2d.imageData.put.modified.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/pixel-manipulation/2d.imageData.put.modified.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>Canvas test: 2d.imageData.put.modified</title>

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

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

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

<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">

<body class="show_output">

<h1>2d.imageData.put.modified</h1>

<p class="desc">putImageData() puts modified image data correctly</p>

<p class="output">Actual output:</p>

<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>

<p class="output expectedtext">Expected output:<p><img src="/images/green-100x50.png" class="output expected" id="expected" alt="">

<ul id="d"></ul>

<script>

var t = async_test("putImageData() puts modified image data correctly");

_addTest(function(canvas, ctx) {

  ctx.fillStyle = '#0f0';

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

  ctx.fillStyle = '#f00';

  ctx.fillRect(45, 20, 10, 10)

  var imgdata = ctx.getImageData(45, 20, 10, 10);

  for (var i = 0, len = imgdata.width*imgdata.height*4; i < len; i += 4)

      imgdata.data[i] = 0;

      imgdata.data[i+1] = 255;

  ctx.putImageData(imgdata, 45, 20);

  _assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);

});

</script>