Attempt to fix bug 3259. Use IntGdiCleanDC for error checking.

svn path=/trunk/; revision=33863

reactos/subsystems/win32/win32k/include/dc.h

@@ -261,6 +261,8 @@ typedef struct _GDIDEVICE
 #define  DC_UnlockDc(pDC)  \
   GDIOBJ_UnlockObjByPtr ((POBJ)pDC)
 
+extern PDC defaultDCstate;
+
 NTSTATUS FASTCALL InitDcImpl(VOID);
 PGDIDEVICE FASTCALL IntEnumHDev(VOID);
 HDC  FASTCALL DC_AllocDC(PUNICODE_STRING  Driver);

reactos/subsystems/win32/win32k/ntuser/windc.c

@@ -19,7 +19,6 @@
 /* NOTE - I think we should store this per window station (including gdi objects) */
 
 static PDCE FirstDce = NULL;
-static PDC defaultDCstate = NULL;
 //static INT DCECount = 0; // Count of DCE in system.
 
 #define DCX_CACHECOMPAREMASK (DCX_CLIPSIBLINGS | DCX_CLIPCHILDREN | \
@@ -228,13 +227,11 @@ DceReleaseDC(DCE* dce, BOOL EndPaint)
    {
      if (!(dce->DCXFlags & DCX_NORESETATTRS))
      {
-       PDC dc;
        /* make the DC clean so that SetDCState doesn't try to update the vis rgn */
        IntGdiSetHookFlags(dce->hDC, DCHF_VALIDATEVISRGN);
 
-       dc = DC_LockDc ( dce->hDC );
        // Clean the DC
-       IntGdiCopyFromSaveState(dc, defaultDCstate, dce->hDC ); // Was SetDCState.
+       if (!IntGdiCleanDC(dce->hDC)) return 0;
 
        dce->DCXFlags &= ~DCX_DCEBUSY;
        if (dce->DCXFlags & DCX_DCEDIRTY)

reactos/subsystems/win32/win32k/objects/dc.c

@@ -33,7 +33,7 @@ static GDIDEVICE PrimarySurface;
 PGDIDEVICE pPrimarySurface = &PrimarySurface;
 static KEVENT VideoDriverNeedsPreparation;
 static KEVENT VideoDriverPrepared;
-static PDC defaultDCstate = NULL;
+PDC defaultDCstate = NULL;
 
 
 NTSTATUS FASTCALL
@@ -952,10 +952,11 @@ BOOL FASTCALL
 IntGdiCleanDC(HDC hDC)
 {
   PDC dc;
+  if (!hDC) return FALSE;
   dc = DC_LockDc ( hDC );
+  if (!dc) return FALSE;
   // Clean the DC
   if (defaultDCstate) IntGdiCopyFromSaveState(dc, defaultDCstate, hDC );
-  DC_UnlockDc(dc);
   return TRUE;
 }