test_offscreencanvas_toblob.html

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<!DOCTYPE HTML>

<html>

<head>

<title>WebGL in OffscreenCanvas</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<script src="offscreencanvas.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

</head>

<body>

<canvas id="c" width="64" height="64"></canvas>

<canvas id="c-mt" width="64" height="64"></canvas>

<canvas id="c-ref" width="64" height="64"></canvas>

<script>

SimpleTest.waitForExplicitFinish();

function testBlob(blob, callback) {

  // testing toBlob

  // Fill c-ref with green color.

  var c = document.getElementById("c-ref");

  var ctx = c.getContext("2d");

  ctx.rect(0, 0, 64, 64);

  ctx.fillStyle = "#00FF00";

  ctx.fill();

  var reader = new FileReader();

  reader.onload = function(e) {

    ok(c.toDataURL() == e.target.result, "toBlob should return a 64x64 green square");

    callback();

};

  reader.readAsDataURL(blob);

function runTestOnMainThread() {

  var htmlCanvas = document.getElementById("c-mt");

  ok(htmlCanvas, "Should have HTML canvas element");

  window.onmessage = function(evt) {

    var msg = evt.data || {};

    if (msg.type == "test") {

      ok(msg.result, msg.name);

    if (msg.type == "blob") {

      testBlob(msg.blob, SimpleTest.finish);

  ok(htmlCanvas.transferControlToOffscreen, "HTMLCanvasElement has transferControlToOffscreen function");

  var offscreenCanvas = htmlCanvas.transferControlToOffscreen();

  ok(offscreenCanvas, "Expected transferControlToOffscreen to succeed");

  entryFunction('webgl_toblob', '', offscreenCanvas);

function runTest() {

  var htmlCanvas = document.getElementById("c");

  var worker = new Worker("offscreencanvas.js");

  ok(htmlCanvas, "Should have HTML canvas element");

  ok(worker, "Web worker successfully created");

  worker.onmessage = function(evt) {

    var msg = evt.data || {};

    if (msg.type == "test") {

      ok(msg.result, msg.name);

    if (msg.type == "blob") {

      testBlob(msg.blob, function() {

        worker.terminate();

        runTestOnMainThread();

});

  ok(htmlCanvas.transferControlToOffscreen, "HTMLCanvasElement has transferControlToOffscreen function");

  var offscreenCanvas = htmlCanvas.transferControlToOffscreen();

  ok(offscreenCanvas, "Expected transferControlToOffscreen to succeed");

  worker.postMessage({test: 'webgl_toblob', canvas: offscreenCanvas}, [offscreenCanvas]);

SpecialPowers.pushPrefEnv({'set': [

  ['webgl.force-enabled', true],

]}, runTest);

</script>

</body>

</html>