third_party/WebKit/PerformanceTests/Canvas/getImageData.html

   1 <!DOCTYPE html>
   2 <html>
   3 <body>
   4 <script src="../resources/runner.js"></script>
   5 <script>
   6
   7 var canvas2D = document.createElement("canvas");
   8 var ctx2D = canvas2D.getContext("2d");
   9
  10 function setSize(width, height) {
  11     canvas2D.width = width;
  12     canvas2D.height = height;
  13 }
  14
  15 function rand(range) {
  16     return Math.floor(Math.random() * range);
  17 }
  18
  19 function fillCanvas(ctx2d, canvas2d) {
  20     ctx2d.fillStyle = "rgba(" + rand(255) + "," + rand(255) + "," + rand(255)  + "," + rand(255) + ")";
  21     ctx2d.fillRect(0, 0, canvas2d.width, canvas2d.height);
  22 }
  23
  24 function getImageDataFromCanvas2D() {
  25     ctx2D.getImageData(0, 0, canvas2D.width, canvas2D.height);
  26 }
  27
  28 setSize(1024, 1024);
  29 fillCanvas(ctx2D, canvas2D);
  30
  31 PerfTestRunner.measureRunsPerSecond({run: getImageDataFromCanvas2D, description: "This bench test checks the speed on getting ImageData from Canvas2D(1024x1024)."});
  32
  33 </script>
  34 </body>
  35 </html>