third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-2d-globalAlpha.html - Issue 2526693003: Make OffscreenCanvas 2D context support globalAlpha

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

Issue 2526693003: Make OffscreenCanvas 2D context support globalAlpha (Closed)

Patch Set: clean up tests Created 4 years ago

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	1 <html>

	2 <body>

	3 <canvas id="canvas" width="600" height="100" ></canvas>

	4 <script>

	5 var canvas = document.getElementById("canvas");

	6 var context = canvas.getContext("2d");

	7

	8 var offscreenCanvas1 = new OffscreenCanvas(100, 100);

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

	10 ctx1.fillStyle = 'green';

	11 ctx1.fillRect(0, 0, 100, 100);

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

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

	14

	15 ctx2.globalAlpha = 0.0;

	16 ctx2.drawImage(offscreenCanvas1, 0, 0);

	17 context.drawImage(offscreenCanvas2, 0, 0, 100, 100, 0, 0, 100, 100);

	18

	19 ctx2.globalAlpha = 0.2;

	20 ctx2.drawImage(offscreenCanvas1, 0, 0);

	21 context.drawImage(offscreenCanvas2, 0, 0, 100, 100, 100, 0, 100, 100);

	22

	23 ctx2.globalAlpha = 0.4;

	24 ctx2.drawImage(offscreenCanvas1, 0, 0);

	25 context.drawImage(offscreenCanvas2, 0, 0, 100, 100, 200, 0, 100, 100);

	26

	27 ctx2.globalAlpha = 0.6;

	28 ctx2.drawImage(offscreenCanvas1, 0, 0);

	29 context.drawImage(offscreenCanvas2, 0, 0, 100, 100, 300, 0, 100, 100);

	30

	31 ctx2.globalAlpha = 0.8;

	32 ctx2.drawImage(offscreenCanvas1, 0, 0);

	33 context.drawImage(offscreenCanvas2, 0, 0, 100, 100, 400, 0, 100, 100);

	34

	35 ctx2.globalAlpha = 1.0;

	36 ctx2.drawImage(offscreenCanvas1, 0, 0);

	37 context.drawImage(offscreenCanvas2, 0, 0, 100, 100, 500, 0, 100, 100);

	38 </script>

	39 </body>

	40 </html>

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