1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
<script src="../../../js/js-test-pre.js"></script>
<script src="../../../js/webgl-test-utils.js"></script>
</head>
<body>
<canvas id="c" width="16" height="16"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description('Tests canvas remains unchanged after it is used in webgl texutre');
debug("This is a regression test for <a href='https://bugs.chromium.org/p/chromium/issues/detail?id=446380'>Chromium Issue 446380</a>");
debug("");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("c", undefined, 2);
function checkSourceCanvasImageData(imageDataBefore, imageDataAfter) {
if (imageDataBefore.length != imageDataAfter.length) {
testFailed("The size of image data in source canvas become different after it is used in webgl texture.");
return;
}
for (var i = 0; i < imageDataAfter.length; i++) {
if (imageDataBefore[i] != imageDataAfter[i]) {
testFailed("Pixel values in source canvas have changed after canvas used in webgl texture.");
return;
}
}
testPassed("Pixel values in source canvas remain unchanged after canvas used in webgl texture.");
}
function runTest(width, height) {
var canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
var ctx = canvas.getContext("2d");
ctx.fillStyle = "rgba(1, 63, 127, 1)";
ctx.fillRect(0, 0, canvas.width, canvas.height);
var refCanvas = document.createElement("canvas");
refCanvas.width = width;
refCanvas.height = height;
var refCtx = refCanvas.getContext("2d");
refCtx.fillStyle = "rgba(1, 63, 127, 1)";
refCtx.fillRect(0, 0, canvas.width, canvas.height);
// A refCanvas with same data as canvas is used to get original image data, since
// getImageData may change hardware accelerated status of canvas and we don't want to
// omit testing for hardware accelerated canvas.
var imageDataBefore = refCtx.getImageData(0, 0, refCanvas.width, refCanvas.height);
var tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, canvas);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "TexImage2D should succeed");
checkSourceCanvasImageData(imageDataBefore, ctx.getImageData(0, 0, canvas.width, canvas.height));
gl.deleteTexture(tex);
}
runTest(2, 2);
runTest(257, 257);
finishTest();
</script>
</body>
</html>
|
