bitmapdata.draw and stage3D

Good news, thank you!

Can anyone tell me what could be a Stage3D equivalent of this:

var img:BitmapData = .......

var rgn:Rectangle = ........

var scl:Number = ....

var matrix:Matrix = new flash.geom.Matrix();

rgn.x *= scl;

rgn.y *= scl;

rgn.width *= scl;

rgn.height *= scl;

matrix.scale(scl,scl);

matrix.tx = -rgn.left;

matrix.ty = -rgn.top;

var mapBD:BitmapData = new BitmapData(rgn.width,rgn.height,false,0x000000);

mapBD.draw(img,matrix,null,null,new Rectangle(0,0,rgn.width,rgn.height),true);

var mapLayer:Bitmap = new Bitmap(mapBD);