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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="help" href="https://html.spec.whatwg.org/#offscreencontext2d-commit">
<script id="myWorker" type="text/worker">
function testCommitPushesContents(offscreenCanvas) {
try {
var ctx = offscreenCanvas.getContext('2d');
ctx.fillStyle = "#0f0";
ctx.fillRect(0, 0, 10, 10);
ctx.commit();
return true;
} catch(e) {
return false;
}
}
function testCommitException() {
var offscreenCanvas = new OffscreenCanvas(10, 10);
var ctx = offscreenCanvas.getContext('2d');
ctx.fillStyle = "#0f0";
ctx.fillRect(0, 0, 10, 10);
return true;
}
self.onmessage = function(e) {
switch (e.data.msg) {
case 'test1':
self.postMessage(testCommitPushesContents(e.data.data));
break;
case 'test2':
self.postMessage(testCommitException());
break;
}
};
</script>
<script>
function verifyPlaceholder(placeholder) {
var canvas = document.createElement('canvas');
canvas.width = canvas.height = 10;
var ctx = canvas.getContext('2d');
ctx.drawImage(placeholder, 0, 0);
_assertPixel(canvas, 5,5, 0,255,0,255, "5,5", "0,255,0,255");
}
function makeWorker(test) {
var blob = new Blob([document.getElementById("myWorker").textContent]);
var worker = new Worker(URL.createObjectURL(blob));
worker.onerror = test.unreached_func("error");
return worker;
}
async_test(function(t) {
var placeholder = document.createElement('canvas');
placeholder.width = placeholder.height = 10;
var offscreenCanvas = placeholder.transferControlToOffscreen();
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func_done(function(msg) {
assert_true(msg.data);
verifyPlaceholder(placeholder);
}));
worker.postMessage({msg: 'test1', data: offscreenCanvas}, [offscreenCanvas]);
}, "Test that calling OffscreenCanvas's commit pushes its contents to its placeholder.");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func_done(function(msg) {
assert_true(msg.data);
}));
worker.postMessage({msg: 'test2'});
}, "Test that calling commit on an OffscreenCanvas that is not transferred from a HTMLCanvasElement throws an exception in a worker.");
</script>
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