fixed wrong rendering of clipped characters

reactos/subsys/win32k/eng

diff -u -r1.42 -r1.43
--- bitblt.c	24 Feb 2004 13:27:02 -0000	1.42
+++ bitblt.c	22 Mar 2004 14:58:56 -0000	1.43
@@ -16,7 +16,7 @@

  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

-/* $Id: bitblt.c,v 1.42 2004/02/24 13:27:02 weiden Exp $

+/* $Id: bitblt.c,v 1.43 2004/03/22 14:58:56 weiden Exp $

  *
  * COPYRIGHT:        See COPYING in the top level directory
  * PROJECT:          ReactOS kernel

@@ -892,7 +892,7 @@

       g = (int)GetGValue(BrushColor);
       b = (int)GetBValue(BrushColor);
       

-      tMask = Mask->pvBits + MaskPoint->y * Mask->lDelta + MaskPoint->x;

+      tMask = Mask->pvBits + (SourcePoint->y * Mask->lDelta) + SourcePoint->x;

       for (j = 0; j < dy; j++)
 	{
 	  lMask = tMask;