| Index: third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-placeholder-image-source-with-worker.html
|
| diff --git a/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-placeholder-image-source-with-worker.html b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-placeholder-image-source-with-worker.html
|
| new file mode 100644
|
| index 0000000000000000000000000000000000000000..642b0a4d1f42a92c1ca73ff70bb9871e7de48434
|
| --- /dev/null
|
| +++ b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-placeholder-image-source-with-worker.html
|
| @@ -0,0 +1,55 @@
|
| +<!DOCTYPE html>
|
| +<title>Test using a placeholder canvas as an image source.</title>
|
| +<script src="../../resources/testharness.js"></script>
|
| +<script src="../../resources/testharnessreport.js"></script>
|
| +
|
| +<script id='myWorker' type='text/worker'>
|
| +var ctx;
|
| +self.onmessage = function(msg) {
|
| + ctx = msg.data.getContext('2d');
|
| + ctx.fillStyle = '#0f0';
|
| + ctx.fillRect(0, 0, 100, 100);
|
| + ctx.commit();
|
| +
|
| + self.postMessage("done");
|
| +};
|
| +</script>
|
| +
|
| +<script>
|
| +var t = async_test("Test that using a placeholder canvas as a source image accesses the image that was committed to the associated OffscreenCanvas in a worker.");
|
| +var canvas = document.createElement('canvas');
|
| +canvas.width = 100;
|
| +canvas.height = 100;
|
| +var offscreen = canvas.transferControlToOffscreen();
|
| +
|
| +var blob = new Blob([document.getElementById('myWorker').textContent]);
|
| +var worker = new Worker(URL.createObjectURL(blob));
|
| +worker.postMessage(offscreen, [offscreen]);
|
| +worker.addEventListener('message', msg => {
|
| + // the message is a synchronization barrier that guarantees
|
| + // that the offscreen commit has been processed on the worker thread.
|
| + verifyImage(canvas, "verify that drawImage works with placeholder canvas as a source.");
|
| + var testImage = new Image();
|
| + testImage.src = canvas.toDataURL();
|
| + testImage.onload = function() {
|
| + verifyImage(canvas, "verify that toDataURL works on placeholder canvas.");
|
| + canvas.toBlob(blob => {
|
| + createImageBitmap(blob).then(image => {
|
| + verifyImage(image, "verify that toBlob works on placeholder canvas.");
|
| + t.done();
|
| + })
|
| + });
|
| + }
|
| +});
|
| +
|
| +function verifyImage(image, description) {
|
| + var testCanvas = document.createElement('canvas');
|
| + var testCtx = testCanvas.getContext('2d');
|
| + testCtx.drawImage(image, 0, 0);
|
| +
|
| + t.step(function() {
|
| + var pixel = testCtx.getImageData(50, 50, 1, 1).data;
|
| + assert_array_equals(pixel, [0, 255, 0, 255], description);
|
| + });
|
| +}
|
| +</script>
|
|
|
Chromium Code Reviews
Issue 2493673002:
Synchronize OffscreenCanvas content with the placeholder canvas (Closed)
