dom/canvas/test/test_offscreencanvas_dynamic_fallback.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4 <title>WebGL in OffscreenCanvas</title>
   5 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   6 <script src="/tests/SimpleTest/WindowSnapshot.js"></script>
   7 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   8 </head>
   9 <body>
  10 <script>
  11
  12 SimpleTest.waitForExplicitFinish();
  13
  14 function createCanvas(initWithMask) {
  15   var canvas = document.createElement("canvas");
  16   canvas.width = 64;
  17   canvas.height = 64;
  18   document.body.appendChild(canvas);
  19   if (initWithMask) {
  20     canvas.style.mask = "url('offscreencanvas_mask.svg#fade_mask_both')";
  21   }
  22
  23   return canvas;
  24 }
  25
  26 async function getRefSnapshot(initWithMask) {
  27   var refCanvas = createCanvas(!initWithMask);
  28   var ctx = refCanvas.getContext("2d");
  29   ctx.rect(0, 0, 64, 64);
  30   ctx.fillStyle = "#00FF00";
  31   ctx.fill();
  32   var result = await snapshotWindow(window);
  33   document.body.removeChild(refCanvas);
  34   return result;
  35 }
  36
  37 function runTest(initWithMask) {
  38   var htmlCanvas = createCanvas(initWithMask);
  39   var worker = new Worker("offscreencanvas.js");
  40
  41   worker.onmessage = async function(evt) {
  42     var msg = evt.data || {};
  43     if (msg.type == "draw") {
  44       if (msg.count === 10) {
  45         // Change the fallback state dynamically when drawing count reaches 10.
  46         if (initWithMask) {
  47           htmlCanvas.style.mask = "";
  48         } else {
  49           htmlCanvas.style.mask = "url('offscreencanvas_mask.svg#fade_mask_both')";
  50         }
  51       } else if (msg.count === 20) {
  52         worker.terminate();
  53         var snapshotFallback = await snapshotWindow(window);
  54         document.body.removeChild(htmlCanvas);
  55
  56         var results = compareSnapshots(snapshotFallback, await getRefSnapshot(initWithMask), true);
  57         ok(results[0], "after dynamic fallback, screenshots should be the same");
  58
  59         if (initWithMask) {
  60           SimpleTest.finish();
  61         } else {
  62           runTest(true);
  63         }
  64       }
  65     }
  66   }
  67
  68   var offscreenCanvas = htmlCanvas.transferControlToOffscreen();
  69
  70   worker.postMessage({test: 'webgl_fallback', canvas: offscreenCanvas}, [offscreenCanvas]);
  71 }
  72
  73 SpecialPowers.pushPrefEnv({'set': [
  74   ['webgl.force-enabled', true],
  75 ]}, runTest.bind(false));
  76
  77 </script>
  78 </body>
  79 </html>