2d.imageData.get.order.alpha.html

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/pixel-manipulation/2d.imageData.get.order.alpha.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.get.order.alpha</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.get.order.alpha</h1>

<p class="desc">getImageData() returns A in the fourth component</p>

<script>

var t = async_test("getImageData() returns A in the fourth component");

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, 0, 0, 0.5)';

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

  var imgdata = ctx.getImageData(0, 0, 10, 10);

  _assert(imgdata.data[3] < 200, "imgdata.data[\""+(3)+"\"] < 200");

  _assert(imgdata.data[3] > 100, "imgdata.data[\""+(3)+"\"] > 100");

  t.done();

});

</script>