Add support for displaying images

9 files changed, 306 insertions, 5 deletions

diff --git a/ext/bg/search.html b/ext/bg/search.html
index eacc1893..fe88e264 100644
--- a/ext/bg/search.html
+++ b/ext/bg/search.html
@@ -85,6 +85,7 @@
         <script src="/mixed/js/display-context.js"></script>
         <script src="/mixed/js/display.js"></script>
         <script src="/mixed/js/display-generator.js"></script>
+        <script src="/mixed/js/media-loader.js"></script>
         <script src="/mixed/js/scroll.js"></script>
         <script src="/mixed/js/text-scanner.js"></script>
         <script src="/mixed/js/template-handler.js"></script>
diff --git a/ext/fg/float.html b/ext/fg/float.html
index 3ccf68eb..c8ea9b67 100644
--- a/ext/fg/float.html
+++ b/ext/fg/float.html
@@ -51,6 +51,7 @@
         <script src="/mixed/js/display-context.js"></script>
         <script src="/mixed/js/display.js"></script>
         <script src="/mixed/js/display-generator.js"></script>
+        <script src="/mixed/js/media-loader.js"></script>
         <script src="/mixed/js/scroll.js"></script>
         <script src="/mixed/js/template-handler.js"></script>
 
diff --git a/ext/mixed/css/display-dark.css b/ext/mixed/css/display-dark.css
index e4549bbf..acfa2782 100644
--- a/ext/mixed/css/display-dark.css
+++ b/ext/mixed/css/display-dark.css
@@ -94,3 +94,10 @@ h2 { border-bottom-color: #2f2f2f; }
 #term-pitch-accent-graph-dot-downstep>circle:last-of-type {
     fill: #ffffff;
 }
+
+.term-glossary-image-container {
+    background-color: #2f2f2f;
+}
+.term-glossary-image-container-overlay {
+    color: #888888;
+}
diff --git a/ext/mixed/css/display-default.css b/ext/mixed/css/display-default.css
index 7bcb1014..70f81eb6 100644
--- a/ext/mixed/css/display-default.css
+++ b/ext/mixed/css/display-default.css
@@ -94,3 +94,10 @@ h2 { border-bottom-color: #eeeeee; }
 #term-pitch-accent-graph-dot-downstep>circle:last-of-type {
     fill: #000000;
 }
+
+.term-glossary-image-container {
+    background-color: #eeeeee;
+}
+.term-glossary-image-container-overlay {
+    color: #777777;
+}
diff --git a/ext/mixed/css/display.css b/ext/mixed/css/display.css
index d1a54064..ca1fa371 100644
--- a/ext/mixed/css/display.css
+++ b/ext/mixed/css/display.css
@@ -611,6 +611,102 @@ button.action-button {
     stroke-width: 5;
 }
 
+.term-glossary-image-container {
+    display: inline-block;
+    white-space: nowrap;
+    max-width: 100%;
+    position: relative;
+    vertical-align: top;
+    line-height: 0;
+    font-size: 0.07142857em; /* 14px => 1px */
+    overflow: hidden;
+}
+
+.term-glossary-image-link {
+    cursor: inherit;
+    color: inherit;
+}
+
+.term-glossary-image-link[href]:hover {
+    cursor: pointer;
+}
+
+.term-glossary-image-container-overlay {
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 100%;
+    height: 100%;
+    font-size: 14em; /* 1px => 14px; */
+    line-height: 1.42857143; /* 14px => 20px */
+    display: table;
+    table-layout: fixed;
+    white-space: normal;
+}
+
+.term-glossary-item[data-has-image=true][data-image-load-state=load-error] .term-glossary-image-container-overlay:after {
+    content: "Image failed to load";
+    display: table-cell;
+    width: 100%;
+    height: 100%;
+    vertical-align: middle;
+    text-align: center;
+    padding: 0.25em;
+}
+
+.term-glossary-image {
+    display: inline-block;
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 100%;
+    height: 100%;
+    vertical-align: top;
+    object-fit: contain;
+    border: none;
+    outline: none;
+}
+
+.term-glossary-image:not([src]) {
+    display: none;
+}
+
+.term-glossary-image[data-pixelated=true] {
+    image-rendering: auto;
+    image-rendering: -moz-crisp-edges;
+    image-rendering: -webkit-optimize-contrast;
+    image-rendering: pixelated;
+    image-rendering: crisp-edges;
+}
+
+.term-glossary-image-aspect-ratio-sizer {
+    content: "";
+    display: inline-block;
+    width: 0;
+    vertical-align: top;
+    font-size: 0;
+}
+
+.term-glossary-image-link-text:before {
+    content: "[";
+}
+
+.term-glossary-image-link-text:after {
+    content: "]";
+}
+
+:root[data-compact-glossaries=true] .term-glossary-image-container {
+    display: none;
+}
+
+:root:not([data-compact-glossaries=true]) .term-glossary-image-link-text {
+    display: none;
+}
+
+:root:not([data-compact-glossaries=true]) .term-glossary-image-description {
+    display: block;
+}
+
 
