[jimtabor] 37385: - Fix AlphaBlend checks that pass wine bitmap gdi32 crosstests. Tested in 16 and 24 bit mode Qemu and 32 bit mode hardware, with our AlphaBlend rendering demo program.

Author: jimtabor
Date: Sat Nov 15 20:19:43 2008
New Revision: 37385

URL: http://svn.reactos.org/svn/reactos?rev=37385&view=rev
Log:
- Fix AlphaBlend checks that pass wine bitmap gdi32 crosstests. Tested in 16 and 24 bit
mode Qemu and 32 bit mode hardware, with our AlphaBlend rendering demo program.

Modified:
    trunk/reactos/subsystems/win32/win32k/objects/bitblt.c

Modified: trunk/reactos/subsystems/win32/win32k/objects/bitblt.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/win32/win32k/ob…
==============================================================================
--- trunk/reactos/subsystems/win32/win32k/objects/bitblt.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/win32/win32k/objects/bitblt.c [iso-8859-1] Sat Nov 15
20:19:43 2008
@@ -96,11 +96,24 @@
 	DestRect.top    = YOriginDest;
 	DestRect.right  = XOriginDest + WidthDest;
 	DestRect.bottom = YOriginDest + HeightDest;
+	IntLPtoDP(DCDest, (LPPOINT)&DestRect, 2);
 
 	SourceRect.left   = XOriginSrc;
 	SourceRect.top    = YOriginSrc;
 	SourceRect.right  = XOriginSrc + WidthSrc;
 	SourceRect.bottom = YOriginSrc + HeightSrc;
+	IntLPtoDP(DCSrc, (LPPOINT)&SourceRect, 2);
+
+        if (!DestRect.right ||
+            !DestRect.bottom ||
+            !SourceRect.right ||
+            !SourceRect.bottom)
+            {
+               if (hDCSrc != hDCDest)
+                   DC_UnlockDc(DCSrc);
+               DC_UnlockDc(DCDest);
+               return TRUE;
+            }
 
 	/* Determine surfaces to be used in the bitblt */
 	BitmapDest = BITMAPOBJ_LockBitmap(DCDest->w.hBitmap);