server: Post a message to the desktop window when the cursor clip rectangle changes.

dlls/user32/cursoricon.c

@@ -1718,6 +1718,7 @@ BOOL WINAPI DECLSPEC_HOTPATCH ClipCursor( const RECT *rect )
     SERVER_START_REQ( set_cursor )
     {
         req->flags    = SET_CURSOR_CLIP;
+        req->clip_msg = WM_WINE_CLIPCURSOR;
         if (rect)
         {
             req->clip.left   = rect->left;

dlls/user32/message.c

@@ -1869,6 +1869,12 @@ static LRESULT handle_internal_message( HWND hwnd, UINT msg, WPARAM wparam, LPAR
 
         return call_current_hook( h_extra->handle, HC_ACTION, wparam, h_extra->lparam );
     }
+    case WM_WINE_CLIPCURSOR:
+    {
+        RECT rect;
+        GetClipCursor( &rect );
+        return USER_Driver->pClipCursor( &rect );
+    }
     default:
         if (msg >= WM_WINE_FIRST_DRIVER_MSG && msg <= WM_WINE_LAST_DRIVER_MSG)
             return USER_Driver->pWindowMessage( hwnd, msg, wparam, lparam );

dlls/user32/user_private.h

@@ -47,6 +47,7 @@ enum wine_internal_message
     WM_WINE_SETACTIVEWINDOW,
     WM_WINE_KEYBOARD_LL_HOOK,
     WM_WINE_MOUSE_LL_HOOK,
+    WM_WINE_CLIPCURSOR,
     WM_WINE_FIRST_DRIVER_MSG = 0x80001000,  /* range of messages reserved for the USER driver */
     WM_WINE_LAST_DRIVER_MSG = 0x80001fff
 };

dlls/winex11.drv/xinerama.c

@@ -197,7 +197,6 @@ void xinerama_init( unsigned int width, unsigned int height )
            wine_dbgstr_rect(&rect), screen_width, screen_height );
 
     wine_tsx11_unlock();
-    ClipCursor( NULL );  /* reset the cursor clip rectangle */
 }
 
 

include/wine/server_protocol.h

@@ -4798,6 +4798,8 @@ struct set_cursor_request
     int            x;
     int            y;
     rectangle_t    clip;
+    unsigned int   clip_msg;
+    char __pad_52[4];
 };
 struct set_cursor_reply
 {
@@ -5561,6 +5563,6 @@ union generic_reply
     struct set_cursor_reply set_cursor_reply;
 };
 
-#define SERVER_PROTOCOL_VERSION 418
+#define SERVER_PROTOCOL_VERSION 419
 
 #endif /* __WINE_WINE_SERVER_PROTOCOL_H */

programs/explorer/desktop.c

@@ -334,6 +334,7 @@ void manage_desktop( WCHAR *arg )
         if (name) set_desktop_window_title( hwnd, name );
         SystemParametersInfoA( SPI_SETDESKPATTERN, -1, NULL, FALSE );
         SetDeskWallPaper( (LPSTR)-1 );
+        ClipCursor( NULL );
         initialize_display_settings( hwnd );
         initialize_appbar();
         initialize_systray( using_root );

server/protocol.def

@@ -3318,6 +3318,7 @@ enum coords_relative
     int            x;             /* cursor position */
     int            y;
     rectangle_t    clip;          /* cursor clip rectangle */
+    unsigned int   clip_msg;      /* message to post on cursor clip changes */
 @REPLY
     user_handle_t  prev_handle;   /* previous handle */
     int            prev_count;    /* previous show count */

server/queue.c

@@ -318,11 +318,23 @@ static int assign_thread_input( struct thread *thread, struct thread_input *new_
     return 1;
 }
 
+/* set the cursor clip rectangle */
+static void set_clip_rectangle( struct desktop *desktop, const rectangle_t *rect )
+{
+    rectangle_t top_rect, new_rect;
+
+    get_top_window_rectangle( desktop, &top_rect );
+    if (!rect || !intersect_rect( &new_rect, &top_rect, rect )) new_rect = top_rect;
+    if (!memcmp( &desktop->cursor.clip, &new_rect, sizeof(new_rect) )) return;
+    desktop->cursor.clip = new_rect;
+    if (desktop->cursor.clip_msg) post_desktop_message( desktop, desktop->cursor.clip_msg, 0, 0 );
+}
+
 /* change the foreground input and reset the cursor clip rect */
 static void set_foreground_input( struct desktop *desktop, struct thread_input *input )
 {
     if (desktop->foreground_input == input) return;
-    get_top_window_rectangle( desktop, &desktop->cursor.clip );
+    set_clip_rectangle( desktop, NULL );
     desktop->foreground_input = input;
 }
 
@@ -2620,10 +2632,13 @@ DECL_HANDLER(set_cursor)
     }
     if (req->flags & SET_CURSOR_CLIP)
     {
-        rectangle_t top_rect;
-        get_top_window_rectangle( input->desktop, &top_rect );
-        if (!intersect_rect( &input->desktop->cursor.clip, &top_rect, &req->clip ))
-            input->desktop->cursor.clip = top_rect;
+        struct desktop *desktop = input->desktop;
+
+        /* only the desktop owner can set the message */
+        if (req->clip_msg && get_top_window_owner(desktop) == current->process)
+            desktop->cursor.clip_msg = req->clip_msg;
+
+        set_clip_rectangle( desktop, &req->clip );
     }
 
     reply->new_x       = input->desktop->cursor.x;

server/request.h

@@ -2097,7 +2097,8 @@ C_ASSERT( FIELD_OFFSET(struct set_cursor_request, show_count) == 20 );
 C_ASSERT( FIELD_OFFSET(struct set_cursor_request, x) == 24 );
 C_ASSERT( FIELD_OFFSET(struct set_cursor_request, y) == 28 );
 C_ASSERT( FIELD_OFFSET(struct set_cursor_request, clip) == 32 );
-C_ASSERT( sizeof(struct set_cursor_request) == 48 );
+C_ASSERT( FIELD_OFFSET(struct set_cursor_request, clip_msg) == 48 );
+C_ASSERT( sizeof(struct set_cursor_request) == 56 );
 C_ASSERT( FIELD_OFFSET(struct set_cursor_reply, prev_handle) == 8 );
 C_ASSERT( FIELD_OFFSET(struct set_cursor_reply, prev_count) == 12 );
 C_ASSERT( FIELD_OFFSET(struct set_cursor_reply, new_x) == 16 );

server/trace.c

@@ -3896,6 +3896,7 @@ static void dump_set_cursor_request( const struct set_cursor_request *req )
     fprintf( stderr, ", x=%d", req->x );
     fprintf( stderr, ", y=%d", req->y );
     dump_rectangle( ", clip=", &req->clip );
+    fprintf( stderr, ", clip_msg=%08x", req->clip_msg );
 }
 
 static void dump_set_cursor_reply( const struct set_cursor_reply *req )

server/user.h

@@ -56,6 +56,7 @@ struct global_cursor
     int                  x;                /* cursor position */
     int                  y;
     rectangle_t          clip;             /* cursor clip rectangle */
+    unsigned int         clip_msg;         /* message to post for cursor clip changes */
     unsigned int         last_change;      /* time of last position change */
 };