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| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 <script src="../../resources/testharness.js"></script> |
| 3 <script src="../../resources/testharnessreport.js"></script> |
| 4 <script> |
| 5 async_test(t => { |
| 6 var channel = new MessageChannel(); |
| 7 var canvas = document.createElement('canvas'); |
| 8 canvas.width = canvas.height = 10; |
| 9 var offscreen = canvas.transferControlToOffscreen(); |
| 10 channel.port2.onmessage = function(message) { |
| 11 var ctx = message.data.getContext('2d'); |
| 12 ctx.fillStyle = '#0f0'; |
| 13 ctx.fillRect(0, 0, 10, 10); |
| 14 ctx.commit(); |
| 15 setTimeout(function() { // synchronization barrier to allow commit to propag
ate |
| 16 var canvas2 = document.createElement('canvas'); |
| 17 canvas2.width = canvas2.height = 10; |
| 18 var ctx2 = canvas2.getContext('2d'); |
| 19 ctx2.drawImage(canvas, 0, 0); |
| 20 var pixel = ctx2.getImageData(0, 0, 1, 1).data; |
| 21 t.step(function() { |
| 22 assert_array_equals(pixel, [0, 255, 0, 255]); |
| 23 }); |
| 24 t.done(); |
| 25 }, 0); |
| 26 } |
| 27 channel.port1.postMessage(offscreen, [offscreen]); |
| 28 }, "Verify that posting an OffscreenCanvas through a MessageChannel works as int
ended."); |
| 29 |
| 30 test(function() { |
| 31 var channel = new MessageChannel(); |
| 32 var canvas = document.createElement('canvas'); |
| 33 canvas.width = canvas.height = 10; |
| 34 var offscreen = canvas.transferControlToOffscreen(); |
| 35 channel.port2.onmessage = function() {}; |
| 36 assert_throws("DataCloneError", function() {channel.port1.postMessage(offscree
n)}); |
| 37 }, "Verify that cloning an OffscreenCanvas through a MessageChannel throws an ex
ception") |
| 38 |
| 39 </script> |
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Chromium Code Reviews
Issue 2572793002:
Test OffscreenCanvas transfer via MessageChannel (Closed)
