| Index: third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-placeholder-image-source.html
|
| diff --git a/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-placeholder-image-source.html b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-placeholder-image-source.html
|
| new file mode 100644
|
| index 0000000000000000000000000000000000000000..fa2b295fb74d1c7558c350df7838137e270c1a59
|
| --- /dev/null
|
| +++ b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-placeholder-image-source.html
|
| @@ -0,0 +1,48 @@
|
| +<!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>
|
| +var t = async_test("Test that using a placeholder canvas as a source image accesses the image that was committed to the associated OffscreenCanvas.");
|
| +var canvas = document.createElement('canvas');
|
| +canvas.width = 100;
|
| +canvas.height = 100;
|
| +var offscreen = canvas.transferControlToOffscreen();
|
| +
|
| +var ctx = offscreen.getContext('2d');
|
| +ctx.fillStyle = '#0f0';
|
| +ctx.fillRect(0, 0, 100, 100);
|
| +ctx.commit();
|
| +verifyImage(canvas, [0, 0, 0, 0], "Verify that OffscreenCanvas.commit() does not propagate the image synchronously to the placeholder canvas.");
|
| +
|
| +setTimeout(function() {
|
| + // setTimeout is a synchronization barrier that guarantees
|
| + // that the offscreen commit has been processed by the event loop,
|
| + // as long as the timeout event is queued after the call to commit().
|
| + var green = [0, 255, 0, 255];
|
| + verifyImage(canvas, green, "verify that drawImage works with placeholder canvas as a source.");
|
| + var testImage = new Image();
|
| + testImage.src = canvas.toDataURL();
|
| + testImage.onload = function() {
|
| + verifyImage(canvas, green, "verify that toDataURL works on placeholder canvas.");
|
| + canvas.toBlob(blob => {
|
| + createImageBitmap(blob).then(image => {
|
| + verifyImage(image, green, "verify that toBlob works on placeholder canvas.");
|
| + t.done();
|
| + })
|
| + });
|
| + }
|
| +}, 0);
|
| +
|
| +function verifyImage(image, expectedColor, 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, expectedColor, description);
|
| + });
|
| +}
|
| +</script>
|
|
|
Chromium Code Reviews
Issue 2493673002:
Synchronize OffscreenCanvas content with the placeholder canvas (Closed)
