testing/web-platform/tests/html/canvas/offscreen/pixel-manipulation/2d.imageData.get.nonpremul.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.get.nonpremul</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.get.nonpremul</h1>
   9 <p class="desc">getImageData() returns non-premultiplied colors</p>
  10
  11
  12 <script>
  13 var t = async_test("getImageData() returns non-premultiplied colors");
  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 = 'rgba(255, 255, 255, 0.5)';
  24 ctx.fillRect(0, 0, 100, 50);
  25 var imgdata = ctx.getImageData(10, 10, 10, 10);
  26 _assert(imgdata.data[0] > 200, "imgdata.data[\""+(0)+"\"] > 200");
  27 _assert(imgdata.data[1] > 200, "imgdata.data[\""+(1)+"\"] > 200");
  28 _assert(imgdata.data[2] > 200, "imgdata.data[\""+(2)+"\"] > 200");
  29 _assert(imgdata.data[3] > 100, "imgdata.data[\""+(3)+"\"] > 100");
  30 _assert(imgdata.data[3] < 200, "imgdata.data[\""+(3)+"\"] < 200");
  31 t.done();
  32
  33 });
  34 </script>