[PATCH 0/1] MR8597: winex11.drv: Implement WS_EX_TRANSPARENT mouse pass-through with ShapeInput extension

[Jiajin Cui (＠jin-king1)]

- Add sync_window_input_shape() function to handle ShapeInput operations
- Modify get_window_attributes() to exclude mouse events for transparent windows
- Update sync_window_style() to call sync_window_input_shape()
- Handle WS_EX_TRANSPARENT style changes in X11DRV_SetWindowStyle()
- Ensure proper input shape setup in create_whole_window()

This implementation uses both event mask control and ShapeInput extension
to provide accurate mouse pass-through functionality for windows with
WS_EX_TRANSPARENT extended style. When a window has this style, mouse
events will pass through to underlying windows while still allowing
keyboard and focus events.

[PATCH 1/1] winex11.drv: Implement WS_EX_TRANSPARENT mouse pass-through with ShapeInput extension

[Jiajin Cui]

From: Jiajin Cui

- Add sync_window_input_shape() function to handle ShapeInput operations
- Modify get_window_attributes() to exclude mouse events for transparent windows
- Update sync_window_style() to call sync_window_input_shape()
- Handle WS_EX_TRANSPARENT style changes in X11DRV_SetWindowStyle()
- Ensure proper input shape setup in create_whole_window()

This implementation uses both event mask control and ShapeInput extension
to provide accurate mouse pass-through functionality for windows with
WS_EX_TRANSPARENT extended style. When a window has this style, mouse
events will pass through to underlying windows while still allowing
keyboard and focus events.
---
 dlls/winex11.drv/window.c | 78 +++++++++++++++++++++++++++++++++++----
 1 file changed, 70 insertions(+), 8 deletions(-)

diff --git a/dlls/winex11.drv/window.c b/dlls/winex11.drv/window.c
index b9055791a60..700a8b3bd41 100644
--- a/dlls/winex11.drv/window.c
+++ b/dlls/winex11.drv/window.c
@@ -487,21 +487,67 @@ static unsigned long get_mwm_decorations( struct x11drv_win_data *data, DWORD st
  */
 static int get_window_attributes( struct x11drv_win_data *data, XSetWindowAttributes *attr )
 {
+    DWORD ex_style = NtUserGetWindowLongW( data->hwnd, GWL_EXSTYLE );
+
     attr->colormap          = data->whole_colormap ? data->whole_colormap : default_colormap;
     attr->save_under        = ((NtUserGetClassLongW( data->hwnd, GCL_STYLE ) & CS_SAVEBITS) != 0);
     attr->bit_gravity       = NorthWestGravity;
     attr->backing_store     = NotUseful;
     attr->border_pixel      = 0;
     attr->background_pixel  = 0;
-    attr->event_mask        = (ExposureMask | PointerMotionMask |
-                               ButtonPressMask | ButtonReleaseMask | EnterWindowMask |
-                               KeyPressMask | KeyReleaseMask | FocusChangeMask |
-                               KeymapStateMask | StructureNotifyMask | PropertyChangeMask);
+
+    /* Set event mask based on WS_EX_TRANSPARENT style */
+    if (ex_style & WS_EX_TRANSPARENT)
+    {
+        /* For transparent windows, exclude mouse events to allow mouse pass-through */
+        attr->event_mask = (ExposureMask | KeyPressMask | KeyReleaseMask |
+                           FocusChangeMask | KeymapStateMask | StructureNotifyMask | PropertyChangeMask);
+    }
+    else
+    {
+        /* Normal event mask including mouse events */
+        attr->event_mask = (ExposureMask | PointerMotionMask |
+                           ButtonPressMask | ButtonReleaseMask | EnterWindowMask |
+                           KeyPressMask | KeyReleaseMask | FocusChangeMask |
+                           KeymapStateMask | StructureNotifyMask | PropertyChangeMask);
+    }

return (CWSaveUnder | CWColormap | CWBorderPixel | CWBackPixel |
             CWEventMask | CWBitGravity | CWBackingStore);
 }

