| <!DOCTYPE html> |
| <html> |
| <body> |
| <canvas id="canvas" width="3" height="2"></canvas> |
| <script src="../../resources/js-test.js"></script> |
| <script> |
| jsTestIsAsync = true; |
| var worker = new Worker('./resources/canvas-ImageBitmap-transferable.js'); |
| |
| description("Tests that ImageBitmap is transferable and that the pixel data survives the trip, as well as createImageBitmap(ImageBitmap) works on worker thread"); |
| |
| var imageWidth = 3; |
| var imageHeight = 2; |
| var bitmapWidth; |
| var bitmapHeight; |
| var newImage; |
| var newImageBitmap; |
| var image = new ImageData(new Uint8ClampedArray( |
| [255, 0, 0, 255, |
| 0, 255, 0, 255, |
| 255, 255, 255, 127, |
| 0, 0, 0, 64, |
| 12, 34, 56, 64, |
| 12, 34, 56, 127]), |
| imageWidth, imageHeight); |
| var context = document.getElementById("canvas").getContext("2d"); |
| |
| createImageBitmap(image).then(imageBitmap => { |
| bitmapWidth = imageBitmap.width; |
| bitmapHeight = imageBitmap.height; |
| shouldBe("bitmapWidth", "imageWidth"); |
| shouldBe("bitmapHeight", "imageHeight"); |
| |
| worker.postMessage({data: imageBitmap}, [imageBitmap]); |
| |
| // ImageBitmap has been transferred to worker, main thread loses ownership |
| // of it, so the width and height should be 0 now. |
| bitmapWidth = imageBitmap.width; |
| bitmapHeight = imageBitmap.height; |
| shouldBe("bitmapWidth", "0"); |
| shouldBe("bitmapHeight", "0"); |
| |
| newImageBitmap = imageBitmap; |
| // Test createImageBitmap from neutered ImageBitmap |
| createImageBitmap(imageBitmap).then(function() { |
| testFailed("Promise accepted, expected to be rejected"); |
| finishJSTest(); |
| }, () => { |
| testPassed("createImageBitmap from a neutered ImageBitmap was rejected"); |
| }); |
| |
| try { |
| worker.postMessage({data:imageBitmap}); |
| testFailed("Apply structured cloning succeed, expected to fail"); |
| } catch(e) { |
| testPassed("Apply structured cloning to a neutered ImageBitmap should throw an exception: " + e); |
| } |
| }); |
| |
| worker.onmessage = function(e) { |
| newImageBitmap = e.data.data; |
| bitmapWidth = newImageBitmap.width; |
| bitmapHeight = newImageBitmap.height; |
| |
| // Getting the ImageBitmap back from the worker thread |
| shouldBe("bitmapWidth", "imageWidth"); |
| shouldBe("bitmapHeight", "imageHeight"); |
| |
| context.drawImage(newImageBitmap, 0, 0); |
| newImage = context.getImageData(0, 0, imageWidth, imageHeight); |
| |
| // newImage is not necessary the same as imageData because of |
| // multiplying and dividing by alpha during the round trip, but |
| // they should be close. |
| // The alpha channel should be exactly the same. |
| shouldBeCloseTo("newImage.data[0]", "image.data[0]", 5); |
| shouldBeCloseTo("newImage.data[1]", "image.data[1]", 5); |
| shouldBeCloseTo("newImage.data[2]", "image.data[2]", 5); |
| shouldBe("newImage.data[3]", "image.data[3]"); |
| |
| shouldBeCloseTo("newImage.data[4]", "image.data[4]", 5); |
| shouldBeCloseTo("newImage.data[5]", "image.data[5]", 5); |
| shouldBeCloseTo("newImage.data[6]", "image.data[6]", 5); |
| shouldBe("newImage.data[7]", "image.data[7]"); |
| |
| shouldBeCloseTo("newImage.data[8]", "image.data[8]", 5); |
| shouldBeCloseTo("newImage.data[9]", "image.data[9]", 5); |
| shouldBeCloseTo("newImage.data[10]", "image.data[10]", 5); |
| shouldBe("newImage.data[11]", "image.data[11]"); |
| |
| shouldBeCloseTo("newImage.data[12]", "image.data[12]", 5); |
| shouldBeCloseTo("newImage.data[13]", "image.data[13]", 5); |
| shouldBeCloseTo("newImage.data[14]", "image.data[14]", 5); |
| shouldBe("newImage.data[15]", "image.data[15]"); |
| |
| shouldBeCloseTo("newImage.data[16]", "image.data[16]", 5); |
| shouldBeCloseTo("newImage.data[17]", "image.data[17]", 5); |
| shouldBeCloseTo("newImage.data[18]", "image.data[18]", 5); |
| shouldBe("newImage.data[19]", "image.data[19]"); |
| |
| shouldBeCloseTo("newImage.data[20]", "image.data[20]", 5); |
| shouldBeCloseTo("newImage.data[21]", "image.data[21]", 5); |
| shouldBeCloseTo("newImage.data[22]", "image.data[22]", 5); |
| shouldBe("newImage.data[23]", "image.data[23]"); |
| finishJSTest(); |
| } |
| |
| </script> |
| </body> |
| </html> |
