y coordinates. This allows us to write int(f) instead of
+	// int(math.Floor(f)), since "round to zero" and "round down" are
+	// equivalent when f >= 0, but the former is much cheaper. The X--
+	// and Y-- are because the TransformLeaf methods have a "sx -= 0.5"
+	// adjustment.
+	bias := transformRect(&d2s, &adr).Min
+	bias.X--
+	bias.Y--
+	d2s[2] -= float64(bias.X)
+	d2s[5] -= float64(bias.Y)
+	// Make adr relative to dr.Min.
+	adr = adr.Sub(dr.Min)
+	// sr is the source pixels. If it extends beyond the src bounds,
+	// we cannot use the type-specific fast paths, as they access
+	// the Pix fields directly without bounds checking.
+	//
+	// Similarly, the fast paths assume that the masks are nil.
+	if o.DstMask != nil || o.SrcMask != nil || !sr.In(src.Bounds()) {
+		switch op {
+		case Over:
+			z.transform_Image_Image_Over(dst, dr, adr, &d2s, src, sr, bias, &o)
+		case Src:
+			z.transform_Image_Image_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+		}
+	} else if u, ok := src.(*image.Uniform); ok {
+		transform_Uniform(dst, dr, adr, &d2s, u, sr, bias, op)
+	} else {
+		switch op {
+		case Over:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				switch src := src.(type) {
+				case *image.NRGBA:
+					z.transform_RGBA_NRGBA_Over(dst, dr, adr, &d2s, src, sr, bias, &o)
+				case *image.RGBA:
+					z.transform_RGBA_RGBA_Over(dst, dr, adr, &d2s, src, sr, bias, &o)
+				default:
+					z.transform_RGBA_Image_Over(dst, dr, adr, &d2s, src, sr, bias, &o)
+				}
+			default:
+				switch src := src.(type) {
+				default:
+					z.transform_Image_Image_Over(dst, dr, adr, &d2s, src, sr, bias, &o)
+				}
+			}
+		case Src:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				switch src := src.(type) {
+				case *image.Gray:
+					z.transform_RGBA_Gray_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+				case *image.NRGBA:
+					z.transform_RGBA_NRGBA_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+				case *image.RGBA:
+					z.transform_RGBA_RGBA_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+				case *image.YCbCr:
+					switch src.SubsampleRatio {
+					default:
+						z.transform_RGBA_Image_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+					case image.YCbCrSubsampleRatio444:
+						z.transform_RGBA_YCbCr444_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+					case image.YCbCrSubsampleRatio422:
+						z.transform_RGBA_YCbCr422_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+					case image.YCbCrSubsampleRatio420:
+						z.transform_RGBA_YCbCr420_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+					case image.YCbCrSubsampleRatio440:
+						z.transform_RGBA_YCbCr440_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+					}
+				default:
+					z.transform_RGBA_Image_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+				}
+			default:
+				switch src := src.(type) {
+				default:
+					z.transform_Image_Image_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+				}
+			}
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_Gray_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.Gray, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pi := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.Stride + (sr.Min.X + int(sx) - src.Rect.Min.X)
+			pr := uint32(src.Pix[pi]) * 0x101
+			out := uint8(pr >> 8)
+			dst.Pix[d+0] = out
+			dst.Pix[d+1] = out
+			dst.Pix[d+2] = out
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_NRGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, src *image.NRGBA, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pi := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx)-src.Rect.Min.X)*4
+			pa := uint32(src.Pix[pi+3]) * 0x101
+			pr := uint32(src.Pix[pi+0]) * pa / 0xff
+			pg := uint32(src.Pix[pi+1]) * pa / 0xff
+			pb := uint32(src.Pix[pi+2]) * pa / 0xff
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_NRGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.NRGBA, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pi := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx)-src.Rect.Min.X)*4
+			pa := uint32(src.Pix[pi+3]) * 0x101
+			pr := uint32(src.Pix[pi+0]) * pa / 0xff
+			pg := uint32(src.Pix[pi+1]) * pa / 0xff
+			pb := uint32(src.Pix[pi+2]) * pa / 0xff
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_RGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, src *image.RGBA, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pi := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx)-src.Rect.Min.X)*4
+			pr := uint32(src.Pix[pi+0]) * 0x101
+			pg := uint32(src.Pix[pi+1]) * 0x101
+			pb := uint32(src.Pix[pi+2]) * 0x101
+			pa := uint32(src.Pix[pi+3]) * 0x101
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_RGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.RGBA, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pi := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx)-src.Rect.Min.X)*4
+			pr := uint32(src.Pix[pi+0]) * 0x101
+			pg := uint32(src.Pix[pi+1]) * 0x101
+			pb := uint32(src.Pix[pi+2]) * 0x101
+			pa := uint32(src.Pix[pi+3]) * 0x101
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_YCbCr444_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pi := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx) - src.Rect.Min.X)
+			pj := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.CStride + (sr.Min.X + int(sx) - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			pyy1 := int(src.Y[pi]) * 0x10101
+			pcb1 := int(src.Cb[pj]) - 128
+			pcr1 := int(src.Cr[pj]) - 128
+			pr := (pyy1 + 91881*pcr1) >> 8
+			pg := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+			pb := (pyy1 + 116130*pcb1) >> 8
+			if pr < 0 {
+				pr = 0
+			} else if pr > 0xffff {
+				pr = 0xffff
+			}
+			if pg < 0 {
+				pg = 0
+			} else if pg > 0xffff {
+				pg = 0xffff
+			}
+			if pb < 0 {
+				pb = 0
+			} else if pb > 0xffff {
+				pb = 0xffff
+			}
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_YCbCr422_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pi := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx) - src.Rect.Min.X)
+			pj := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.CStride + ((sr.Min.X+int(sx))/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			pyy1 := int(src.Y[pi]) * 0x10101
+			pcb1 := int(src.Cb[pj]) - 128
+			pcr1 := int(src.Cr[pj]) - 128
+			pr := (pyy1 + 91881*pcr1) >> 8
+			pg := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+			pb := (pyy1 + 116130*pcb1) >> 8
+			if pr < 0 {
+				pr = 0
+			} else if pr > 0xffff {
+				pr = 0xffff
+			}
+			if pg < 0 {
+				pg = 0
+			} else if pg > 0xffff {
+				pg = 0xffff
+			}
+			if pb < 0 {
+				pb = 0
+			} else if pb > 0xffff {
+				pb = 0xffff
+			}
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_YCbCr420_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pi := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx) - src.Rect.Min.X)
+			pj := ((sr.Min.Y+int(sy))/2-src.Rect.Min.Y/2)*src.CStride + ((sr.Min.X+int(sx))/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			pyy1 := int(src.Y[pi]) * 0x10101
+			pcb1 := int(src.Cb[pj]) - 128
+			pcr1 := int(src.Cr[pj]) - 128
+			pr := (pyy1 + 91881*pcr1) >> 8
+			pg := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+			pb := (pyy1 + 116130*pcb1) >> 8
+			if pr < 0 {
+				pr = 0
+			} else if pr > 0xffff {
+				pr = 0xffff
+			}
+			if pg < 0 {
+				pg = 0
+			} else if pg > 0xffff {
+				pg = 0xffff
+			}
+			if pb < 0 {
+				pb = 0
+			} else if pb > 0xffff {
+				pb = 0xffff
+			}
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_YCbCr440_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pi := (sr.Min.Y+int(sy)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx) - src.Rect.Min.X)
+			pj := ((sr.Min.Y+int(sy))/2-src.Rect.Min.Y/2)*src.CStride + (sr.Min.X + int(sx) - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			pyy1 := int(src.Y[pi]) * 0x10101
+			pcb1 := int(src.Cb[pj]) - 128
+			pcr1 := int(src.Cr[pj]) - 128
+			pr := (pyy1 + 91881*pcr1) >> 8
+			pg := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+			pb := (pyy1 + 116130*pcb1) >> 8
+			if pr < 0 {
+				pr = 0
+			} else if pr > 0xffff {
+				pr = 0xffff
+			}
+			if pg < 0 {
+				pg = 0
+			} else if pg > 0xffff {
+				pg = 0xffff
+			}
+			if pb < 0 {
+				pb = 0
+			} else if pb > 0xffff {
+				pb = 0xffff
+			}
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_Image_Over(dst *image.RGBA, dr, adr image.Rectangle, src image.Image, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pr, pg, pb, pa := src.At(sr.Min.X+int(sx), sr.Min.Y+int(sy)).RGBA()
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) scale_RGBA_Image_Src(dst *image.RGBA, dr, adr image.Rectangle, src image.Image, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pr, pg, pb, pa := src.At(sr.Min.X+int(sx), sr.Min.Y+int(sy)).RGBA()
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) scale_Image_Image_Over(dst Image, dr, adr image.Rectangle, src image.Image, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pr, pg, pb, pa := src.At(sr.Min.X+int(sx), sr.Min.Y+int(sy)).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(sx), smp.Y+sr.Min.Y+int(sy)).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+			}
+			qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+			if dstMask != nil {
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(dy)).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+			}
+			pa1 := 0xffff - pa
+			dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+			dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+			dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+			dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+			dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+		}
+	}
+}
+
+func (nnInterpolator) scale_Image_Image_Src(dst Image, dr, adr image.Rectangle, src image.Image, sr image.Rectangle, opts *Options) {
+	dw2 := uint64(dr.Dx()) * 2
+	dh2 := uint64(dr.Dy()) * 2
+	sw := uint64(sr.Dx())
+	sh := uint64(sr.Dy())
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (2*uint64(dy) + 1) * sh / dh2
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+			sx := (2*uint64(dx) + 1) * sw / dw2
+			pr, pg, pb, pa := src.At(sr.Min.X+int(sx), sr.Min.Y+int(sy)).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(sx), smp.Y+sr.Min.Y+int(sy)).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+			}
+			if dstMask != nil {
+				qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(dy)).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+				pa1 := 0xffff - ma
+				dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+				dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+				dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+				dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+			} else {
+				dstColorRGBA64.R = uint16(pr)
+				dstColorRGBA64.G = uint16(pg)
+				dstColorRGBA64.B = uint16(pb)
+				dstColorRGBA64.A = uint16(pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+			}
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_Gray_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.Gray, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pi := (sy0-src.Rect.Min.Y)*src.Stride + (sx0 - src.Rect.Min.X)
+			pr := uint32(src.Pix[pi]) * 0x101
+			out := uint8(pr >> 8)
+			dst.Pix[d+0] = out
+			dst.Pix[d+1] = out
+			dst.Pix[d+2] = out
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_NRGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.NRGBA, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pi := (sy0-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			pa := uint32(src.Pix[pi+3]) * 0x101
+			pr := uint32(src.Pix[pi+0]) * pa / 0xff
+			pg := uint32(src.Pix[pi+1]) * pa / 0xff
+			pb := uint32(src.Pix[pi+2]) * pa / 0xff
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_NRGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.NRGBA, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pi := (sy0-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			pa := uint32(src.Pix[pi+3]) * 0x101
+			pr := uint32(src.Pix[pi+0]) * pa / 0xff
+			pg := uint32(src.Pix[pi+1]) * pa / 0xff
+			pb := uint32(src.Pix[pi+2]) * pa / 0xff
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_RGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.RGBA, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pi := (sy0-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			pr := uint32(src.Pix[pi+0]) * 0x101
+			pg := uint32(src.Pix[pi+1]) * 0x101
+			pb := uint32(src.Pix[pi+2]) * 0x101
+			pa := uint32(src.Pix[pi+3]) * 0x101
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_RGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.RGBA, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pi := (sy0-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			pr := uint32(src.Pix[pi+0]) * 0x101
+			pg := uint32(src.Pix[pi+1]) * 0x101
+			pb := uint32(src.Pix[pi+2]) * 0x101
+			pa := uint32(src.Pix[pi+3]) * 0x101
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_YCbCr444_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pi := (sy0-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			pj := (sy0-src.Rect.Min.Y)*src.CStride + (sx0 - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			pyy1 := int(src.Y[pi]) * 0x10101
+			pcb1 := int(src.Cb[pj]) - 128
+			pcr1 := int(src.Cr[pj]) - 128
+			pr := (pyy1 + 91881*pcr1) >> 8
+			pg := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+			pb := (pyy1 + 116130*pcb1) >> 8
+			if pr < 0 {
+				pr = 0
+			} else if pr > 0xffff {
+				pr = 0xffff
+			}
+			if pg < 0 {
+				pg = 0
+			} else if pg > 0xffff {
+				pg = 0xffff
+			}
+			if pb < 0 {
+				pb = 0
+			} else if pb > 0xffff {
+				pb = 0xffff
+			}
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_YCbCr422_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pi := (sy0-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			pj := (sy0-src.Rect.Min.Y)*src.CStride + ((sx0)/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			pyy1 := int(src.Y[pi]) * 0x10101
+			pcb1 := int(src.Cb[pj]) - 128
+			pcr1 := int(src.Cr[pj]) - 128
+			pr := (pyy1 + 91881*pcr1) >> 8
+			pg := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+			pb := (pyy1 + 116130*pcb1) >> 8
+			if pr < 0 {
+				pr = 0
+			} else if pr > 0xffff {
+				pr = 0xffff
+			}
+			if pg < 0 {
+				pg = 0
+			} else if pg > 0xffff {
+				pg = 0xffff
+			}
+			if pb < 0 {
+				pb = 0
+			} else if pb > 0xffff {
+				pb = 0xffff
+			}
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_YCbCr420_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pi := (sy0-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			pj := ((sy0)/2-src.Rect.Min.Y/2)*src.CStride + ((sx0)/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			pyy1 := int(src.Y[pi]) * 0x10101
+			pcb1 := int(src.Cb[pj]) - 128
+			pcr1 := int(src.Cr[pj]) - 128
+			pr := (pyy1 + 91881*pcr1) >> 8
+			pg := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+			pb := (pyy1 + 116130*pcb1) >> 8
+			if pr < 0 {
+				pr = 0
+			} else if pr > 0xffff {
+				pr = 0xffff
+			}
+			if pg < 0 {
+				pg = 0
+			} else if pg > 0xffff {
+				pg = 0xffff
+			}
+			if pb < 0 {
+				pb = 0
+			} else if pb > 0xffff {
+				pb = 0xffff
+			}
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_YCbCr440_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pi := (sy0-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			pj := ((sy0)/2-src.Rect.Min.Y/2)*src.CStride + (sx0 - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			pyy1 := int(src.Y[pi]) * 0x10101
+			pcb1 := int(src.Cb[pj]) - 128
+			pcr1 := int(src.Cr[pj]) - 128
+			pr := (pyy1 + 91881*pcr1) >> 8
+			pg := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+			pb := (pyy1 + 116130*pcb1) >> 8
+			if pr < 0 {
+				pr = 0
+			} else if pr > 0xffff {
+				pr = 0xffff
+			}
+			if pg < 0 {
+				pg = 0
+			} else if pg > 0xffff {
+				pg = 0xffff
+			}
+			if pb < 0 {
+				pb = 0
+			} else if pb > 0xffff {
+				pb = 0xffff
+			}
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_Image_Over(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pr, pg, pb, pa := src.At(sx0, sy0).RGBA()
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) transform_RGBA_Image_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pr, pg, pb, pa := src.At(sx0, sy0).RGBA()
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (nnInterpolator) transform_Image_Image_Over(dst Image, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, opts *Options) {
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pr, pg, pb, pa := src.At(sx0, sy0).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sx0, smp.Y+sy0).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+			}
+			qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+			if dstMask != nil {
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(dy)).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+			}
+			pa1 := 0xffff - pa
+			dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+			dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+			dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+			dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+			dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+		}
+	}
+}
+
+func (nnInterpolator) transform_Image_Image_Src(dst Image, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, opts *Options) {
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+			sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+			if !(image.Point{sx0, sy0}).In(sr) {
+				continue
+			}
+			pr, pg, pb, pa := src.At(sx0, sy0).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sx0, smp.Y+sy0).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+			}
+			if dstMask != nil {
+				qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(dy)).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+				pa1 := 0xffff - ma
+				dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+				dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+				dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+				dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+			} else {
+				dstColorRGBA64.R = uint16(pr)
+				dstColorRGBA64.G = uint16(pg)
+				dstColorRGBA64.B = uint16(pb)
+				dstColorRGBA64.A = uint16(pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+			}
+		}
+	}
+}
+
+func (z ablInterpolator) Scale(dst Image, dr image.Rectangle, src image.Image, sr image.Rectangle, op Op, opts *Options) {
+	// Try to simplify a Scale to a Copy when DstMask is not specified.
+	// If DstMask is not nil, Copy will call Scale back with same dr and sr, and cause stack overflow.
+	if dr.Size() == sr.Size() && (opts == nil || opts.DstMask == nil) {
+		Copy(dst, dr.Min, src, sr, op, opts)
+		return
+	}
+
+	var o Options
+	if opts != nil {
+		o = *opts
+	}
+
+	// adr is the affected destination pixels.
+	adr := dst.Bounds().Intersect(dr)
+	adr, o.DstMask = clipAffectedDestRect(adr, o.DstMask, o.DstMaskP)
+	if adr.Empty() || sr.Empty() {
+		return
+	}
+	// Make adr relative to dr.Min.
+	adr = adr.Sub(dr.Min)
+	if op == Over && o.SrcMask == nil && opaque(src) {
+		op = Src
+	}
+
+	// sr is the source pixels. If it extends beyond the src bounds,
+	// we cannot use the type-specific fast paths, as they access
+	// the Pix fields directly without bounds checking.
+	//
+	// Similarly, the fast paths assume that the masks are nil.
+	if o.DstMask != nil || o.SrcMask != nil || !sr.In(src.Bounds()) {
+		switch op {
+		case Over:
+			z.scale_Image_Image_Over(dst, dr, adr, src, sr, &o)
+		case Src:
+			z.scale_Image_Image_Src(dst, dr, adr, src, sr, &o)
+		}
+	} else if _, ok := src.(*image.Uniform); ok {
+		Draw(dst, dr, src, src.Bounds().Min, op)
+	} else {
+		switch op {
+		case Over:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				switch src := src.(type) {
+				case *image.NRGBA:
+					z.scale_RGBA_NRGBA_Over(dst, dr, adr, src, sr, &o)
+				case *image.RGBA:
+					z.scale_RGBA_RGBA_Over(dst, dr, adr, src, sr, &o)
+				default:
+					z.scale_RGBA_Image_Over(dst, dr, adr, src, sr, &o)
+				}
+			default:
+				switch src := src.(type) {
+				default:
+					z.scale_Image_Image_Over(dst, dr, adr, src, sr, &o)
+				}
+			}
+		case Src:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				switch src := src.(type) {
+				case *image.Gray:
+					z.scale_RGBA_Gray_Src(dst, dr, adr, src, sr, &o)
+				case *image.NRGBA:
+					z.scale_RGBA_NRGBA_Src(dst, dr, adr, src, sr, &o)
+				case *image.RGBA:
+					z.scale_RGBA_RGBA_Src(dst, dr, adr, src, sr, &o)
+				case *image.YCbCr:
+					switch src.SubsampleRatio {
+					default:
+						z.scale_RGBA_Image_Src(dst, dr, adr, src, sr, &o)
+					case image.YCbCrSubsampleRatio444:
+						z.scale_RGBA_YCbCr444_Src(dst, dr, adr, src, sr, &o)
+					case image.YCbCrSubsampleRatio422:
+						z.scale_RGBA_YCbCr422_Src(dst, dr, adr, src, sr, &o)
+					case image.YCbCrSubsampleRatio420:
+						z.scale_RGBA_YCbCr420_Src(dst, dr, adr, src, sr, &o)
+					case image.YCbCrSubsampleRatio440:
+						z.scale_RGBA_YCbCr440_Src(dst, dr, adr, src, sr, &o)
+					}
+				default:
+					z.scale_RGBA_Image_Src(dst, dr, adr, src, sr, &o)
+				}
+			default:
+				switch src := src.(type) {
+				default:
+					z.scale_Image_Image_Src(dst, dr, adr, src, sr, &o)
+				}
+			}
+		}
+	}
+}
+
+func (z ablInterpolator) Transform(dst Image, s2d f64.Aff3, src image.Image, sr image.Rectangle, op Op, opts *Options) {
+	// Try to simplify a Transform to a Copy.
+	if s2d[0] == 1 && s2d[1] == 0 && s2d[3] == 0 && s2d[4] == 1 {
+		dx := int(s2d[2])
+		dy := int(s2d[5])
+		if float64(dx) == s2d[2] && float64(dy) == s2d[5] {
+			Copy(dst, image.Point{X: sr.Min.X + dx, Y: sr.Min.X + dy}, src, sr, op, opts)
+			return
+		}
+	}
+
+	var o Options
+	if opts != nil {
+		o = *opts
+	}
+
+	dr := transformRect(&s2d, &sr)
+	// adr is the affected destination pixels.
+	adr := dst.Bounds().Intersect(dr)
+	adr, o.DstMask = clipAffectedDestRect(adr, o.DstMask, o.DstMaskP)
+	if adr.Empty() || sr.Empty() {
+		return
+	}
+	if op == Over && o.SrcMask == nil && opaque(src) {
+		op = Src
+	}
+
+	d2s := invert(&s2d)
+	// bias is a translation of the mapping from dst coordinates to src
+	// coordinates such that the latter temporarily have non-negative X
+	// and Y coordinates. This allows us to write int(f) instead of
+	// int(math.Floor(f)), since "round to zero" and "round down" are
+	// equivalent when f >= 0, but the former is much cheaper. The X--
+	// and Y-- are because the TransformLeaf methods have a "sx -= 0.5"
+	// adjustment.
+	bias := transformRect(&d2s, &adr).Min
+	bias.X--
+	bias.Y--
+	d2s[2] -= float64(bias.X)
+	d2s[5] -= float64(bias.Y)
+	// Make adr relative to dr.Min.
+	adr = adr.Sub(dr.Min)
+	// sr is the source pixels. If it extends beyond the src bounds,
+	// we cannot use the type-specific fast paths, as they access
+	// the Pix fields directly without bounds checking.
+	//
+	// Similarly, the fast paths assume that the masks are nil.