 /*
  * Kanji
diff --git a/ext/mixed/display-templates.html b/ext/mixed/display-templates.html
index 3baa8293..5ecf2240 100644
--- a/ext/mixed/display-templates.html
+++ b/ext/mixed/display-templates.html
@@ -35,6 +35,7 @@
 </li></template>
 <template id="term-definition-disambiguation-template"><span class="term-definition-disambiguation"></span></template>
 <template id="term-glossary-item-template"><li class="term-glossary-item"><span class="term-glossary-separator"> </span><span class="term-glossary"></span></li></template>
+<template id="term-glossary-item-image-template"><li class="term-glossary-item" data-has-image="true"><span class="term-glossary-separator"> </span><span class="term-glossary"><a class="term-glossary-image-link" target="_blank" rel="noreferrer noopener"><span class="term-glossary-image-container"><span class="term-glossary-image-aspect-ratio-sizer"></span><img class="term-glossary-image" alt="" /><span class="term-glossary-image-container-overlay"></span></span><span class="term-glossary-image-link-text">Image</span> </a><span class="term-glossary-image-description"></span></span></li></template>
 <template id="term-reason-template"><span class="term-reason"></span><span class="term-reason-separator"> </span></template>
 
 <template id="term-pitch-accent-static-template"><svg xmlns="http://www.w3.org/2000/svg" style="display: none;">
diff --git a/ext/mixed/js/display-generator.js b/ext/mixed/js/display-generator.js
index 0f991362..a2b2b139 100644
--- a/ext/mixed/js/display-generator.js
+++ b/ext/mixed/js/display-generator.js
@@ -22,7 +22,8 @@
  */
 
 class DisplayGenerator {
-    constructor() {
+    constructor({mediaLoader}) {
+        this._mediaLoader = mediaLoader;
         this._templateHandler = null;
         this._termPitchAccentStaticTemplateIsSetup = false;
     }
@@ -176,16 +177,30 @@ class DisplayGenerator {
         const onlyListContainer = node.querySelector('.term-definition-disambiguation-list');
         const glossaryContainer = node.querySelector('.term-glossary-list');
 
-        node.dataset.dictionary = details.dictionary;
+        const dictionary = details.dictionary;
+        node.dataset.dictionary = dictionary;
 
         this._appendMultiple(tagListContainer, this._createTag.bind(this), details.definitionTags);
         this._appendMultiple(onlyListContainer, this._createTermDisambiguation.bind(this), details.only);
-        this._appendMultiple(glossaryContainer, this._createTermGlossaryItem.bind(this), details.glossary);
+        this._appendMultiple(glossaryContainer, this._createTermGlossaryItem.bind(this), details.glossary, dictionary);
 
         return node;
     }
 
-    _createTermGlossaryItem(glossary) {
+    _createTermGlossaryItem(glossary, dictionary) {
+        if (typeof glossary === 'string') {
+            return this._createTermGlossaryItemText(glossary);
+        } else if (typeof glossary === 'object' && glossary !== null) {
+            switch (glossary.type) {
+                case 'image':
+                    return this._createTermGlossaryItemImage(glossary, dictionary);
+            }
+        }
+
+        return null;
+    }
+
+    _createTermGlossaryItemText(glossary) {
         const node = this._templateHandler.instantiate('term-glossary-item');
         const container = node.querySelector('.term-glossary');
         if (container !== null) {
@@ -194,6 +209,68 @@ class DisplayGenerator {
         return node;
     }
 
