2d.imageData.put.modified.worker.js

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/pixel-manipulation/2d.imageData.put.modified.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.imageData.put.modified

// Description:putImageData() puts modified image data correctly

// Note:

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

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

var t = async_test("putImageData() puts modified image data correctly");

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 = '#0f0';

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

  ctx.fillStyle = '#f00';

  ctx.fillRect(45, 20, 10, 10)

  var imgdata = ctx.getImageData(45, 20, 10, 10);

  for (var i = 0, len = imgdata.width*imgdata.height*4; i < len; i += 4)

      imgdata.data[i] = 0;

      imgdata.data[i+1] = 255;

  ctx.putImageData(imgdata, 45, 20);

  _assertPixelApprox(canvas, 50,25, 0,255,0,255, 2);

  t.done();

});

done();