third_party/WebKit/PerformanceTests/Canvas/putImageData.html - Issue 2190523003: Fixing regression in putImageData blink perf test

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Issue 2190523003: Fixing regression in putImageData blink perf test (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Created 4 years, 4 months ago

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1 <!DOCTYPE html>	1 <!DOCTYPE html>

2 <html>	2 <html>

3 <body>	3 <body>

4 <script src="../resources/runner.js"></script>	4 <script src="../resources/runner.js"></script>

5 <script>	5 <script>

6

7 var canvas2D = document.createElement("canvas");	6 var canvas2D = document.createElement("canvas");

8 var ctx2D = canvas2D.getContext("2d");	7 var ctx2D = canvas2D.getContext("2d");

9 var imageData = null;	8 var imageData = null;

10	9 canvas2D.width = canvas2D.height = 1024;

11 function setSize(width, height) {	10 imageData = ctx2D.createImageData(canvas2D.width, canvas2D.height);
	xidachen 2016/07/28 01:17:59 If my understanding is correct, this imageData wil If my understanding is correct, this imageData will be transparent black. In that case, can we just do var imageData = new ImageData(canvas2d.width, canvas2d.height)? This will largely eliminate the overhead of this test.
12 canvas2D.width = width;

13 canvas2D.height = height;

14 }

15

16 function rand(range) {

17 return Math.floor(Math.random() * range);

18 }

19

20 function fillCanvas(ctx2d, canvas2d) {

21 ctx2d.fillStyle = "rgba(" + rand(255) + "," + rand(255) + "," + rand(255) + "," + rand(255) + ")";

22 ctx2d.fillRect(0, 0, canvas2d.width, canvas2d.height);

23 }

24	11

25 function putImageDataToCanvas2D() {	12 function putImageDataToCanvas2D() {

26 ctx2D.putImageData(imageData, 0, 0);	13 ctx2D.putImageData(imageData, 0, 0);

27 }	14 }

28	15

29 setSize(1024, 1024);

30 fillCanvas(ctx2D, canvas2D);

31 imageData = ctx2D.getImageData(0, 0, canvas2D.width, canvas2D.height);

32

33 PerfTestRunner.measureRunsPerSecond({run: putImageDataToCanvas2D, description: " This bench test checks the speed on putting ImageData to Canvas2D(1024x1024)."}) ;	16 PerfTestRunner.measureRunsPerSecond({run: putImageDataToCanvas2D, description: " This bench test checks the speed on putting ImageData to Canvas2D(1024x1024)."}) ;

34	17

35 </script>	18 </script>

36 </body>	19 </body>

37 </html>	20 </html>

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