public override void drawOnImage(ref Image image, BoundingBox boundingBox)
{
BitmapDecal decal;
if (!BitmapDecalCache.Instance.decals.TryGetValue(_url, out decal)) return;
Image decalImage = new Image(decal.image);
decalImage.scaleAlpha(_alpha);
decalImage.rotateImage(_rotation);
if (_mirror) decalImage.flipHorizontally();
image.blendImage(decalImage, _blendMethod, _position, _alphaOption, _textureAlpha, boundingBox);
}