When I update the Direct Screen Access sample to display
a 'masked' bouncing ball with
iGc->BitBltMasked(iPosition, iBallImage, bmpPieceRect, iBallImageMask, EFalse);  
..instead of the default  
iGc->BitBlt(iPosition, iBallImage);  

..it doesn't render anything.

The sample goes as far as loading the masked bitmap and presents it as a member of CDDBouncingBallEngine, but never actually used the mask.
(I wonder if this was deliberate?, could somebody verify this?.)

Is there an issue with bitmap masks in DSA mode?  
Is there another/new way of achieving it?

cheers,

paris.