| <!DOCTYPE html> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/common/canvas-tests.js"></script> |
| <link rel="help" href="https://html.spec.whatwg.org/#dom-canvas-transfercontroltooffscreen"> |
| |
| <script id="myWorker" type="text/worker"> |
| |
| function testSize(offscreenCanvas) |
| { |
| if (offscreenCanvas.width == 100 && offscreenCanvas.height == 50) |
| return true; |
| return false; |
| } |
| |
| self.onmessage = function(e) { |
| switch (e.data.msg) { |
| case 'test1': |
| self.postMessage(testSize(e.data.data)); |
| break; |
| case 'test2': |
| self.postMessage(""); |
| break; |
| case 'test3': |
| self.postMessage(""); |
| break; |
| } |
| }; |
| |
| </script> |
| |
| <script> |
| function makeWorker(script) |
| { |
| var blob = new Blob([script]); |
| return new Worker(URL.createObjectURL(blob)); |
| } |
| |
| async_test(function(t) { |
| var placeholder = document.createElement('canvas'); |
| placeholder.width = 100; |
| placeholder.height = 50; |
| var offscreenCanvas = placeholder.transferControlToOffscreen(); |
| var worker = makeWorker(document.getElementById("myWorker").textContent); |
| worker.addEventListener('message', t.step_func_done(function(msg) { |
| assert_true(msg.data); |
| })); |
| worker.postMessage({msg: 'test1', data: offscreenCanvas}, [offscreenCanvas]); |
| }, "Test that an OffscreenCanvas generated by transferControlToOffscreen gets correct width and height when it is transferred to a worker"); |
| |
| async_test(function(t) { |
| var placeholder = document.createElement('canvas'); |
| placeholder.width = 100; |
| placeholder.height = 50; |
| var offscreenCanvas = placeholder.transferControlToOffscreen(); |
| var worker = makeWorker(document.getElementById("myWorker").textContent); |
| worker.addEventListener('message', t.step_func_done(function(msg) { |
| assert_throws("InvalidStateError", function() { placeholder.getContext('2d'); }); |
| })); |
| worker.postMessage({msg: 'test2', data: offscreenCanvas}, [offscreenCanvas]); |
| }, "Test that calling getContext on a placeholder canvas that is transferred its control to an OffscreenCanvas throws an exception, when the OffscreenCanvas is transferred to a worker"); |
| |
| async_test(function(t) { |
| var placeholder = document.createElement('canvas'); |
| placeholder.width = 100; |
| placeholder.height = 50; |
| var offscreenCanvas = placeholder.transferControlToOffscreen(); |
| var worker = makeWorker(document.getElementById("myWorker").textContent); |
| worker.addEventListener('message', t.step_func_done(function(msg) { |
| assert_throws("InvalidStateError", function() { placeholder.transferControlToOffscreen(); }); |
| })); |
| worker.postMessage({msg: 'test3', data: offscreenCanvas}, [offscreenCanvas]); |
| }, "Test that calling transferControlToOffscreen twice throws an exception, when its associated OffscreenCanvas is transferred to a worker"); |
| |
| </script> |
| |