| // Copyright 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| var backImageCanvas; |
| |
| function prepareBackground() { |
| var backImage = document.getElementById('backImage'); |
| backImageCanvas = document.createElement('canvas'); |
| backImageCanvas.width = canvasWidth; |
| backImageCanvas.height = canvasHeight; |
| var backContext = backImageCanvas.getContext('2d'); |
| backContext.drawImage(backImage, 0, 0, canvasWidth, canvasHeight); |
| } |
| |
| function drawBackground() { |
| canvasContext.drawImage(backImageCanvas, 0, 0); |
| } |