+	if o.DstMask != nil || o.SrcMask != nil || !sr.In(src.Bounds()) {
+		switch op {
+		case Over:
+			z.transform_Image_Image_Over(dst, dr, adr, &d2s, src, sr, bias, &o)
+		case Src:
+			z.transform_Image_Image_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+		}
+	} else if u, ok := src.(*image.Uniform); ok {
+		transform_Uniform(dst, dr, adr, &d2s, u, sr, bias, op)
+	} else {
+		switch op {
+		case Over:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				switch src := src.(type) {
+				case *image.NRGBA:
+					z.transform_RGBA_NRGBA_Over(dst, dr, adr, &d2s, src, sr, bias, &o)
+				case *image.RGBA:
+					z.transform_RGBA_RGBA_Over(dst, dr, adr, &d2s, src, sr, bias, &o)
+				default:
+					z.transform_RGBA_Image_Over(dst, dr, adr, &d2s, src, sr, bias, &o)
+				}
+			default:
+				switch src := src.(type) {
+				default:
+					z.transform_Image_Image_Over(dst, dr, adr, &d2s, src, sr, bias, &o)
+				}
+			}
+		case Src:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				switch src := src.(type) {
+				case *image.Gray:
+					z.transform_RGBA_Gray_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+				case *image.NRGBA:
+					z.transform_RGBA_NRGBA_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+				case *image.RGBA:
+					z.transform_RGBA_RGBA_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+				case *image.YCbCr:
+					switch src.SubsampleRatio {
+					default:
+						z.transform_RGBA_Image_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+					case image.YCbCrSubsampleRatio444:
+						z.transform_RGBA_YCbCr444_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+					case image.YCbCrSubsampleRatio422:
+						z.transform_RGBA_YCbCr422_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+					case image.YCbCrSubsampleRatio420:
+						z.transform_RGBA_YCbCr420_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+					case image.YCbCrSubsampleRatio440:
+						z.transform_RGBA_YCbCr440_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+					}
+				default:
+					z.transform_RGBA_Image_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+				}
+			default:
+				switch src := src.(type) {
+				default:
+					z.transform_Image_Image_Src(dst, dr, adr, &d2s, src, sr, bias, &o)
+				}
+			}
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_Gray_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.Gray, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.Stride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+			s00ru := uint32(src.Pix[s00i]) * 0x101
+			s00r := float64(s00ru)
+			s10i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.Stride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+			s10ru := uint32(src.Pix[s10i]) * 0x101
+			s10r := float64(s10ru)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s01i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.Stride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+			s01ru := uint32(src.Pix[s01i]) * 0x101
+			s01r := float64(s01ru)
+			s11i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.Stride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+			s11ru := uint32(src.Pix[s11i]) * 0x101
+			s11r := float64(s11ru)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11r = yFrac1*s10r + yFrac0*s11r
+			pr := uint32(s11r)
+			out := uint8(pr >> 8)
+			dst.Pix[d+0] = out
+			dst.Pix[d+1] = out
+			dst.Pix[d+2] = out
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_NRGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, src *image.NRGBA, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx0)-src.Rect.Min.X)*4
+			s00au := uint32(src.Pix[s00i+3]) * 0x101
+			s00ru := uint32(src.Pix[s00i+0]) * s00au / 0xff
+			s00gu := uint32(src.Pix[s00i+1]) * s00au / 0xff
+			s00bu := uint32(src.Pix[s00i+2]) * s00au / 0xff
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx1)-src.Rect.Min.X)*4
+			s10au := uint32(src.Pix[s10i+3]) * 0x101
+			s10ru := uint32(src.Pix[s10i+0]) * s10au / 0xff
+			s10gu := uint32(src.Pix[s10i+1]) * s10au / 0xff
+			s10bu := uint32(src.Pix[s10i+2]) * s10au / 0xff
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx0)-src.Rect.Min.X)*4
+			s01au := uint32(src.Pix[s01i+3]) * 0x101
+			s01ru := uint32(src.Pix[s01i+0]) * s01au / 0xff
+			s01gu := uint32(src.Pix[s01i+1]) * s01au / 0xff
+			s01bu := uint32(src.Pix[s01i+2]) * s01au / 0xff
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx1)-src.Rect.Min.X)*4
+			s11au := uint32(src.Pix[s11i+3]) * 0x101
+			s11ru := uint32(src.Pix[s11i+0]) * s11au / 0xff
+			s11gu := uint32(src.Pix[s11i+1]) * s11au / 0xff
+			s11bu := uint32(src.Pix[s11i+2]) * s11au / 0xff
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_NRGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.NRGBA, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx0)-src.Rect.Min.X)*4
+			s00au := uint32(src.Pix[s00i+3]) * 0x101
+			s00ru := uint32(src.Pix[s00i+0]) * s00au / 0xff
+			s00gu := uint32(src.Pix[s00i+1]) * s00au / 0xff
+			s00bu := uint32(src.Pix[s00i+2]) * s00au / 0xff
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx1)-src.Rect.Min.X)*4
+			s10au := uint32(src.Pix[s10i+3]) * 0x101
+			s10ru := uint32(src.Pix[s10i+0]) * s10au / 0xff
+			s10gu := uint32(src.Pix[s10i+1]) * s10au / 0xff
+			s10bu := uint32(src.Pix[s10i+2]) * s10au / 0xff
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx0)-src.Rect.Min.X)*4
+			s01au := uint32(src.Pix[s01i+3]) * 0x101
+			s01ru := uint32(src.Pix[s01i+0]) * s01au / 0xff
+			s01gu := uint32(src.Pix[s01i+1]) * s01au / 0xff
+			s01bu := uint32(src.Pix[s01i+2]) * s01au / 0xff
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx1)-src.Rect.Min.X)*4
+			s11au := uint32(src.Pix[s11i+3]) * 0x101
+			s11ru := uint32(src.Pix[s11i+0]) * s11au / 0xff
+			s11gu := uint32(src.Pix[s11i+1]) * s11au / 0xff
+			s11bu := uint32(src.Pix[s11i+2]) * s11au / 0xff
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_RGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, src *image.RGBA, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx0)-src.Rect.Min.X)*4
+			s00ru := uint32(src.Pix[s00i+0]) * 0x101
+			s00gu := uint32(src.Pix[s00i+1]) * 0x101
+			s00bu := uint32(src.Pix[s00i+2]) * 0x101
+			s00au := uint32(src.Pix[s00i+3]) * 0x101
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx1)-src.Rect.Min.X)*4
+			s10ru := uint32(src.Pix[s10i+0]) * 0x101
+			s10gu := uint32(src.Pix[s10i+1]) * 0x101
+			s10bu := uint32(src.Pix[s10i+2]) * 0x101
+			s10au := uint32(src.Pix[s10i+3]) * 0x101
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx0)-src.Rect.Min.X)*4
+			s01ru := uint32(src.Pix[s01i+0]) * 0x101
+			s01gu := uint32(src.Pix[s01i+1]) * 0x101
+			s01bu := uint32(src.Pix[s01i+2]) * 0x101
+			s01au := uint32(src.Pix[s01i+3]) * 0x101
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx1)-src.Rect.Min.X)*4
+			s11ru := uint32(src.Pix[s11i+0]) * 0x101
+			s11gu := uint32(src.Pix[s11i+1]) * 0x101
+			s11bu := uint32(src.Pix[s11i+2]) * 0x101
+			s11au := uint32(src.Pix[s11i+3]) * 0x101
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_RGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.RGBA, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx0)-src.Rect.Min.X)*4
+			s00ru := uint32(src.Pix[s00i+0]) * 0x101
+			s00gu := uint32(src.Pix[s00i+1]) * 0x101
+			s00bu := uint32(src.Pix[s00i+2]) * 0x101
+			s00au := uint32(src.Pix[s00i+3]) * 0x101
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx1)-src.Rect.Min.X)*4
+			s10ru := uint32(src.Pix[s10i+0]) * 0x101
+			s10gu := uint32(src.Pix[s10i+1]) * 0x101
+			s10bu := uint32(src.Pix[s10i+2]) * 0x101
+			s10au := uint32(src.Pix[s10i+3]) * 0x101
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx0)-src.Rect.Min.X)*4
+			s01ru := uint32(src.Pix[s01i+0]) * 0x101
+			s01gu := uint32(src.Pix[s01i+1]) * 0x101
+			s01bu := uint32(src.Pix[s01i+2]) * 0x101
+			s01au := uint32(src.Pix[s01i+3]) * 0x101
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(sx1)-src.Rect.Min.X)*4
+			s11ru := uint32(src.Pix[s11i+0]) * 0x101
+			s11gu := uint32(src.Pix[s11i+1]) * 0x101
+			s11bu := uint32(src.Pix[s11i+2]) * 0x101
+			s11au := uint32(src.Pix[s11i+3]) * 0x101
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_YCbCr444_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+			s00j := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.CStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s00yy1 := int(src.Y[s00i]) * 0x10101
+			s00cb1 := int(src.Cb[s00j]) - 128
+			s00cr1 := int(src.Cr[s00j]) - 128
+			s00ru := (s00yy1 + 91881*s00cr1) >> 8
+			s00gu := (s00yy1 - 22554*s00cb1 - 46802*s00cr1) >> 8
+			s00bu := (s00yy1 + 116130*s00cb1) >> 8
+			if s00ru < 0 {
+				s00ru = 0
+			} else if s00ru > 0xffff {
+				s00ru = 0xffff
+			}
+			if s00gu < 0 {
+				s00gu = 0
+			} else if s00gu > 0xffff {
+				s00gu = 0xffff
+			}
+			if s00bu < 0 {
+				s00bu = 0
+			} else if s00bu > 0xffff {
+				s00bu = 0xffff
+			}
+
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s10i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+			s10j := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.CStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s10yy1 := int(src.Y[s10i]) * 0x10101
+			s10cb1 := int(src.Cb[s10j]) - 128
+			s10cr1 := int(src.Cr[s10j]) - 128
+			s10ru := (s10yy1 + 91881*s10cr1) >> 8
+			s10gu := (s10yy1 - 22554*s10cb1 - 46802*s10cr1) >> 8
+			s10bu := (s10yy1 + 116130*s10cb1) >> 8
+			if s10ru < 0 {
+				s10ru = 0
+			} else if s10ru > 0xffff {
+				s10ru = 0xffff
+			}
+			if s10gu < 0 {
+				s10gu = 0
+			} else if s10gu > 0xffff {
+				s10gu = 0xffff
+			}
+			if s10bu < 0 {
+				s10bu = 0
+			} else if s10bu > 0xffff {
+				s10bu = 0xffff
+			}
+
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s01i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+			s01j := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.CStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s01yy1 := int(src.Y[s01i]) * 0x10101
+			s01cb1 := int(src.Cb[s01j]) - 128
+			s01cr1 := int(src.Cr[s01j]) - 128
+			s01ru := (s01yy1 + 91881*s01cr1) >> 8
+			s01gu := (s01yy1 - 22554*s01cb1 - 46802*s01cr1) >> 8
+			s01bu := (s01yy1 + 116130*s01cb1) >> 8
+			if s01ru < 0 {
+				s01ru = 0
+			} else if s01ru > 0xffff {
+				s01ru = 0xffff
+			}
+			if s01gu < 0 {
+				s01gu = 0
+			} else if s01gu > 0xffff {
+				s01gu = 0xffff
+			}
+			if s01bu < 0 {
+				s01bu = 0
+			} else if s01bu > 0xffff {
+				s01bu = 0xffff
+			}
+
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s11i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+			s11j := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.CStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s11yy1 := int(src.Y[s11i]) * 0x10101
+			s11cb1 := int(src.Cb[s11j]) - 128
+			s11cr1 := int(src.Cr[s11j]) - 128
+			s11ru := (s11yy1 + 91881*s11cr1) >> 8
+			s11gu := (s11yy1 - 22554*s11cb1 - 46802*s11cr1) >> 8
+			s11bu := (s11yy1 + 116130*s11cb1) >> 8
+			if s11ru < 0 {
+				s11ru = 0
+			} else if s11ru > 0xffff {
+				s11ru = 0xffff
+			}
+			if s11gu < 0 {
+				s11gu = 0
+			} else if s11gu > 0xffff {
+				s11gu = 0xffff
+			}
+			if s11bu < 0 {
+				s11bu = 0
+			} else if s11bu > 0xffff {
+				s11bu = 0xffff
+			}
+
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_YCbCr422_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+			s00j := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.CStride + ((sr.Min.X+int(sx0))/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s00yy1 := int(src.Y[s00i]) * 0x10101
+			s00cb1 := int(src.Cb[s00j]) - 128
+			s00cr1 := int(src.Cr[s00j]) - 128
+			s00ru := (s00yy1 + 91881*s00cr1) >> 8
+			s00gu := (s00yy1 - 22554*s00cb1 - 46802*s00cr1) >> 8
+			s00bu := (s00yy1 + 116130*s00cb1) >> 8
+			if s00ru < 0 {
+				s00ru = 0
+			} else if s00ru > 0xffff {
+				s00ru = 0xffff
+			}
+			if s00gu < 0 {
+				s00gu = 0
+			} else if s00gu > 0xffff {
+				s00gu = 0xffff
+			}
+			if s00bu < 0 {
+				s00bu = 0
+			} else if s00bu > 0xffff {
+				s00bu = 0xffff
+			}
+
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s10i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+			s10j := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.CStride + ((sr.Min.X+int(sx1))/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s10yy1 := int(src.Y[s10i]) * 0x10101
+			s10cb1 := int(src.Cb[s10j]) - 128
+			s10cr1 := int(src.Cr[s10j]) - 128
+			s10ru := (s10yy1 + 91881*s10cr1) >> 8
+			s10gu := (s10yy1 - 22554*s10cb1 - 46802*s10cr1) >> 8
+			s10bu := (s10yy1 + 116130*s10cb1) >> 8
+			if s10ru < 0 {
+				s10ru = 0
+			} else if s10ru > 0xffff {
+				s10ru = 0xffff
+			}
+			if s10gu < 0 {
+				s10gu = 0
+			} else if s10gu > 0xffff {
+				s10gu = 0xffff
+			}
+			if s10bu < 0 {
+				s10bu = 0
+			} else if s10bu > 0xffff {
+				s10bu = 0xffff
+			}
+
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s01i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+			s01j := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.CStride + ((sr.Min.X+int(sx0))/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s01yy1 := int(src.Y[s01i]) * 0x10101
+			s01cb1 := int(src.Cb[s01j]) - 128
+			s01cr1 := int(src.Cr[s01j]) - 128
+			s01ru := (s01yy1 + 91881*s01cr1) >> 8
+			s01gu := (s01yy1 - 22554*s01cb1 - 46802*s01cr1) >> 8
+			s01bu := (s01yy1 + 116130*s01cb1) >> 8
+			if s01ru < 0 {
+				s01ru = 0
+			} else if s01ru > 0xffff {
+				s01ru = 0xffff
+			}
+			if s01gu < 0 {
+				s01gu = 0
+			} else if s01gu > 0xffff {
+				s01gu = 0xffff
+			}
+			if s01bu < 0 {
+				s01bu = 0
+			} else if s01bu > 0xffff {
+				s01bu = 0xffff
+			}
+
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s11i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+			s11j := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.CStride + ((sr.Min.X+int(sx1))/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s11yy1 := int(src.Y[s11i]) * 0x10101
+			s11cb1 := int(src.Cb[s11j]) - 128
+			s11cr1 := int(src.Cr[s11j]) - 128
+			s11ru := (s11yy1 + 91881*s11cr1) >> 8
+			s11gu := (s11yy1 - 22554*s11cb1 - 46802*s11cr1) >> 8
+			s11bu := (s11yy1 + 116130*s11cb1) >> 8
+			if s11ru < 0 {
+				s11ru = 0
+			} else if s11ru > 0xffff {
+				s11ru = 0xffff
+			}
+			if s11gu < 0 {
+				s11gu = 0
+			} else if s11gu > 0xffff {
+				s11gu = 0xffff
+			}
+			if s11bu < 0 {
+				s11bu = 0
+			} else if s11bu > 0xffff {
+				s11bu = 0xffff
+			}
+
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_YCbCr420_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+			s00j := ((sr.Min.Y+int(sy0))/2-src.Rect.Min.Y/2)*src.CStride + ((sr.Min.X+int(sx0))/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s00yy1 := int(src.Y[s00i]) * 0x10101
+			s00cb1 := int(src.Cb[s00j]) - 128
+			s00cr1 := int(src.Cr[s00j]) - 128
+			s00ru := (s00yy1 + 91881*s00cr1) >> 8
+			s00gu := (s00yy1 - 22554*s00cb1 - 46802*s00cr1) >> 8
+			s00bu := (s00yy1 + 116130*s00cb1) >> 8
+			if s00ru < 0 {
+				s00ru = 0
+			} else if s00ru > 0xffff {
+				s00ru = 0xffff
+			}
+			if s00gu < 0 {
+				s00gu = 0
+			} else if s00gu > 0xffff {
+				s00gu = 0xffff
+			}
+			if s00bu < 0 {
+				s00bu = 0
+			} else if s00bu > 0xffff {
+				s00bu = 0xffff
+			}
+
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s10i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+			s10j := ((sr.Min.Y+int(sy0))/2-src.Rect.Min.Y/2)*src.CStride + ((sr.Min.X+int(sx1))/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s10yy1 := int(src.Y[s10i]) * 0x10101
+			s10cb1 := int(src.Cb[s10j]) - 128
+			s10cr1 := int(src.Cr[s10j]) - 128
+			s10ru := (s10yy1 + 91881*s10cr1) >> 8
+			s10gu := (s10yy1 - 22554*s10cb1 - 46802*s10cr1) >> 8
+			s10bu := (s10yy1 + 116130*s10cb1) >> 8
+			if s10ru < 0 {
+				s10ru = 0
+			} else if s10ru > 0xffff {
+				s10ru = 0xffff
+			}
+			if s10gu < 0 {
+				s10gu = 0
+			} else if s10gu > 0xffff {
+				s10gu = 0xffff
+			}
+			if s10bu < 0 {
+				s10bu = 0
+			} else if s10bu > 0xffff {
+				s10bu = 0xffff
+			}
+
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s01i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+			s01j := ((sr.Min.Y+int(sy1))/2-src.Rect.Min.Y/2)*src.CStride + ((sr.Min.X+int(sx0))/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s01yy1 := int(src.Y[s01i]) * 0x10101
+			s01cb1 := int(src.Cb[s01j]) - 128
+			s01cr1 := int(src.Cr[s01j]) - 128
+			s01ru := (s01yy1 + 91881*s01cr1) >> 8
+			s01gu := (s01yy1 - 22554*s01cb1 - 46802*s01cr1) >> 8
+			s01bu := (s01yy1 + 116130*s01cb1) >> 8
+			if s01ru < 0 {
+				s01ru = 0
+			} else if s01ru > 0xffff {
+				s01ru = 0xffff
+			}
+			if s01gu < 0 {
+				s01gu = 0
+			} else if s01gu > 0xffff {
+				s01gu = 0xffff
+			}
+			if s01bu < 0 {
+				s01bu = 0
+			} else if s01bu > 0xffff {
+				s01bu = 0xffff
+			}
+
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s11i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+			s11j := ((sr.Min.Y+int(sy1))/2-src.Rect.Min.Y/2)*src.CStride + ((sr.Min.X+int(sx1))/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s11yy1 := int(src.Y[s11i]) * 0x10101
+			s11cb1 := int(src.Cb[s11j]) - 128
+			s11cr1 := int(src.Cr[s11j]) - 128
+			s11ru := (s11yy1 + 91881*s11cr1) >> 8
+			s11gu := (s11yy1 - 22554*s11cb1 - 46802*s11cr1) >> 8
+			s11bu := (s11yy1 + 116130*s11cb1) >> 8
+			if s11ru < 0 {
+				s11ru = 0
+			} else if s11ru > 0xffff {
+				s11ru = 0xffff
+			}
+			if s11gu < 0 {
+				s11gu = 0
+			} else if s11gu > 0xffff {
+				s11gu = 0xffff
+			}
+			if s11bu < 0 {
+				s11bu = 0
+			} else if s11bu > 0xffff {
+				s11bu = 0xffff
+			}
+
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_YCbCr440_Src(dst *image.RGBA, dr, adr image.Rectangle, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+			s00j := ((sr.Min.Y+int(sy0))/2-src.Rect.Min.Y/2)*src.CStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s00yy1 := int(src.Y[s00i]) * 0x10101
+			s00cb1 := int(src.Cb[s00j]) - 128
+			s00cr1 := int(src.Cr[s00j]) - 128
+			s00ru := (s00yy1 + 91881*s00cr1) >> 8
+			s00gu := (s00yy1 - 22554*s00cb1 - 46802*s00cr1) >> 8
+			s00bu := (s00yy1 + 116130*s00cb1) >> 8
+			if s00ru < 0 {
+				s00ru = 0
+			} else if s00ru > 0xffff {
+				s00ru = 0xffff
+			}
+			if s00gu < 0 {
+				s00gu = 0
+			} else if s00gu > 0xffff {
+				s00gu = 0xffff
+			}
+			if s00bu < 0 {
+				s00bu = 0
+			} else if s00bu > 0xffff {
+				s00bu = 0xffff
+			}
+
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s10i := (sr.Min.Y+int(sy0)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+			s10j := ((sr.Min.Y+int(sy0))/2-src.Rect.Min.Y/2)*src.CStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s10yy1 := int(src.Y[s10i]) * 0x10101
+			s10cb1 := int(src.Cb[s10j]) - 128
+			s10cr1 := int(src.Cr[s10j]) - 128
+			s10ru := (s10yy1 + 91881*s10cr1) >> 8
+			s10gu := (s10yy1 - 22554*s10cb1 - 46802*s10cr1) >> 8
+			s10bu := (s10yy1 + 116130*s10cb1) >> 8
+			if s10ru < 0 {
+				s10ru = 0
+			} else if s10ru > 0xffff {
+				s10ru = 0xffff
+			}
+			if s10gu < 0 {
+				s10gu = 0
+			} else if s10gu > 0xffff {
+				s10gu = 0xffff
+			}
+			if s10bu < 0 {
+				s10bu = 0
+			} else if s10bu > 0xffff {
+				s10bu = 0xffff
+			}
+
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s01i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+			s01j := ((sr.Min.Y+int(sy1))/2-src.Rect.Min.Y/2)*src.CStride + (sr.Min.X + int(sx0) - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s01yy1 := int(src.Y[s01i]) * 0x10101
+			s01cb1 := int(src.Cb[s01j]) - 128
+			s01cr1 := int(src.Cr[s01j]) - 128
+			s01ru := (s01yy1 + 91881*s01cr1) >> 8
+			s01gu := (s01yy1 - 22554*s01cb1 - 46802*s01cr1) >> 8
+			s01bu := (s01yy1 + 116130*s01cb1) >> 8
+			if s01ru < 0 {
+				s01ru = 0
+			} else if s01ru > 0xffff {
+				s01ru = 0xffff
+			}
+			if s01gu < 0 {
+				s01gu = 0
+			} else if s01gu > 0xffff {
+				s01gu = 0xffff
+			}
+			if s01bu < 0 {
+				s01bu = 0
+			} else if s01bu > 0xffff {
+				s01bu = 0xffff
+			}
+
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s11i := (sr.Min.Y+int(sy1)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+			s11j := ((sr.Min.Y+int(sy1))/2-src.Rect.Min.Y/2)*src.CStride + (sr.Min.X + int(sx1) - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s11yy1 := int(src.Y[s11i]) * 0x10101
+			s11cb1 := int(src.Cb[s11j]) - 128
+			s11cr1 := int(src.Cr[s11j]) - 128
+			s11ru := (s11yy1 + 91881*s11cr1) >> 8
+			s11gu := (s11yy1 - 22554*s11cb1 - 46802*s11cr1) >> 8
+			s11bu := (s11yy1 + 116130*s11cb1) >> 8
+			if s11ru < 0 {
+				s11ru = 0
+			} else if s11ru > 0xffff {
+				s11ru = 0xffff
+			}
+			if s11gu < 0 {
+				s11gu = 0
+			} else if s11gu > 0xffff {
+				s11gu = 0xffff
+			}
+			if s11bu < 0 {
+				s11bu = 0
+			} else if s11bu > 0xffff {
+				s11bu = 0xffff
+			}
+
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_Image_Over(dst *image.RGBA, dr, adr image.Rectangle, src image.Image, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00ru, s00gu, s00bu, s00au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy0)).RGBA()
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10ru, s10gu, s10bu, s10au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy0)).RGBA()
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01ru, s01gu, s01bu, s01au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy1)).RGBA()
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11ru, s11gu, s11bu, s11au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy1)).RGBA()
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) scale_RGBA_Image_Src(dst *image.RGBA, dr, adr image.Rectangle, src image.Image, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00ru, s00gu, s00bu, s00au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy0)).RGBA()
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10ru, s10gu, s10bu, s10au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy0)).RGBA()
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01ru, s01gu, s01bu, s01au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy1)).RGBA()
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11ru, s11gu, s11bu, s11au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy1)).RGBA()
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) scale_Image_Image_Over(dst Image, dr, adr image.Rectangle, src image.Image, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00ru, s00gu, s00bu, s00au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy0)).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(sx0), smp.Y+sr.Min.Y+int(sy0)).RGBA()
+				s00ru = s00ru * ma / 0xffff
+				s00gu = s00gu * ma / 0xffff
+				s00bu = s00bu * ma / 0xffff
+				s00au = s00au * ma / 0xffff
+			}
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10ru, s10gu, s10bu, s10au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy0)).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(sx1), smp.Y+sr.Min.Y+int(sy0)).RGBA()
+				s10ru = s10ru * ma / 0xffff
+				s10gu = s10gu * ma / 0xffff
+				s10bu = s10bu * ma / 0xffff
+				s10au = s10au * ma / 0xffff
+			}
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01ru, s01gu, s01bu, s01au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy1)).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(sx0), smp.Y+sr.Min.Y+int(sy1)).RGBA()
+				s01ru = s01ru * ma / 0xffff
+				s01gu = s01gu * ma / 0xffff
+				s01bu = s01bu * ma / 0xffff
+				s01au = s01au * ma / 0xffff
+			}
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11ru, s11gu, s11bu, s11au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy1)).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(sx1), smp.Y+sr.Min.Y+int(sy1)).RGBA()
+				s11ru = s11ru * ma / 0xffff
+				s11gu = s11gu * ma / 0xffff
+				s11bu = s11bu * ma / 0xffff
+				s11au = s11au * ma / 0xffff
+			}
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+			if dstMask != nil {
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(dy)).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+			}
+			pa1 := 0xffff - pa
+			dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+			dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+			dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+			dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+			dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+		}
+	}
+}
+
+func (ablInterpolator) scale_Image_Image_Src(dst Image, dr, adr image.Rectangle, src image.Image, sr image.Rectangle, opts *Options) {
+	sw := int32(sr.Dx())
+	sh := int32(sr.Dy())
+	yscale := float64(sh) / float64(dr.Dy())
+	xscale := float64(sw) / float64(dr.Dx())
+	swMinus1, shMinus1 := sw-1, sh-1
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		sy := (float64(dy)+0.5)*yscale - 0.5
+		// If sy < 0, we will clamp sy0 to 0 anyway, so it doesn't matter if
+		// we say int32(sy) instead of int32(math.Floor(sy)). Similarly for
+		// sx, below.
