third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-globalCompositeOperation.html - Issue 2504773003: Support globalCompositeOperation in OffscreenCanvas

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Side by Side Diff: third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-globalCompositeOperation.html

Issue 2504773003: Support globalCompositeOperation in OffscreenCanvas (Closed)

Patch Set: better testing Created 4 years, 1 month ago

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	1 <!DOCTYPE html>

	2 <script src="../../resources/testharness.js"></script>

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

	4

	5 <script>

	6 test(function() {

	7 var width = 50;

	8 var height = 50;

	9 var offscreenCanvas1 = new OffscreenCanvas(width, height);

	10 var ctx1 = offscreenCanvas1.getContext('2d');

	11 var offscreenCanvas2 = new OffscreenCanvas(width, height);

	12 var ctx2 = offscreenCanvas2.getContext('2d');

	13

	14 ctx2.fillStyle = 'rgba(12, 34, 56, 255)';

	15 ctx2.fillRect(0, 0, 10, 10);

	16 ctx1.fillStyle = 'rgba(24, 68, 108, 255)';

	17 ctx1.fillRect(0, 0, width, height);

	18 ctx1.globalCompositeOperation = 'source-in';
	xlai (Olivia) 2016/11/18 15:16:26 Hmmm, I think it's more important to test this fun Hmmm, I think it's more important to test this function on worker rather than on main, isn't it?
	19 ctx1.drawImage(offscreenCanvas2, 0, 0);

	20

	21 var color = ctx1.getImageData(25, 25, 1, 1).data;

	22 assert_approx_equals(color[0], 0, 5);

	23 assert_approx_equals(color[1], 0, 5);

	24 assert_approx_equals(color[2], 0, 5);

	25 assert_approx_equals(color[3], 0, 5);

	26

	27 color = ctx1.getImageData(5, 5, 1, 1).data;

	28 assert_approx_equals(color[0], 12, 5);

	29 assert_approx_equals(color[1], 34, 5);

	30 assert_approx_equals(color[2], 56, 5);

	31 assert_approx_equals(color[3], 255, 5);

	32 }, 'Test globalCompositeOperation API on OffscreenCanvas');

	33

	34 </script>

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