diff options
author | Rogan Creswick <creswick@gmail.com> | 2013-01-02 15:31:43 -0800 |
---|---|---|
committer | Rogan Creswick <creswick@gmail.com> | 2013-01-02 15:31:43 -0800 |
commit | 91c8d16838b39c7726f6c0a0fb333f5ba38d2494 (patch) | |
tree | 136df17525e5e62f3ddc5b7a6dc71ffd31e2aa42 /tools/addon-sdk-1.12/lib/sdk/content/thumbnail.js | |
parent | f7b228c479bac8828e521a2826d7f57f150da877 (diff) |
updated addon-sdk to 1.12
Diffstat (limited to 'tools/addon-sdk-1.12/lib/sdk/content/thumbnail.js')
-rw-r--r-- | tools/addon-sdk-1.12/lib/sdk/content/thumbnail.js | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.12/lib/sdk/content/thumbnail.js b/tools/addon-sdk-1.12/lib/sdk/content/thumbnail.js new file mode 100644 index 0000000..9e57274 --- /dev/null +++ b/tools/addon-sdk-1.12/lib/sdk/content/thumbnail.js @@ -0,0 +1,46 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ +'use strict'; + +module.metadata = { + 'stability': 'unstable' +}; + +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() +}; |