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1<!DOCTYPE html>
2<html>
3<body>
4<script src="../resources/runner.js"></script>
5<script>
6var sourceCanvas2D = document.createElement("canvas");
7var sourceCtx2D = sourceCanvas2D.getContext("2d");
8var destCanvas2D = document.createElement("canvas");
9var destCtx2D = destCanvas2D.getContext("2d");
10var MEASURE_DRAW_TIMES = 1000;
11var MAX_COUNT = 60000;
12var count = 0;
13
14function setSize(sourceWidth, sourceHeight, destWidth, destHeight) {
15    sourceCanvas2D.width = sourceWidth;
16    sourceCanvas2D.height = sourceHeight;
17    destCanvas2D.width = destWidth;
18    destCanvas2D.height = destHeight;
19}
20
21function rand(range) {
22    return Math.floor(Math.random() * range);
23}
24
25function fillCanvas(ctx2d, canvas2d) {
26    ctx2d.fillStyle = "rgba(" + rand(255) + "," + rand(255) + "," + rand(255)  + "," + rand(255) + ")";
27    ctx2d.fillRect(0, 0, canvas2d.width, canvas2d.height);
28}
29
30function drawCanvas2DToCanvas2D() {
31    var start = PerfTestRunner.now();
32    for (var i = 0; i < MEASURE_DRAW_TIMES; i++) {
33        fillCanvas(sourceCtx2D, sourceCanvas2D);
34        // draw dynamic Canvas
35        destCtx2D.drawImage(sourceCanvas2D, 0, 0);
36    }
37    // Calling getImageData() is just to flush out the content when
38    // accelerated 2D canvas is in use. The cost of reading 1x1 pixels is low.
39    destCtx2D.getImageData(0, 0, 1, 1);
40    count++;
41
42    var elapsedTime = PerfTestRunner.now() - start;
43    PerfTestRunner.measureValueAsync(MEASURE_DRAW_TIMES * 1000 / elapsedTime);
44    if (count < MAX_COUNT)
45        requestAnimationFrame(drawCanvas2DToCanvas2D);
46}
47
48function onCompletedRun() {
49    count = MAX_COUNT;
50}
51
52window.onload = function () {
53    PerfTestRunner.prepareToMeasureValuesAsync({done: onCompletedRun, unit: 'runs/s',
54        description: "This bench test checks the speed on drawing dynamic 2d Canvas(1024x1024) to HW accelerated Canvas2D(1024x1024)."});
55    // It should use setMinimumAccelerated2dCanvasSize() to enable accelerated Canvas for a specified size
56    // but this API is not available in JS or WebPage. Assume the threshold size is 256x257
57    // and the dest canvas is HW accelerated Canvas when setting its size to 1024x1024.
58    setSize(1024, 1024, 1024, 1024);
59    fillCanvas(sourceCtx2D, sourceCanvas2D);
60    drawCanvas2DToCanvas2D();
61}
62
63</script>
64</body>
65</html>
66