third_party/WebKit/ManualTests/canvas-ClearRect-hidpi.html - Issue 1983863002: Inflate dirty rect by 1 pixel on a high DPI display

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Side by Side Diff: third_party/WebKit/ManualTests/canvas-ClearRect-hidpi.html

Issue 1983863002: Inflate dirty rect by 1 pixel on a high DPI display (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: nullcheck on page() Created 4 years, 7 months ago

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	1 <!DOCTYPE html>

	2 <html>

	3 <body>

	4 <p>

	5 Test for crbug.com/609820. When running this test on Mac with retina display,

	6 the result should be a clear canvas with no artifact after a few seconds.

	7 </p>

	8 <canvas id='output' width='300' height='250'></canvas>

	9 <script>

	10 var repeat = 350;

	11 var x = y = 0;

	12 var canvas = document.getElementById("output");

	13 var ctx = canvas.getContext('2d');

	14 ctx.fillStyle = "#FF0000";

	15

	16 requestAnimationFrame(animate);

	17

	18 function animate()

	19 {

	20 ctx.clearRect(x, y, 50, 50);

	21 x++;

	22 y++;

	23 ctx.fillRect(x, y, 50, 50);

	24 repeat--;

	25 if (repeat > 0)

	26 requestAnimationFrame(animate);

	27 }

	28 </script>

	29 </body>

	30 </html>

	31

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