[fireball] 49197: - Forward BitBlt with NULL source DC to PatBlt. Fixes this kind of crashes in different apps (ab)using this feature of WinAPI. See issue #5628 for more details.

Author: fireball
Date: Mon Oct 18 15:30:18 2010
New Revision: 49197

URL: http://svn.reactos.org/svn/reactos?rev=49197&view=rev
Log:
- Forward BitBlt with NULL source DC to PatBlt. Fixes this kind of crashes in different
apps (ab)using this feature of WinAPI.
See issue #5628 for more details.

Modified:
    branches/arwinss/reactos/dll/win32/winent.drv/gdidrv.c

Modified: branches/arwinss/reactos/dll/win32/winent.drv/gdidrv.c
URL:
http://svn.reactos.org/svn/reactos/branches/arwinss/reactos/dll/win32/winen…
==============================================================================
--- branches/arwinss/reactos/dll/win32/winent.drv/gdidrv.c [iso-8859-1] (original)
+++ branches/arwinss/reactos/dll/win32/winent.drv/gdidrv.c [iso-8859-1] Mon Oct 18
15:30:18 2010
@@ -28,6 +28,8 @@
 
 /* FUNCTIONS **************************************************************/
 
+BOOL CDECL RosDrv_PatBlt( NTDRV_PDEVICE *physDev, INT left, INT top, INT width, INT
height, DWORD rop );
+
 BOOL CDECL RosDrv_AlphaBlend(NTDRV_PDEVICE *physDevDst, INT xDst, INT yDst, INT widthDst,
INT heightDst,
                              NTDRV_PDEVICE *physDevSrc, INT xSrc, INT ySrc, INT widthSrc,
INT heightSrc,
                              BLENDFUNCTION blendfn)
@@ -95,7 +97,15 @@
                     INT width, INT height, NTDRV_PDEVICE *physDevSrc,
                     INT xSrc, INT ySrc, DWORD rop )
 {
+    BOOL useSrc;
     POINT pts[2], ptBrush;
+
+    useSrc = (((rop >> 2) & 0x330000) != (rop & 0x330000));
+    if (!physDevSrc && useSrc) return FALSE;
+
+    /* Forward to PatBlt if src dev is missing */
+    if (!physDevSrc)
+        return RosDrv_PatBlt(physDevDst, xDst, yDst, width, height, rop);
 
     /* map source coordinates */
     if (physDevSrc)
@@ -897,7 +907,11 @@
                               NTDRV_PDEVICE *physDevSrc, INT xSrc, INT ySrc,
                               INT widthSrc, INT heightSrc, DWORD rop )
 {
+    BOOL useSrc;
     POINT pts[2], ptBrush;
+
+    useSrc = (((rop >> 2) & 0x330000) != (rop & 0x330000));
+    if (!physDevSrc && useSrc) return FALSE;
 
     /* map source coordinates */
     if (physDevSrc)