[PATCH] winex11.drv/mouse: Use root-relative coordinates for events, if possible

Gabriel Ivăncescu gabrielopcode at gmail.com
Tue Jan 29 05:49:51 CST 2019


Some applications control their own position when they are being moved. Since
events' x and y fields are reported relative to the window, this can
apparently result in them being out of sync from the X server side and ours
(hwnd). This makes applications like Winamp go nuts when they are being
moved and move all over the place "randomly".

The solution is to use x_root and y_root instead, when the root is the
same as our root_window, which solves this issue. The final coordinates
will have to be relative to the virtual screen anyway so this actually
simplifies most of the code in send_mouse_input.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46309
Signed-off-by: Gabriel Ivăncescu <gabrielopcode at gmail.com>
---

I don't know if the root_window check is needed, honestly. I know little
about the X server, this was just discovered by debugging and looking it up.

If it's not needed, then the code can be simplified considerably, and
the map_to_root_coords helper function can be removed. Someone with more
experience in the X11 code should know this.

I've been running this patch for a few weeks now in my day-to-day Wine
usage, with no problems with any app I used (granted my usage is not
all-encompassing), so I am actually wondering why it wasn't done like this
in the first place. Hopefully I'm not missing anything.

 dlls/winex11.drv/mouse.c | 100 ++++++++++++++++++++++++---------------
 1 file changed, 62 insertions(+), 38 deletions(-)

diff --git a/dlls/winex11.drv/mouse.c b/dlls/winex11.drv/mouse.c
index d678706..b12e214 100644
--- a/dlls/winex11.drv/mouse.c
+++ b/dlls/winex11.drv/mouse.c
@@ -554,6 +554,32 @@ static BOOL is_old_motion_event( unsigned long serial )
 }
 
 
+/***********************************************************************
+ *		map_to_root_coords
+ *
+ * Map the window-relative coordinates so they're relative to the root.
+ */
+static POINT map_to_root_coords(HWND hwnd, Window window, int x, int y)
+{
+    struct x11drv_win_data *data;
+    POINT pt = { x, y };
+
+    if (!(data = get_win_data(hwnd))) return pt;
+    if (window == data->whole_window)
+    {
+        pt.x += data->whole_rect.left - data->client_rect.left;
+        pt.y += data->whole_rect.top - data->client_rect.top;
+    }
+
+    if (GetWindowLongW(hwnd, GWL_EXSTYLE) & WS_EX_LAYOUTRTL)
+        pt.x = data->client_rect.right - data->client_rect.left - 1 - pt.x;
+    release_win_data(data);
+    MapWindowPoints(hwnd, 0, &pt, 1);
+
+    return pt;
+}
+
+
 /***********************************************************************
  *		send_mouse_input
  *
@@ -562,7 +588,6 @@ static BOOL is_old_motion_event( unsigned long serial )
 static void send_mouse_input( HWND hwnd, Window window, unsigned int state, INPUT *input )
 {
     struct x11drv_win_data *data;
-    POINT pt;
 
     input->type = INPUT_MOUSE;
 
@@ -585,32 +610,14 @@ static void send_mouse_input( HWND hwnd, Window window, unsigned int state, INPU
         return;
     }
 
-    if (window != root_window)
-    {
-        pt.x = input->u.mi.dx;
-        pt.y = input->u.mi.dy;
-    }
-    else pt = root_to_virtual_screen( input->u.mi.dx, input->u.mi.dy );
-
-    if (!(data = get_win_data( hwnd ))) return;
-
-    if (window == data->whole_window)
-    {
-        pt.x += data->whole_rect.left - data->client_rect.left;
-        pt.y += data->whole_rect.top - data->client_rect.top;
-    }
-
-    if (GetWindowLongW( data->hwnd, GWL_EXSTYLE ) & WS_EX_LAYOUTRTL)
-        pt.x = data->client_rect.right - data->client_rect.left - 1 - pt.x;
-    MapWindowPoints( hwnd, 0, &pt, 1 );
-
-    if (InterlockedExchangePointer( (void **)&cursor_window, hwnd ) != hwnd ||
-        input->u.mi.time - last_cursor_change > 100)
+    if ((InterlockedExchangePointer( (void **)&cursor_window, hwnd ) != hwnd ||
+         input->u.mi.time - last_cursor_change > 100) &&
+        (data = get_win_data( hwnd )))
     {
         sync_window_cursor( data->whole_window );
         last_cursor_change = input->u.mi.time;
+        release_win_data( data );
     }
-    release_win_data( data );
 
     if (hwnd != GetDesktopWindow())
     {
@@ -625,8 +632,7 @@ static void send_mouse_input( HWND hwnd, Window window, unsigned int state, INPU
         /* ignore event if a button is pressed, since the mouse is then grabbed too */
         !(state & (Button1Mask|Button2Mask|Button3Mask|Button4Mask|Button5Mask|Button6Mask|Button7Mask)))
     {
-        RECT rect;
-        SetRect( &rect, pt.x, pt.y, pt.x + 1, pt.y + 1 );
+        RECT rect = { input->u.mi.dx, input->u.mi.dy, input->u.mi.dx + 1, input->u.mi.dy + 1 };
 