+    _createTermGlossaryItemImage(data, dictionary) {
+        const {path, width, height, preferredWidth, preferredHeight, title, description, pixelated} = data;
+
+        const usedWidth = (
+            typeof preferredWidth === 'number' ?
+            preferredWidth :
+            width
+        );
+        const aspectRatio = (
+            typeof preferredWidth === 'number' &&
+            typeof preferredHeight === 'number' ?
+            preferredWidth / preferredHeight :
+            width / height
+        );
+
+        const node = this._templateHandler.instantiate('term-glossary-item-image');
+        node.dataset.path = path;
+        node.dataset.dictionary = dictionary;
+        node.dataset.imageLoadState = 'not-loaded';
+
+        const imageContainer = node.querySelector('.term-glossary-image-container');
+        imageContainer.style.width = `${usedWidth}em`;
+        if (typeof title === 'string') {
+            imageContainer.title = title;
+        }
+
+        const aspectRatioSizer = node.querySelector('.term-glossary-image-aspect-ratio-sizer');
+        aspectRatioSizer.style.paddingTop = `${aspectRatio * 100.0}%`;
+
+        const image = node.querySelector('img.term-glossary-image');
+        const imageLink = node.querySelector('.term-glossary-image-link');
+        image.dataset.pixelated = `${pixelated === true}`;
+
+        if (this._mediaLoader !== null) {
+            this._mediaLoader.loadMedia(
+                path,
+                dictionary,
+                (url) => this._setImageData(node, image, imageLink, url, false),
+                () => this._setImageData(node, image, imageLink, null, true)
+            );
+        }
+
+        if (typeof description === 'string') {
+            const container = node.querySelector('.term-glossary-image-description');
+            this._appendMultilineText(container, description);
+        }
+
+        return node;
+    }
+
+    _setImageData(container, image, imageLink, url, unloaded) {
+        if (url !== null) {
+            image.src = url;
+            imageLink.href = url;
+            container.dataset.imageLoadState = 'loaded';
+        } else {
+            image.removeAttribute('src');
+            imageLink.removeAttribute('href');
+            container.dataset.imageLoadState = unloaded ? 'unloaded' : 'load-error';
+        }
+    }
+
     _createTermDisambiguation(disambiguation) {
         const node = this._templateHandler.instantiate('term-definition-disambiguation');
         node.dataset.term = disambiguation;
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index c2284ffe..9587ec3b 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -20,6 +20,7 @@
  * DOM
  * DisplayContext
  * DisplayGenerator
+ * MediaLoader
  * WindowScroll
  * apiAudioGetUri
  * apiBroadcastTab
@@ -62,7 +63,8 @@ class Display {
         this.clickScanPrevent = false;
         this.setContentToken = null;
 
-        this.displayGenerator = new DisplayGenerator();
+        this.mediaLoader = new MediaLoader();
+        this.displayGenerator = new DisplayGenerator({mediaLoader: this.mediaLoader});
         this.windowScroll = new WindowScroll();
 
         this._onKeyDownHandlers = new Map([
@@ -479,6 +481,8 @@ class Display {
         const token = {}; // Unique identifier token
         this.setContentToken = token;
         try {
+            this.mediaLoader.unloadAll();
+
             switch (type) {
                 case 'terms':
                     await this.setContentTerms(details.definitions, details.context, token);
diff --git a/ext/mixed/js/media-loader.js b/ext/mixed/js/media-loader.js
new file mode 100644
index 00000000..c89c4f12
--- /dev/null
+++ b/ext/mixed/js/media-loader.js
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2020  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* global
+ * apiGetMedia
+ */
+
+class MediaLoader {
+    constructor() {
+        this._token = {};
+        this._mediaCache = new Map();
+        this._loadMediaData = [];
+    }
+
+    async loadMedia(path, dictionaryName, onLoad, onUnload) {
+        const token = this.token;
+        const data = {onUnload, loaded: false};
+
+        this._loadMediaData.push(data);
+
+        const media = await this.getMedia(path, dictionaryName);
+        if (token !== this.token) { return; }
+
+        onLoad(media.url);
+        data.loaded = true;
+    }
+
+    unloadAll() {
+        for (const {onUnload, loaded} of this._loadMediaData) {
+            if (typeof onUnload === 'function') {
+                onUnload(loaded);
+            }
+        }
+        this._loadMediaData = [];
+
+        for (const map of this._mediaCache.values()) {
+            for (const {url} of map.values()) {
+                if (url !== null) {
+                    URL.revokeObjectURL(url);
+                }
+            }
+        }
+        this._mediaCache.clear();
+
+        this._token = {};
+    }
+
+    async getMedia(path, dictionaryName) {
+        let cachedData;
+        let dictionaryCache = this._mediaCache.get(dictionaryName);
+        if (typeof dictionaryCache !== 'undefined') {
+            cachedData = dictionaryCache.get(path);
+        } else {
+            dictionaryCache = new Map();
+            this._mediaCache.set(dictionaryName, dictionaryCache);
+        }
+
+        if (typeof cachedData === 'undefined') {
+            cachedData = {
+                promise: null,
+                data: null,
+                url: null
+            };
+            dictionaryCache.set(path, cachedData);
+            cachedData.promise = this._getMediaData(path, dictionaryName, cachedData);
+        }
+
+        return cachedData.promise;
+    }
+
+    async _getMediaData(path, dictionaryName, cachedData) {
+        const token = this._token;
+        const data = (await apiGetMedia([{path, dictionaryName}]))[0];
+        if (token === this._token && data !== null) {
+            const sourceArrayBuffer = this._base64ToArrayBuffer(data.source);
+            const blob = new Blob([sourceArrayBuffer], {type: data.mediaType});
+            const url = URL.createObjectURL(blob);
+            cachedData.data = data;
+            cachedData.url = url;
+        }
+        return cachedData;
+    }
+
+    _base64ToArrayBuffer(source) {
+        const binarySource = window.atob(source);
+        const length = binarySource.length;
+        const array = new Uint8Array(length);
+        for (let i = 0; i < length; ++i) {
+            array[i] = binarySource.charCodeAt(i);
+        }
+        return array.buffer;
+    }
+}