2d.imageData.object.readonly.html

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

<p class="desc">ImageData objects properties are read-only</p>

<script>

var t = async_test("ImageData objects properties are read-only");

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

  var w = imgdata.width;

  var h = imgdata.height;

  var d = imgdata.data;

  imgdata.width = 123;

  imgdata.height = 123;

  imgdata.data = [100,100,100,100];

  _assertSame(imgdata.width, w, "imgdata.width", "w");

  _assertSame(imgdata.height, h, "imgdata.height", "h");

  _assertSame(imgdata.data, d, "imgdata.data", "d");

  _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0");

  _assertSame(imgdata.data[1], 0, "imgdata.data[\""+(1)+"\"]", "0");

  _assertSame(imgdata.data[2], 0, "imgdata.data[\""+(2)+"\"]", "0");

  _assertSame(imgdata.data[3], 0, "imgdata.data[\""+(3)+"\"]", "0");

  t.done();

});

</script>