2d.composite.uncovered.image.copy.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/compositing/2d.composite.uncovered.image.copy.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.image.copy</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.image.copy</h1>

<p class="desc">drawImage() 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("drawImage() draws pixels not covered by the source object 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 = 'copy';

  var promise = new Promise(function(resolve, reject) {

      var xhr = new XMLHttpRequest();

      xhr.open("GET", '/images/yellow.png');

      xhr.responseType = 'blob';

      xhr.send();

      xhr.onload = function() {

          resolve(xhr.response);

};

});

  promise.then(function(response) {

      return createImageBitmap(response).then(bitmap => {

          ctx.drawImage(bitmap, 40, 40, 10, 10, 40, 50, 10, 10);

          _assertPixelApprox(canvas, 15,15, 0,0,0,0, 5);

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

});

  }).then(t_pass, t_fail);

});

</script>