2d.imageData.put.unchanged.html

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

<p class="desc">putImageData(getImageData(...), ...) has no effect</p>

<script>

var t = async_test("putImageData(getImageData(...), ...) has no effect");

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');

  var i = 0;

  for (var y = 0; y < 16; ++y) {

      for (var x = 0; x < 16; ++x, ++i) {

          ctx.fillStyle = 'rgba(' + i + ',' + (Math.floor(i*1.5) % 256) + ',' + (Math.floor(i*23.3) % 256) + ',' + (i/256) + ')';

          ctx.fillRect(x, y, 1, 1);

  var imgdata1 = ctx.getImageData(0.1, 0.2, 15.8, 15.9);

  var olddata = [];

  for (var i = 0; i < imgdata1.data.length; ++i)

      olddata[i] = imgdata1.data[i];

  ctx.putImageData(imgdata1, 0.1, 0.2);

  var imgdata2 = ctx.getImageData(0.1, 0.2, 15.8, 15.9);

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

      _assertSame(olddata[i], imgdata2.data[i], "olddata[\""+(i)+"\"]", "imgdata2.data[\""+(i)+"\"]");

  t.done();

});

</script>