| <!DOCTYPE html> |
| <html> |
| <body> |
| <canvas id="canvas" width="1" height="1"></canvas> |
| <script src="../../resources/js-test.js"></script> |
| <script> |
| jsTestIsAsync = true; |
| var worker = new Worker('./resources/worker-onmessage-noop.js'); |
| |
| description("Tests how putImageData and createImageBitmap would react when the source data is detached"); |
| |
| var imageWidth = 1; |
| var imageHeight = 1; |
| var arrBuffer = new Uint8ClampedArray(new ArrayBuffer(4)); |
| arrBuffer[0] = 255; |
| arrBuffer[1] = 0; |
| arrBuffer[2] = 0; |
| arrBuffer[3] = 255; |
| var image = new ImageData(arrBuffer, imageWidth, imageHeight); |
| var context = document.getElementById("canvas").getContext("2d"); |
| |
| var len = image.data.byteLength; |
| shouldBe("len", "4"); |
| shouldBe("image.data[0]", "255"); |
| shouldBe("image.data[1]", "0"); |
| shouldBe("image.data[2]", "0"); |
| shouldBe("image.data[3]", "255"); |
| |
| context.putImageData(image, 0, 0); |
| var newImage = context.getImageData(0, 0, 1, 1); |
| shouldBe("newImage.data[0]", "255"); |
| shouldBe("newImage.data[1]", "0"); |
| shouldBe("newImage.data[2]", "0"); |
| shouldBe("newImage.data[3]", "255"); |
| |
| // transfer the array buffer to the worker so that the source data is now detached |
| worker.postMessage({data: image.data.buffer}, [image.data.buffer]); |
| |
| len = image.data.byteLength; |
| shouldBe("len", "0"); |
| shouldBe("image.data[0]", "undefined"); |
| shouldBe("image.data[1]", "undefined"); |
| shouldBe("image.data[2]", "undefined"); |
| shouldBe("image.data[3]", "undefined"); |
| |
| shouldThrow("context.putImageData(image, 0, 0)"); |
| |
| createImageBitmap(image).then(function() { |
| testFailed('Promise resolved unexpectedly'); |
| finishJSTest(); |
| }, function(err) { |
| testPassed('Promise rejected as expected: ' + err); |
| finishJSTest(); |
| }); |
| |
| </script> |
| </body> |
| </html> |
