user32: Use win32u to get and set MDI client info.

dlls/user32/mdi.c

@@ -194,22 +194,7 @@ const struct builtin_class_descr MDICLIENT_builtin_class =
 
 static MDICLIENTINFO *get_client_info( HWND client )
 {
-    MDICLIENTINFO *ret = NULL;
-    WND *win = WIN_GetPtr( client );
-    if (win)
-    {
-        if (win == WND_OTHER_PROCESS || win == WND_DESKTOP)
-        {
-            if (IsWindow(client)) WARN( "client %p belongs to other process\n", client );
-            return NULL;
-        }
-        if (win->flags & WIN_ISMDICLIENT)
-            ret = ((MDICLIENTINFO **)win->wExtra)[1];
-        else
-            WARN( "%p is not an MDI client\n", client );
-        WIN_ReleasePtr( win );
-    }
-    return ret;
+    return NtUserGetMDIClientInfo( client );
 }
 
 static BOOL is_close_enabled(HWND hwnd, HMENU hSysMenu)
@@ -1038,8 +1023,7 @@ LRESULT MDIClientWndProc_common( HWND hwnd, UINT message, WPARAM wParam, LPARAM
         if (message == WM_NCCREATE)
         {
             if (!(ci = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*ci) ))) return 0;
-            SetWindowLongPtrW( hwnd, sizeof(void *), (ULONG_PTR)ci );
-            win_set_flags( hwnd, WIN_ISMDICLIENT, 0 );
+            NtUserSetMDIClientInfo( hwnd, ci );
         }
         return unicode ? DefWindowProcW( hwnd, message, wParam, lParam ) :
                          DefWindowProcA( hwnd, message, wParam, lParam );

dlls/user32/win.c

@@ -128,7 +128,7 @@ BOOL is_desktop_window( HWND hwnd )
  * or WND_OTHER_PROCESS if handle may be valid in other process.
  * If ret value is a valid pointer, it must be released with WIN_ReleasePtr.
  */
-WND *WIN_GetPtr( HWND hwnd )
+static WND *WIN_GetPtr( HWND hwnd )
 {
     WND *ptr = (void *)NtUserCallTwoParam( HandleToUlong(hwnd), NTUSER_OBJ_WINDOW, NtUserGetHandlePtr );
     if (ptr == WND_OTHER_PROCESS && is_desktop_window( hwnd )) ptr = WND_DESKTOP;
@@ -139,7 +139,7 @@ WND *WIN_GetPtr( HWND hwnd )
 /***********************************************************************
  *           WIN_ReleasePtr
  */
-void WIN_ReleasePtr( WND *ptr )
+static void WIN_ReleasePtr( WND *ptr )
 {
     assert( ptr && ptr != OBJ_OTHER_PROCESS );
     NtUserCallOneParam( 1, NtUserLock );
@@ -169,24 +169,6 @@ HWND WIN_IsCurrentThread( HWND hwnd )
 
 
 /***********************************************************************
- *           win_set_flags
- *
- * Set the flags of a window and return the previous value.
- */
-UINT win_set_flags( HWND hwnd, UINT set_mask, UINT clear_mask )
-{
-    UINT ret;
-    WND *ptr = WIN_GetPtr( hwnd );
-
-    if (!ptr || ptr == WND_OTHER_PROCESS || ptr == WND_DESKTOP) return 0;
-    ret = ptr->flags;
-    ptr->flags = (ret & ~clear_mask) | set_mask;
-    WIN_ReleasePtr( ptr );
-    return ret;
-}
-
-
-/***********************************************************************
  *           WIN_GetFullHandle
  *
  * Convert a possibly truncated window handle to a full 32-bit handle.
@@ -494,7 +476,7 @@ HWND WIN_CreateWindowEx( CREATESTRUCTW *cs, LPCWSTR className, HINSTANCE module,
         POINT pos[2];
         UINT id = 0;
 
