1 <!DOCTYPE html> 2 <html> 3 <body> 4 <script src="../resources/runner.js"></script> 5 <script> 6 var sourceCanvas2D = document.createElement("canvas"); 7 var sourceCtx2D = sourceCanvas2D.getContext("2d"); 8 var destCanvas2D = document.createElement("canvas"); 9 var destCtx2D = destCanvas2D.getContext("2d"); 10 var MEASURE_DRAW_TIMES = 1000; 11 var MAX_COUNT = 60000; 12 var count = 0; 13 14 function setSize(sourceWidth, sourceHeight, destWidth, destHeight) { 15 sourceCanvas2D.width = sourceWidth; 16 sourceCanvas2D.height = sourceHeight; 17 destCanvas2D.width = destWidth; 18 destCanvas2D.height = destHeight; 19 } 20 21 function rand(range) { 22 return Math.floor(Math.random() * range); 23 } 24 25 function fillCanvas(ctx2d, canvas2d) { 26 ctx2d.fillStyle = "rgba(" + rand(255) + "," + rand(255) + "," + rand(255) + "," + rand(255) + ")"; 27 ctx2d.fillRect(0, 0, canvas2d.width, canvas2d.height); 28 } 29 30 function drawCanvas2DToCanvas2D() { 31 var start = PerfTestRunner.now(); 32 for (var i = 0; i < MEASURE_DRAW_TIMES; i++) { 33 // draw static Canvas 34 destCtx2D.drawImage(sourceCanvas2D, 0, 0); 35 } 36 // Calling getImageData() is just to flush out the content when 37 // accelerated 2D canvas is in use. The cost of reading 1x1 pixels is low. 38 destCtx2D.getImageData(0, 0, 1, 1); 39 count++; 40 41 var elapsedTime = PerfTestRunner.now() - start; 42 PerfTestRunner.measureValueAsync(MEASURE_DRAW_TIMES * 1000 / elapsedTime); 43 if (count < MAX_COUNT) 44 requestAnimationFrame(drawCanvas2DToCanvas2D); 45 } 46 47 function onCompletedRun() { 48 count = MAX_COUNT; 49 } 50 51 window.onload = function () { 52 PerfTestRunner.prepareToMeasureValuesAsync({done: onCompletedRun, unit: 'runs/s', 53 description: "This bench test checks the speed on drawing static 2d Canvas(1024x1024) to HW accelerated Canvas2D(1024x1024)."}); 54 // It should use setMinimumAccelerated2dCanvasSize() to enable accelerated Canvas for a specified size 55 // but this API is not available in JS or WebPage. Assume the threshold size is 256x257 56 // and the dest canvas is HW accelerated Canvas when setting its size to 1024x1024. 57 setSize(1024, 1024, 1024, 1024); 58 fillCanvas(sourceCtx2D, sourceCanvas2D); 59 drawCanvas2DToCanvas2D(); 60 } 61 62 </script> 63 </body> 64 </html> 65
