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<!DOCTYPE HTML>
<html>
<head>
<title>OffscreenCanvas: Test neutering</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
</head>
<body>
<canvas id="c" width="64" height="64"></canvas>
<script>
SimpleTest.waitForExplicitFinish();
function runTest() {
var htmlCanvas = document.getElementById("c");
var worker = new Worker("offscreencanvas_neuter.js");
ok(htmlCanvas, "Should have HTML canvas element");
ok(worker, "Web worker successfully created");
ok(htmlCanvas.transferControlToOffscreen, "HTMLCanvasElement has transferControlToOffscreen function");
var offscreenCanvas = htmlCanvas.transferControlToOffscreen();
ok(offscreenCanvas, "Expected transferControlToOffscreen to succeed");
/* check html canvas is neuterd */
is(htmlCanvas.width, 64, "HTML canvas has correct width");
SimpleTest.doesThrow(
function() { htmlCanvas.width = 128; },
"Can't change html canvas' width after transferControlToOffscreen");
SimpleTest.doesThrow(
function() { htmlCanvas.height = 128; },
"Can't change html canvas' height after transferControlToOffscreen");
ok(!htmlCanvas.getContext("2d"), "Can't getContext after transferControlToOffscreen");
ok(!htmlCanvas.getContext("webgl"), "Can't getContext after transferControlToOffscreen");
ok(!htmlCanvas.getContext("webgl2"), "Can't getContext after transferControlToOffscreen");
worker.postMessage(offscreenCanvas, [offscreenCanvas]);
/* check parent offscreencanvas is neutered after being transfered */
SimpleTest.doesThrow(
function() { offscreenCanvas.width = 128; },
"Can't change transfered worker canvas width");
SimpleTest.doesThrow(
function() { offscreenCanvas.height = 128; },
"Can't change transfered worker canvas height");
SimpleTest.doesThrow(
function() { offscreenCanvas.getContext("2d") },
"Can't getContext on transfered worker canvas");
SimpleTest.doesThrow(
function() { offscreenCanvas.getContext("webgl") },
"Can't getContext on transfered worker canvas");
SimpleTest.doesThrow(
function() { offscreenCanvas.getContext("webgl2") },
"Can't getContext on transfered worker canvas");
// Transfer a neutered offscreencanvas should be ok.
worker.postMessage(offscreenCanvas, [offscreenCanvas]);
worker.terminate();
SimpleTest.finish();
}
SpecialPowers.pushPrefEnv({'set': [
['gfx.offscreencanvas.enabled', true],
['webgl.force-enabled', true],
]}, runTest);
</script>
</body>
</html>
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