+		sy0 := int32(sy)
+		yFrac0 := sy - float64(sy0)
+		yFrac1 := 1 - yFrac0
+		sy1 := sy0 + 1
+		if sy < 0 {
+			sy0, sy1 = 0, 0
+			yFrac0, yFrac1 = 0, 1
+		} else if sy1 > shMinus1 {
+			sy0, sy1 = shMinus1, shMinus1
+			yFrac0, yFrac1 = 1, 0
+		}
+
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+			sx := (float64(dx)+0.5)*xscale - 0.5
+			sx0 := int32(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx1 := sx0 + 1
+			if sx < 0 {
+				sx0, sx1 = 0, 0
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 > swMinus1 {
+				sx0, sx1 = swMinus1, swMinus1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			s00ru, s00gu, s00bu, s00au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy0)).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(sx0), smp.Y+sr.Min.Y+int(sy0)).RGBA()
+				s00ru = s00ru * ma / 0xffff
+				s00gu = s00gu * ma / 0xffff
+				s00bu = s00bu * ma / 0xffff
+				s00au = s00au * ma / 0xffff
+			}
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10ru, s10gu, s10bu, s10au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy0)).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(sx1), smp.Y+sr.Min.Y+int(sy0)).RGBA()
+				s10ru = s10ru * ma / 0xffff
+				s10gu = s10gu * ma / 0xffff
+				s10bu = s10bu * ma / 0xffff
+				s10au = s10au * ma / 0xffff
+			}
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01ru, s01gu, s01bu, s01au := src.At(sr.Min.X+int(sx0), sr.Min.Y+int(sy1)).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(sx0), smp.Y+sr.Min.Y+int(sy1)).RGBA()
+				s01ru = s01ru * ma / 0xffff
+				s01gu = s01gu * ma / 0xffff
+				s01bu = s01bu * ma / 0xffff
+				s01au = s01au * ma / 0xffff
+			}
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11ru, s11gu, s11bu, s11au := src.At(sr.Min.X+int(sx1), sr.Min.Y+int(sy1)).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(sx1), smp.Y+sr.Min.Y+int(sy1)).RGBA()
+				s11ru = s11ru * ma / 0xffff
+				s11gu = s11gu * ma / 0xffff
+				s11bu = s11bu * ma / 0xffff
+				s11au = s11au * ma / 0xffff
+			}
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			if dstMask != nil {
+				qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(dy)).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+				pa1 := 0xffff - ma
+				dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+				dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+				dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+				dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+			} else {
+				dstColorRGBA64.R = uint16(pr)
+				dstColorRGBA64.G = uint16(pg)
+				dstColorRGBA64.B = uint16(pb)
+				dstColorRGBA64.A = uint16(pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+			}
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_Gray_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.Gray, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00i := (sy0-src.Rect.Min.Y)*src.Stride + (sx0 - src.Rect.Min.X)
+			s00ru := uint32(src.Pix[s00i]) * 0x101
+			s00r := float64(s00ru)
+			s10i := (sy0-src.Rect.Min.Y)*src.Stride + (sx1 - src.Rect.Min.X)
+			s10ru := uint32(src.Pix[s10i]) * 0x101
+			s10r := float64(s10ru)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s01i := (sy1-src.Rect.Min.Y)*src.Stride + (sx0 - src.Rect.Min.X)
+			s01ru := uint32(src.Pix[s01i]) * 0x101
+			s01r := float64(s01ru)
+			s11i := (sy1-src.Rect.Min.Y)*src.Stride + (sx1 - src.Rect.Min.X)
+			s11ru := uint32(src.Pix[s11i]) * 0x101
+			s11r := float64(s11ru)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11r = yFrac1*s10r + yFrac0*s11r
+			pr := uint32(s11r)
+			out := uint8(pr >> 8)
+			dst.Pix[d+0] = out
+			dst.Pix[d+1] = out
+			dst.Pix[d+2] = out
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_NRGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.NRGBA, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00i := (sy0-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			s00au := uint32(src.Pix[s00i+3]) * 0x101
+			s00ru := uint32(src.Pix[s00i+0]) * s00au / 0xff
+			s00gu := uint32(src.Pix[s00i+1]) * s00au / 0xff
+			s00bu := uint32(src.Pix[s00i+2]) * s00au / 0xff
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10i := (sy0-src.Rect.Min.Y)*src.Stride + (sx1-src.Rect.Min.X)*4
+			s10au := uint32(src.Pix[s10i+3]) * 0x101
+			s10ru := uint32(src.Pix[s10i+0]) * s10au / 0xff
+			s10gu := uint32(src.Pix[s10i+1]) * s10au / 0xff
+			s10bu := uint32(src.Pix[s10i+2]) * s10au / 0xff
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01i := (sy1-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			s01au := uint32(src.Pix[s01i+3]) * 0x101
+			s01ru := uint32(src.Pix[s01i+0]) * s01au / 0xff
+			s01gu := uint32(src.Pix[s01i+1]) * s01au / 0xff
+			s01bu := uint32(src.Pix[s01i+2]) * s01au / 0xff
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11i := (sy1-src.Rect.Min.Y)*src.Stride + (sx1-src.Rect.Min.X)*4
+			s11au := uint32(src.Pix[s11i+3]) * 0x101
+			s11ru := uint32(src.Pix[s11i+0]) * s11au / 0xff
+			s11gu := uint32(src.Pix[s11i+1]) * s11au / 0xff
+			s11bu := uint32(src.Pix[s11i+2]) * s11au / 0xff
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_NRGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.NRGBA, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00i := (sy0-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			s00au := uint32(src.Pix[s00i+3]) * 0x101
+			s00ru := uint32(src.Pix[s00i+0]) * s00au / 0xff
+			s00gu := uint32(src.Pix[s00i+1]) * s00au / 0xff
+			s00bu := uint32(src.Pix[s00i+2]) * s00au / 0xff
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10i := (sy0-src.Rect.Min.Y)*src.Stride + (sx1-src.Rect.Min.X)*4
+			s10au := uint32(src.Pix[s10i+3]) * 0x101
+			s10ru := uint32(src.Pix[s10i+0]) * s10au / 0xff
+			s10gu := uint32(src.Pix[s10i+1]) * s10au / 0xff
+			s10bu := uint32(src.Pix[s10i+2]) * s10au / 0xff
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01i := (sy1-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			s01au := uint32(src.Pix[s01i+3]) * 0x101
+			s01ru := uint32(src.Pix[s01i+0]) * s01au / 0xff
+			s01gu := uint32(src.Pix[s01i+1]) * s01au / 0xff
+			s01bu := uint32(src.Pix[s01i+2]) * s01au / 0xff
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11i := (sy1-src.Rect.Min.Y)*src.Stride + (sx1-src.Rect.Min.X)*4
+			s11au := uint32(src.Pix[s11i+3]) * 0x101
+			s11ru := uint32(src.Pix[s11i+0]) * s11au / 0xff
+			s11gu := uint32(src.Pix[s11i+1]) * s11au / 0xff
+			s11bu := uint32(src.Pix[s11i+2]) * s11au / 0xff
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_RGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.RGBA, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00i := (sy0-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			s00ru := uint32(src.Pix[s00i+0]) * 0x101
+			s00gu := uint32(src.Pix[s00i+1]) * 0x101
+			s00bu := uint32(src.Pix[s00i+2]) * 0x101
+			s00au := uint32(src.Pix[s00i+3]) * 0x101
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10i := (sy0-src.Rect.Min.Y)*src.Stride + (sx1-src.Rect.Min.X)*4
+			s10ru := uint32(src.Pix[s10i+0]) * 0x101
+			s10gu := uint32(src.Pix[s10i+1]) * 0x101
+			s10bu := uint32(src.Pix[s10i+2]) * 0x101
+			s10au := uint32(src.Pix[s10i+3]) * 0x101
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01i := (sy1-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			s01ru := uint32(src.Pix[s01i+0]) * 0x101
+			s01gu := uint32(src.Pix[s01i+1]) * 0x101
+			s01bu := uint32(src.Pix[s01i+2]) * 0x101
+			s01au := uint32(src.Pix[s01i+3]) * 0x101
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11i := (sy1-src.Rect.Min.Y)*src.Stride + (sx1-src.Rect.Min.X)*4
+			s11ru := uint32(src.Pix[s11i+0]) * 0x101
+			s11gu := uint32(src.Pix[s11i+1]) * 0x101
+			s11bu := uint32(src.Pix[s11i+2]) * 0x101
+			s11au := uint32(src.Pix[s11i+3]) * 0x101
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_RGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.RGBA, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00i := (sy0-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			s00ru := uint32(src.Pix[s00i+0]) * 0x101
+			s00gu := uint32(src.Pix[s00i+1]) * 0x101
+			s00bu := uint32(src.Pix[s00i+2]) * 0x101
+			s00au := uint32(src.Pix[s00i+3]) * 0x101
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10i := (sy0-src.Rect.Min.Y)*src.Stride + (sx1-src.Rect.Min.X)*4
+			s10ru := uint32(src.Pix[s10i+0]) * 0x101
+			s10gu := uint32(src.Pix[s10i+1]) * 0x101
+			s10bu := uint32(src.Pix[s10i+2]) * 0x101
+			s10au := uint32(src.Pix[s10i+3]) * 0x101
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01i := (sy1-src.Rect.Min.Y)*src.Stride + (sx0-src.Rect.Min.X)*4
+			s01ru := uint32(src.Pix[s01i+0]) * 0x101
+			s01gu := uint32(src.Pix[s01i+1]) * 0x101
+			s01bu := uint32(src.Pix[s01i+2]) * 0x101
+			s01au := uint32(src.Pix[s01i+3]) * 0x101
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11i := (sy1-src.Rect.Min.Y)*src.Stride + (sx1-src.Rect.Min.X)*4
+			s11ru := uint32(src.Pix[s11i+0]) * 0x101
+			s11gu := uint32(src.Pix[s11i+1]) * 0x101
+			s11bu := uint32(src.Pix[s11i+2]) * 0x101
+			s11au := uint32(src.Pix[s11i+3]) * 0x101
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_YCbCr444_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00i := (sy0-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			s00j := (sy0-src.Rect.Min.Y)*src.CStride + (sx0 - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s00yy1 := int(src.Y[s00i]) * 0x10101
+			s00cb1 := int(src.Cb[s00j]) - 128
+			s00cr1 := int(src.Cr[s00j]) - 128
+			s00ru := (s00yy1 + 91881*s00cr1) >> 8
+			s00gu := (s00yy1 - 22554*s00cb1 - 46802*s00cr1) >> 8
+			s00bu := (s00yy1 + 116130*s00cb1) >> 8
+			if s00ru < 0 {
+				s00ru = 0
+			} else if s00ru > 0xffff {
+				s00ru = 0xffff
+			}
+			if s00gu < 0 {
+				s00gu = 0
+			} else if s00gu > 0xffff {
+				s00gu = 0xffff
+			}
+			if s00bu < 0 {
+				s00bu = 0
+			} else if s00bu > 0xffff {
+				s00bu = 0xffff
+			}
+
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s10i := (sy0-src.Rect.Min.Y)*src.YStride + (sx1 - src.Rect.Min.X)
+			s10j := (sy0-src.Rect.Min.Y)*src.CStride + (sx1 - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s10yy1 := int(src.Y[s10i]) * 0x10101
+			s10cb1 := int(src.Cb[s10j]) - 128
+			s10cr1 := int(src.Cr[s10j]) - 128
+			s10ru := (s10yy1 + 91881*s10cr1) >> 8
+			s10gu := (s10yy1 - 22554*s10cb1 - 46802*s10cr1) >> 8
+			s10bu := (s10yy1 + 116130*s10cb1) >> 8
+			if s10ru < 0 {
+				s10ru = 0
+			} else if s10ru > 0xffff {
+				s10ru = 0xffff
+			}
+			if s10gu < 0 {
+				s10gu = 0
+			} else if s10gu > 0xffff {
+				s10gu = 0xffff
+			}
+			if s10bu < 0 {
+				s10bu = 0
+			} else if s10bu > 0xffff {
+				s10bu = 0xffff
+			}
+
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s01i := (sy1-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			s01j := (sy1-src.Rect.Min.Y)*src.CStride + (sx0 - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s01yy1 := int(src.Y[s01i]) * 0x10101
+			s01cb1 := int(src.Cb[s01j]) - 128
+			s01cr1 := int(src.Cr[s01j]) - 128
+			s01ru := (s01yy1 + 91881*s01cr1) >> 8
+			s01gu := (s01yy1 - 22554*s01cb1 - 46802*s01cr1) >> 8
+			s01bu := (s01yy1 + 116130*s01cb1) >> 8
+			if s01ru < 0 {
+				s01ru = 0
+			} else if s01ru > 0xffff {
+				s01ru = 0xffff
+			}
+			if s01gu < 0 {
+				s01gu = 0
+			} else if s01gu > 0xffff {
+				s01gu = 0xffff
+			}
+			if s01bu < 0 {
+				s01bu = 0
+			} else if s01bu > 0xffff {
+				s01bu = 0xffff
+			}
+
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s11i := (sy1-src.Rect.Min.Y)*src.YStride + (sx1 - src.Rect.Min.X)
+			s11j := (sy1-src.Rect.Min.Y)*src.CStride + (sx1 - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s11yy1 := int(src.Y[s11i]) * 0x10101
+			s11cb1 := int(src.Cb[s11j]) - 128
+			s11cr1 := int(src.Cr[s11j]) - 128
+			s11ru := (s11yy1 + 91881*s11cr1) >> 8
+			s11gu := (s11yy1 - 22554*s11cb1 - 46802*s11cr1) >> 8
+			s11bu := (s11yy1 + 116130*s11cb1) >> 8
+			if s11ru < 0 {
+				s11ru = 0
+			} else if s11ru > 0xffff {
+				s11ru = 0xffff
+			}
+			if s11gu < 0 {
+				s11gu = 0
+			} else if s11gu > 0xffff {
+				s11gu = 0xffff
+			}
+			if s11bu < 0 {
+				s11bu = 0
+			} else if s11bu > 0xffff {
+				s11bu = 0xffff
+			}
+
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_YCbCr422_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00i := (sy0-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			s00j := (sy0-src.Rect.Min.Y)*src.CStride + ((sx0)/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s00yy1 := int(src.Y[s00i]) * 0x10101
+			s00cb1 := int(src.Cb[s00j]) - 128
+			s00cr1 := int(src.Cr[s00j]) - 128
+			s00ru := (s00yy1 + 91881*s00cr1) >> 8
+			s00gu := (s00yy1 - 22554*s00cb1 - 46802*s00cr1) >> 8
+			s00bu := (s00yy1 + 116130*s00cb1) >> 8
+			if s00ru < 0 {
+				s00ru = 0
+			} else if s00ru > 0xffff {
+				s00ru = 0xffff
+			}
+			if s00gu < 0 {
+				s00gu = 0
+			} else if s00gu > 0xffff {
+				s00gu = 0xffff
+			}
+			if s00bu < 0 {
+				s00bu = 0
+			} else if s00bu > 0xffff {
+				s00bu = 0xffff
+			}
+
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s10i := (sy0-src.Rect.Min.Y)*src.YStride + (sx1 - src.Rect.Min.X)
+			s10j := (sy0-src.Rect.Min.Y)*src.CStride + ((sx1)/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s10yy1 := int(src.Y[s10i]) * 0x10101
+			s10cb1 := int(src.Cb[s10j]) - 128
+			s10cr1 := int(src.Cr[s10j]) - 128
+			s10ru := (s10yy1 + 91881*s10cr1) >> 8
+			s10gu := (s10yy1 - 22554*s10cb1 - 46802*s10cr1) >> 8
+			s10bu := (s10yy1 + 116130*s10cb1) >> 8
+			if s10ru < 0 {
+				s10ru = 0
+			} else if s10ru > 0xffff {
+				s10ru = 0xffff
+			}
+			if s10gu < 0 {
+				s10gu = 0
+			} else if s10gu > 0xffff {
+				s10gu = 0xffff
+			}
+			if s10bu < 0 {
+				s10bu = 0
+			} else if s10bu > 0xffff {
+				s10bu = 0xffff
+			}
+
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s01i := (sy1-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			s01j := (sy1-src.Rect.Min.Y)*src.CStride + ((sx0)/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s01yy1 := int(src.Y[s01i]) * 0x10101
+			s01cb1 := int(src.Cb[s01j]) - 128
+			s01cr1 := int(src.Cr[s01j]) - 128
+			s01ru := (s01yy1 + 91881*s01cr1) >> 8
+			s01gu := (s01yy1 - 22554*s01cb1 - 46802*s01cr1) >> 8
+			s01bu := (s01yy1 + 116130*s01cb1) >> 8
+			if s01ru < 0 {
+				s01ru = 0
+			} else if s01ru > 0xffff {
+				s01ru = 0xffff
+			}
+			if s01gu < 0 {
+				s01gu = 0
+			} else if s01gu > 0xffff {
+				s01gu = 0xffff
+			}
+			if s01bu < 0 {
+				s01bu = 0
+			} else if s01bu > 0xffff {
+				s01bu = 0xffff
+			}
+
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s11i := (sy1-src.Rect.Min.Y)*src.YStride + (sx1 - src.Rect.Min.X)
+			s11j := (sy1-src.Rect.Min.Y)*src.CStride + ((sx1)/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s11yy1 := int(src.Y[s11i]) * 0x10101
+			s11cb1 := int(src.Cb[s11j]) - 128
+			s11cr1 := int(src.Cr[s11j]) - 128
+			s11ru := (s11yy1 + 91881*s11cr1) >> 8
+			s11gu := (s11yy1 - 22554*s11cb1 - 46802*s11cr1) >> 8
+			s11bu := (s11yy1 + 116130*s11cb1) >> 8
+			if s11ru < 0 {
+				s11ru = 0
+			} else if s11ru > 0xffff {
+				s11ru = 0xffff
+			}
+			if s11gu < 0 {
+				s11gu = 0
+			} else if s11gu > 0xffff {
+				s11gu = 0xffff
+			}
+			if s11bu < 0 {
+				s11bu = 0
+			} else if s11bu > 0xffff {
+				s11bu = 0xffff
+			}
+
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_YCbCr420_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00i := (sy0-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			s00j := ((sy0)/2-src.Rect.Min.Y/2)*src.CStride + ((sx0)/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s00yy1 := int(src.Y[s00i]) * 0x10101
+			s00cb1 := int(src.Cb[s00j]) - 128
+			s00cr1 := int(src.Cr[s00j]) - 128
+			s00ru := (s00yy1 + 91881*s00cr1) >> 8
+			s00gu := (s00yy1 - 22554*s00cb1 - 46802*s00cr1) >> 8
+			s00bu := (s00yy1 + 116130*s00cb1) >> 8
+			if s00ru < 0 {
+				s00ru = 0
+			} else if s00ru > 0xffff {
+				s00ru = 0xffff
+			}
+			if s00gu < 0 {
+				s00gu = 0
+			} else if s00gu > 0xffff {
+				s00gu = 0xffff
+			}
+			if s00bu < 0 {
+				s00bu = 0
+			} else if s00bu > 0xffff {
+				s00bu = 0xffff
+			}
+
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s10i := (sy0-src.Rect.Min.Y)*src.YStride + (sx1 - src.Rect.Min.X)
+			s10j := ((sy0)/2-src.Rect.Min.Y/2)*src.CStride + ((sx1)/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s10yy1 := int(src.Y[s10i]) * 0x10101
+			s10cb1 := int(src.Cb[s10j]) - 128
+			s10cr1 := int(src.Cr[s10j]) - 128
