dom/canvas/test/test_offscreencanvas_sharedworker.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4 <title>WebGL in OffscreenCanvas</title>
   5 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   6 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   7 </head>
   8 <body>
   9 <canvas id="c" width="64" height="64"></canvas>
  10 <script>
  11
  12 SimpleTest.waitForExplicitFinish();
  13
  14 function runTest() {
  15
  16   var htmlCanvas = document.getElementById("c");
  17   var worker = new SharedWorker("offscreencanvas.js");
  18
  19   ok(htmlCanvas, "Should have HTML canvas element");
  20   ok(worker, "Web worker successfully created");
  21
  22   ok(htmlCanvas.transferControlToOffscreen, "HTMLCanvasElement has transferControlToOffscreen function");
  23
  24   var offscreenCanvas = htmlCanvas.transferControlToOffscreen();
  25   ok(offscreenCanvas, "Expected transferControlToOffscreen to succeed");
  26
  27   worker.port.start();
  28
  29   // We don't support transferring OffscreenCanvas via shared worker.
  30   SimpleTest.doesThrow(
  31     function() {
  32       worker.port.postMessage({test: 'webgl', canvas: offscreenCanvas}, [offscreenCanvas]);
  33     },
  34     "OffscreenCanvas cannot transfer to shared worker"
  35   );
  36
  37   SimpleTest.finish();
  38 }
  39
  40 SpecialPowers.pushPrefEnv({'set': [
  41   ['webgl.force-enabled', true],
  42 ]}, runTest);
  43
  44 </script>
  45 </body>
  46 </html>