win32u: Move NtUserPostMessage implementation from user32.

dlls/user32/user_main.c

@@ -164,7 +164,6 @@ static const struct user_callbacks user_funcs =
     DestroyCaret,
     EndMenu,
     HideCaret,
-    PostMessageW,
     SetSystemMenu,
     ShowCaret,
     free_menu_items,

dlls/win32u/gdiobj.c

@@ -1193,6 +1193,7 @@ static struct unix_funcs unix_funcs =
     NtUserMoveWindow,
     NtUserMsgWaitForMultipleObjectsEx,
     NtUserPeekMessage,
+    NtUserPostMessage,
     NtUserPostThreadMessage,
     NtUserRedrawWindow,
     NtUserRegisterClassExWOW,

dlls/win32u/message.c

@@ -2402,9 +2402,33 @@ static BOOL send_message_callback( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lp
  */
 BOOL WINAPI NtUserPostMessage( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
 {
-    /* FIXME: move implementation from user32 */
-    if (!user_callbacks) return 0;
-    return user_callbacks->pPostMessageW( hwnd, msg, wparam, lparam );
+    struct send_message_info info;
+
+    if (is_pointer_message( msg, wparam ))
+    {
+        SetLastError( ERROR_MESSAGE_SYNC_ONLY );
+        return FALSE;
+    }
+
+    TRACE( "hwnd %p msg %x (%s) wp %lx lp %lx\n",
+           hwnd, msg, debugstr_msg_name(msg, hwnd), wparam, lparam );
+
+    info.type   = MSG_POSTED;
+    info.hwnd   = hwnd;
+    info.msg    = msg;
+    info.wparam = wparam;
+    info.lparam = lparam;
+    info.flags  = 0;
+
+    if (is_broadcast(hwnd)) return broadcast_message( &info, NULL );
+
+    if (!hwnd) return NtUserPostThreadMessage( GetCurrentThreadId(), msg, wparam, lparam );
+
+    if (!(info.dest_tid = get_window_thread( hwnd, NULL ))) return FALSE;
+
+    if (is_exiting_thread( info.dest_tid )) return TRUE;
+
+    return put_message_in_queue( &info, NULL );
 }
 
 /**********************************************************************

dlls/win32u/ntuser_private.h

@@ -37,7 +37,6 @@ struct user_callbacks
     BOOL (WINAPI *pDestroyCaret)(void);
     BOOL (WINAPI *pEndMenu)(void);
     BOOL (WINAPI *pHideCaret)( HWND hwnd );
-    BOOL (WINAPI *pPostMessageW)( HWND, UINT, WPARAM, LPARAM );
     BOOL (WINAPI *pSetSystemMenu)( HWND hwnd, HMENU menu );
     BOOL (WINAPI *pShowCaret)( HWND hwnd );
     void (CDECL *free_menu_items)( void *ptr );

dlls/win32u/win32u.spec

@@ -1103,7 +1103,7 @@
 @ stub NtUserPhysicalToLogicalDpiPointForWindow
 @ stub NtUserPhysicalToLogicalPoint
 @ stub NtUserPostKeyboardInputMessage
-@ stub NtUserPostMessage
+@ stdcall NtUserPostMessage(long long long long)
 @ stdcall NtUserPostThreadMessage(long long long long)
 @ stub NtUserPrintWindow
 @ stub NtUserProcessConnect

dlls/win32u/win32u_private.h

@@ -242,6 +242,7 @@ struct unix_funcs
     DWORD    (WINAPI *pNtUserMsgWaitForMultipleObjectsEx)( DWORD count, const HANDLE *handles,
                                                            DWORD timeout, DWORD mask, DWORD flags );
     BOOL     (WINAPI *pNtUserPeekMessage)( MSG *msg_out, HWND hwnd, UINT first, UINT last, UINT flags );
+    BOOL     (WINAPI *pNtUserPostMessage)( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam );
     BOOL     (WINAPI *pNtUserPostThreadMessage)( DWORD thread, UINT msg, WPARAM wparam, LPARAM lparam );
     BOOL     (WINAPI *pNtUserRedrawWindow)( HWND hwnd, const RECT *rect, HRGN hrgn, UINT flags );
     ATOM     (WINAPI *pNtUserRegisterClassExWOW)( const WNDCLASSEXW *wc, UNICODE_STRING *name,

dlls/win32u/wrappers.c

@@ -977,6 +977,12 @@ BOOL WINAPI NtUserPeekMessage( MSG *msg_out, HWND hwnd, UINT first, UINT last, U
     return unix_funcs->pNtUserPeekMessage( msg_out, hwnd, first, last, flags );
 }
 
+BOOL WINAPI NtUserPostMessage( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
+{
+    if (!unix_funcs) return FALSE;
+    return unix_funcs->pNtUserPostMessage( hwnd, msg, wparam, lparam );
+}
+
 BOOL WINAPI NtUserPostThreadMessage( DWORD thread, UINT msg, WPARAM wparam, LPARAM lparam )
 {
     if (!unix_funcs) return FALSE;