+			s10ru := (s10yy1 + 91881*s10cr1) >> 8
+			s10gu := (s10yy1 - 22554*s10cb1 - 46802*s10cr1) >> 8
+			s10bu := (s10yy1 + 116130*s10cb1) >> 8
+			if s10ru < 0 {
+				s10ru = 0
+			} else if s10ru > 0xffff {
+				s10ru = 0xffff
+			}
+			if s10gu < 0 {
+				s10gu = 0
+			} else if s10gu > 0xffff {
+				s10gu = 0xffff
+			}
+			if s10bu < 0 {
+				s10bu = 0
+			} else if s10bu > 0xffff {
+				s10bu = 0xffff
+			}
+
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s01i := (sy1-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			s01j := ((sy1)/2-src.Rect.Min.Y/2)*src.CStride + ((sx0)/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s01yy1 := int(src.Y[s01i]) * 0x10101
+			s01cb1 := int(src.Cb[s01j]) - 128
+			s01cr1 := int(src.Cr[s01j]) - 128
+			s01ru := (s01yy1 + 91881*s01cr1) >> 8
+			s01gu := (s01yy1 - 22554*s01cb1 - 46802*s01cr1) >> 8
+			s01bu := (s01yy1 + 116130*s01cb1) >> 8
+			if s01ru < 0 {
+				s01ru = 0
+			} else if s01ru > 0xffff {
+				s01ru = 0xffff
+			}
+			if s01gu < 0 {
+				s01gu = 0
+			} else if s01gu > 0xffff {
+				s01gu = 0xffff
+			}
+			if s01bu < 0 {
+				s01bu = 0
+			} else if s01bu > 0xffff {
+				s01bu = 0xffff
+			}
+
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s11i := (sy1-src.Rect.Min.Y)*src.YStride + (sx1 - src.Rect.Min.X)
+			s11j := ((sy1)/2-src.Rect.Min.Y/2)*src.CStride + ((sx1)/2 - src.Rect.Min.X/2)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s11yy1 := int(src.Y[s11i]) * 0x10101
+			s11cb1 := int(src.Cb[s11j]) - 128
+			s11cr1 := int(src.Cr[s11j]) - 128
+			s11ru := (s11yy1 + 91881*s11cr1) >> 8
+			s11gu := (s11yy1 - 22554*s11cb1 - 46802*s11cr1) >> 8
+			s11bu := (s11yy1 + 116130*s11cb1) >> 8
+			if s11ru < 0 {
+				s11ru = 0
+			} else if s11ru > 0xffff {
+				s11ru = 0xffff
+			}
+			if s11gu < 0 {
+				s11gu = 0
+			} else if s11gu > 0xffff {
+				s11gu = 0xffff
+			}
+			if s11bu < 0 {
+				s11bu = 0
+			} else if s11bu > 0xffff {
+				s11bu = 0xffff
+			}
+
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_YCbCr440_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00i := (sy0-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			s00j := ((sy0)/2-src.Rect.Min.Y/2)*src.CStride + (sx0 - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s00yy1 := int(src.Y[s00i]) * 0x10101
+			s00cb1 := int(src.Cb[s00j]) - 128
+			s00cr1 := int(src.Cr[s00j]) - 128
+			s00ru := (s00yy1 + 91881*s00cr1) >> 8
+			s00gu := (s00yy1 - 22554*s00cb1 - 46802*s00cr1) >> 8
+			s00bu := (s00yy1 + 116130*s00cb1) >> 8
+			if s00ru < 0 {
+				s00ru = 0
+			} else if s00ru > 0xffff {
+				s00ru = 0xffff
+			}
+			if s00gu < 0 {
+				s00gu = 0
+			} else if s00gu > 0xffff {
+				s00gu = 0xffff
+			}
+			if s00bu < 0 {
+				s00bu = 0
+			} else if s00bu > 0xffff {
+				s00bu = 0xffff
+			}
+
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s10i := (sy0-src.Rect.Min.Y)*src.YStride + (sx1 - src.Rect.Min.X)
+			s10j := ((sy0)/2-src.Rect.Min.Y/2)*src.CStride + (sx1 - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s10yy1 := int(src.Y[s10i]) * 0x10101
+			s10cb1 := int(src.Cb[s10j]) - 128
+			s10cr1 := int(src.Cr[s10j]) - 128
+			s10ru := (s10yy1 + 91881*s10cr1) >> 8
+			s10gu := (s10yy1 - 22554*s10cb1 - 46802*s10cr1) >> 8
+			s10bu := (s10yy1 + 116130*s10cb1) >> 8
+			if s10ru < 0 {
+				s10ru = 0
+			} else if s10ru > 0xffff {
+				s10ru = 0xffff
+			}
+			if s10gu < 0 {
+				s10gu = 0
+			} else if s10gu > 0xffff {
+				s10gu = 0xffff
+			}
+			if s10bu < 0 {
+				s10bu = 0
+			} else if s10bu > 0xffff {
+				s10bu = 0xffff
+			}
+
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s01i := (sy1-src.Rect.Min.Y)*src.YStride + (sx0 - src.Rect.Min.X)
+			s01j := ((sy1)/2-src.Rect.Min.Y/2)*src.CStride + (sx0 - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s01yy1 := int(src.Y[s01i]) * 0x10101
+			s01cb1 := int(src.Cb[s01j]) - 128
+			s01cr1 := int(src.Cr[s01j]) - 128
+			s01ru := (s01yy1 + 91881*s01cr1) >> 8
+			s01gu := (s01yy1 - 22554*s01cb1 - 46802*s01cr1) >> 8
+			s01bu := (s01yy1 + 116130*s01cb1) >> 8
+			if s01ru < 0 {
+				s01ru = 0
+			} else if s01ru > 0xffff {
+				s01ru = 0xffff
+			}
+			if s01gu < 0 {
+				s01gu = 0
+			} else if s01gu > 0xffff {
+				s01gu = 0xffff
+			}
+			if s01bu < 0 {
+				s01bu = 0
+			} else if s01bu > 0xffff {
+				s01bu = 0xffff
+			}
+
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s11i := (sy1-src.Rect.Min.Y)*src.YStride + (sx1 - src.Rect.Min.X)
+			s11j := ((sy1)/2-src.Rect.Min.Y/2)*src.CStride + (sx1 - src.Rect.Min.X)
+
+			// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+			s11yy1 := int(src.Y[s11i]) * 0x10101
+			s11cb1 := int(src.Cb[s11j]) - 128
+			s11cr1 := int(src.Cr[s11j]) - 128
+			s11ru := (s11yy1 + 91881*s11cr1) >> 8
+			s11gu := (s11yy1 - 22554*s11cb1 - 46802*s11cr1) >> 8
+			s11bu := (s11yy1 + 116130*s11cb1) >> 8
+			if s11ru < 0 {
+				s11ru = 0
+			} else if s11ru > 0xffff {
+				s11ru = 0xffff
+			}
+			if s11gu < 0 {
+				s11gu = 0
+			} else if s11gu > 0xffff {
+				s11gu = 0xffff
+			}
+			if s11bu < 0 {
+				s11bu = 0
+			} else if s11bu > 0xffff {
+				s11bu = 0xffff
+			}
+
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_Image_Over(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00ru, s00gu, s00bu, s00au := src.At(sx0, sy0).RGBA()
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10ru, s10gu, s10bu, s10au := src.At(sx1, sy0).RGBA()
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01ru, s01gu, s01bu, s01au := src.At(sx0, sy1).RGBA()
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11ru, s11gu, s11bu, s11au := src.At(sx1, sy1).RGBA()
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			pa1 := (0xffff - pa) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) transform_RGBA_Image_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, opts *Options) {
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00ru, s00gu, s00bu, s00au := src.At(sx0, sy0).RGBA()
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10ru, s10gu, s10bu, s10au := src.At(sx1, sy0).RGBA()
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01ru, s01gu, s01bu, s01au := src.At(sx0, sy1).RGBA()
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11ru, s11gu, s11bu, s11au := src.At(sx1, sy1).RGBA()
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			dst.Pix[d+0] = uint8(pr >> 8)
+			dst.Pix[d+1] = uint8(pg >> 8)
+			dst.Pix[d+2] = uint8(pb >> 8)
+			dst.Pix[d+3] = uint8(pa >> 8)
+		}
+	}
+}
+
+func (ablInterpolator) transform_Image_Image_Over(dst Image, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, opts *Options) {
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00ru, s00gu, s00bu, s00au := src.At(sx0, sy0).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sx0, smp.Y+sy0).RGBA()
+				s00ru = s00ru * ma / 0xffff
+				s00gu = s00gu * ma / 0xffff
+				s00bu = s00bu * ma / 0xffff
+				s00au = s00au * ma / 0xffff
+			}
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10ru, s10gu, s10bu, s10au := src.At(sx1, sy0).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sx1, smp.Y+sy0).RGBA()
+				s10ru = s10ru * ma / 0xffff
+				s10gu = s10gu * ma / 0xffff
+				s10bu = s10bu * ma / 0xffff
+				s10au = s10au * ma / 0xffff
+			}
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01ru, s01gu, s01bu, s01au := src.At(sx0, sy1).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sx0, smp.Y+sy1).RGBA()
+				s01ru = s01ru * ma / 0xffff
+				s01gu = s01gu * ma / 0xffff
+				s01bu = s01bu * ma / 0xffff
+				s01au = s01au * ma / 0xffff
+			}
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11ru, s11gu, s11bu, s11au := src.At(sx1, sy1).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sx1, smp.Y+sy1).RGBA()
+				s11ru = s11ru * ma / 0xffff
+				s11gu = s11gu * ma / 0xffff
+				s11bu = s11bu * ma / 0xffff
+				s11au = s11au * ma / 0xffff
+			}
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+			if dstMask != nil {
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(dy)).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+			}
+			pa1 := 0xffff - pa
+			dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+			dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+			dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+			dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+			dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+		}
+	}
+}
+
+func (ablInterpolator) transform_Image_Image_Src(dst Image, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, opts *Options) {
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			sx -= 0.5
+			sx0 := int(sx)
+			xFrac0 := sx - float64(sx0)
+			xFrac1 := 1 - xFrac0
+			sx0 += bias.X
+			sx1 := sx0 + 1
+			if sx0 < sr.Min.X {
+				sx0, sx1 = sr.Min.X, sr.Min.X
+				xFrac0, xFrac1 = 0, 1
+			} else if sx1 >= sr.Max.X {
+				sx0, sx1 = sr.Max.X-1, sr.Max.X-1
+				xFrac0, xFrac1 = 1, 0
+			}
+
+			sy -= 0.5
+			sy0 := int(sy)
+			yFrac0 := sy - float64(sy0)
+			yFrac1 := 1 - yFrac0
+			sy0 += bias.Y
+			sy1 := sy0 + 1
+			if sy0 < sr.Min.Y {
+				sy0, sy1 = sr.Min.Y, sr.Min.Y
+				yFrac0, yFrac1 = 0, 1
+			} else if sy1 >= sr.Max.Y {
+				sy0, sy1 = sr.Max.Y-1, sr.Max.Y-1
+				yFrac0, yFrac1 = 1, 0
+			}
+
+			s00ru, s00gu, s00bu, s00au := src.At(sx0, sy0).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sx0, smp.Y+sy0).RGBA()
+				s00ru = s00ru * ma / 0xffff
+				s00gu = s00gu * ma / 0xffff
+				s00bu = s00bu * ma / 0xffff
+				s00au = s00au * ma / 0xffff
+			}
+			s00r := float64(s00ru)
+			s00g := float64(s00gu)
+			s00b := float64(s00bu)
+			s00a := float64(s00au)
+			s10ru, s10gu, s10bu, s10au := src.At(sx1, sy0).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sx1, smp.Y+sy0).RGBA()
+				s10ru = s10ru * ma / 0xffff
+				s10gu = s10gu * ma / 0xffff
+				s10bu = s10bu * ma / 0xffff
+				s10au = s10au * ma / 0xffff
+			}
+			s10r := float64(s10ru)
+			s10g := float64(s10gu)
+			s10b := float64(s10bu)
+			s10a := float64(s10au)
+			s10r = xFrac1*s00r + xFrac0*s10r
+			s10g = xFrac1*s00g + xFrac0*s10g
+			s10b = xFrac1*s00b + xFrac0*s10b
+			s10a = xFrac1*s00a + xFrac0*s10a
+			s01ru, s01gu, s01bu, s01au := src.At(sx0, sy1).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sx0, smp.Y+sy1).RGBA()
+				s01ru = s01ru * ma / 0xffff
+				s01gu = s01gu * ma / 0xffff
+				s01bu = s01bu * ma / 0xffff
+				s01au = s01au * ma / 0xffff
+			}
+			s01r := float64(s01ru)
+			s01g := float64(s01gu)
+			s01b := float64(s01bu)
+			s01a := float64(s01au)
+			s11ru, s11gu, s11bu, s11au := src.At(sx1, sy1).RGBA()
+			if srcMask != nil {
+				_, _, _, ma := srcMask.At(smp.X+sx1, smp.Y+sy1).RGBA()
+				s11ru = s11ru * ma / 0xffff
+				s11gu = s11gu * ma / 0xffff
+				s11bu = s11bu * ma / 0xffff
+				s11au = s11au * ma / 0xffff
+			}
+			s11r := float64(s11ru)
+			s11g := float64(s11gu)
+			s11b := float64(s11bu)
+			s11a := float64(s11au)
+			s11r = xFrac1*s01r + xFrac0*s11r
+			s11g = xFrac1*s01g + xFrac0*s11g
+			s11b = xFrac1*s01b + xFrac0*s11b
+			s11a = xFrac1*s01a + xFrac0*s11a
+			s11r = yFrac1*s10r + yFrac0*s11r
+			s11g = yFrac1*s10g + yFrac0*s11g
+			s11b = yFrac1*s10b + yFrac0*s11b
+			s11a = yFrac1*s10a + yFrac0*s11a
+			pr := uint32(s11r)
+			pg := uint32(s11g)
+			pb := uint32(s11b)
+			pa := uint32(s11a)
+			if dstMask != nil {
+				qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(dy)).RGBA()
+				pr = pr * ma / 0xffff
+				pg = pg * ma / 0xffff
+				pb = pb * ma / 0xffff
+				pa = pa * ma / 0xffff
+				pa1 := 0xffff - ma
+				dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+				dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+				dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+				dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+			} else {
+				dstColorRGBA64.R = uint16(pr)
+				dstColorRGBA64.G = uint16(pg)
+				dstColorRGBA64.B = uint16(pb)
+				dstColorRGBA64.A = uint16(pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+			}
+		}
+	}
+}
+
+func (z *kernelScaler) Scale(dst Image, dr image.Rectangle, src image.Image, sr image.Rectangle, op Op, opts *Options) {
+	if z.dw != int32(dr.Dx()) || z.dh != int32(dr.Dy()) || z.sw != int32(sr.Dx()) || z.sh != int32(sr.Dy()) {
+		z.kernel.Scale(dst, dr, src, sr, op, opts)
+		return
+	}
+
+	var o Options
+	if opts != nil {
+		o = *opts
+	}
+
+	// adr is the affected destination pixels.
+	adr := dst.Bounds().Intersect(dr)
+	adr, o.DstMask = clipAffectedDestRect(adr, o.DstMask, o.DstMaskP)
+	if adr.Empty() || sr.Empty() {
+		return
+	}
+	// Make adr relative to dr.Min.
+	adr = adr.Sub(dr.Min)
+	if op == Over && o.SrcMask == nil && opaque(src) {
+		op = Src
+	}
+
+	if _, ok := src.(*image.Uniform); ok && o.DstMask == nil && o.SrcMask == nil && sr.In(src.Bounds()) {
+		Draw(dst, dr, src, src.Bounds().Min, op)
+		return
+	}
+
+	// Create a temporary buffer:
+	// scaleX distributes the source image's columns over the temporary image.
+	// scaleY distributes the temporary image's rows over the destination image.
+	var tmp [][4]float64
+	if z.pool.New != nil {
+		tmpp := z.pool.Get().(*[][4]float64)
+		defer z.pool.Put(tmpp)
+		tmp = *tmpp
+	} else {
+		tmp = z.makeTmpBuf()
+	}
+
+	// sr is the source pixels. If it extends beyond the src bounds,
+	// we cannot use the type-specific fast paths, as they access
+	// the Pix fields directly without bounds checking.
+	//
+	// Similarly, the fast paths assume that the masks are nil.
+	if o.SrcMask != nil || !sr.In(src.Bounds()) {
+		z.scaleX_Image(tmp, src, sr, &o)
+	} else {
+		switch src := src.(type) {
+		case *image.Gray:
+			z.scaleX_Gray(tmp, src, sr, &o)
+		case *image.NRGBA:
+			z.scaleX_NRGBA(tmp, src, sr, &o)
+		case *image.RGBA:
+			z.scaleX_RGBA(tmp, src, sr, &o)
+		case *image.YCbCr:
+			switch src.SubsampleRatio {
+			default:
+				z.scaleX_Image(tmp, src, sr, &o)
+			case image.YCbCrSubsampleRatio444:
+				z.scaleX_YCbCr444(tmp, src, sr, &o)
+			case image.YCbCrSubsampleRatio422:
+				z.scaleX_YCbCr422(tmp, src, sr, &o)
+			case image.YCbCrSubsampleRatio420:
+				z.scaleX_YCbCr420(tmp, src, sr, &o)
+			case image.YCbCrSubsampleRatio440:
+				z.scaleX_YCbCr440(tmp, src, sr, &o)
+			}
+		default:
+			z.scaleX_Image(tmp, src, sr, &o)
+		}
+	}
+
+	if o.DstMask != nil {
+		switch op {
+		case Over:
+			z.scaleY_Image_Over(dst, dr, adr, tmp, &o)
+		case Src:
+			z.scaleY_Image_Src(dst, dr, adr, tmp, &o)
+		}
+	} else {
+		switch op {
+		case Over:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				z.scaleY_RGBA_Over(dst, dr, adr, tmp, &o)
+			default:
+				z.scaleY_Image_Over(dst, dr, adr, tmp, &o)
+			}
+		case Src:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				z.scaleY_RGBA_Src(dst, dr, adr, tmp, &o)
+			default:
+				z.scaleY_Image_Src(dst, dr, adr, tmp, &o)
+			}
+		}
+	}
+}
+
+func (q *Kernel) Transform(dst Image, s2d f64.Aff3, src image.Image, sr image.Rectangle, op Op, opts *Options) {
+	var o Options
+	if opts != nil {
+		o = *opts
+	}
+
+	dr := transformRect(&s2d, &sr)
+	// adr is the affected destination pixels.
+	adr := dst.Bounds().Intersect(dr)
+	adr, o.DstMask = clipAffectedDestRect(adr, o.DstMask, o.DstMaskP)
+	if adr.Empty() || sr.Empty() {
+		return
+	}
+	if op == Over && o.SrcMask == nil && opaque(src) {
+		op = Src
+	}
+	d2s := invert(&s2d)
+	// bias is a translation of the mapping from dst coordinates to src
+	// coordinates such that the latter temporarily have non-negative X
+	// and Y coordinates. This allows us to write int(f) instead of
+	// int(math.Floor(f)), since "round to zero" and "round down" are
+	// equivalent when f >= 0, but the former is much cheaper. The X--
+	// and Y-- are because the TransformLeaf methods have a "sx -= 0.5"
+	// adjustment.
+	bias := transformRect(&d2s, &adr).Min
+	bias.X--
+	bias.Y--
+	d2s[2] -= float64(bias.X)
+	d2s[5] -= float64(bias.Y)
+	// Make adr relative to dr.Min.
+	adr = adr.Sub(dr.Min)
+
+	if u, ok := src.(*image.Uniform); ok && o.DstMask != nil && o.SrcMask != nil && sr.In(src.Bounds()) {
+		transform_Uniform(dst, dr, adr, &d2s, u, sr, bias, op)
+		return
+	}
+
+	xscale := abs(d2s[0])
+	if s := abs(d2s[1]); xscale < s {
+		xscale = s
+	}
+	yscale := abs(d2s[3])
+	if s := abs(d2s[4]); yscale < s {
+		yscale = s
+	}
+
+	// sr is the source pixels. If it extends beyond the src bounds,
+	// we cannot use the type-specific fast paths, as they access
+	// the Pix fields directly without bounds checking.
+	//
+	// Similarly, the fast paths assume that the masks are nil.
