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: reset API layout tests 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 = '#ff0';

	15 ctx2.fillRect(0, 0, width, height);

	16 ctx1.fillStyle = '#0ff';

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

	18 ctx1.globalCompositeOperation = 'copy';

	19 ctx1.drawImage(offscreenCanvas2, 0, 0);

	20

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

	22

	23 assert_approx_equals(color[0], 255, 5);

	24 assert_approx_equals(color[1], 255, 5);

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

	26 assert_approx_equals(color[3], 255, 5);
	Justin Novosad 2016/11/17 19:34:24 This is not really a good test because the pixel v This is not really a good test because the pixel value would be the same if you did not set globalCompositeOperation (stayed in default source-over), so this does not really verify the effect. xidachen 2016/11/18 01:42:57 Done. Show quoted text On 2016/11/17 19:34:24, Justin Novosad wrote: > This is not really a good test because the pixel value would be the same if you > did not set globalCompositeOperation (stayed in default source-over), so this > does not really verify the effect. Done.
	27 }, 'Test globalCompositeOperation API on OffscreenCanvas');

	28

	29 </script>

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