ImageCapture-grabFrame.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /mediacapture-image/ImageCapture-grabFrame.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<body>

<canvas id='canvas0' width=10 height=10></canvas>

<canvas id='canvas1' width=10 height=10></canvas>

</body>

<script>

// This test verifies that ImageCapture can grabFrame()s.

var test = async_test(function() {

  var canvas0 = document.getElementById('canvas0');

  var context0 = canvas0.getContext("2d");

  context0.fillStyle = "red";

  context0.fillRect(0, 0, 10, 10);

  var stream = canvas0.captureStream();

  var capturer = new ImageCapture(stream.getVideoTracks()[0]);

  capturer.grabFrame()

    .then(bitmap => {

      assert_equals(canvas0.width, bitmap.width);

      assert_equals(canvas0.height, bitmap.height);

      var context1 = document.getElementById('canvas1').getContext("2d");

      context1.drawImage(bitmap, 0, 0);

      var imageData0 = context0.getImageData(0, 0, 10, 10);

      var imageData1 = context1.getImageData(0, 0, 10, 10);

      assert_equals(imageData0.width, imageData1.width);

      assert_equals(imageData0.height, imageData1.height);

      assert_equals(imageData0.data.length, imageData1.data.length);

      for (var i = 0; i < imageData0.data.length; i++)

        assert_approx_equals(imageData0.data[i], imageData1.data[i], 5);

      this.done();

})

    .catch(error => {

      assert_unreached('Error during grabFrame(): '+ error);

});

}, 'exercises the ImageCapture API creation and grabFrame().');

</script>