+	if o.DstMask != nil || o.SrcMask != nil || !sr.In(src.Bounds()) {
+		switch op {
+		case Over:
+			q.transform_Image_Image_Over(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+		case Src:
+			q.transform_Image_Image_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+		}
+	} else {
+		switch op {
+		case Over:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				switch src := src.(type) {
+				case *image.NRGBA:
+					q.transform_RGBA_NRGBA_Over(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+				case *image.RGBA:
+					q.transform_RGBA_RGBA_Over(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+				default:
+					q.transform_RGBA_Image_Over(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+				}
+			default:
+				switch src := src.(type) {
+				default:
+					q.transform_Image_Image_Over(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+				}
+			}
+		case Src:
+			switch dst := dst.(type) {
+			case *image.RGBA:
+				switch src := src.(type) {
+				case *image.Gray:
+					q.transform_RGBA_Gray_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+				case *image.NRGBA:
+					q.transform_RGBA_NRGBA_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+				case *image.RGBA:
+					q.transform_RGBA_RGBA_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+				case *image.YCbCr:
+					switch src.SubsampleRatio {
+					default:
+						q.transform_RGBA_Image_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+					case image.YCbCrSubsampleRatio444:
+						q.transform_RGBA_YCbCr444_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+					case image.YCbCrSubsampleRatio422:
+						q.transform_RGBA_YCbCr422_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+					case image.YCbCrSubsampleRatio420:
+						q.transform_RGBA_YCbCr420_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+					case image.YCbCrSubsampleRatio440:
+						q.transform_RGBA_YCbCr440_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+					}
+				default:
+					q.transform_RGBA_Image_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+				}
+			default:
+				switch src := src.(type) {
+				default:
+					q.transform_Image_Image_Src(dst, dr, adr, &d2s, src, sr, bias, xscale, yscale, &o)
+				}
+			}
+		}
+	}
+}
+
+func (z *kernelScaler) scaleX_Gray(tmp [][4]float64, src *image.Gray, sr image.Rectangle, opts *Options) {
+	t := 0
+	for y := int32(0); y < z.sh; y++ {
+		for _, s := range z.horizontal.sources {
+			var pr float64
+			for _, c := range z.horizontal.contribs[s.i:s.j] {
+				pi := (sr.Min.Y+int(y)-src.Rect.Min.Y)*src.Stride + (sr.Min.X + int(c.coord) - src.Rect.Min.X)
+				pru := uint32(src.Pix[pi]) * 0x101
+				pr += float64(pru) * c.weight
+			}
+			pr *= s.invTotalWeightFFFF
+			tmp[t] = [4]float64{
+				pr,
+				pr,
+				pr,
+				1,
+			}
+			t++
+		}
+	}
+}
+
+func (z *kernelScaler) scaleX_NRGBA(tmp [][4]float64, src *image.NRGBA, sr image.Rectangle, opts *Options) {
+	t := 0
+	for y := int32(0); y < z.sh; y++ {
+		for _, s := range z.horizontal.sources {
+			var pr, pg, pb, pa float64
+			for _, c := range z.horizontal.contribs[s.i:s.j] {
+				pi := (sr.Min.Y+int(y)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(c.coord)-src.Rect.Min.X)*4
+				pau := uint32(src.Pix[pi+3]) * 0x101
+				pru := uint32(src.Pix[pi+0]) * pau / 0xff
+				pgu := uint32(src.Pix[pi+1]) * pau / 0xff
+				pbu := uint32(src.Pix[pi+2]) * pau / 0xff
+				pr += float64(pru) * c.weight
+				pg += float64(pgu) * c.weight
+				pb += float64(pbu) * c.weight
+				pa += float64(pau) * c.weight
+			}
+			tmp[t] = [4]float64{
+				pr * s.invTotalWeightFFFF,
+				pg * s.invTotalWeightFFFF,
+				pb * s.invTotalWeightFFFF,
+				pa * s.invTotalWeightFFFF,
+			}
+			t++
+		}
+	}
+}
+
+func (z *kernelScaler) scaleX_RGBA(tmp [][4]float64, src *image.RGBA, sr image.Rectangle, opts *Options) {
+	t := 0
+	for y := int32(0); y < z.sh; y++ {
+		for _, s := range z.horizontal.sources {
+			var pr, pg, pb, pa float64
+			for _, c := range z.horizontal.contribs[s.i:s.j] {
+				pi := (sr.Min.Y+int(y)-src.Rect.Min.Y)*src.Stride + (sr.Min.X+int(c.coord)-src.Rect.Min.X)*4
+				pru := uint32(src.Pix[pi+0]) * 0x101
+				pgu := uint32(src.Pix[pi+1]) * 0x101
+				pbu := uint32(src.Pix[pi+2]) * 0x101
+				pau := uint32(src.Pix[pi+3]) * 0x101
+				pr += float64(pru) * c.weight
+				pg += float64(pgu) * c.weight
+				pb += float64(pbu) * c.weight
+				pa += float64(pau) * c.weight
+			}
+			tmp[t] = [4]float64{
+				pr * s.invTotalWeightFFFF,
+				pg * s.invTotalWeightFFFF,
+				pb * s.invTotalWeightFFFF,
+				pa * s.invTotalWeightFFFF,
+			}
+			t++
+		}
+	}
+}
+
+func (z *kernelScaler) scaleX_YCbCr444(tmp [][4]float64, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	t := 0
+	for y := int32(0); y < z.sh; y++ {
+		for _, s := range z.horizontal.sources {
+			var pr, pg, pb float64
+			for _, c := range z.horizontal.contribs[s.i:s.j] {
+				pi := (sr.Min.Y+int(y)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(c.coord) - src.Rect.Min.X)
+				pj := (sr.Min.Y+int(y)-src.Rect.Min.Y)*src.CStride + (sr.Min.X + int(c.coord) - src.Rect.Min.X)
+
+				// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+				pyy1 := int(src.Y[pi]) * 0x10101
+				pcb1 := int(src.Cb[pj]) - 128
+				pcr1 := int(src.Cr[pj]) - 128
+				pru := (pyy1 + 91881*pcr1) >> 8
+				pgu := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+				pbu := (pyy1 + 116130*pcb1) >> 8
+				if pru < 0 {
+					pru = 0
+				} else if pru > 0xffff {
+					pru = 0xffff
+				}
+				if pgu < 0 {
+					pgu = 0
+				} else if pgu > 0xffff {
+					pgu = 0xffff
+				}
+				if pbu < 0 {
+					pbu = 0
+				} else if pbu > 0xffff {
+					pbu = 0xffff
+				}
+
+				pr += float64(pru) * c.weight
+				pg += float64(pgu) * c.weight
+				pb += float64(pbu) * c.weight
+			}
+			tmp[t] = [4]float64{
+				pr * s.invTotalWeightFFFF,
+				pg * s.invTotalWeightFFFF,
+				pb * s.invTotalWeightFFFF,
+				1,
+			}
+			t++
+		}
+	}
+}
+
+func (z *kernelScaler) scaleX_YCbCr422(tmp [][4]float64, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	t := 0
+	for y := int32(0); y < z.sh; y++ {
+		for _, s := range z.horizontal.sources {
+			var pr, pg, pb float64
+			for _, c := range z.horizontal.contribs[s.i:s.j] {
+				pi := (sr.Min.Y+int(y)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(c.coord) - src.Rect.Min.X)
+				pj := (sr.Min.Y+int(y)-src.Rect.Min.Y)*src.CStride + ((sr.Min.X+int(c.coord))/2 - src.Rect.Min.X/2)
+
+				// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+				pyy1 := int(src.Y[pi]) * 0x10101
+				pcb1 := int(src.Cb[pj]) - 128
+				pcr1 := int(src.Cr[pj]) - 128
+				pru := (pyy1 + 91881*pcr1) >> 8
+				pgu := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+				pbu := (pyy1 + 116130*pcb1) >> 8
+				if pru < 0 {
+					pru = 0
+				} else if pru > 0xffff {
+					pru = 0xffff
+				}
+				if pgu < 0 {
+					pgu = 0
+				} else if pgu > 0xffff {
+					pgu = 0xffff
+				}
+				if pbu < 0 {
+					pbu = 0
+				} else if pbu > 0xffff {
+					pbu = 0xffff
+				}
+
+				pr += float64(pru) * c.weight
+				pg += float64(pgu) * c.weight
+				pb += float64(pbu) * c.weight
+			}
+			tmp[t] = [4]float64{
+				pr * s.invTotalWeightFFFF,
+				pg * s.invTotalWeightFFFF,
+				pb * s.invTotalWeightFFFF,
+				1,
+			}
+			t++
+		}
+	}
+}
+
+func (z *kernelScaler) scaleX_YCbCr420(tmp [][4]float64, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	t := 0
+	for y := int32(0); y < z.sh; y++ {
+		for _, s := range z.horizontal.sources {
+			var pr, pg, pb float64
+			for _, c := range z.horizontal.contribs[s.i:s.j] {
+				pi := (sr.Min.Y+int(y)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(c.coord) - src.Rect.Min.X)
+				pj := ((sr.Min.Y+int(y))/2-src.Rect.Min.Y/2)*src.CStride + ((sr.Min.X+int(c.coord))/2 - src.Rect.Min.X/2)
+
+				// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+				pyy1 := int(src.Y[pi]) * 0x10101
+				pcb1 := int(src.Cb[pj]) - 128
+				pcr1 := int(src.Cr[pj]) - 128
+				pru := (pyy1 + 91881*pcr1) >> 8
+				pgu := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+				pbu := (pyy1 + 116130*pcb1) >> 8
+				if pru < 0 {
+					pru = 0
+				} else if pru > 0xffff {
+					pru = 0xffff
+				}
+				if pgu < 0 {
+					pgu = 0
+				} else if pgu > 0xffff {
+					pgu = 0xffff
+				}
+				if pbu < 0 {
+					pbu = 0
+				} else if pbu > 0xffff {
+					pbu = 0xffff
+				}
+
+				pr += float64(pru) * c.weight
+				pg += float64(pgu) * c.weight
+				pb += float64(pbu) * c.weight
+			}
+			tmp[t] = [4]float64{
+				pr * s.invTotalWeightFFFF,
+				pg * s.invTotalWeightFFFF,
+				pb * s.invTotalWeightFFFF,
+				1,
+			}
+			t++
+		}
+	}
+}
+
+func (z *kernelScaler) scaleX_YCbCr440(tmp [][4]float64, src *image.YCbCr, sr image.Rectangle, opts *Options) {
+	t := 0
+	for y := int32(0); y < z.sh; y++ {
+		for _, s := range z.horizontal.sources {
+			var pr, pg, pb float64
+			for _, c := range z.horizontal.contribs[s.i:s.j] {
+				pi := (sr.Min.Y+int(y)-src.Rect.Min.Y)*src.YStride + (sr.Min.X + int(c.coord) - src.Rect.Min.X)
+				pj := ((sr.Min.Y+int(y))/2-src.Rect.Min.Y/2)*src.CStride + (sr.Min.X + int(c.coord) - src.Rect.Min.X)
+
+				// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+				pyy1 := int(src.Y[pi]) * 0x10101
+				pcb1 := int(src.Cb[pj]) - 128
+				pcr1 := int(src.Cr[pj]) - 128
+				pru := (pyy1 + 91881*pcr1) >> 8
+				pgu := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+				pbu := (pyy1 + 116130*pcb1) >> 8
+				if pru < 0 {
+					pru = 0
+				} else if pru > 0xffff {
+					pru = 0xffff
+				}
+				if pgu < 0 {
+					pgu = 0
+				} else if pgu > 0xffff {
+					pgu = 0xffff
+				}
+				if pbu < 0 {
+					pbu = 0
+				} else if pbu > 0xffff {
+					pbu = 0xffff
+				}
+
+				pr += float64(pru) * c.weight
+				pg += float64(pgu) * c.weight
+				pb += float64(pbu) * c.weight
+			}
+			tmp[t] = [4]float64{
+				pr * s.invTotalWeightFFFF,
+				pg * s.invTotalWeightFFFF,
+				pb * s.invTotalWeightFFFF,
+				1,
+			}
+			t++
+		}
+	}
+}
+
+func (z *kernelScaler) scaleX_Image(tmp [][4]float64, src image.Image, sr image.Rectangle, opts *Options) {
+	t := 0
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	for y := int32(0); y < z.sh; y++ {
+		for _, s := range z.horizontal.sources {
+			var pr, pg, pb, pa float64
+			for _, c := range z.horizontal.contribs[s.i:s.j] {
+				pru, pgu, pbu, pau := src.At(sr.Min.X+int(c.coord), sr.Min.Y+int(y)).RGBA()
+				if srcMask != nil {
+					_, _, _, ma := srcMask.At(smp.X+sr.Min.X+int(c.coord), smp.Y+sr.Min.Y+int(y)).RGBA()
+					pru = pru * ma / 0xffff
+					pgu = pgu * ma / 0xffff
+					pbu = pbu * ma / 0xffff
+					pau = pau * ma / 0xffff
+				}
+				pr += float64(pru) * c.weight
+				pg += float64(pgu) * c.weight
+				pb += float64(pbu) * c.weight
+				pa += float64(pau) * c.weight
+			}
+			tmp[t] = [4]float64{
+				pr * s.invTotalWeightFFFF,
+				pg * s.invTotalWeightFFFF,
+				pb * s.invTotalWeightFFFF,
+				pa * s.invTotalWeightFFFF,
+			}
+			t++
+		}
+	}
+}
+
+func (z *kernelScaler) scaleY_RGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, tmp [][4]float64, opts *Options) {
+	for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+		d := (dr.Min.Y+adr.Min.Y-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+int(dx)-dst.Rect.Min.X)*4
+		for _, s := range z.vertical.sources[adr.Min.Y:adr.Max.Y] {
+			var pr, pg, pb, pa float64
+			for _, c := range z.vertical.contribs[s.i:s.j] {
+				p := &tmp[c.coord*z.dw+dx]
+				pr += p[0] * c.weight
+				pg += p[1] * c.weight
+				pb += p[2] * c.weight
+				pa += p[3] * c.weight
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			pr0 := uint32(ftou(pr * s.invTotalWeight))
+			pg0 := uint32(ftou(pg * s.invTotalWeight))
+			pb0 := uint32(ftou(pb * s.invTotalWeight))
+			pa0 := uint32(ftou(pa * s.invTotalWeight))
+			pa1 := (0xffff - uint32(pa0)) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr0) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg0) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb0) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa0) >> 8)
+			d += dst.Stride
+		}
+	}
+}
+
+func (z *kernelScaler) scaleY_RGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, tmp [][4]float64, opts *Options) {
+	for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+		d := (dr.Min.Y+adr.Min.Y-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+int(dx)-dst.Rect.Min.X)*4
+		for _, s := range z.vertical.sources[adr.Min.Y:adr.Max.Y] {
+			var pr, pg, pb, pa float64
+			for _, c := range z.vertical.contribs[s.i:s.j] {
+				p := &tmp[c.coord*z.dw+dx]
+				pr += p[0] * c.weight
+				pg += p[1] * c.weight
+				pb += p[2] * c.weight
+				pa += p[3] * c.weight
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			dst.Pix[d+0] = uint8(ftou(pr*s.invTotalWeight) >> 8)
+			dst.Pix[d+1] = uint8(ftou(pg*s.invTotalWeight) >> 8)
+			dst.Pix[d+2] = uint8(ftou(pb*s.invTotalWeight) >> 8)
+			dst.Pix[d+3] = uint8(ftou(pa*s.invTotalWeight) >> 8)
+			d += dst.Stride
+		}
+	}
+}
+
+func (z *kernelScaler) scaleY_Image_Over(dst Image, dr, adr image.Rectangle, tmp [][4]float64, opts *Options) {
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+	for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+		for dy, s := range z.vertical.sources[adr.Min.Y:adr.Max.Y] {
+			var pr, pg, pb, pa float64
+			for _, c := range z.vertical.contribs[s.i:s.j] {
+				p := &tmp[c.coord*z.dw+dx]
+				pr += p[0] * c.weight
+				pg += p[1] * c.weight
+				pb += p[2] * c.weight
+				pa += p[3] * c.weight
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(adr.Min.Y+dy)).RGBA()
+			pr0 := uint32(ftou(pr * s.invTotalWeight))
+			pg0 := uint32(ftou(pg * s.invTotalWeight))
+			pb0 := uint32(ftou(pb * s.invTotalWeight))
+			pa0 := uint32(ftou(pa * s.invTotalWeight))
+			if dstMask != nil {
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(adr.Min.Y+dy)).RGBA()
+				pr0 = pr0 * ma / 0xffff
+				pg0 = pg0 * ma / 0xffff
+				pb0 = pb0 * ma / 0xffff
+				pa0 = pa0 * ma / 0xffff
+			}
+			pa1 := 0xffff - pa0
+			dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr0)
+			dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg0)
+			dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb0)
+			dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa0)
+			dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(adr.Min.Y+dy), dstColor)
+		}
+	}
+}
+
+func (z *kernelScaler) scaleY_Image_Src(dst Image, dr, adr image.Rectangle, tmp [][4]float64, opts *Options) {
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+	for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+		for dy, s := range z.vertical.sources[adr.Min.Y:adr.Max.Y] {
+			var pr, pg, pb, pa float64
+			for _, c := range z.vertical.contribs[s.i:s.j] {
+				p := &tmp[c.coord*z.dw+dx]
+				pr += p[0] * c.weight
+				pg += p[1] * c.weight
+				pb += p[2] * c.weight
+				pa += p[3] * c.weight
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			if dstMask != nil {
+				qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(adr.Min.Y+dy)).RGBA()
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(adr.Min.Y+dy)).RGBA()
+				pr := uint32(ftou(pr*s.invTotalWeight)) * ma / 0xffff
+				pg := uint32(ftou(pg*s.invTotalWeight)) * ma / 0xffff
+				pb := uint32(ftou(pb*s.invTotalWeight)) * ma / 0xffff
+				pa := uint32(ftou(pa*s.invTotalWeight)) * ma / 0xffff
+				pa1 := 0xffff - ma
+				dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+				dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+				dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+				dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(adr.Min.Y+dy), dstColor)
+			} else {
+				dstColorRGBA64.R = ftou(pr * s.invTotalWeight)
+				dstColorRGBA64.G = ftou(pg * s.invTotalWeight)
+				dstColorRGBA64.B = ftou(pb * s.invTotalWeight)
+				dstColorRGBA64.A = ftou(pa * s.invTotalWeight)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(adr.Min.Y+dy), dstColor)
+			}
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_Gray_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.Gray, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pi := (ky-src.Rect.Min.Y)*src.Stride + (kx - src.Rect.Min.X)
+							pru := uint32(src.Pix[pi]) * 0x101
+							pr += float64(pru) * w
+						}
+					}
+				}
+			}
+			out := uint8(fffftou(pr) >> 8)
+			dst.Pix[d+0] = out
+			dst.Pix[d+1] = out
+			dst.Pix[d+2] = out
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_NRGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.NRGBA, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb, pa float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pi := (ky-src.Rect.Min.Y)*src.Stride + (kx-src.Rect.Min.X)*4
+							pau := uint32(src.Pix[pi+3]) * 0x101
+							pru := uint32(src.Pix[pi+0]) * pau / 0xff
+							pgu := uint32(src.Pix[pi+1]) * pau / 0xff
+							pbu := uint32(src.Pix[pi+2]) * pau / 0xff
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+							pa += float64(pau) * w
+						}
+					}
+				}
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			pr0 := uint32(fffftou(pr))
+			pg0 := uint32(fffftou(pg))
+			pb0 := uint32(fffftou(pb))
+			pa0 := uint32(fffftou(pa))
+			pa1 := (0xffff - uint32(pa0)) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr0) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg0) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb0) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa0) >> 8)
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_NRGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.NRGBA, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb, pa float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pi := (ky-src.Rect.Min.Y)*src.Stride + (kx-src.Rect.Min.X)*4
+							pau := uint32(src.Pix[pi+3]) * 0x101
+							pru := uint32(src.Pix[pi+0]) * pau / 0xff
+							pgu := uint32(src.Pix[pi+1]) * pau / 0xff
+							pbu := uint32(src.Pix[pi+2]) * pau / 0xff
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+							pa += float64(pau) * w
+						}
+					}
+				}
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			dst.Pix[d+0] = uint8(fffftou(pr) >> 8)
+			dst.Pix[d+1] = uint8(fffftou(pg) >> 8)
+			dst.Pix[d+2] = uint8(fffftou(pb) >> 8)
+			dst.Pix[d+3] = uint8(fffftou(pa) >> 8)
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_RGBA_Over(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.RGBA, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb, pa float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pi := (ky-src.Rect.Min.Y)*src.Stride + (kx-src.Rect.Min.X)*4
+							pru := uint32(src.Pix[pi+0]) * 0x101
+							pgu := uint32(src.Pix[pi+1]) * 0x101
+							pbu := uint32(src.Pix[pi+2]) * 0x101
+							pau := uint32(src.Pix[pi+3]) * 0x101
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+							pa += float64(pau) * w
+						}
+					}
+				}
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			pr0 := uint32(fffftou(pr))
+			pg0 := uint32(fffftou(pg))
+			pb0 := uint32(fffftou(pb))
+			pa0 := uint32(fffftou(pa))
+			pa1 := (0xffff - uint32(pa0)) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr0) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg0) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb0) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa0) >> 8)
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_RGBA_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.RGBA, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb, pa float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pi := (ky-src.Rect.Min.Y)*src.Stride + (kx-src.Rect.Min.X)*4
+							pru := uint32(src.Pix[pi+0]) * 0x101
+							pgu := uint32(src.Pix[pi+1]) * 0x101
+							pbu := uint32(src.Pix[pi+2]) * 0x101
+							pau := uint32(src.Pix[pi+3]) * 0x101
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+							pa += float64(pau) * w
+						}
+					}
+				}
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			dst.Pix[d+0] = uint8(fffftou(pr) >> 8)
+			dst.Pix[d+1] = uint8(fffftou(pg) >> 8)
+			dst.Pix[d+2] = uint8(fffftou(pb) >> 8)
+			dst.Pix[d+3] = uint8(fffftou(pa) >> 8)
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_YCbCr444_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pi := (ky-src.Rect.Min.Y)*src.YStride + (kx - src.Rect.Min.X)
+							pj := (ky-src.Rect.Min.Y)*src.CStride + (kx - src.Rect.Min.X)
+
+							// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+							pyy1 := int(src.Y[pi]) * 0x10101
+							pcb1 := int(src.Cb[pj]) - 128
+							pcr1 := int(src.Cr[pj]) - 128
+							pru := (pyy1 + 91881*pcr1) >> 8
+							pgu := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+							pbu := (pyy1 + 116130*pcb1) >> 8
+							if pru < 0 {
+								pru = 0
+							} else if pru > 0xffff {
+								pru = 0xffff
+							}
+							if pgu < 0 {
+								pgu = 0
+							} else if pgu > 0xffff {
+								pgu = 0xffff
+							}
+							if pbu < 0 {
+								pbu = 0
+							} else if pbu > 0xffff {
+								pbu = 0xffff
+							}
+
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+						}
+					}
+				}
+			}
+			dst.Pix[d+0] = uint8(fffftou(pr) >> 8)
+			dst.Pix[d+1] = uint8(fffftou(pg) >> 8)
+			dst.Pix[d+2] = uint8(fffftou(pb) >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_YCbCr422_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pi := (ky-src.Rect.Min.Y)*src.YStride + (kx - src.Rect.Min.X)
+							pj := (ky-src.Rect.Min.Y)*src.CStride + ((kx)/2 - src.Rect.Min.X/2)
+
+							// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+							pyy1 := int(src.Y[pi]) * 0x10101
+							pcb1 := int(src.Cb[pj]) - 128
+							pcr1 := int(src.Cr[pj]) - 128
+							pru := (pyy1 + 91881*pcr1) >> 8
+							pgu := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+							pbu := (pyy1 + 116130*pcb1) >> 8
+							if pru < 0 {
+								pru = 0
+							} else if pru > 0xffff {
+								pru = 0xffff
+							}
+							if pgu < 0 {
+								pgu = 0
+							} else if pgu > 0xffff {
+								pgu = 0xffff
+							}
+							if pbu < 0 {
+								pbu = 0
+							} else if pbu > 0xffff {
+								pbu = 0xffff
+							}
+
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+						}
+					}
+				}
+			}
+			dst.Pix[d+0] = uint8(fffftou(pr) >> 8)
+			dst.Pix[d+1] = uint8(fffftou(pg) >> 8)
+			dst.Pix[d+2] = uint8(fffftou(pb) >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_YCbCr420_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pi := (ky-src.Rect.Min.Y)*src.YStride + (kx - src.Rect.Min.X)
+							pj := ((ky)/2-src.Rect.Min.Y/2)*src.CStride + ((kx)/2 - src.Rect.Min.X/2)
+
+							// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+							pyy1 := int(src.Y[pi]) * 0x10101
+							pcb1 := int(src.Cb[pj]) - 128
+							pcr1 := int(src.Cr[pj]) - 128
+							pru := (pyy1 + 91881*pcr1) >> 8
+							pgu := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+							pbu := (pyy1 + 116130*pcb1) >> 8
+							if pru < 0 {
+								pru = 0
+							} else if pru > 0xffff {
+								pru = 0xffff
+							}
+							if pgu < 0 {
+								pgu = 0
+							} else if pgu > 0xffff {
+								pgu = 0xffff
+							}
+							if pbu < 0 {
+								pbu = 0
+							} else if pbu > 0xffff {
+								pbu = 0xffff
+							}
+
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+						}
+					}
+				}
+			}
+			dst.Pix[d+0] = uint8(fffftou(pr) >> 8)
+			dst.Pix[d+1] = uint8(fffftou(pg) >> 8)
+			dst.Pix[d+2] = uint8(fffftou(pb) >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_YCbCr440_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.YCbCr, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pi := (ky-src.Rect.Min.Y)*src.YStride + (kx - src.Rect.Min.X)
+							pj := ((ky)/2-src.Rect.Min.Y/2)*src.CStride + (kx - src.Rect.Min.X)
+
+							// This is an inline version of image/color/ycbcr.go's YCbCr.RGBA method.
