2d.composite.uncovered.nocontext.source-out.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/compositing/2d.composite.uncovered.nocontext.source-out.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->

<title>OffscreenCanvas test: 2d.composite.uncovered.nocontext.source-out</title>

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

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

<script src="/html/canvas/resources/canvas-tests.js"></script>

<h1>2d.composite.uncovered.nocontext.source-out</h1>

<p class="desc">drawImage() of a canvas with no context draws pixels as (0,0,0,0), and does not leave the pixels unchanged.</p>

<script>

var t = async_test("drawImage() of a canvas with no context draws pixels as (0,0,0,0), and does not leave the pixels unchanged.");

var t_pass = t.done.bind(t);

var t_fail = t.step_func(function(reason) {

    throw reason;

});

t.step(function() {

  var canvas = new OffscreenCanvas(100, 50);

  var ctx = canvas.getContext('2d');

  ctx.fillStyle = 'rgba(0, 255, 255, 0.5)';

  ctx.fillRect(0, 0, 100, 50);

  ctx.globalCompositeOperation = 'source-out';

  var offscreenCanvas2 = new OffscreenCanvas(100, 50);

  ctx.drawImage(offscreenCanvas2, 0, 0);

  _assertPixelApprox(canvas, 50,25, 0,0,0,0, 5);

  t.done();

});

</script>