diff options
Diffstat (limited to 'tools/addon-sdk-1.3/packages/api-utils/lib/utils/thumbnail.js')
-rw-r--r-- | tools/addon-sdk-1.3/packages/api-utils/lib/utils/thumbnail.js | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/utils/thumbnail.js b/tools/addon-sdk-1.3/packages/api-utils/lib/utils/thumbnail.js new file mode 100644 index 0000000..d9012e1 --- /dev/null +++ b/tools/addon-sdk-1.3/packages/api-utils/lib/utils/thumbnail.js @@ -0,0 +1,76 @@ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (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.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Jetpack. + * + * The Initial Developer of the Original Code is + * the Mozilla Foundation. + * Portions created by the Initial Developer are Copyright (C) 2010 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * Irakli Gozalishvili <gozala@mozilla.com> (Original Author) + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +"use strict"; + +const { Cc, Ci, Cu } = require("chrome"); +const AppShellService = Cc["@mozilla.org/appshell/appShellService;1"]. + getService(Ci.nsIAppShellService); + +const NS = "http://www.w3.org/1999/xhtml"; +const COLOR = "rgb(255,255,255)"; + +/** + * Creates canvas element with a thumbnail of the passed window. + * @param {Window} window + * @returns {Element} + */ +function getThumbnailCanvasForWindow(window) { + let aspectRatio = 0.5625; // 16:9 + let thumbnail = AppShellService.hiddenDOMWindow.document + .createElementNS(NS, "canvas"); + thumbnail.mozOpaque = true; + thumbnail.width = Math.ceil(window.screen.availWidth / 5.75); + thumbnail.height = Math.round(thumbnail.width * aspectRatio); + let ctx = thumbnail.getContext("2d"); + let snippetWidth = window.innerWidth * .6; + let scale = thumbnail.width / snippetWidth; + ctx.scale(scale, scale); + ctx.drawWindow(window, window.scrollX, window.scrollY, snippetWidth, + snippetWidth * aspectRatio, COLOR); + return thumbnail; +} +exports.getThumbnailCanvasForWindow = getThumbnailCanvasForWindow; + +/** + * Creates Base64 encoded data URI of the thumbnail for the passed window. + * @param {Window} window + * @returns {String} + */ +exports.getThumbnailURIForWindow = function getThumbnailURIForWindow(window) { + return getThumbnailCanvasForWindow(window).toDataURL() +}; |