testing/web-platform/tests/html/canvas/offscreen/compositing/2d.composite.uncovered.pattern.copy.html

   1 <!DOCTYPE html>
   2 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
   3 <title>OffscreenCanvas test: 2d.composite.uncovered.pattern.copy</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.composite.uncovered.pattern.copy</h1>
   9 <p class="desc">Pattern fill() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged.</p>
  10
  11
  12 <script>
  13 var t = async_test("Pattern fill() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged.");
  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
  24 ctx.fillStyle = 'rgba(0, 255, 255, 0.5)';
  25 ctx.fillRect(0, 0, 100, 50);
  26 ctx.globalCompositeOperation = 'copy';
  27 var promise = new Promise(function(resolve, reject) {
  28     var xhr = new XMLHttpRequest();
  29     xhr.open("GET", '/images/yellow.png');
  30     xhr.responseType = 'blob';
  31     xhr.send();
  32     xhr.onload = function() {
  33         resolve(xhr.response);
  34     };
  35 });
  36 promise.then(function(response) {
  37     createImageBitmap(response).then(bitmap => {
  38         ctx.fillStyle = ctx.createPattern(bitmap, 'no-repeat');
  39         ctx.fillRect(0, 50, 100, 50);
  40         _assertPixelApprox(canvas, 50,25, 0,0,0,0, 5);
  41     }, t_fail);
  42 }).then(t_pass, t_fail);
  43
  44 });
  45 </script>