2d.imageData.create1.initial.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/pixel-manipulation/2d.imageData.create1.initial.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

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

<meta charset="UTF-8">

<title>OffscreenCanvas test: 2d.imageData.create1.initial</title>

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

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

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

<h1>2d.imageData.create1.initial</h1>

<p class="desc">createImageData(imgdata) returns transparent black data of the right size</p>

<script>

var t = async_test("createImageData(imgdata) returns transparent black data of the right size");

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 = '#0f0';

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

  var imgdata1 = ctx.getImageData(0, 0, 10, 20);

  var imgdata2 = ctx.createImageData(imgdata1);

  _assertSame(imgdata2.data.length, imgdata1.data.length, "imgdata2.data.length", "imgdata1.data.length");

  _assertSame(imgdata2.width, imgdata1.width, "imgdata2.width", "imgdata1.width");

  _assertSame(imgdata2.height, imgdata1.height, "imgdata2.height", "imgdata1.height");

  var isTransparentBlack = true;

  for (var i = 0; i < imgdata2.data.length; ++i)

      if (imgdata2.data[i] !== 0)

          isTransparentBlack = false;

  _assert(isTransparentBlack, "isTransparentBlack");

  t.done();

});

</script>