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/* 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';
const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
Cu.import('resource://gre/modules/XPCOMUtils.jsm');
XPCOMUtils.defineLazyModuleGetter(this, "SystemAppProxy", "resource://gre/modules/SystemAppProxy.jsm");
this.EXPORTED_SYMBOLS = ['Screenshot'];
var Screenshot = {
get: function screenshot_get() {
let systemAppFrame = SystemAppProxy.getFrame();
let window = systemAppFrame.ownerDocument.defaultView;
let document = window.document;
var canvas = document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas');
var docRect = document.body.getBoundingClientRect();
var width = docRect.width;
var height = docRect.height;
// Convert width and height from CSS pixels (potentially fractional)
// to device pixels (integer).
var scale = window.devicePixelRatio;
canvas.setAttribute('width', Math.round(width * scale));
canvas.setAttribute('height', Math.round(height * scale));
var context = canvas.getContext('2d');
var flags =
context.DRAWWINDOW_DRAW_CARET |
context.DRAWWINDOW_DRAW_VIEW |
context.DRAWWINDOW_USE_WIDGET_LAYERS;
context.scale(scale, scale);
context.drawWindow(window, 0, 0, width, height, 'rgb(255,255,255)', flags);
return canvas.mozGetAsFile('screenshot', 'image/png');
}
};
this.Screenshot = Screenshot;
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