Returns a new BitmapData with a copy of this BitmapData's texture.
Source
BitmapData clone([num pixelRatio]) {
if (pixelRatio == null) pixelRatio = renderTextureQuad.pixelRatio;
var bitmapData = new BitmapData(width, height, Color.Transparent, pixelRatio);
bitmapData.drawPixels(this, this.rectangle, new Point<num>(0, 0));
return bitmapData;
}