-        if (!(win_get_flags( cs->hwndParent ) & WIN_ISMDICLIENT))
+        if (!NtUserGetMDIClientInfo( cs->hwndParent ))
         {
             WARN("WS_EX_MDICHILD, but parent %p is not MDIClient\n", cs->hwndParent);
             return 0;

dlls/user32/win.h

@@ -36,8 +36,6 @@ struct tagDIALOGINFO;
   /* Window functions */
 extern HWND get_hwnd_message_parent(void) DECLSPEC_HIDDEN;
 extern BOOL is_desktop_window( HWND hwnd ) DECLSPEC_HIDDEN;
-extern WND *WIN_GetPtr( HWND hwnd ) DECLSPEC_HIDDEN;
-extern void WIN_ReleasePtr( WND *ptr ) DECLSPEC_HIDDEN;
 extern HWND WIN_GetFullHandle( HWND hwnd ) DECLSPEC_HIDDEN;
 extern HWND WIN_IsCurrentProcess( HWND hwnd ) DECLSPEC_HIDDEN;
 extern HWND WIN_IsCurrentThread( HWND hwnd ) DECLSPEC_HIDDEN;

dlls/win32u/window.c

@@ -5410,6 +5410,10 @@ ULONG_PTR WINAPI NtUserCallHwnd( HWND hwnd, DWORD code )
     case NtUserCallHwnd_GetDialogInfo:
         return (ULONG_PTR)get_dialog_info( hwnd );
 
+    case NtUserCallHwnd_GetMDIClientInfo:
+        if (!(win_get_flags( hwnd ) & WIN_ISMDICLIENT)) return 0;
+        return get_window_long_ptr( hwnd, sizeof(void *), FALSE );
+
     case NtUserCallHwnd_GetWindowContextHelpId:
         return get_window_context_help_id( hwnd );
 
@@ -5548,6 +5552,10 @@ ULONG_PTR WINAPI NtUserCallHwndParam( HWND hwnd, DWORD_PTR param, DWORD code )
     case NtUserCallHwndParam_SetDialogInfo:
         return set_dialog_info( hwnd, (void *)param );
 
+    case NtUserCallHwndParam_SetMDIClientInfo:
+        NtUserSetWindowLongPtr( hwnd, sizeof(void *), param, FALSE );
+        return win_set_flags( hwnd, WIN_ISMDICLIENT, 0 );
+
     case NtUserCallHwndParam_SetWindowContextHelpId:
         return set_window_context_help_id( hwnd, param );
 

include/ntuser.h

@@ -1101,6 +1101,7 @@ enum
     NtUserCallHwnd_GetDefaultImeWindow,
     NtUserCallHwnd_GetDialogInfo,
     NtUserCallHwnd_GetDpiForWindow,
+    NtUserCallHwnd_GetMDIClientInfo,
     NtUserCallHwnd_GetParent,
     NtUserCallHwnd_GetWindowContextHelpId,
     NtUserCallHwnd_GetWindowDpiAwarenessContext,
@@ -1148,6 +1149,11 @@ static inline UINT NtUserGetDpiForWindow( HWND hwnd )
     return NtUserCallHwnd( hwnd, NtUserCallHwnd_GetDpiForWindow );
 }
 
+static inline void *NtUserGetMDIClientInfo( HWND hwnd )
+{
+    return (void *)NtUserCallHwnd( hwnd, NtUserCallHwnd_GetMDIClientInfo );
+}
+
 static inline HWND NtUserGetParent( HWND hwnd )
 {
     return UlongToHandle( NtUserCallHwnd( hwnd, NtUserCallHwnd_GetParent ));
@@ -1228,6 +1234,7 @@ enum
     NtUserCallHwndParam_MonitorFromWindow,
     NtUserCallHwndParam_ScreenToClient,
     NtUserCallHwndParam_SetDialogInfo,
+    NtUserCallHwndParam_SetMDIClientInfo,
     NtUserCallHwndParam_SetWindowContextHelpId,
     NtUserCallHwndParam_SetWindowPixelFormat,
     NtUserCallHwndParam_ShowOwnedPopups,
@@ -1394,6 +1401,11 @@ static inline void NtUserSetDialogInfo( HWND hwnd, void *info )
     NtUserCallHwndParam( hwnd, (UINT_PTR)info, NtUserCallHwndParam_SetDialogInfo );
 }
 
+static inline void NtUserSetMDIClientInfo( HWND hwnd, void *info )
+{
+    NtUserCallHwndParam( hwnd, (UINT_PTR)info, NtUserCallHwndParam_SetMDIClientInfo );
+}
+
 static inline BOOL NtUserSetWindowContextHelpId( HWND hwnd, DWORD id )
 {
     return NtUserCallHwndParam( hwnd, id, NtUserCallHwndParam_SetWindowContextHelpId );