The Tor Browser / file comparison
comparison: addon-sdk/source/lib/sdk/content/thumbnail.js
addon-sdk/source/lib/sdk/content/thumbnail.js
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
equal
deleted
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| -1:000000000000 | 0:dcb7c77fcaae |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 'use strict'; | |
| 5 | |
| 6 module.metadata = { | |
| 7 'stability': 'unstable' | |
| 8 }; | |
| 9 | |
| 10 const { Cc, Ci, Cu } = require('chrome'); | |
| 11 const AppShellService = Cc['@mozilla.org/appshell/appShellService;1']. | |
| 12 getService(Ci.nsIAppShellService); | |
| 13 | |
| 14 const NS = 'http://www.w3.org/1999/xhtml'; | |
| 15 const COLOR = 'rgb(255,255,255)'; | |
| 16 | |
| 17 /** | |
| 18 * Creates canvas element with a thumbnail of the passed window. | |
| 19 * @param {Window} window | |
| 20 * @returns {Element} | |
| 21 */ | |
| 22 function getThumbnailCanvasForWindow(window) { | |
| 23 let aspectRatio = 0.5625; // 16:9 | |
| 24 let thumbnail = AppShellService.hiddenDOMWindow.document | |
| 25 .createElementNS(NS, 'canvas'); | |
| 26 thumbnail.mozOpaque = true; | |
| 27 thumbnail.width = Math.ceil(window.screen.availWidth / 5.75); | |
| 28 thumbnail.height = Math.round(thumbnail.width * aspectRatio); | |
| 29 let ctx = thumbnail.getContext('2d'); | |
| 30 let snippetWidth = window.innerWidth * .6; | |
| 31 let scale = thumbnail.width / snippetWidth; | |
| 32 ctx.scale(scale, scale); | |
| 33 ctx.drawWindow(window, window.scrollX, window.scrollY, snippetWidth, | |
| 34 snippetWidth * aspectRatio, COLOR); | |
| 35 return thumbnail; | |
| 36 } | |
| 37 exports.getThumbnailCanvasForWindow = getThumbnailCanvasForWindow; | |
| 38 | |
| 39 /** | |
| 40 * Creates Base64 encoded data URI of the thumbnail for the passed window. | |
| 41 * @param {Window} window | |
| 42 * @returns {String} | |
| 43 */ | |
| 44 exports.getThumbnailURIForWindow = function getThumbnailURIForWindow(window) { | |
| 45 return getThumbnailCanvasForWindow(window).toDataURL() | |
| 46 }; |