+/***********************************************************************
+ *              sync_window_input_shape
+ *
+ * Update the X11 window input shape for WS_EX_TRANSPARENT windows.
+ * This uses the ShapeInput extension to control which areas of the window
+ * can receive input events.
+ */
+static void sync_window_input_shape( struct x11drv_win_data *data )
+{
+#ifdef HAVE_LIBXSHAPE
+    DWORD ex_style = NtUserGetWindowLongW( data->hwnd, GWL_EXSTYLE );
+
+    if (!data->whole_window) return;
+
+    if (ex_style & WS_EX_TRANSPARENT)
+    {
+        /* For transparent windows, set an empty input shape to allow mouse pass-through */
+        static XRectangle empty_rect;
+        XShapeCombineRectangles( data->display, data->whole_window, ShapeInput, 0, 0,
+                                 &empty_rect, 1, ShapeSet, YXBanded );
+        TRACE( "window %p/%lx set empty input shape for WS_EX_TRANSPARENT\n",
+               data->hwnd, data->whole_window );
+    }
+    else
+    {
+        /* For normal windows, reset input shape to default (full window) */
+        XShapeCombineMask( data->display, data->whole_window, ShapeInput, 0, 0, None, ShapeSet );
+        TRACE( "window %p/%lx reset input shape to default\n",
+               data->hwnd, data->whole_window );
+    }
+#endif
+}

/***********************************************************************
  *              sync_window_style
@@ -519,6 +565,9 @@ static void sync_window_style( struct x11drv_win_data *data )
                data->whole_window, mask, NextRequest( data->display ) );
         XChangeWindowAttributes( data->display, data->whole_window, mask, &attr );
         x11drv_xinput2_enable( data->display, data->whole_window );
+
+        /* Sync input shape for WS_EX_TRANSPARENT windows */
+        sync_window_input_shape( data );
     }
 }

@@ -2395,6 +2444,9 @@ static void create_whole_window( struct x11drv_win_data *data )
     if (!NtUserGetLayeredWindowAttributes( data->hwnd, &key, &alpha, &layered_flags )) layered_flags = 0;
     sync_window_opacity( data->display, data->whole_window, alpha, layered_flags );

+    /* set the input shape for WS_EX_TRANSPARENT windows */
+    sync_window_input_shape( data );
+
     XFlush( data->display );  /* make sure the window exists before we start painting to it */

done:
@@ -2520,11 +2572,21 @@ void X11DRV_SetWindowStyle( HWND hwnd, INT offset, STYLESTRUCT *style )

if (offset == GWL_STYLE && (changed & WS_DISABLED)) set_wm_hints( data );

-    if (offset == GWL_EXSTYLE && (changed & WS_EX_LAYERED)) /* changing WS_EX_LAYERED resets attributes */
+    if (offset == GWL_EXSTYLE)
     {
-        data->layered = FALSE;
-        set_window_visual( data, &default_visual, FALSE );
-        sync_window_opacity( data->display, data->whole_window, 0, 0 );
+        if (changed & WS_EX_LAYERED) /* changing WS_EX_LAYERED resets attributes */
+        {
+            data->layered = FALSE;
+            set_window_visual( data, &default_visual, FALSE );
+            sync_window_opacity( data->display, data->whole_window, 0, 0 );
+        }
+
+        /* Handle WS_EX_TRANSPARENT style changes */
+        if (changed & WS_EX_TRANSPARENT)
+        {
+            TRACE( "window %p WS_EX_TRANSPARENT style changed, syncing window attributes\n", hwnd );
+            sync_window_style( data );
+        }
     }
 done:
     release_win_data( data );

[Jiajin Cui (＠jin-king1)]

[test_transparent.c](/uploads/7b601a28170159209e13deb23b8a8c1f/test_transparent.c)