LayoutTests/webgl/draw-webgl-to-context2d-memory-test.html

<html>
<head>
<meta charset="utf-8">
<title>WebGL Canvas to Context2D Canvas Memory Test</title>
<link rel="stylesheet" href="resources/webgl_test_files/resources/js-test-style.css"/>
<script src="resources/webgl_test_files//js/js-test-pre.js"></script>
<script src="resources/webgl_test_files//js/webgl-test-utils.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<canvas id="canvas2d" width="40" height="40"></canvas>
<script>
"use strict";
description("This test checking that drawing WebGL canvas to Context2D canvas with drawImage does not use unbounded amount of memory.");
var wtu = WebGLTestUtils;
var canvas2d = document.getElementById("canvas2d");
var ctx2d = canvas2d.getContext("2d");
var canvasWebGL = document.createElement("canvas");
canvasWebGL.width = 4000;
canvasWebGL.height = 4000;
var gl = wtu.create3DContext(canvasWebGL);
if (!gl) {
    testFailed("context does not exist");
} else {
    gl.clearColor(0.25, 0.5, 0.75, 1);
    for (var count = 0; count < 25; count++) {
        ctx2d.clearRect(0, 0, canvas2d.width, canvas2d.height);
        gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
        ctx2d.drawImage(canvasWebGL, 0, 0, canvas2d.width, canvas2d.height);
        wtu.checkCanvasRect(ctx2d, 0, 0, canvas2d.width, canvas2d.height, [64, 128, 192, 255], "drawImage: Should be [64, 128, 192, 255]", 2);
    }
    wtu.glErrorShouldBe(gl, gl.NO_ERROR);
    debug("");
    finishTest();
}
</script>
</body>
</html>