Index: subsystems/win32/win32k/dib/dibXXbpp.c
===================================================================
--- subsystems/win32/win32k/dib/dibXXbpp.c	(revision 40359)
+++ subsystems/win32/win32k/dib/dibXXbpp.c	(working copy)
@@ -50,7 +50,7 @@
     PFN_DIB_GetPixel fnPattern_GetPixel = NULL;
     PFN_DIB_GetPixel fnMask_GetPixel = NULL;
 
-    ULONG PatternX = 0, PatternY = 0;
+    LONG PatternX = 0, PatternY = 0;
 
     BOOL UsesSource = ROP4_USES_SOURCE(ROP);
     BOOL UsesPattern = ROP4_USES_PATTERN(ROP);
Index: subsystems/win32/win32k/eng/bitblt.c
===================================================================
--- subsystems/win32/win32k/eng/bitblt.c	(revision 40359)
+++ subsystems/win32/win32k/eng/bitblt.c	(working copy)
@@ -938,8 +938,8 @@
     }
     if (OutputRect.bottom < OutputRect.top)
     {
-        OutputRect.left = prclDest->right;
-        OutputRect.right = prclDest->left;
+        OutputRect.top = prclDest->bottom;
+        OutputRect.bottom = prclDest->top;
     }
     
     InputRect = *prclSrc;
@@ -1198,8 +1198,8 @@
         }
         InputRect = *SourceRect;
  
-        if (InputClippedRect.right < InputClippedRect.left ||
-                InputClippedRect.bottom < InputClippedRect.top)
+        if (InputRect.right < InputRect.left ||
+                InputRect.bottom < InputRect.top)
         {
             /* Everything clipped away, nothing to do */
             return TRUE;