testing/web-platform/tests/html/canvas/offscreen/pixel-manipulation/2d.imageData.put.dirty.zero.html

   1 <!DOCTYPE html>
   2 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
   3 <title>OffscreenCanvas test: 2d.imageData.put.dirty.zero</title>
   4 <script src="/resources/testharness.js"></script>
   5 <script src="/resources/testharnessreport.js"></script>
   6 <script src="/html/canvas/resources/canvas-tests.js"></script>
   7
   8 <h1>2d.imageData.put.dirty.zero</h1>
   9 <p class="desc">putImageData() with zero-sized dirty rectangle puts nothing</p>
  10
  11
  12 <script>
  13 var t = async_test("putImageData() with zero-sized dirty rectangle puts nothing");
  14 var t_pass = t.done.bind(t);
  15 var t_fail = t.step_func(function(reason) {
  16     throw reason;
  17 });
  18 t.step(function() {
  19
  20 var canvas = new OffscreenCanvas(100, 50);
  21 var ctx = canvas.getContext('2d');
  22
  23 ctx.fillStyle = '#f00';
  24 ctx.fillRect(0, 0, 100, 50)
  25 var imgdata = ctx.getImageData(0, 0, 100, 50);
  26 ctx.fillStyle = '#0f0';
  27 ctx.fillRect(0, 0, 100, 50)
  28 ctx.putImageData(imgdata, 0, 0, 0, 0, 0, 0);
  29 _assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);
  30 t.done();
  31
  32 });
  33 </script>