2d.composite.uncovered.pattern.copy.worker.js

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/compositing/2d.composite.uncovered.pattern.copy.worker.html - WPT Dashboard Interop Dashboard

// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.

// OffscreenCanvas test in a worker:2d.composite.uncovered.pattern.copy

// Description:Pattern fill() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged.

// Note:

importScripts("/resources/testharness.js");

importScripts("/html/canvas/resources/canvas-tests.js");

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.");

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 = 'rgba(0, 255, 255, 0.5)';

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

  ctx.globalCompositeOperation = 'copy';

  var promise = new Promise(function(resolve, reject) {

      var xhr = new XMLHttpRequest();

      xhr.open("GET", '/images/yellow.png');

      xhr.responseType = 'blob';

      xhr.send();

      xhr.onload = function() {

          resolve(xhr.response);

};

});

  promise.then(function(response) {

      return createImageBitmap(response).then(bitmap => {

          ctx.fillStyle = ctx.createPattern(bitmap, 'no-repeat');

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

          _assertPixelApprox(canvas, 50,25, 0,0,0,0, 5);

});

  }).then(t_pass, t_fail);

});

done();