+							pyy1 := int(src.Y[pi]) * 0x10101
+							pcb1 := int(src.Cb[pj]) - 128
+							pcr1 := int(src.Cr[pj]) - 128
+							pru := (pyy1 + 91881*pcr1) >> 8
+							pgu := (pyy1 - 22554*pcb1 - 46802*pcr1) >> 8
+							pbu := (pyy1 + 116130*pcb1) >> 8
+							if pru < 0 {
+								pru = 0
+							} else if pru > 0xffff {
+								pru = 0xffff
+							}
+							if pgu < 0 {
+								pgu = 0
+							} else if pgu > 0xffff {
+								pgu = 0xffff
+							}
+							if pbu < 0 {
+								pbu = 0
+							} else if pbu > 0xffff {
+								pbu = 0xffff
+							}
+
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+						}
+					}
+				}
+			}
+			dst.Pix[d+0] = uint8(fffftou(pr) >> 8)
+			dst.Pix[d+1] = uint8(fffftou(pg) >> 8)
+			dst.Pix[d+2] = uint8(fffftou(pb) >> 8)
+			dst.Pix[d+3] = 0xff
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_Image_Over(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb, pa float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pru, pgu, pbu, pau := src.At(kx, ky).RGBA()
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+							pa += float64(pau) * w
+						}
+					}
+				}
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			pr0 := uint32(fffftou(pr))
+			pg0 := uint32(fffftou(pg))
+			pb0 := uint32(fffftou(pb))
+			pa0 := uint32(fffftou(pa))
+			pa1 := (0xffff - uint32(pa0)) * 0x101
+			dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr0) >> 8)
+			dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg0) >> 8)
+			dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb0) >> 8)
+			dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa0) >> 8)
+		}
+	}
+}
+
+func (q *Kernel) transform_RGBA_Image_Src(dst *image.RGBA, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		d := (dr.Min.Y+int(dy)-dst.Rect.Min.Y)*dst.Stride + (dr.Min.X+adr.Min.X-dst.Rect.Min.X)*4
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb, pa float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pru, pgu, pbu, pau := src.At(kx, ky).RGBA()
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+							pa += float64(pau) * w
+						}
+					}
+				}
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			dst.Pix[d+0] = uint8(fffftou(pr) >> 8)
+			dst.Pix[d+1] = uint8(fffftou(pg) >> 8)
+			dst.Pix[d+2] = uint8(fffftou(pb) >> 8)
+			dst.Pix[d+3] = uint8(fffftou(pa) >> 8)
+		}
+	}
+}
+
+func (q *Kernel) transform_Image_Image_Over(dst Image, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb, pa float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pru, pgu, pbu, pau := src.At(kx, ky).RGBA()
+							if srcMask != nil {
+								_, _, _, ma := srcMask.At(smp.X+kx, smp.Y+ky).RGBA()
+								pru = pru * ma / 0xffff
+								pgu = pgu * ma / 0xffff
+								pbu = pbu * ma / 0xffff
+								pau = pau * ma / 0xffff
+							}
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+							pa += float64(pau) * w
+						}
+					}
+				}
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+			pr0 := uint32(fffftou(pr))
+			pg0 := uint32(fffftou(pg))
+			pb0 := uint32(fffftou(pb))
+			pa0 := uint32(fffftou(pa))
+			if dstMask != nil {
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(dy)).RGBA()
+				pr0 = pr0 * ma / 0xffff
+				pg0 = pg0 * ma / 0xffff
+				pb0 = pb0 * ma / 0xffff
+				pa0 = pa0 * ma / 0xffff
+			}
+			pa1 := 0xffff - pa0
+			dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr0)
+			dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg0)
+			dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb0)
+			dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa0)
+			dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+		}
+	}
+}
+
+func (q *Kernel) transform_Image_Image_Src(dst Image, dr, adr image.Rectangle, d2s *f64.Aff3, src image.Image, sr image.Rectangle, bias image.Point, xscale, yscale float64, opts *Options) {
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	xHalfWidth, xKernelArgScale := q.Support, 1.0
+	if xscale > 1 {
+		xHalfWidth *= xscale
+		xKernelArgScale = 1 / xscale
+	}
+	yHalfWidth, yKernelArgScale := q.Support, 1.0
+	if yscale > 1 {
+		yHalfWidth *= yscale
+		yKernelArgScale = 1 / yscale
+	}
+
+	xWeights := make([]float64, 1+2*int(math.Ceil(xHalfWidth)))
+	yWeights := make([]float64, 1+2*int(math.Ceil(yHalfWidth)))
+
+	srcMask, smp := opts.SrcMask, opts.SrcMaskP
+	dstMask, dmp := opts.DstMask, opts.DstMaskP
+	dstColorRGBA64 := &color.RGBA64{}
+	dstColor := color.Color(dstColorRGBA64)
+	for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+		dyf := float64(dr.Min.Y+int(dy)) + 0.5
+		for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+			dxf := float64(dr.Min.X+int(dx)) + 0.5
+			sx := d2s[0]*dxf + d2s[1]*dyf + d2s[2]
+			sy := d2s[3]*dxf + d2s[4]*dyf + d2s[5]
+			if !(image.Point{int(sx) + bias.X, int(sy) + bias.Y}).In(sr) {
+				continue
+			}
+
+			// TODO: adjust the bias so that we can use int(f) instead
+			// of math.Floor(f) and math.Ceil(f).
+			sx += float64(bias.X)
+			sx -= 0.5
+			ix := int(math.Floor(sx - xHalfWidth))
+			if ix < sr.Min.X {
+				ix = sr.Min.X
+			}
+			jx := int(math.Ceil(sx + xHalfWidth))
+			if jx > sr.Max.X {
+				jx = sr.Max.X
+			}
+
+			totalXWeight := 0.0
+			for kx := ix; kx < jx; kx++ {
+				xWeight := 0.0
+				if t := abs((sx - float64(kx)) * xKernelArgScale); t < q.Support {
+					xWeight = q.At(t)
+				}
+				xWeights[kx-ix] = xWeight
+				totalXWeight += xWeight
+			}
+			for x := range xWeights[:jx-ix] {
+				xWeights[x] /= totalXWeight
+			}
+
+			sy += float64(bias.Y)
+			sy -= 0.5
+			iy := int(math.Floor(sy - yHalfWidth))
+			if iy < sr.Min.Y {
+				iy = sr.Min.Y
+			}
+			jy := int(math.Ceil(sy + yHalfWidth))
+			if jy > sr.Max.Y {
+				jy = sr.Max.Y
+			}
+
+			totalYWeight := 0.0
+			for ky := iy; ky < jy; ky++ {
+				yWeight := 0.0
+				if t := abs((sy - float64(ky)) * yKernelArgScale); t < q.Support {
+					yWeight = q.At(t)
+				}
+				yWeights[ky-iy] = yWeight
+				totalYWeight += yWeight
+			}
+			for y := range yWeights[:jy-iy] {
+				yWeights[y] /= totalYWeight
+			}
+
+			var pr, pg, pb, pa float64
+			for ky := iy; ky < jy; ky++ {
+				if yWeight := yWeights[ky-iy]; yWeight != 0 {
+					for kx := ix; kx < jx; kx++ {
+						if w := xWeights[kx-ix] * yWeight; w != 0 {
+							pru, pgu, pbu, pau := src.At(kx, ky).RGBA()
+							if srcMask != nil {
+								_, _, _, ma := srcMask.At(smp.X+kx, smp.Y+ky).RGBA()
+								pru = pru * ma / 0xffff
+								pgu = pgu * ma / 0xffff
+								pbu = pbu * ma / 0xffff
+								pau = pau * ma / 0xffff
+							}
+							pr += float64(pru) * w
+							pg += float64(pgu) * w
+							pb += float64(pbu) * w
+							pa += float64(pau) * w
+						}
+					}
+				}
+			}
+
+			if pr > pa {
+				pr = pa
+			}
+			if pg > pa {
+				pg = pa
+			}
+			if pb > pa {
+				pb = pa
+			}
+
+			if dstMask != nil {
+				qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+				_, _, _, ma := dstMask.At(dmp.X+dr.Min.X+int(dx), dmp.Y+dr.Min.Y+int(dy)).RGBA()
+				pr := uint32(fffftou(pr)) * ma / 0xffff
+				pg := uint32(fffftou(pg)) * ma / 0xffff
+				pb := uint32(fffftou(pb)) * ma / 0xffff
+				pa := uint32(fffftou(pa)) * ma / 0xffff
+				pa1 := 0xffff - ma
+				dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+				dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+				dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+				dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+			} else {
+				dstColorRGBA64.R = fffftou(pr)
+				dstColorRGBA64.G = fffftou(pg)
+				dstColorRGBA64.B = fffftou(pb)
+				dstColorRGBA64.A = fffftou(pa)
+				dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+			}
+		}
+	}
+}
diff --git a/server/vendor/golang.org/x/image/draw/scale.go b/server/vendor/golang.org/x/image/draw/scale.go
new file mode 100644
index 000000000..00121a129
--- /dev/null
+++ b/server/vendor/golang.org/x/image/draw/scale.go
@@ -0,0 +1,525 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:generate go run gen.go
+
+package draw
+
+import (
+	"image"
+	"image/color"
+	"math"
+	"sync"
+
+	"golang.org/x/image/math/f64"
+)
+
+// Copy copies the part of the source image defined by src and sr and writes
+// the result of a Porter-Duff composition to the part of the destination image
+// defined by dst and the translation of sr so that sr.Min translates to dp.
+func Copy(dst Image, dp image.Point, src image.Image, sr image.Rectangle, op Op, opts *Options) {
+	var o Options
+	if opts != nil {
+		o = *opts
+	}
+	dr := sr.Add(dp.Sub(sr.Min))
+	if o.DstMask == nil {
+		DrawMask(dst, dr, src, sr.Min, o.SrcMask, o.SrcMaskP.Add(sr.Min), op)
+	} else {
+		NearestNeighbor.Scale(dst, dr, src, sr, op, opts)
+	}
+}
+
+// Scaler scales the part of the source image defined by src and sr and writes
+// the result of a Porter-Duff composition to the part of the destination image
+// defined by dst and dr.
+//
+// A Scaler is safe to use concurrently.
+type Scaler interface {
+	Scale(dst Image, dr image.Rectangle, src image.Image, sr image.Rectangle, op Op, opts *Options)
+}
+
+// Transformer transforms the part of the source image defined by src and sr
+// and writes the result of a Porter-Duff composition to the part of the
+// destination image defined by dst and the affine transform m applied to sr.
+//
+// For example, if m is the matrix
+//
+// 	m00 m01 m02
+// 	m10 m11 m12
+//
+// then the src-space point (sx, sy) maps to the dst-space point
+// (m00*sx + m01*sy + m02, m10*sx + m11*sy + m12).
+//
+// A Transformer is safe to use concurrently.
+type Transformer interface {
+	Transform(dst Image, m f64.Aff3, src image.Image, sr image.Rectangle, op Op, opts *Options)
+}
+
+// Options are optional parameters to Copy, Scale and Transform.
+//
+// A nil *Options means to use the default (zero) values of each field.
+type Options struct {
+	// Masks limit what parts of the dst image are drawn to and what parts of
+	// the src image are drawn from.
+	//
+	// A dst or src mask image having a zero alpha (transparent) pixel value in
+	// the respective coordinate space means that dst pixel is entirely
+	// unaffected or that src pixel is considered transparent black. A full
+	// alpha (opaque) value means that the dst pixel is maximally affected or
+	// the src pixel contributes maximally. The default values, nil, are
+	// equivalent to fully opaque, infinitely large mask images.
+	//
+	// The DstMask is otherwise known as a clip mask, and its pixels map 1:1 to
+	// the dst image's pixels. DstMaskP in DstMask space corresponds to
+	// image.Point{X:0, Y:0} in dst space. For example, when limiting
+	// repainting to a 'dirty rectangle', use that image.Rectangle and a zero
+	// image.Point as the DstMask and DstMaskP.
+	//
+	// The SrcMask's pixels map 1:1 to the src image's pixels. SrcMaskP in
+	// SrcMask space corresponds to image.Point{X:0, Y:0} in src space. For
+	// example, when drawing font glyphs in a uniform color, use an
+	// *image.Uniform as the src, and use the glyph atlas image and the
+	// per-glyph offset as SrcMask and SrcMaskP:
+	//	Copy(dst, dp, image.NewUniform(color), image.Rect(0, 0, glyphWidth, glyphHeight), &Options{
+	//		SrcMask:  glyphAtlas,
+	//		SrcMaskP: glyphOffset,
+	//	})
+	DstMask  image.Image
+	DstMaskP image.Point
+	SrcMask  image.Image
+	SrcMaskP image.Point
+
+	// TODO: a smooth vs sharp edges option, for arbitrary rotations?
+}
+
+// Interpolator is an interpolation algorithm, when dst and src pixels don't
+// have a 1:1 correspondence.
+//
+// Of the interpolators provided by this package:
+//	- NearestNeighbor is fast but usually looks worst.
+//	- CatmullRom is slow but usually looks best.
+//	- ApproxBiLinear has reasonable speed and quality.
+//
+// The time taken depends on the size of dr. For kernel interpolators, the
+// speed also depends on the size of sr, and so are often slower than
+// non-kernel interpolators, especially when scaling down.
+type Interpolator interface {
+	Scaler
+	Transformer
+}
+
+// Kernel is an interpolator that blends source pixels weighted by a symmetric
+// kernel function.
+type Kernel struct {
+	// Support is the kernel support and must be >= 0. At(t) is assumed to be
+	// zero when t >= Support.
+	Support float64
+	// At is the kernel function. It will only be called with t in the
+	// range [0, Support).
+	At func(t float64) float64
+}
+
+// Scale implements the Scaler interface.
+func (q *Kernel) Scale(dst Image, dr image.Rectangle, src image.Image, sr image.Rectangle, op Op, opts *Options) {
+	q.newScaler(dr.Dx(), dr.Dy(), sr.Dx(), sr.Dy(), false).Scale(dst, dr, src, sr, op, opts)
+}
+
+// NewScaler returns a Scaler that is optimized for scaling multiple times with
+// the same fixed destination and source width and height.
+func (q *Kernel) NewScaler(dw, dh, sw, sh int) Scaler {
+	return q.newScaler(dw, dh, sw, sh, true)
+}
+
+func (q *Kernel) newScaler(dw, dh, sw, sh int, usePool bool) Scaler {
+	z := &kernelScaler{
+		kernel:     q,
+		dw:         int32(dw),
+		dh:         int32(dh),
+		sw:         int32(sw),
+		sh:         int32(sh),
+		horizontal: newDistrib(q, int32(dw), int32(sw)),
+		vertical:   newDistrib(q, int32(dh), int32(sh)),
+	}
+	if usePool {
+		z.pool.New = func() interface{} {
+			tmp := z.makeTmpBuf()
+			return &tmp
+		}
+	}
+	return z
+}
+
+var (
+	// NearestNeighbor is the nearest neighbor interpolator. It is very fast,
+	// but usually gives very low quality results. When scaling up, the result
+	// will look 'blocky'.
+	NearestNeighbor = Interpolator(nnInterpolator{})
+
+	// ApproxBiLinear is a mixture of the nearest neighbor and bi-linear
+	// interpolators. It is fast, but usually gives medium quality results.
+	//
+	// It implements bi-linear interpolation when upscaling and a bi-linear
+	// blend of the 4 nearest neighbor pixels when downscaling. This yields
+	// nicer quality than nearest neighbor interpolation when upscaling, but
+	// the time taken is independent of the number of source pixels, unlike the
+	// bi-linear interpolator. When downscaling a large image, the performance
+	// difference can be significant.
+	ApproxBiLinear = Interpolator(ablInterpolator{})
+
+	// BiLinear is the tent kernel. It is slow, but usually gives high quality
+	// results.
+	BiLinear = &Kernel{1, func(t float64) float64 {
+		return 1 - t
+	}}
+
+	// CatmullRom is the Catmull-Rom kernel. It is very slow, but usually gives
+	// very high quality results.
+	//
+	// It is an instance of the more general cubic BC-spline kernel with parameters
+	// B=0 and C=0.5. See Mitchell and Netravali, "Reconstruction Filters in
+	// Computer Graphics", Computer Graphics, Vol. 22, No. 4, pp. 221-228.
+	CatmullRom = &Kernel{2, func(t float64) float64 {
+		if t < 1 {
+			return (1.5*t-2.5)*t*t + 1
+		}
+		return ((-0.5*t+2.5)*t-4)*t + 2
+	}}
+
+	// TODO: a Kaiser-Bessel kernel?
+)
+
+type nnInterpolator struct{}
+
+type ablInterpolator struct{}
+
+type kernelScaler struct {
+	kernel               *Kernel
+	dw, dh, sw, sh       int32
+	horizontal, vertical distrib
+	pool                 sync.Pool
+}
+
+func (z *kernelScaler) makeTmpBuf() [][4]float64 {
+	return make([][4]float64, z.dw*z.sh)
+}
+
+// source is a range of contribs, their inverse total weight, and that ITW
+// divided by 0xffff.
+type source struct {
+	i, j               int32
+	invTotalWeight     float64
+	invTotalWeightFFFF float64
+}
+
+// contrib is the weight of a column or row.
+type contrib struct {
+	coord  int32
+	weight float64
+}
+
+// distrib measures how source pixels are distributed over destination pixels.
+type distrib struct {
+	// sources are what contribs each column or row in the source image owns,
+	// and the total weight of those contribs.
+	sources []source
+	// contribs are the contributions indexed by sources[s].i and sources[s].j.
+	contribs []contrib
+}
+
+// newDistrib returns a distrib that distributes sw source columns (or rows)
+// over dw destination columns (or rows).
+func newDistrib(q *Kernel, dw, sw int32) distrib {
+	scale := float64(sw) / float64(dw)
+	halfWidth, kernelArgScale := q.Support, 1.0
+	// When shrinking, broaden the effective kernel support so that we still
+	// visit every source pixel.
+	if scale > 1 {
+		halfWidth *= scale
+		kernelArgScale = 1 / scale
+	}
+
+	// Make the sources slice, one source for each column or row, and temporarily
+	// appropriate its elements' fields so that invTotalWeight is the scaled
+	// coordinate of the source column or row, and i and j are the lower and
+	// upper bounds of the range of destination columns or rows affected by the
+	// source column or row.
+	n, sources := int32(0), make([]source, dw)
+	for x := range sources {
+		center := (float64(x)+0.5)*scale - 0.5
+		i := int32(math.Floor(center - halfWidth))
+		if i < 0 {
+			i = 0
+		}
+		j := int32(math.Ceil(center + halfWidth))
+		if j > sw {
+			j = sw
+			if j < i {
+				j = i
+			}
+		}
+		sources[x] = source{i: i, j: j, invTotalWeight: center}
+		n += j - i
+	}
+
+	contribs := make([]contrib, 0, n)
+	for k, b := range sources {
+		totalWeight := 0.0
+		l := int32(len(contribs))
+		for coord := b.i; coord < b.j; coord++ {
+			t := abs((b.invTotalWeight - float64(coord)) * kernelArgScale)
+			if t >= q.Support {
+				continue
+			}
+			weight := q.At(t)
+			if weight == 0 {
+				continue
+			}
+			totalWeight += weight
+			contribs = append(contribs, contrib{coord, weight})
+		}
+		totalWeight = 1 / totalWeight
+		sources[k] = source{
+			i:                  l,
+			j:                  int32(len(contribs)),
+			invTotalWeight:     totalWeight,
+			invTotalWeightFFFF: totalWeight / 0xffff,
+		}
+	}
+
+	return distrib{sources, contribs}
+}
+
+// abs is like math.Abs, but it doesn't care about negative zero, infinities or
+// NaNs.
+func abs(f float64) float64 {
+	if f < 0 {
+		f = -f
+	}
+	return f
+}
+
+// ftou converts the range [0.0, 1.0] to [0, 0xffff].
+func ftou(f float64) uint16 {
+	i := int32(0xffff*f + 0.5)
+	if i > 0xffff {
+		return 0xffff
+	}
+	if i > 0 {
+		return uint16(i)
+	}
+	return 0
+}
+
+// fffftou converts the range [0.0, 65535.0] to [0, 0xffff].
+func fffftou(f float64) uint16 {
+	i := int32(f + 0.5)
+	if i > 0xffff {
+		return 0xffff
+	}
+	if i > 0 {
+		return uint16(i)
+	}
+	return 0
+}
+
+// invert returns the inverse of m.
+//
+// TODO: move this into the f64 package, once we work out the convention for
+// matrix methods in that package: do they modify the receiver, take a dst
+// pointer argument, or return a new value?
+func invert(m *f64.Aff3) f64.Aff3 {
+	m00 := +m[3*1+1]
+	m01 := -m[3*0+1]
+	m02 := +m[3*1+2]*m[3*0+1] - m[3*1+1]*m[3*0+2]
+	m10 := -m[3*1+0]
+	m11 := +m[3*0+0]
+	m12 := +m[3*1+0]*m[3*0+2] - m[3*1+2]*m[3*0+0]
+
+	det := m00*m11 - m10*m01
+
+	return f64.Aff3{
+		m00 / det,
+		m01 / det,
+		m02 / det,
+		m10 / det,
+		m11 / det,
+		m12 / det,
+	}
+}
+
+func matMul(p, q *f64.Aff3) f64.Aff3 {
+	return f64.Aff3{
+		p[3*0+0]*q[3*0+0] + p[3*0+1]*q[3*1+0],
+		p[3*0+0]*q[3*0+1] + p[3*0+1]*q[3*1+1],
+		p[3*0+0]*q[3*0+2] + p[3*0+1]*q[3*1+2] + p[3*0+2],
+		p[3*1+0]*q[3*0+0] + p[3*1+1]*q[3*1+0],
+		p[3*1+0]*q[3*0+1] + p[3*1+1]*q[3*1+1],
+		p[3*1+0]*q[3*0+2] + p[3*1+1]*q[3*1+2] + p[3*1+2],
+	}
+}
+
+// transformRect returns a rectangle dr that contains sr transformed by s2d.
+func transformRect(s2d *f64.Aff3, sr *image.Rectangle) (dr image.Rectangle) {
+	ps := [...]image.Point{
+		{sr.Min.X, sr.Min.Y},
+		{sr.Max.X, sr.Min.Y},
+		{sr.Min.X, sr.Max.Y},
+		{sr.Max.X, sr.Max.Y},
+	}
+	for i, p := range ps {
+		sxf := float64(p.X)
+		syf := float64(p.Y)
+		dx := int(math.Floor(s2d[0]*sxf + s2d[1]*syf + s2d[2]))
+		dy := int(math.Floor(s2d[3]*sxf + s2d[4]*syf + s2d[5]))
+
+		// The +1 adjustments below are because an image.Rectangle is inclusive
+		// on the low end but exclusive on the high end.
