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<!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>
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