mozilla-release/testing/web-platform/tests/offscreen-canvas/compositing/2d.composite.uncovered.fill.destination-in.html

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.composite.uncovered.fill.destination-in</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/canvas-tests.js"></script>

<h1>2d.composite.uncovered.fill.destination-in</h1>
<p class="desc">fill() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged.</p>


<script>
var t = async_test("fill() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged.");
t.step(function() {

var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');


ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
ctx.fillRect(0, 0, 100, 50);
ctx.globalCompositeOperation = 'destination-in';
ctx.fillStyle = 'rgba(0, 0, 255, 0.75)';
ctx.translate(0, 25);
ctx.fillRect(0, 50, 100, 50);
_assertPixelApprox(offscreenCanvas, 50,25, 0,0,0,0, "50,25", "0,0,0,0", 5);

t.done();

});
</script>