Index: dib1bpp.c
===================================================================
--- dib1bpp.c	(Revision 40310)
+++ dib1bpp.c	(Arbeitskopie)
@@ -62,8 +62,11 @@
 static
 void
 DIB_1BPP_BitBltSrcCopy_From1BPP (
-	SURFOBJ* DestSurf, SURFOBJ* SourceSurf,
-	PRECTL DestRect, POINTL *SourcePoint )
+	SURFOBJ* DestSurf,
+	SURFOBJ* SourceSurf,
+	XLATEOBJ* pxlo,
+	PRECTL DestRect,
+	POINTL *SourcePoint )
 {
 	// the 'window' in this sense is the x-position that corresponds
 	// to the left-edge of the 8-pixel byte we are currently working with.
@@ -90,7 +93,7 @@
 
     int dx;
 	int shift;
-	BYTE srcmask, dstmask;
+	BYTE srcmask, dstmask, xormask;
 
 	// 'd' and 's' are the dest & src buffer pointers that I use on my x-sweep
 	// 'pd' and 'ps' are the dest & src buffer pointers used on the inner y-sweep
@@ -99,6 +102,8 @@
 
 	shift = (dl-sl)&7;
 
+    xormask = 0xFF * XLATEOBJ_iXlate(pxlo, 0);
+
 	if ( DestRect->top <= SourcePoint->y )
 	{
 		// moving up ( scan top -> bottom )
@@ -164,7 +169,7 @@
 		{
 			for ( ;; )
 			{
-				*pd = (BYTE)((*pd & dstmask) | (*ps & srcmask));
+			    *pd = (BYTE)((*pd & dstmask) | ((ps[0]^xormask) & srcmask));
 
 				// this *must* be here, because we could be going up *or* down...
 				if ( dy == dy2 )
@@ -179,7 +184,7 @@
 			for ( ;; )
 			{
 				*pd = (BYTE)((*pd & dstmask)
-					| ( ( ps[1] >> shift ) & srcmask ));
+					| ( ( (ps[1]^xormask) >> shift ) & srcmask ));
 
 				// this *must* be here, because we could be going up *or* down...
 				if ( dy == dy2 )
@@ -194,7 +199,7 @@
 			for ( ;; )
 			{
 				*pd = (*pd & dstmask)
-					| ( ( ps[0] << ( 8 - shift ) ) & srcmask );
+					| ( ( (ps[0]^xormask) << ( 8 - shift ) ) & srcmask );
 
 				// this *must* be here, because we could be going up *or* down...
 				if ( dy == dy2 )
@@ -209,7 +214,7 @@
 			for ( ;; )
 			{
 				*pd = (*pd & dstmask)
-					| ( ( ( (ps[1])|(ps[0]<<8) ) >> shift ) & srcmask );
+					| ( ( ( ((ps[1]^xormask))|((ps[0]^xormask)<<8) ) >> shift ) & srcmask );
 
 				// this *must* be here, because we could be going up *or* down...
 				if ( dy == dy2 )