+
+		if i == 0 {
+			dr = image.Rectangle{
+				Min: image.Point{dx + 0, dy + 0},
+				Max: image.Point{dx + 1, dy + 1},
+			}
+			continue
+		}
+
+		if dr.Min.X > dx {
+			dr.Min.X = dx
+		}
+		dx++
+		if dr.Max.X < dx {
+			dr.Max.X = dx
+		}
+
+		if dr.Min.Y > dy {
+			dr.Min.Y = dy
+		}
+		dy++
+		if dr.Max.Y < dy {
+			dr.Max.Y = dy
+		}
+	}
+	return dr
+}
+
+func clipAffectedDestRect(adr image.Rectangle, dstMask image.Image, dstMaskP image.Point) (image.Rectangle, image.Image) {
+	if dstMask == nil {
+		return adr, nil
+	}
+	if r, ok := dstMask.(image.Rectangle); ok {
+		return adr.Intersect(r.Sub(dstMaskP)), nil
+	}
+	// TODO: clip to dstMask.Bounds() if the color model implies that out-of-bounds means 0 alpha?
+	return adr, dstMask
+}
+
+func transform_Uniform(dst Image, dr, adr image.Rectangle, d2s *f64.Aff3, src *image.Uniform, sr image.Rectangle, bias image.Point, op Op) {
+	switch op {
+	case Over:
+		switch dst := dst.(type) {
+		case *image.RGBA:
+			pr, pg, pb, pa := src.C.RGBA()
+			pa1 := (0xffff - pa) * 0x101
+
+			for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+				dyf := float64(dr.Min.Y+int(dy)) + 0.5
+				d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+				for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+					dxf := float64(dr.Min.X+int(dx)) + 0.5
+					sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+					sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+					if !(image.Point{sx0, sy0}).In(sr) {
+						continue
+					}
+					dst.Pix[d+0] = uint8((uint32(dst.Pix[d+0])*pa1/0xffff + pr) >> 8)
+					dst.Pix[d+1] = uint8((uint32(dst.Pix[d+1])*pa1/0xffff + pg) >> 8)
+					dst.Pix[d+2] = uint8((uint32(dst.Pix[d+2])*pa1/0xffff + pb) >> 8)
+					dst.Pix[d+3] = uint8((uint32(dst.Pix[d+3])*pa1/0xffff + pa) >> 8)
+				}
+			}
+
+		default:
+			pr, pg, pb, pa := src.C.RGBA()
+			pa1 := 0xffff - pa
+			dstColorRGBA64 := &color.RGBA64{}
+			dstColor := color.Color(dstColorRGBA64)
+
+			for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+				dyf := float64(dr.Min.Y+int(dy)) + 0.5
+				for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+					dxf := float64(dr.Min.X+int(dx)) + 0.5
+					sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+					sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+					if !(image.Point{sx0, sy0}).In(sr) {
+						continue
+					}
+					qr, qg, qb, qa := dst.At(dr.Min.X+int(dx), dr.Min.Y+int(dy)).RGBA()
+					dstColorRGBA64.R = uint16(qr*pa1/0xffff + pr)
+					dstColorRGBA64.G = uint16(qg*pa1/0xffff + pg)
+					dstColorRGBA64.B = uint16(qb*pa1/0xffff + pb)
+					dstColorRGBA64.A = uint16(qa*pa1/0xffff + pa)
+					dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+				}
+			}
+		}
+
+	case Src:
+		switch dst := dst.(type) {
+		case *image.RGBA:
+			pr, pg, pb, pa := src.C.RGBA()
+			pr8 := uint8(pr >> 8)
+			pg8 := uint8(pg >> 8)
+			pb8 := uint8(pb >> 8)
+			pa8 := uint8(pa >> 8)
+
+			for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+				dyf := float64(dr.Min.Y+int(dy)) + 0.5
+				d := dst.PixOffset(dr.Min.X+adr.Min.X, dr.Min.Y+int(dy))
+				for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx, d = dx+1, d+4 {
+					dxf := float64(dr.Min.X+int(dx)) + 0.5
+					sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+					sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+					if !(image.Point{sx0, sy0}).In(sr) {
+						continue
+					}
+					dst.Pix[d+0] = pr8
+					dst.Pix[d+1] = pg8
+					dst.Pix[d+2] = pb8
+					dst.Pix[d+3] = pa8
+				}
+			}
+
+		default:
+			pr, pg, pb, pa := src.C.RGBA()
+			dstColorRGBA64 := &color.RGBA64{
+				uint16(pr),
+				uint16(pg),
+				uint16(pb),
+				uint16(pa),
+			}
+			dstColor := color.Color(dstColorRGBA64)
+
+			for dy := int32(adr.Min.Y); dy < int32(adr.Max.Y); dy++ {
+				dyf := float64(dr.Min.Y+int(dy)) + 0.5
+				for dx := int32(adr.Min.X); dx < int32(adr.Max.X); dx++ {
+					dxf := float64(dr.Min.X+int(dx)) + 0.5
+					sx0 := int(d2s[0]*dxf+d2s[1]*dyf+d2s[2]) + bias.X
+					sy0 := int(d2s[3]*dxf+d2s[4]*dyf+d2s[5]) + bias.Y
+					if !(image.Point{sx0, sy0}).In(sr) {
+						continue
+					}
+					dst.Set(dr.Min.X+int(dx), dr.Min.Y+int(dy), dstColor)
+				}
+			}
+		}
+	}
+}
+
+func opaque(m image.Image) bool {
+	o, ok := m.(interface {
+		Opaque() bool
+	})
+	return ok && o.Opaque()
+}
diff --git a/server/vendor/golang.org/x/image/font/basicfont/basicfont.go b/server/vendor/golang.org/x/image/font/basicfont/basicfont.go
new file mode 100644
index 000000000..15503818f
--- /dev/null
+++ b/server/vendor/golang.org/x/image/font/basicfont/basicfont.go
@@ -0,0 +1,129 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:generate go run gen.go
+
+// Package basicfont provides fixed-size font faces.
+package basicfont // import "golang.org/x/image/font/basicfont"
+
+import (
+	"image"
+
+	"golang.org/x/image/font"
+	"golang.org/x/image/math/fixed"
+)
+
+// Range maps a contiguous range of runes to vertically adjacent sub-images of
+// a Face's Mask image. The rune range is inclusive on the low end and
+// exclusive on the high end.
+//
+// If Low <= r && r < High, then the rune r is mapped to the sub-image of
+// Face.Mask whose bounds are image.Rect(0, y*h, Face.Width, (y+1)*h),
+// where y = (int(r-Low) + Offset) and h = (Face.Ascent + Face.Descent).
+type Range struct {
+	Low, High rune
+	Offset    int
+}
+
+// Face7x13 is a Face derived from the public domain X11 misc-fixed font files.
+//
+// At the moment, it holds the printable characters in ASCII starting with
+// space, and the Unicode replacement character U+FFFD.
+//
+// Its data is entirely self-contained and does not require loading from
+// separate files.
+var Face7x13 = &Face{
+	Advance: 7,
+	Width:   6,
+	Height:  13,
+	Ascent:  11,
+	Descent: 2,
+	Mask:    mask7x13,
+	Ranges: []Range{
+		{'\u0020', '\u007f', 0},
+		{'\ufffd', '\ufffe', 95},
+	},
+}
+
+// Face is a basic font face whose glyphs all have the same metrics.
+//
+// It is safe to use concurrently.
+type Face struct {
+	// Advance is the glyph advance, in pixels.
+	Advance int
+	// Width is the glyph width, in pixels.
+	Width int
+	// Height is the inter-line height, in pixels.
+	Height int
+	// Ascent is the glyph ascent, in pixels.
+	Ascent int
+	// Descent is the glyph descent, in pixels.
+	Descent int
+	// Left is the left side bearing, in pixels. A positive value means that
+	// all of a glyph is to the right of the dot.
+	Left int
+
+	// Mask contains all of the glyph masks. Its width is typically the Face's
+	// Width, and its height a multiple of the Face's Height.
+	Mask image.Image
+	// Ranges map runes to sub-images of Mask. The rune ranges must not
+	// overlap, and must be in increasing rune order.
+	Ranges []Range
+}
+
+func (f *Face) Close() error                   { return nil }
+func (f *Face) Kern(r0, r1 rune) fixed.Int26_6 { return 0 }
+
+func (f *Face) Metrics() font.Metrics {
+	return font.Metrics{
+		Height:     fixed.I(f.Height),
+		Ascent:     fixed.I(f.Ascent),
+		Descent:    fixed.I(f.Descent),
+		XHeight:    fixed.I(f.Ascent),
+		CapHeight:  fixed.I(f.Ascent),
+		CaretSlope: image.Point{X: 0, Y: 1},
+	}
+}
+
+func (f *Face) Glyph(dot fixed.Point26_6, r rune) (
+	dr image.Rectangle, mask image.Image, maskp image.Point, advance fixed.Int26_6, ok bool) {
+
+loop:
+	for _, rr := range [2]rune{r, '\ufffd'} {
+		for _, rng := range f.Ranges {
+			if rr < rng.Low || rng.High <= rr {
+				continue
+			}
+			maskp.Y = (int(rr-rng.Low) + rng.Offset) * (f.Ascent + f.Descent)
+			ok = true
+			break loop
+		}
+	}
+	if !ok {
+		return image.Rectangle{}, nil, image.Point{}, 0, false
+	}
+
+	x := int(dot.X+32)>>6 + f.Left
+	y := int(dot.Y+32) >> 6
+	dr = image.Rectangle{
+		Min: image.Point{
+			X: x,
+			Y: y - f.Ascent,
+		},
+		Max: image.Point{
+			X: x + f.Width,
+			Y: y + f.Descent,
+		},
+	}
+
+	return dr, f.Mask, maskp, fixed.I(f.Advance), true
+}
+
+func (f *Face) GlyphBounds(r rune) (bounds fixed.Rectangle26_6, advance fixed.Int26_6, ok bool) {
+	return fixed.R(0, -f.Ascent, f.Width, +f.Descent), fixed.I(f.Advance), true
+}
+
+func (f *Face) GlyphAdvance(r rune) (advance fixed.Int26_6, ok bool) {
+	return fixed.I(f.Advance), true
+}
diff --git a/server/vendor/golang.org/x/image/font/basicfont/data.go b/server/vendor/golang.org/x/image/font/basicfont/data.go
new file mode 100644
index 000000000..883532117
--- /dev/null
+++ b/server/vendor/golang.org/x/image/font/basicfont/data.go
@@ -0,0 +1,1456 @@
+// generated by go generate; DO NOT EDIT.
+
+package basicfont
+
+// This data is derived from files in the font/fixed directory of the Plan 9
+// Port source code (https://github.com/9fans/plan9port) which were originally
+// based on the public domain X11 misc-fixed font files.
+
+import "image"
+
+// mask7x13 contains 96 6×13 glyphs in 7488 Pix bytes.
+var mask7x13 = &image.Alpha{
+	Stride: 6,
+	Rect:   image.Rectangle{Max: image.Point{6, 96 * 13}},
+	Pix: []byte{
+		// 0x20 ' '
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x21 '!'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x22 '"'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x23 '#'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x24 '$'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x25 '%'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0xff, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x26 '&'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x27 '\''
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x28 '('
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x29 ')'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x2a '*'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x2b '+'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x2c ','
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x2d '-'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x2e '.'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x2f '/'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x30 '0'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x31 '1'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x32 '2'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x33 '3'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x34 '4'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x35 '5'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x36 '6'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x37 '7'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x38 '8'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x39 '9'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x3a ':'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x3b ';'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x3c '<'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x3d '='
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x3e '>'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x3f '?'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x40 '@'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0xff, 0xff, 0xff,
+		0xff, 0x00, 0xff, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0xff, 0x00, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x41 'A'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x42 'B'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x43 'C'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x44 'D'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x45 'E'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x46 'F'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x47 'G'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0xff, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x48 'H'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x49 'I'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x4a 'J'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x4b 'K'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0xff, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x4c 'L'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x4d 'M'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0x00, 0x00, 0xff, 0xff,
+		0xff, 0xff, 0x00, 0x00, 0xff, 0xff,
+		0xff, 0x00, 0xff, 0xff, 0x00, 0xff,
+		0xff, 0x00, 0xff, 0xff, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x4e 'N'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0xff, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x4f 'O'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x50 'P'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x51 'Q'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0xff, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x52 'R'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x53 'S'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x54 'T'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x55 'U'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x56 'V'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x57 'W'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0xff, 0xff, 0x00, 0xff,
+		0xff, 0x00, 0xff, 0xff, 0x00, 0xff,
+		0xff, 0xff, 0x00, 0x00, 0xff, 0xff,
+		0xff, 0xff, 0x00, 0x00, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x58 'X'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x59 'Y'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x5a 'Z'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x5b '['
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x5c '\\'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x5d ']'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x5e '^'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x5f '_'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x60 '`'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x61 'a'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x62 'b'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x63 'c'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x64 'd'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x65 'e'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x66 'f'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x67 'g'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+
+		// 0x68 'h'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x69 'i'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x6a 'j'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+
+		// 0x6b 'k'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x6c 'l'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x6d 'm'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x6e 'n'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x6f 'o'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x70 'p'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x71 'q'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+
+		// 0x72 'r'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x73 's'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x74 't'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x75 'u'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x76 'v'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x77 'w'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0x00, 0xff, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x78 'x'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x79 'y'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0xff, 0x00, 0x00, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0x00,
+
+		// 0x7a 'z'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0x00, 0x00, 0x00, 0x00,
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x7b '{'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x7c '|'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x7d '}'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
+		0x00, 0x00, 0x00, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// 0x7e '~'
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0x00, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0x00, 0x00, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+		// U+FFFD REPLACEMENT CHARACTER
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0xff, 0xff, 0x00, 0xff, 0xff,
+		0x00, 0xff, 0x00, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0x00, 0xff,
+		0x00, 0xff, 0xff, 0x00, 0xff, 0xff,
+		0x00, 0xff, 0xff, 0x00, 0xff, 0xff,
+		0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0xff, 0xff, 0x00, 0xff, 0xff,
+		0x00, 0x00, 0xff, 0xff, 0xff, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	},
+}
diff --git a/server/vendor/golang.org/x/image/font/font.go b/server/vendor/golang.org/x/image/font/font.go
new file mode 100644
index 000000000..4d9d63c24
--- /dev/null
+++ b/server/vendor/golang.org/x/image/font/font.go
@@ -0,0 +1,371 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package font defines an interface for font faces, for drawing text on an
+// image.
+//
+// Other packages provide font face implementations. For example, a truetype
+// package would provide one based on .ttf font files.
+package font // import "golang.org/x/image/font"
+
+import (
+	"image"
+	"image/draw"
+	"io"
+	"unicode/utf8"
+
+	"golang.org/x/image/math/fixed"
+)
+
+// TODO: who is responsible for caches (glyph images, glyph indices, kerns)?
+// The Drawer or the Face?
+
+// Face is a font face. Its glyphs are often derived from a font file, such as
+// "Comic_Sans_MS.ttf", but a face has a specific size, style, weight and
+// hinting. For example, the 12pt and 18pt versions of Comic Sans are two
+// different faces, even if derived from the same font file.
+//
+// A Face is not safe for concurrent use by multiple goroutines, as its methods
+// may re-use implementation-specific caches and mask image buffers.
+//
+// To create a Face, look to other packages that implement specific font file
+// formats.
+type Face interface {
+	io.Closer
+
+	// Glyph returns the draw.DrawMask parameters (dr, mask, maskp) to draw r's
+	// glyph at the sub-pixel destination location dot, and that glyph's
+	// advance width.
+	//
+	// It returns !ok if the face does not contain a glyph for r.
+	//
+	// The contents of the mask image returned by one Glyph call may change
+	// after the next Glyph call. Callers that want to cache the mask must make
+	// a copy.
+	Glyph(dot fixed.Point26_6, r rune) (
+		dr image.Rectangle, mask image.Image, maskp image.Point, advance fixed.Int26_6, ok bool)
+
+	// GlyphBounds returns the bounding box of r's glyph, drawn at a dot equal
+	// to the origin, and that glyph's advance width.
+	//
+	// It returns !ok if the face does not contain a glyph for r.
+	//
+	// The glyph's ascent and descent equal -bounds.Min.Y and +bounds.Max.Y. A
+	// visual depiction of what these metrics are is at
+	// https://developer.apple.com/library/mac/documentation/TextFonts/Conceptual/CocoaTextArchitecture/Art/glyph_metrics_2x.png
+	GlyphBounds(r rune) (bounds fixed.Rectangle26_6, advance fixed.Int26_6, ok bool)
+
+	// GlyphAdvance returns the advance width of r's glyph.
+	//
+	// It returns !ok if the face does not contain a glyph for r.
+	GlyphAdvance(r rune) (advance fixed.Int26_6, ok bool)
+
+	// Kern returns the horizontal adjustment for the kerning pair (r0, r1). A
+	// positive kern means to move the glyphs further apart.
+	Kern(r0, r1 rune) fixed.Int26_6
+
+	// Metrics returns the metrics for this Face.
+	Metrics() Metrics
+
+	// TODO: ColoredGlyph for various emoji?
+	// TODO: Ligatures? Shaping?
+}
+
+// Metrics holds the metrics for a Face. A visual depiction is at
+// https://developer.apple.com/library/mac/documentation/TextFonts/Conceptual/CocoaTextArchitecture/Art/glyph_metrics_2x.png
+type Metrics struct {
+	// Height is the recommended amount of vertical space between two lines of
+	// text.
+	Height fixed.Int26_6
+
+	// Ascent is the distance from the top of a line to its baseline.
+	Ascent fixed.Int26_6
+
+	// Descent is the distance from the bottom of a line to its baseline. The
+	// value is typically positive, even though a descender goes below the
+	// baseline.
+	Descent fixed.Int26_6
+
+	// XHeight is the distance from the top of non-ascending lowercase letters
+	// to the baseline.
+	XHeight fixed.Int26_6
+
+	// CapHeight is the distance from the top of uppercase letters to the
+	// baseline.
+	CapHeight fixed.Int26_6
+
+	// CaretSlope is the slope of a caret as a vector with the Y axis pointing up.
+	// The slope {0, 1} is the vertical caret.
+	CaretSlope image.Point
+}
+
+// Drawer draws text on a destination image.
+//
+// A Drawer is not safe for concurrent use by multiple goroutines, since its
+// Face is not.
+type Drawer struct {
+	// Dst is the destination image.
+	Dst draw.Image
+	// Src is the source image.
+	Src image.Image
+	// Face provides the glyph mask images.
+	Face Face
+	// Dot is the baseline location to draw the next glyph. The majority of the
+	// affected pixels will be above and to the right of the dot, but some may
+	// be below or to the left. For example, drawing a 'j' in an italic face
+	// may affect pixels below and to the left of the dot.
+	Dot fixed.Point26_6
+
+	// TODO: Clip image.Image?
+	// TODO: SrcP image.Point for Src images other than *image.Uniform? How
+	// does it get updated during DrawString?
+}
+
+// TODO: should DrawString return the last rune drawn, so the next DrawString
+// call can kern beforehand? Or should that be the responsibility of the caller
+// if they really want to do that, since they have to explicitly shift d.Dot
+// anyway? What if ligatures span more than two runes? What if grapheme
+// clusters span multiple runes?
+//
+// TODO: do we assume that the input is in any particular Unicode Normalization
+// Form?
+//
+// TODO: have DrawRunes(s []rune)? DrawRuneReader(io.RuneReader)?? If we take
+// io.RuneReader, we can't assume that we can rewind the stream.
+//
+// TODO: how does this work with line breaking: drawing text up until a
+// vertical line? Should DrawString return the number of runes drawn?
+
+// DrawBytes draws s at the dot and advances the dot's location.
+//
+// It is equivalent to DrawString(string(s)) but may be more efficient.
+func (d *Drawer) DrawBytes(s []byte) {
+	prevC := rune(-1)
+	for len(s) > 0 {
+		c, size := utf8.DecodeRune(s)
+		s = s[size:]
+		if prevC >= 0 {
+			d.Dot.X += d.Face.Kern(prevC, c)
+		}
+		dr, mask, maskp, advance, ok := d.Face.Glyph(d.Dot, c)
+		if !ok {
+			// TODO: is falling back on the U+FFFD glyph the responsibility of
+			// the Drawer or the Face?
+			// TODO: set prevC = '\ufffd'?
+			continue
+		}
+		draw.DrawMask(d.Dst, dr, d.Src, image.Point{}, mask, maskp, draw.Over)
+		d.Dot.X += advance
+		prevC = c
+	}
+}
+
+// DrawString draws s at the dot and advances the dot's location.
+func (d *Drawer) DrawString(s string) {
+	prevC := rune(-1)
+	for _, c := range s {
+		if prevC >= 0 {
+			d.Dot.X += d.Face.Kern(prevC, c)
+		}
+		dr, mask, maskp, advance, ok := d.Face.Glyph(d.Dot, c)
+		if !ok {
+			// TODO: is falling back on the U+FFFD glyph the responsibility of
+			// the Drawer or the Face?
+			// TODO: set prevC = '\ufffd'?
+			continue
+		}
+		draw.DrawMask(d.Dst, dr, d.Src, image.Point{}, mask, maskp, draw.Over)
+		d.Dot.X += advance
+		prevC = c
+	}
+}
+
+// BoundBytes returns the bounding box of s, drawn at the drawer dot, as well as
+// the advance.
+//
+// It is equivalent to BoundBytes(string(s)) but may be more efficient.
+func (d *Drawer) BoundBytes(s []byte) (bounds fixed.Rectangle26_6, advance fixed.Int26_6) {
+	bounds, advance = BoundBytes(d.Face, s)
+	bounds.Min = bounds.Min.Add(d.Dot)
+	bounds.Max = bounds.Max.Add(d.Dot)
+	return
+}
+
+// BoundString returns the bounding box of s, drawn at the drawer dot, as well
+// as the advance.
+func (d *Drawer) BoundString(s string) (bounds fixed.Rectangle26_6, advance fixed.Int26_6) {
+	bounds, advance = BoundString(d.Face, s)
+	bounds.Min = bounds.Min.Add(d.Dot)
+	bounds.Max = bounds.Max.Add(d.Dot)
+	return
+}
+
+// MeasureBytes returns how far dot would advance by drawing s.
+//
+// It is equivalent to MeasureString(string(s)) but may be more efficient.
+func (d *Drawer) MeasureBytes(s []byte) (advance fixed.Int26_6) {
+	return MeasureBytes(d.Face, s)
+}
+
+// MeasureString returns how far dot would advance by drawing s.
+func (d *Drawer) MeasureString(s string) (advance fixed.Int26_6) {
+	return MeasureString(d.Face, s)
+}
+
+// BoundBytes returns the bounding box of s with f, drawn at a dot equal to the
+// origin, as well as the advance.
+//
+// It is equivalent to BoundString(string(s)) but may be more efficient.
