2d.imageData.put.dirty.negative.html

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

<p class="desc">putImageData() handles negative-sized dirty rectangles correctly</p>

<script>

var t = async_test("putImageData() handles negative-sized dirty rectangles correctly");

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 = '#f00';

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

  ctx.fillStyle = '#0f0';

  ctx.fillRect(0, 0, 20, 20)

  var imgdata = ctx.getImageData(0, 0, 100, 50);

  ctx.fillStyle = '#0f0';

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

  ctx.fillStyle = '#f00';

  ctx.fillRect(40, 20, 20, 20)

  ctx.putImageData(imgdata, 40, 20, 20, 20, -20, -20);

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

  _assertPixelApprox(canvas, 35,25, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 65,25, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 50,15, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 50,45, 0,255,0,255, 2);

  t.done();

});

</script>