[Flashcoders] Flip BitmapData with Alpha

[Elia Morling]

How do I preserve alpha when flipping a bitmapdata? This is what I use now.
public static function flipHorizontal(source:BitmapData):BitmapData{
 var m:Matrix = new Matrix();
 m.a=-1;
 m.tx=source.width;
 var bmd:BitmapData = new BitmapData(source.width, source.height, 
source.transparent);
 bmd.draw(source, m);
 return bmd;
}

Thanks
Elia 
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