html/canvas/offscreen/pixel-manipulation/2d.imageData.create2.large.worker.js

// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
// OffscreenCanvas test in a worker:2d.imageData.create2.large
// Description:createImageData(sw, sh) works for sizes much larger than the canvas
// Note:

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

var t = async_test("createImageData(sw, sh) works for sizes much larger than the canvas");
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(1000, 2000);
  _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 += 7813) // check ~1024 points (assuming normal scaling)
      if (imgdata.data[i] !== 0)
          isTransparentBlack = false;
  _assert(isTransparentBlack, "isTransparentBlack");
  t.done();
});
done();