android Paint.setShadowLayer() vs Canvas.drawbitmap() problems

Question

Hi, I use the following code to draw a bitmap during onDraw of a custom View

Paint p = new Paint(Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);
p.setShadowLayer(3,3,3,0xff000000);
Bitmap bmp = BitmapFactory.decodeResource(some drawable jpg);
canvas.drawBitmap(bmp,null,new Rect(blah blah),p);

and the shadow looks funny. What do I mean funny? I mean that I get a different shadow then if I was calling canvas.drawRect(). It looks sorta like the android shadow code is treating the bitmap as an alpha channel or something.

have tried adding p.setColor(0xff000000); and p.setStyle(Paint.Style.FILL); but not difference.

I guess I could drawRect with shadow on, then drawBitmap with shadow off, but that seems silly as it would be rendering pixels twice.