testing/web-platform/tests/html/canvas/offscreen/pixel-manipulation/2d.imageData.create2.initial.worker.js


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// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
// OffscreenCanvas test in a worker:2d.imageData.create2.initial
// Description:createImageData(sw, sh) returns transparent black data of the right size
// Note:

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

var t = async_test("createImageData(sw, sh) returns transparent black data of the right size");
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');

  var imgdata = ctx.createImageData(10, 20);
  _assertSame(imgdata.data.length, imgdata.width*imgdata.height*4, "imgdata.data.length", "imgdata.width*imgdata.height*4");
  _assert(imgdata.width < imgdata.height, "imgdata.width < imgdata.height");
  _assert(imgdata.width > 0, "imgdata.width > 0");
  var isTransparentBlack = true;
  for (var i = 0; i < imgdata.data.length; ++i)
      if (imgdata.data[i] !== 0)
          isTransparentBlack = false;
  _assert(isTransparentBlack, "isTransparentBlack");
  t.done();
});
done();