<!DOCTYPE HTML>

<!-- READ BEFORE UPDATING:
If this test is updated make sure to increment the "revision" value of the
associated test in content/test/gpu/page_sets/pixel_tests.py. This will ensure
that the baseline images are regenerated on the next run.
-->

<html>
<head>
<title>OffscreenCanvas commit flow on worker thread: red square on white background.</title>
<style type="text/css">
.nomargin {
  margin: 0px auto;
}
</style>
<script id="myWorker" type="text/worker">
self.onmessage = function(e) {
  var transferredOffscreenCanvas = e.data;
  var gl = transferredOffscreenCanvas.getContext("webgl");
  gl.clearColor(1.0, 0.0, 0.0, 1.0);
  gl.clear(gl.COLOR_BUFFER_BIT);
  gl.commit();
};
</script>
<script>
var g_swapsBeforeAck = 15;

function makeWorker(script) {
   var blob = new Blob([script]);
   return new Worker(URL.createObjectURL(blob));
}

function main()
{
  draw();
  waitForFinish();
}

function draw()
{
  var canvas = document.getElementById("c");
  var offscreenCanvas = canvas.transferControlToOffscreen();
  var worker = makeWorker(document.getElementById("myWorker").textContent);
  worker.postMessage(offscreenCanvas, [offscreenCanvas]);
}

function waitForFinish()
{
  if (g_swapsBeforeAck == 0) {
    domAutomationController.setAutomationId(1);
    domAutomationController.send("SUCCESS");
  } else {
    g_swapsBeforeAck--;
    document.getElementById('container').style.zIndex = g_swapsBeforeAck + 1;
    window.webkitRequestAnimationFrame(waitForFinish);
  }
}
</script>
</head>
<body onload="main()">
<div style="position:relative; width:200px; height:200px; background-color:white">
</div>
<div id="container" style="position:absolute; top:0px; left:0px">
<canvas id="c" width="200" height="200" class="nomargin"></canvas>
</div>
</body>
</html>