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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/#offscreencanvas">
<script id="myWorker" type="text/worker">
function test1(offscreenCanvas)
{
return offscreenCanvas.width == 10 && offscreenCanvas.height == 10;
}
self.onmessage = function(e) {
switch(e.data.msg) {
case 'test1':
self.postMessage(test1(e.data.data));
break;
}
};
</script>
<script>
function makeWorker(script)
{
var blob = new Blob([script]);
return new Worker(URL.createObjectURL(blob));
}
async_test(function(t) {
var worker = makeWorker(document.getElementById("myWorker").textContent);
var offscreenCanvas = new OffscreenCanvas(10, 10);
worker.postMessage({msg: 'test1', data: offscreenCanvas}, [offscreenCanvas]);
worker.addEventListener('message', t.step_func_done(function(msg) {
assert_true(msg.data);
}));
assert_equals(offscreenCanvas.width, 0);
assert_equals(offscreenCanvas.height, 0);
}, "Test that offscreenCanvas's size is correct after being transferred to a worker.");
test(function() {
function testException(contextType) {
var worker = makeWorker(document.getElementById("myWorker").textContent);
var offscreenCanvas = new OffscreenCanvas(10, 10);
var ctx = offscreenCanvas.getContext(contextType);
assert_throws_dom("InvalidStateError", function() {
worker.postMessage({offscreenCanvas}, [offscreenCanvas]);
});
}
testException('2d');
}, "Test that transfer an OffscreenCanvas that already have a 2d context throws exception.");
test(function() {
var worker = makeWorker(document.getElementById("myWorker").textContent);
var offscreenCanvas = new OffscreenCanvas(10, 10);
worker.postMessage({offscreenCanvas}, [offscreenCanvas]);
assert_throws_dom("DataCloneError", function() {
worker.postMessage({offscreenCanvas}, [offscreenCanvas]);
});
}, "Test that transfer an OffscreenCanvas twice throws exception.");
test(function() {
var worker = makeWorker(document.getElementById("myWorker").textContent);
var offscreenCanvas = new OffscreenCanvas(10, 10);
worker.postMessage({offscreenCanvas}, [offscreenCanvas]);
assert_throws_dom("InvalidStateError", function() {
offscreenCanvas.getContext('2d');
});
}, "Test that calling getContext('2d') on a detached OffscreenCanvas throws exception.");
test(function() {
var worker = makeWorker(document.getElementById("myWorker").textContent);
var offscreenCanvas = new OffscreenCanvas(10, 10);
worker.postMessage({offscreenCanvas}, [offscreenCanvas]);
assert_throws_dom("InvalidStateError", function() {
offscreenCanvas.getContext('webgl');
});
}, "Test that calling getContext('webgl') on a detached OffscreenCanvas throws exception.");
</script>
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