function getAbsolutePixelAt(x, y) {
  // normalize coordinates
  const bw = this.bounds.w;
  const bh = this.bounds.h;
  const xx = x - this.bounds.x;
  const yy = y - this.bounds.y;
  // check if point inside boundings
  if (
    (xx < 0 || yy < 0) ||
    (bw <= 0 || bh <= 0) ||
    (xx >= bw || yy >= bh)
  ) return (null);
  // go through each layer reversed
  // and search for the given pixel
  const layers = this.layers;
  for (let ii = 0; ii < layers.length; ++ii) {
    const layer = layers[ii];
    if (!layer.visible) continue;
    const pixel = layer.getPixelAt(x, y);
    if (pixel !== null) return (pixel);
  };
  return (null);
}
Get absolute pixel
@param {Number} x
@param {Number} y
@return {Array}