[PATCH 1/1] winex11: Replace the clipping message HWND with a BOOL flag.

[Rémi Bernon]

From: Rémi Bernon

We don't need the window anymore, it was only used to send ClipCursor
notifications. This improves cursor clipping performance a lot as it
avoids re-creating a window every time.
---
 dlls/winex11.drv/mouse.c  | 28 +++++++---------------------
 dlls/winex11.drv/x11drv.h |  2 +-
 2 files changed, 8 insertions(+), 22 deletions(-)

diff --git a/dlls/winex11.drv/mouse.c b/dlls/winex11.drv/mouse.c
index 46d26726264..3248639f1f3 100644
--- a/dlls/winex11.drv/mouse.c
+++ b/dlls/winex11.drv/mouse.c
@@ -351,11 +351,8 @@ static void disable_xinput2(void)
 static BOOL grab_clipping_window( const RECT *clip )
 {
 #ifdef HAVE_X11_EXTENSIONS_XINPUT2_H
-    static const WCHAR messageW[] = {'M','e','s','s','a','g','e',0};
     struct x11drv_thread_data *data = x11drv_thread_data();
-    UNICODE_STRING class_name = RTL_CONSTANT_STRING( messageW );
     Window clip_window;
-    HWND msg_hwnd = 0;
     HCURSOR cursor;
     POINT pos;

@@ -365,11 +362,6 @@ static BOOL grab_clipping_window( const RECT *clip )
     if (!data) return FALSE;
     if (!(clip_window = init_clip_window())) return TRUE;

-    if (!(msg_hwnd = NtUserCreateWindowEx( 0, &class_name, &class_name, NULL, 0, 0, 0, 0, 0,
-                                           HWND_MESSAGE, 0, NtCurrentTeb()->Peb->ImageBaseAddress,
-                                           NULL, 0, NULL, 0, FALSE )))
-        return TRUE;
-
     if (keyboard_grabbed)
     {
         WARN( "refusing to clip to %s\n", wine_dbgstr_rect(clip) );
@@ -384,26 +376,25 @@ static BOOL grab_clipping_window( const RECT *clip )
     }

/* enable XInput2 unless we are already clipping */
-    if (!data->clip_hwnd) enable_xinput2();
+    if (!data->clipping_cursor) enable_xinput2();

if (data->xi2_state != xi_enabled)
     {
         WARN( "XInput2 not supported, refusing to clip to %s\n", wine_dbgstr_rect(clip) );
-        NtUserDestroyWindow( msg_hwnd );
         NtUserClipCursor( NULL );
         return TRUE;
     }

TRACE( "clipping to %s win %lx\n", wine_dbgstr_rect(clip), clip_window );

-    if (!data->clip_hwnd) XUnmapWindow( data->display, clip_window );
+    if (!data->clipping_cursor) XUnmapWindow( data->display, clip_window );
     pos = virtual_screen_to_root( clip->left, clip->top );
     XMoveResizeWindow( data->display, clip_window, pos.x, pos.y,
                        max( 1, clip->right - clip->left ), max( 1, clip->bottom - clip->top ) );
     XMapWindow( data->display, clip_window );

/* if the rectangle is shrinking we may get a pointer warp */
-    if (!data->clip_hwnd || clip->left > clip_rect.left || clip->top > clip_rect.top ||
+    if (!data->clipping_cursor || clip->left > clip_rect.left || clip->top > clip_rect.top ||
         clip->right < clip_rect.right || clip->bottom < clip_rect.bottom)
         data->warp_serial = NextRequest( data->display );

@@ -426,11 +417,10 @@ static BOOL grab_clipping_window( const RECT *clip )
     if (!clipping_cursor)
     {
         disable_xinput2();
-        NtUserDestroyWindow( msg_hwnd );
         return FALSE;
     }
     clip_rect = *clip;
-    data->clip_hwnd = msg_hwnd;
+    data->clipping_cursor = TRUE;
     return TRUE;
 #else
     WARN( "XInput2 was not available at compile time\n" );
@@ -454,8 +444,7 @@ static void ungrab_clipping_window(void)
     XUnmapWindow( data->display, clip_window );
     if (clipping_cursor) XUngrabPointer( data->display, CurrentTime );
     clipping_cursor = FALSE;
-    NtUserDestroyWindow( data->clip_hwnd );
-    data->clip_hwnd = 0;
+    data->clipping_cursor = FALSE;
     disable_xinput2();
 }

@@ -505,7 +494,7 @@ static void map_event_coords( HWND hwnd, Window window, Window event_root, int x
     if (!hwnd)
     {
         thread_data = x11drv_thread_data();
-        if (!thread_data->clip_hwnd) return;
+        if (!thread_data->clipping_cursor) return;
         if (thread_data->clip_window != window) return;
         pt.x += clip_rect.left;
         pt.y += clip_rect.top;
@@ -549,10 +538,7 @@ static void send_mouse_input( HWND hwnd, Window window, unsigned int state, INPU
     if (!hwnd)
     {
         struct x11drv_thread_data *thread_data = x11drv_thread_data();
-        HWND clip_hwnd = thread_data->clip_hwnd;
-
-        if (!clip_hwnd) return;
-        if (thread_data->clip_window != window) return;
+        if (!thread_data->clipping_cursor || thread_data->clip_window != window) return;
         __wine_send_input( hwnd, input, NULL );
         return;
     }
diff --git a/dlls/winex11.drv/x11drv.h b/dlls/winex11.drv/x11drv.h
index 8827d0cc0c2..8ab7903fb51 100644
--- a/dlls/winex11.drv/x11drv.h
+++ b/dlls/winex11.drv/x11drv.h
@@ -388,7 +388,7 @@ struct x11drv_thread_data
     Window   selection_wnd;        /* window used for selection interactions */
     unsigned long warp_serial;     /* serial number of last pointer warp request */
     Window   clip_window;          /* window used for cursor clipping */
-    HWND     clip_hwnd;            /* message window stored in desktop while clipping is active */
+    BOOL     clipping_cursor;      /* whether thread is currently clipping the cursor */
 #ifdef HAVE_X11_EXTENSIONS_XINPUT2_H
     enum { xi_unavailable = -1, xi_unknown, xi_disabled, xi_enabled } xi2_state; /* XInput2 state */
     void    *xi2_devices;          /* list of XInput2 devices (valid when state is enabled) */