Added ReleaseDC function to the USER driver interface.

dlls/user/user_main.c

@@ -105,6 +105,7 @@ static BOOL load_driver(void)
     GET_USER_FUNC(GetDC);
     GET_USER_FUNC(ForceWindowRaise);
     GET_USER_FUNC(MsgWaitForMultipleObjectsEx);
+    GET_USER_FUNC(ReleaseDC);
     GET_USER_FUNC(ScrollDC);
     GET_USER_FUNC(ScrollWindowEx);
     GET_USER_FUNC(SetFocus);

dlls/x11drv/winpos.c

@@ -531,6 +531,17 @@ BOOL X11DRV_GetDC( HWND hwnd, HDC hdc, HRGN hrgn, DWORD flags )
 }
 
 
+/***********************************************************************
+ *		ReleaseDC (X11DRV.@)
+ */
+void X11DRV_ReleaseDC( HWND hwnd, HDC hdc )
+{
+    POINT org;
+
+    org.x = org.y = 0;
+    X11DRV_SetDrawable( hdc, root_window, IncludeInferiors, &org, &org );
+}
+
 
 /***********************************************************************
  *           SWP_DoWinPosChanging

dlls/x11drv/x11drv.spec

@@ -77,6 +77,7 @@
 @ cdecl GetDC(long long long long) X11DRV_GetDC
 @ cdecl ForceWindowRaise(long) X11DRV_ForceWindowRaise
 @ cdecl MsgWaitForMultipleObjectsEx(long ptr long long long) X11DRV_MsgWaitForMultipleObjectsEx
+@ cdecl ReleaseDC(long long) X11DRV_ReleaseDC
 @ cdecl ScrollDC(long long long ptr ptr long ptr) X11DRV_ScrollDC
 @ cdecl ScrollWindowEx(long long long ptr ptr long ptr long) X11DRV_ScrollWindowEx
 @ cdecl SetFocus(long) X11DRV_SetFocus

include/user.h

@@ -98,6 +98,7 @@ typedef struct tagUSER_DRIVER {
     BOOL   (*pGetDC)(HWND,HDC,HRGN,DWORD);
     void   (*pForceWindowRaise)(HWND);
     DWORD  (*pMsgWaitForMultipleObjectsEx)(DWORD,const HANDLE*,DWORD,DWORD,DWORD);
+    void   (*pReleaseDC)(HWND,HDC);
     BOOL   (*pScrollDC)(HDC,INT,INT,const RECT*,const RECT*,HRGN,LPRECT);
     INT    (*pScrollWindowEx)(HWND,INT,INT,const RECT*,const RECT*,HRGN,LPRECT,UINT);
     void   (*pSetFocus)(HWND);

windows/dce.c

@@ -172,6 +172,8 @@ void DCE_FreeWindowDCE( HWND hwnd )
                 }
 		else if( pDCE->DCXflags & (DCX_INTERSECTRGN | DCX_EXCLUDERGN) )	/* Class DCE*/
 		{
+                    if (USER_Driver.pReleaseDC)
+                        USER_Driver.pReleaseDC( pDCE->hwndCurrent, pDCE->hDC );
                     DCE_DeleteClipRgn( pDCE );
                     pDCE->hwndCurrent = 0;
 		}
@@ -191,6 +193,8 @@ void DCE_FreeWindowDCE( HWND hwnd )
 		    DCE_ReleaseDC( pDCE );
 		}
 
+                if (pDCE->hwndCurrent && USER_Driver.pReleaseDC)
+                    USER_Driver.pReleaseDC( pDCE->hwndCurrent, pDCE->hDC );
 		pDCE->DCXflags &= DCX_CACHE;
 		pDCE->DCXflags |= DCX_DCEEMPTY;
 		pDCE->hwndCurrent = 0;
@@ -247,7 +251,8 @@ static INT DCE_ReleaseDC( DCE* dce )
 	    /* don't keep around invalidated entries
 	     * because SetDCState() disables hVisRgn updates
 	     * by removing dirty bit. */
-
+            if (dce->hwndCurrent && USER_Driver.pReleaseDC)
+                USER_Driver.pReleaseDC( dce->hwndCurrent, dce->hDC );
 	    dce->hwndCurrent = 0;
 	    dce->DCXflags &= DCX_CACHE;
 	    dce->DCXflags |= DCX_DCEEMPTY;
@@ -306,6 +311,8 @@ BOOL DCE_InvalidateDCE(HWND hwnd, const RECT* pRectUpdate)
                     /* Don't bother with visible regions of unused DCEs */
 
                     TRACE("\tpurged %p dce [%04x]\n", dce, dce->hwndCurrent);
+                    if (dce->hwndCurrent && USER_Driver.pReleaseDC)
+                        USER_Driver.pReleaseDC( dce->hwndCurrent, dce->hDC );
                     dce->hwndCurrent = 0;
                     dce->DCXflags &= DCX_CACHE;
                     dce->DCXflags |= DCX_DCEEMPTY;

windows/win.c

@@ -694,8 +694,8 @@ LRESULT WIN_DestroyWindow( HWND hwnd )
 	DestroyMenu( wndPtr->hSysMenu );
 	wndPtr->hSysMenu = 0;
     }
-    USER_Driver.pDestroyWindow( hwnd );
     DCE_FreeWindowDCE( hwnd );    /* Always do this to catch orphaned DCs */
+    USER_Driver.pDestroyWindow( hwnd );
     WINPROC_FreeProc( wndPtr->winproc, WIN_PROC_WINDOW );
     CLASS_RemoveWindow( wndPtr->class );
     wndPtr->class = NULL;