Merge pull request #3008 from matrix-org/matthew/fontmanager

load twemoji dynamically as colr or sbix; fix monospace

src/components/structures/LoggedInView.js

@@ -24,6 +24,7 @@ import { DragDropContext } from 'react-beautiful-dnd';
 import { KeyCode, isOnlyCtrlOrCmdKeyEvent } from '../../Keyboard';
 import PageTypes from '../../PageTypes';
 import CallMediaHandler from '../../CallMediaHandler';
+import { fixupColorFonts } from '../../utils/FontManager';
 import sdk from '../../index';
 import dis from '../../dispatcher';
 import sessionStore from '../../stores/SessionStore';
@@ -118,6 +119,8 @@ const LoggedInView = React.createClass({
         this._matrixClient.on("accountData", this.onAccountData);
         this._matrixClient.on("sync", this.onSync);
         this._matrixClient.on("RoomState.events", this.onRoomStateEvents);
+
+        fixupColorFonts();
     },
 
     componentDidUpdate(prevProps) {

src/utils/FontManager.js

@@ -0,0 +1,89 @@
+/*
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/*
+ * Based on...
+ * ChromaCheck 1.16
+ * author Roel Nieskens, https://pixelambacht.nl
+ * MIT license
+ */
+
+let colrFontSupported = undefined;
+
+async function isColrFontSupported() {
+    if (colrFontSupported !== undefined) {
+        return colrFontSupported;
+    }
+
+    // Firefox has supported COLR fonts since version 26
+    // but doesn't support the check below with content blocking enabled.
+    if (navigator.userAgent.includes("Firefox")) {
+        return true;
+    }
+
+    try {
+        const canvas = document.createElement('canvas');
+        const context = canvas.getContext('2d');
+        const img = new Image();
+        // eslint-disable-next-line
+        const fontCOLR = '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';
+        const svg = `
+        <svg xmlns="http://www.w3.org/2000/svg" width="20" height="100" style="background:#fff;fill:#000;">
+            <style type="text/css">
+                @font-face {
+                    font-family: "chromacheck-colr";
+                    src: url(data:application/x-font-woff;base64,${fontCOLR}) format("woff");
+                }
+            </style>
+            <text x="0" y="0" font-size="20">
+                <tspan font-family="chromacheck-colr" x="0" dy="20">&#xe900;</tspan>
+            </text>
+        </svg>`;
+        canvas.width = 20;
+        canvas.height = 100;
+
+        img.src = 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(svg);
+
+        // FIXME wait for safari load our colr font
+        const wait = ms => new Promise((r, j)=>setTimeout(r, ms));
+        await wait(500);
+
+        context.drawImage(img, 0, 0);
+        colrFontSupported = (context.getImageData(10, 10, 1, 1).data[0] === 200);
+    } catch (e) {
+        console.error("Couldn't load colr font", e);
+        colrFontSupported = false;
+    }
+    return colrFontSupported;
+}
+
+export async function fixupColorFonts() {
+    if (colrFontSupported !== undefined) {
+        return;
+    }
+
+    // we programatically add the right fontface.
+    let font;
+    if (await isColrFontSupported()) {
+        font = new FontFace("Twemoji",
+            `url('${require("../../res/fonts/Twemoji_Mozilla/TwemojiMozilla-colr.woff2")}')`, {});
+    } else {
+        font = new FontFace("Twemoji",
+            `url('${require("../../res/fonts/Twemoji_Mozilla/TwemojiMozilla-sbix.woff2")}')`, {});
+    }
+    document.fonts.add(font);
+}
+