Index: fbblt.c
===================================================================
RCS file: /cvs/XF4/xc/programs/Xserver/fb/fbblt.c,v
retrieving revision 1.2
diff -u -p -r1.2 fbblt.c
--- fbblt.c 3 Nov 2004 00:07:51 -0000 1.2
+++ fbblt.c 29 Aug 2005 07:27:41 -0000
@@ -267,8 +267,11 @@ fbBlt (FbBits   *srcLine,
 		if (startmask)
 		{
 		    bits = FbScrLeft(bits1, leftShift); 
-		    bits1 = *src++;
-		    bits |= FbScrRight(bits1, rightShift);
+		    if (FbScrLeft(startmask, rightShift))
+		    {
+			bits1 = *src++;
+			bits |= FbScrRight(bits1, rightShift);
+		    }
 		    FbDoLeftMaskByteMergeRop (dst, bits, startbyte, startmask);
 		    dst++;
 		}