+func BoundBytes(f Face, s []byte) (bounds fixed.Rectangle26_6, advance fixed.Int26_6) {
+	prevC := rune(-1)
+	for len(s) > 0 {
+		c, size := utf8.DecodeRune(s)
+		s = s[size:]
+		if prevC >= 0 {
+			advance += f.Kern(prevC, c)
+		}
+		b, a, ok := f.GlyphBounds(c)
+		if !ok {
+			// TODO: is falling back on the U+FFFD glyph the responsibility of
+			// the Drawer or the Face?
+			// TODO: set prevC = '\ufffd'?
+			continue
+		}
+		b.Min.X += advance
+		b.Max.X += advance
+		bounds = bounds.Union(b)
+		advance += a
+		prevC = c
+	}
+	return
+}
+
+// BoundString returns the bounding box of s with f, drawn at a dot equal to the
+// origin, as well as the advance.
+func BoundString(f Face, s string) (bounds fixed.Rectangle26_6, advance fixed.Int26_6) {
+	prevC := rune(-1)
+	for _, c := range s {
+		if prevC >= 0 {
+			advance += f.Kern(prevC, c)
+		}
+		b, a, ok := f.GlyphBounds(c)
+		if !ok {
+			// TODO: is falling back on the U+FFFD glyph the responsibility of
+			// the Drawer or the Face?
+			// TODO: set prevC = '\ufffd'?
+			continue
+		}
+		b.Min.X += advance
+		b.Max.X += advance
+		bounds = bounds.Union(b)
+		advance += a
+		prevC = c
+	}
+	return
+}
+
+// MeasureBytes returns how far dot would advance by drawing s with f.
+//
+// It is equivalent to MeasureString(string(s)) but may be more efficient.
+func MeasureBytes(f Face, s []byte) (advance fixed.Int26_6) {
+	prevC := rune(-1)
+	for len(s) > 0 {
+		c, size := utf8.DecodeRune(s)
+		s = s[size:]
+		if prevC >= 0 {
+			advance += f.Kern(prevC, c)
+		}
+		a, ok := f.GlyphAdvance(c)
+		if !ok {
+			// TODO: is falling back on the U+FFFD glyph the responsibility of
+			// the Drawer or the Face?
+			// TODO: set prevC = '\ufffd'?
+			continue
+		}
+		advance += a
+		prevC = c
+	}
+	return advance
+}
+
+// MeasureString returns how far dot would advance by drawing s with f.
+func MeasureString(f Face, s string) (advance fixed.Int26_6) {
+	prevC := rune(-1)
+	for _, c := range s {
+		if prevC >= 0 {
+			advance += f.Kern(prevC, c)
+		}
+		a, ok := f.GlyphAdvance(c)
+		if !ok {
+			// TODO: is falling back on the U+FFFD glyph the responsibility of
+			// the Drawer or the Face?
+			// TODO: set prevC = '\ufffd'?
+			continue
+		}
+		advance += a
+		prevC = c
+	}
+	return advance
+}
+
+// Hinting selects how to quantize a vector font's glyph nodes.
+//
+// Not all fonts support hinting.
+type Hinting int
+
+const (
+	HintingNone Hinting = iota
+	HintingVertical
+	HintingFull
+)
+
+// Stretch selects a normal, condensed, or expanded face.
+//
+// Not all fonts support stretches.
+type Stretch int
+
+const (
+	StretchUltraCondensed Stretch = -4
+	StretchExtraCondensed Stretch = -3
+	StretchCondensed      Stretch = -2
+	StretchSemiCondensed  Stretch = -1
+	StretchNormal         Stretch = +0
+	StretchSemiExpanded   Stretch = +1
+	StretchExpanded       Stretch = +2
+	StretchExtraExpanded  Stretch = +3
+	StretchUltraExpanded  Stretch = +4
+)
+
+// Style selects a normal, italic, or oblique face.
+//
+// Not all fonts support styles.
+type Style int
+
+const (
+	StyleNormal Style = iota
+	StyleItalic
+	StyleOblique
+)
+
+// Weight selects a normal, light or bold face.
+//
+// Not all fonts support weights.
+//
+// The named Weight constants (e.g. WeightBold) correspond to CSS' common
+// weight names (e.g. "Bold"), but the numerical values differ, so that in Go,
+// the zero value means to use a normal weight. For the CSS names and values,
+// see https://developer.mozilla.org/en/docs/Web/CSS/font-weight
+type Weight int
+
+const (
+	WeightThin       Weight = -3 // CSS font-weight value 100.
+	WeightExtraLight Weight = -2 // CSS font-weight value 200.
+	WeightLight      Weight = -1 // CSS font-weight value 300.
+	WeightNormal     Weight = +0 // CSS font-weight value 400.
+	WeightMedium     Weight = +1 // CSS font-weight value 500.
+	WeightSemiBold   Weight = +2 // CSS font-weight value 600.
+	WeightBold       Weight = +3 // CSS font-weight value 700.
+	WeightExtraBold  Weight = +4 // CSS font-weight value 800.
+	WeightBlack      Weight = +5 // CSS font-weight value 900.
+)
diff --git a/server/vendor/golang.org/x/image/math/f64/f64.go b/server/vendor/golang.org/x/image/math/f64/f64.go
new file mode 100644
index 000000000..a1f7fc0ef
--- /dev/null
+++ b/server/vendor/golang.org/x/image/math/f64/f64.go
@@ -0,0 +1,37 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package f64 implements float64 vector and matrix types.
+package f64 // import "golang.org/x/image/math/f64"
+
+// Vec2 is a 2-element vector.
+type Vec2 [2]float64
+
+// Vec3 is a 3-element vector.
+type Vec3 [3]float64
+
+// Vec4 is a 4-element vector.
+type Vec4 [4]float64
+
+// Mat3 is a 3x3 matrix in row major order.
+//
+// m[3*r + c] is the element in the r'th row and c'th column.
+type Mat3 [9]float64
+
+// Mat4 is a 4x4 matrix in row major order.
+//
+// m[4*r + c] is the element in the r'th row and c'th column.
+type Mat4 [16]float64
+
+// Aff3 is a 3x3 affine transformation matrix in row major order, where the
+// bottom row is implicitly [0 0 1].
+//
+// m[3*r + c] is the element in the r'th row and c'th column.
+type Aff3 [6]float64
+
+// Aff4 is a 4x4 affine transformation matrix in row major order, where the
+// bottom row is implicitly [0 0 0 1].
+//
+// m[4*r + c] is the element in the r'th row and c'th column.
+type Aff4 [12]float64
diff --git a/server/vendor/golang.org/x/image/math/fixed/fixed.go b/server/vendor/golang.org/x/image/math/fixed/fixed.go
new file mode 100644
index 000000000..3d916638f
--- /dev/null
+++ b/server/vendor/golang.org/x/image/math/fixed/fixed.go
@@ -0,0 +1,410 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package fixed implements fixed-point integer types.
+package fixed // import "golang.org/x/image/math/fixed"
+
+import (
+	"fmt"
+)
+
+// TODO: implement fmt.Formatter for %f and %g.
+
+// I returns the integer value i as an Int26_6.
+//
+// For example, passing the integer value 2 yields Int26_6(128).
+func I(i int) Int26_6 {
+	return Int26_6(i << 6)
+}
+
+// Int26_6 is a signed 26.6 fixed-point number.
+//
+// The integer part ranges from -33554432 to 33554431, inclusive. The
+// fractional part has 6 bits of precision.
+//
+// For example, the number one-and-a-quarter is Int26_6(1<<6 + 1<<4).
+type Int26_6 int32
+
+// String returns a human-readable representation of a 26.6 fixed-point number.
+//
+// For example, the number one-and-a-quarter becomes "1:16".
+func (x Int26_6) String() string {
+	const shift, mask = 6, 1<<6 - 1
+	if x >= 0 {
+		return fmt.Sprintf("%d:%02d", int32(x>>shift), int32(x&mask))
+	}
+	x = -x
+	if x >= 0 {
+		return fmt.Sprintf("-%d:%02d", int32(x>>shift), int32(x&mask))
+	}
+	return "-33554432:00" // The minimum value is -(1<<25).
+}
+
+// Floor returns the greatest integer value less than or equal to x.
+//
+// Its return type is int, not Int26_6.
+func (x Int26_6) Floor() int { return int((x + 0x00) >> 6) }
+
+// Round returns the nearest integer value to x. Ties are rounded up.
+//
+// Its return type is int, not Int26_6.
+func (x Int26_6) Round() int { return int((x + 0x20) >> 6) }
+
+// Ceil returns the least integer value greater than or equal to x.
+//
+// Its return type is int, not Int26_6.
+func (x Int26_6) Ceil() int { return int((x + 0x3f) >> 6) }
+
+// Mul returns x*y in 26.6 fixed-point arithmetic.
+func (x Int26_6) Mul(y Int26_6) Int26_6 {
+	return Int26_6((int64(x)*int64(y) + 1<<5) >> 6)
+}
+
+// Int52_12 is a signed 52.12 fixed-point number.
+//
+// The integer part ranges from -2251799813685248 to 2251799813685247,
+// inclusive. The fractional part has 12 bits of precision.
+//
+// For example, the number one-and-a-quarter is Int52_12(1<<12 + 1<<10).
+type Int52_12 int64
+
+// String returns a human-readable representation of a 52.12 fixed-point
+// number.
+//
+// For example, the number one-and-a-quarter becomes "1:1024".
+func (x Int52_12) String() string {
+	const shift, mask = 12, 1<<12 - 1
+	if x >= 0 {
+		return fmt.Sprintf("%d:%04d", int64(x>>shift), int64(x&mask))
+	}
+	x = -x
+	if x >= 0 {
+		return fmt.Sprintf("-%d:%04d", int64(x>>shift), int64(x&mask))
+	}
+	return "-2251799813685248:0000" // The minimum value is -(1<<51).
+}
+
+// Floor returns the greatest integer value less than or equal to x.
+//
+// Its return type is int, not Int52_12.
+func (x Int52_12) Floor() int { return int((x + 0x000) >> 12) }
+
+// Round returns the nearest integer value to x. Ties are rounded up.
+//
+// Its return type is int, not Int52_12.
+func (x Int52_12) Round() int { return int((x + 0x800) >> 12) }
+
+// Ceil returns the least integer value greater than or equal to x.
+//
+// Its return type is int, not Int52_12.
+func (x Int52_12) Ceil() int { return int((x + 0xfff) >> 12) }
+
+// Mul returns x*y in 52.12 fixed-point arithmetic.
+func (x Int52_12) Mul(y Int52_12) Int52_12 {
+	const M, N = 52, 12
+	lo, hi := muli64(int64(x), int64(y))
+	ret := Int52_12(hi<<M | lo>>N)
+	ret += Int52_12((lo >> (N - 1)) & 1) // Round to nearest, instead of rounding down.
+	return ret
+}
+
+// muli64 multiplies two int64 values, returning the 128-bit signed integer
+// result as two uint64 values.
+//
+// This implementation is similar to $GOROOT/src/runtime/softfloat64.go's mullu
+// function, which is in turn adapted from Hacker's Delight.
+func muli64(u, v int64) (lo, hi uint64) {
+	const (
+		s    = 32
+		mask = 1<<s - 1
+	)
+
+	u1 := uint64(u >> s)
+	u0 := uint64(u & mask)
+	v1 := uint64(v >> s)
+	v0 := uint64(v & mask)
+
+	w0 := u0 * v0
+	t := u1*v0 + w0>>s
+	w1 := t & mask
+	w2 := uint64(int64(t) >> s)
+	w1 += u0 * v1
+	return uint64(u) * uint64(v), u1*v1 + w2 + uint64(int64(w1)>>s)
+}
+
+// P returns the integer values x and y as a Point26_6.
+//
+// For example, passing the integer values (2, -3) yields Point26_6{128, -192}.
+func P(x, y int) Point26_6 {
+	return Point26_6{Int26_6(x << 6), Int26_6(y << 6)}
+}
+
+// Point26_6 is a 26.6 fixed-point coordinate pair.
+//
+// It is analogous to the image.Point type in the standard library.
+type Point26_6 struct {
+	X, Y Int26_6
+}
+
+// Add returns the vector p+q.
+func (p Point26_6) Add(q Point26_6) Point26_6 {
+	return Point26_6{p.X + q.X, p.Y + q.Y}
+}
+
+// Sub returns the vector p-q.
+func (p Point26_6) Sub(q Point26_6) Point26_6 {
+	return Point26_6{p.X - q.X, p.Y - q.Y}
+}
+
+// Mul returns the vector p*k.
+func (p Point26_6) Mul(k Int26_6) Point26_6 {
+	return Point26_6{p.X * k / 64, p.Y * k / 64}
+}
+
+// Div returns the vector p/k.
+func (p Point26_6) Div(k Int26_6) Point26_6 {
+	return Point26_6{p.X * 64 / k, p.Y * 64 / k}
+}
+
+// In returns whether p is in r.
+func (p Point26_6) In(r Rectangle26_6) bool {
+	return r.Min.X <= p.X && p.X < r.Max.X && r.Min.Y <= p.Y && p.Y < r.Max.Y
+}
+
+// Point52_12 is a 52.12 fixed-point coordinate pair.
+//
+// It is analogous to the image.Point type in the standard library.
+type Point52_12 struct {
+	X, Y Int52_12
+}
+
+// Add returns the vector p+q.
+func (p Point52_12) Add(q Point52_12) Point52_12 {
+	return Point52_12{p.X + q.X, p.Y + q.Y}
+}
+
+// Sub returns the vector p-q.
+func (p Point52_12) Sub(q Point52_12) Point52_12 {
+	return Point52_12{p.X - q.X, p.Y - q.Y}
+}
+
+// Mul returns the vector p*k.
+func (p Point52_12) Mul(k Int52_12) Point52_12 {
+	return Point52_12{p.X * k / 4096, p.Y * k / 4096}
+}
+
+// Div returns the vector p/k.
+func (p Point52_12) Div(k Int52_12) Point52_12 {
+	return Point52_12{p.X * 4096 / k, p.Y * 4096 / k}
+}
+
+// In returns whether p is in r.
+func (p Point52_12) In(r Rectangle52_12) bool {
+	return r.Min.X <= p.X && p.X < r.Max.X && r.Min.Y <= p.Y && p.Y < r.Max.Y
+}
+
+// R returns the integer values minX, minY, maxX, maxY as a Rectangle26_6.
+//
+// For example, passing the integer values (0, 1, 2, 3) yields
+// Rectangle26_6{Point26_6{0, 64}, Point26_6{128, 192}}.
+//
+// Like the image.Rect function in the standard library, the returned rectangle
+// has minimum and maximum coordinates swapped if necessary so that it is
+// well-formed.
+func R(minX, minY, maxX, maxY int) Rectangle26_6 {
+	if minX > maxX {
+		minX, maxX = maxX, minX
+	}
+	if minY > maxY {
+		minY, maxY = maxY, minY
+	}
+	return Rectangle26_6{
+		Point26_6{
+			Int26_6(minX << 6),
+			Int26_6(minY << 6),
+		},
+		Point26_6{
+			Int26_6(maxX << 6),
+			Int26_6(maxY << 6),
+		},
+	}
+}
+
+// Rectangle26_6 is a 26.6 fixed-point coordinate rectangle. The Min bound is
+// inclusive and the Max bound is exclusive. It is well-formed if Min.X <=
+// Max.X and likewise for Y.
+//
+// It is analogous to the image.Rectangle type in the standard library.
+type Rectangle26_6 struct {
+	Min, Max Point26_6
+}
+
+// Add returns the rectangle r translated by p.
+func (r Rectangle26_6) Add(p Point26_6) Rectangle26_6 {
+	return Rectangle26_6{
+		Point26_6{r.Min.X + p.X, r.Min.Y + p.Y},
+		Point26_6{r.Max.X + p.X, r.Max.Y + p.Y},
+	}
+}
+
+// Sub returns the rectangle r translated by -p.
+func (r Rectangle26_6) Sub(p Point26_6) Rectangle26_6 {
+	return Rectangle26_6{
+		Point26_6{r.Min.X - p.X, r.Min.Y - p.Y},
+		Point26_6{r.Max.X - p.X, r.Max.Y - p.Y},
+	}
+}
+
+// Intersect returns the largest rectangle contained by both r and s. If the
+// two rectangles do not overlap then the zero rectangle will be returned.
+func (r Rectangle26_6) Intersect(s Rectangle26_6) Rectangle26_6 {
+	if r.Min.X < s.Min.X {
+		r.Min.X = s.Min.X
+	}
+	if r.Min.Y < s.Min.Y {
+		r.Min.Y = s.Min.Y
+	}
+	if r.Max.X > s.Max.X {
+		r.Max.X = s.Max.X
+	}
+	if r.Max.Y > s.Max.Y {
+		r.Max.Y = s.Max.Y
+	}
+	// Letting r0 and s0 be the values of r and s at the time that the method
+	// is called, this next line is equivalent to:
+	//
+	// if max(r0.Min.X, s0.Min.X) >= min(r0.Max.X, s0.Max.X) || likewiseForY { etc }
+	if r.Empty() {
+		return Rectangle26_6{}
+	}
+	return r
+}
+
+// Union returns the smallest rectangle that contains both r and s.
+func (r Rectangle26_6) Union(s Rectangle26_6) Rectangle26_6 {
+	if r.Empty() {
+		return s
+	}
+	if s.Empty() {
+		return r
+	}
+	if r.Min.X > s.Min.X {
+		r.Min.X = s.Min.X
+	}
+	if r.Min.Y > s.Min.Y {
+		r.Min.Y = s.Min.Y
+	}
+	if r.Max.X < s.Max.X {
+		r.Max.X = s.Max.X
+	}
+	if r.Max.Y < s.Max.Y {
+		r.Max.Y = s.Max.Y
+	}
+	return r
+}
+
+// Empty returns whether the rectangle contains no points.
+func (r Rectangle26_6) Empty() bool {
+	return r.Min.X >= r.Max.X || r.Min.Y >= r.Max.Y
+}
+
+// In returns whether every point in r is in s.
+func (r Rectangle26_6) In(s Rectangle26_6) bool {
+	if r.Empty() {
+		return true
+	}
+	// Note that r.Max is an exclusive bound for r, so that r.In(s)
+	// does not require that r.Max.In(s).
+	return s.Min.X <= r.Min.X && r.Max.X <= s.Max.X &&
+		s.Min.Y <= r.Min.Y && r.Max.Y <= s.Max.Y
+}
+
+// Rectangle52_12 is a 52.12 fixed-point coordinate rectangle. The Min bound is
+// inclusive and the Max bound is exclusive. It is well-formed if Min.X <=
+// Max.X and likewise for Y.
+//
+// It is analogous to the image.Rectangle type in the standard library.
+type Rectangle52_12 struct {
+	Min, Max Point52_12
+}
+
+// Add returns the rectangle r translated by p.
+func (r Rectangle52_12) Add(p Point52_12) Rectangle52_12 {
+	return Rectangle52_12{
+		Point52_12{r.Min.X + p.X, r.Min.Y + p.Y},
+		Point52_12{r.Max.X + p.X, r.Max.Y + p.Y},
+	}
+}
+
+// Sub returns the rectangle r translated by -p.
+func (r Rectangle52_12) Sub(p Point52_12) Rectangle52_12 {
+	return Rectangle52_12{
+		Point52_12{r.Min.X - p.X, r.Min.Y - p.Y},
+		Point52_12{r.Max.X - p.X, r.Max.Y - p.Y},
+	}
+}
+
+// Intersect returns the largest rectangle contained by both r and s. If the
+// two rectangles do not overlap then the zero rectangle will be returned.
+func (r Rectangle52_12) Intersect(s Rectangle52_12) Rectangle52_12 {
+	if r.Min.X < s.Min.X {
+		r.Min.X = s.Min.X
+	}
+	if r.Min.Y < s.Min.Y {
+		r.Min.Y = s.Min.Y
+	}
+	if r.Max.X > s.Max.X {
+		r.Max.X = s.Max.X
+	}
+	if r.Max.Y > s.Max.Y {
+		r.Max.Y = s.Max.Y
+	}
+	// Letting r0 and s0 be the values of r and s at the time that the method
+	// is called, this next line is equivalent to:
+	//
+	// if max(r0.Min.X, s0.Min.X) >= min(r0.Max.X, s0.Max.X) || likewiseForY { etc }
+	if r.Empty() {
+		return Rectangle52_12{}
+	}
+	return r
+}
+
+// Union returns the smallest rectangle that contains both r and s.
+func (r Rectangle52_12) Union(s Rectangle52_12) Rectangle52_12 {
+	if r.Empty() {
+		return s
+	}
+	if s.Empty() {
+		return r
+	}
+	if r.Min.X > s.Min.X {
+		r.Min.X = s.Min.X
+	}
+	if r.Min.Y > s.Min.Y {
+		r.Min.Y = s.Min.Y
+	}
+	if r.Max.X < s.Max.X {
+		r.Max.X = s.Max.X
+	}
+	if r.Max.Y < s.Max.Y {
+		r.Max.Y = s.Max.Y
+	}
+	return r
+}
+
+// Empty returns whether the rectangle contains no points.
+func (r Rectangle52_12) Empty() bool {
+	return r.Min.X >= r.Max.X || r.Min.Y >= r.Max.Y
+}
+
+// In returns whether every point in r is in s.
+func (r Rectangle52_12) In(s Rectangle52_12) bool {
+	if r.Empty() {
+		return true
+	}
+	// Note that r.Max is an exclusive bound for r, so that r.In(s)
+	// does not require that r.Max.In(s).
+	return s.Min.X <= r.Min.X && r.Max.X <= s.Max.X &&
+		s.Min.Y <= r.Min.Y && r.Max.Y <= s.Max.Y
+}
diff --git a/server/vendor/modules.txt b/server/vendor/modules.txt
index 8215e6b75..59a0045fe 100644
--- a/server/vendor/modules.txt
+++ b/server/vendor/modules.txt
@@ -134,6 +134,9 @@ github.com/evanw/esbuild/internal/runtime
 github.com/evanw/esbuild/internal/sourcemap
 github.com/evanw/esbuild/internal/xxhash
 github.com/evanw/esbuild/pkg/api
+# github.com/fogleman/gg v1.3.0
+## explicit
+github.com/fogleman/gg
 # github.com/fsnotify/fsnotify v1.5.3
 ## explicit; go 1.13
 github.com/fsnotify/fsnotify
@@ -205,6 +208,10 @@ github.com/golang-sql/civil
 # github.com/golang-sql/sqlexp v0.1.0
 ## explicit; go 1.16
 github.com/golang-sql/sqlexp
+# github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
+## explicit
+github.com/golang/freetype/raster
+github.com/golang/freetype/truetype
 # github.com/golang/mock v1.6.0
 ## explicit; go 1.11
 github.com/golang/mock/gomock
@@ -485,6 +492,11 @@ golang.org/x/crypto/ssh/terminal
 ## explicit; go 1.12
 golang.org/x/image/bmp
 golang.org/x/image/ccitt
+golang.org/x/image/draw
+golang.org/x/image/font
+golang.org/x/image/font/basicfont
+golang.org/x/image/math/f64
+golang.org/x/image/math/fixed
 golang.org/x/image/tiff
 golang.org/x/image/tiff/lzw
 # golang.org/x/net v0.0.0-20220722155237-a158d28d115b