third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-2d-drawImage-noContext.html - Issue 2550443002: Fix a minor issue in OffscreenCanvas.drawImage

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Side by Side Diff: third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-2d-drawImage-noContext.html

Issue 2550443002: Fix a minor issue in OffscreenCanvas.drawImage (Closed)

Patch Set: Created 4 years ago

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	1 <!DOCTYPE HTML>
	Justin Novosad 2016/12/01 19:39:57 Nit: the file name should be ...-no-context rather Nit: the file name should be ...-no-context rather than ...-noContext
	2 <script src="../../resources/testharness.js"></script>

	3 <script src="../../resources/testharnessreport.js"></script>

	4 <script>

	5 test(function() {

	6 var offscreenCanvas = new OffscreenCanvas(100, 50);

	7 var ctx = offscreenCanvas.getContext('2d');

	8 ctx.fillStyle = "#0f0";

	9 ctx.fillRect(0, 0, 100, 50);

	10 ctx.globalCompositeOperation = 'copy';
	Justin Novosad 2016/12/01 19:39:57 Add a comment to explain why 'copy' is important f Add a comment to explain why 'copy' is important for distinguishing between drawing nothing and drawing transparent black.
	11

	12 var offscreenCanvas2 = new OffscreenCanvas(100, 50);

	13 ctx.drawImage(offscreenCanvas2, 0, 0);

	14

	15 var clr = ctx.getImageData(50, 25, 1, 1).data;

	16 assert_array_equals(clr, [0, 0, 0, 0]);

	17 }, 'Use OffscreenCanvas without a context as ImageSource should draw transparent black');

	18 </script>

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