win32u: Introduce NtUserSendDriverMessage.

dlls/win32u/message.c

@@ -3209,6 +3209,10 @@ LRESULT WINAPI NtUserMessageCall( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lpa
         else RtlSetLastWin32Error( ERROR_MESSAGE_SYNC_ONLY );
         return FALSE;
 
+    case NtUserSendDriverMessage:
+        /* used by driver to send packed messages */
+        return send_message( hwnd, msg, wparam, lparam );
+
     case NtUserSpyEnter:
         spy_enter_message( ansi, hwnd, msg, wparam, lparam );
         return 0;

dlls/winemac.drv/macdrv.h

@@ -289,7 +289,7 @@ extern NTSTATUS macdrv_client_func(enum macdrv_client_funcs func, const void *pa
 
 static inline LRESULT send_message(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
 {
-    return NtUserMessageCall(hwnd, msg, wparam, lparam, NULL, NtUserSendMessage, FALSE);
+    return NtUserMessageCall(hwnd, msg, wparam, lparam, NULL, NtUserSendDriverMessage, FALSE);
 }
 
 static inline LRESULT send_message_timeout(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam,

dlls/winex11.drv/x11drv.h

@@ -861,7 +861,7 @@ static inline UINT get_palette_entries( HPALETTE palette, UINT start, UINT count
 
 static inline LRESULT send_message( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
 {
-    return NtUserMessageCall( hwnd, msg, wparam, lparam, NULL, NtUserSendMessage, FALSE );
+    return NtUserMessageCall( hwnd, msg, wparam, lparam, NULL, NtUserSendDriverMessage, FALSE );
 }
 
 static inline LRESULT send_message_timeout( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam,

include/ntuser.h

@@ -297,10 +297,11 @@ enum
     /* Wine-specific exports */
     NtUserClipboardWindowProc = 0x0300,
     NtUserGetDispatchParams   = 0x3001,
-    NtUserSpyGetMsgName       = 0x3002,
-    NtUserSpyEnter            = 0x0303,
-    NtUserSpyExit             = 0x0304,
-    NtUserWinProcResult       = 0x0305,
+    NtUserSendDriverMessage   = 0x3002,
+    NtUserSpyGetMsgName       = 0x3003,
+    NtUserSpyEnter            = 0x0304,
+    NtUserSpyExit             = 0x0305,
+    NtUserWinProcResult       = 0x0306,
 };
 
 /* NtUserThunkedMenuItemInfo codes */