44 lines
1.5 KiB
JavaScript
44 lines
1.5 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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'use strict';
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const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
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Cu.import('resource://gre/modules/XPCOMUtils.jsm');
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XPCOMUtils.defineLazyModuleGetter(this, "SystemAppProxy", "resource://gre/modules/SystemAppProxy.jsm");
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this.EXPORTED_SYMBOLS = ['Screenshot'];
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var Screenshot = {
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get: function screenshot_get() {
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let systemAppFrame = SystemAppProxy.getFrame();
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let window = systemAppFrame.ownerDocument.defaultView;
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let document = window.document;
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var canvas = document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas');
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var docRect = document.body.getBoundingClientRect();
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var width = docRect.width;
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var height = docRect.height;
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// Convert width and height from CSS pixels (potentially fractional)
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// to device pixels (integer).
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var scale = window.devicePixelRatio;
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canvas.setAttribute('width', Math.round(width * scale));
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canvas.setAttribute('height', Math.round(height * scale));
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var context = canvas.getContext('2d');
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var flags =
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context.DRAWWINDOW_DRAW_CARET |
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context.DRAWWINDOW_DRAW_VIEW |
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context.DRAWWINDOW_USE_WIDGET_LAYERS;
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context.scale(scale, scale);
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context.drawWindow(window, 0, 0, width, height, 'rgb(255,255,255)', flags);
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return canvas.mozGetAsFile('screenshot', 'image/png');
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}
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};
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this.Screenshot = Screenshot;
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