mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 06:35:42 +00:00
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
|
|
* 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'];
|
|
|
|
let 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;
|