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| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 <title>Test using a placeholder canvas as an image source.</title> |
| 3 <script src="../../resources/testharness.js"></script> |
| 4 <script src="../../resources/testharnessreport.js"></script> |
| 5 |
| 6 <script id='myWorker' type='text/worker'> |
| 7 var ctx; |
| 8 self.onmessage = function(msg) { |
| 9 ctx = msg.data.getContext('2d'); |
| 10 ctx.fillStyle = '#0f0'; |
| 11 ctx.fillRect(0, 0, 100, 100); |
| 12 ctx.commit(); |
| 13 |
| 14 self.postMessage("done"); |
| 15 }; |
| 16 </script> |
| 17 |
| 18 <script> |
| 19 var t = async_test("Test that using a placeholder canvas as a source image acces
ses the image that was committed to the associated OffscreenCanvas in a worker."
); |
| 20 var canvas = document.createElement('canvas'); |
| 21 canvas.width = 100; |
| 22 canvas.height = 100; |
| 23 var offscreen = canvas.transferControlToOffscreen(); |
| 24 |
| 25 var blob = new Blob([document.getElementById('myWorker').textContent]); |
| 26 var worker = new Worker(URL.createObjectURL(blob)); |
| 27 worker.postMessage(offscreen, [offscreen]); |
| 28 worker.addEventListener('message', msg => { |
| 29 // the message is a synchronization barrier that guarantees |
| 30 // that the offscreen commit has been processed on the worker thread. |
| 31 verifyImage(canvas, "verify that drawImage works with placeholder canvas as a
source."); |
| 32 var testImage = new Image(); |
| 33 testImage.src = canvas.toDataURL(); |
| 34 testImage.onload = function() { |
| 35 verifyImage(canvas, "verify that toDataURL works on placeholder canvas."); |
| 36 canvas.toBlob(blob => { |
| 37 createImageBitmap(blob).then(image => { |
| 38 verifyImage(image, "verify that toBlob works on placeholder canvas."); |
| 39 t.done(); |
| 40 }) |
| 41 }); |
| 42 } |
| 43 }); |
| 44 |
| 45 function verifyImage(image, description) { |
| 46 var testCanvas = document.createElement('canvas'); |
| 47 var testCtx = testCanvas.getContext('2d'); |
| 48 testCtx.drawImage(image, 0, 0); |
| 49 |
| 50 t.step(function() { |
| 51 var pixel = testCtx.getImageData(50, 50, 1, 1).data; |
| 52 assert_array_equals(pixel, [0, 255, 0, 255], description); |
| 53 }); |
| 54 } |
| 55 </script> |
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Chromium Code Reviews
Issue 2493673002:
Synchronize OffscreenCanvas content with the placeholder canvas (Closed)