         SERVER_START_REQ( update_window_zorder )
         {
@@ -640,8 +646,6 @@ static void send_mouse_input( HWND hwnd, Window window, unsigned int state, INPU
         SERVER_END_REQ;
     }
 
-    input->u.mi.dx = pt.x;
-    input->u.mi.dy = pt.y;
     __wine_send_input( hwnd, input );
 }
 
@@ -1598,13 +1602,18 @@ BOOL X11DRV_ButtonPress( HWND hwnd, XEvent *xev )
     XButtonEvent *event = &xev->xbutton;
     int buttonNum = event->button - 1;
     INPUT input;
+    POINT pt;
 
     if (buttonNum >= NB_BUTTONS) return FALSE;
 
-    TRACE( "hwnd %p/%lx button %u pos %d,%d\n", hwnd, event->window, buttonNum, event->x, event->y );
+    pt = root_to_virtual_screen(event->x_root, event->y_root);
+    if (event->root != root_window || !event->same_screen)
+        pt = map_to_root_coords(hwnd, event->window, event->x, event->y);
+
+    TRACE( "hwnd %p/%lx button %u pos %d,%d\n", hwnd, event->window, buttonNum, pt.x, pt.y );
 
-    input.u.mi.dx          = event->x;
-    input.u.mi.dy          = event->y;
+    input.u.mi.dx          = pt.x;
+    input.u.mi.dy          = pt.y;
     input.u.mi.mouseData   = button_down_data[buttonNum];
     input.u.mi.dwFlags     = button_down_flags[buttonNum] | MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE;
     input.u.mi.time        = EVENT_x11_time_to_win32_time( event->time );
@@ -1624,13 +1633,18 @@ BOOL X11DRV_ButtonRelease( HWND hwnd, XEvent *xev )
     XButtonEvent *event = &xev->xbutton;
     int buttonNum = event->button - 1;
     INPUT input;
+    POINT pt;
 
     if (buttonNum >= NB_BUTTONS || !button_up_flags[buttonNum]) return FALSE;
 
-    TRACE( "hwnd %p/%lx button %u pos %d,%d\n", hwnd, event->window, buttonNum, event->x, event->y );
+    pt = root_to_virtual_screen(event->x_root, event->y_root);
+    if (event->root != root_window || !event->same_screen)
+        pt = map_to_root_coords(hwnd, event->window, event->x, event->y);
+
+    TRACE( "hwnd %p/%lx button %u pos %d,%d\n", hwnd, event->window, buttonNum, pt.x, pt.y );
 
-    input.u.mi.dx          = event->x;
-    input.u.mi.dy          = event->y;
+    input.u.mi.dx          = pt.x;
+    input.u.mi.dy          = pt.y;
     input.u.mi.mouseData   = button_up_data[buttonNum];
     input.u.mi.dwFlags     = button_up_flags[buttonNum] | MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE;
     input.u.mi.time        = EVENT_x11_time_to_win32_time( event->time );
@@ -1648,12 +1662,17 @@ BOOL X11DRV_MotionNotify( HWND hwnd, XEvent *xev )
 {
     XMotionEvent *event = &xev->xmotion;
     INPUT input;
+    POINT pt;
+
+    pt = root_to_virtual_screen(event->x_root, event->y_root);
+    if (event->root != root_window || !event->same_screen)
+        pt = map_to_root_coords(hwnd, event->window, event->x, event->y);
 
     TRACE( "hwnd %p/%lx pos %d,%d is_hint %d serial %lu\n",
-           hwnd, event->window, event->x, event->y, event->is_hint, event->serial );
+           hwnd, event->window, pt.x, pt.y, event->is_hint, event->serial );
 
-    input.u.mi.dx          = event->x;
-    input.u.mi.dy          = event->y;
+    input.u.mi.dx          = pt.x;
+    input.u.mi.dy          = pt.y;
     input.u.mi.mouseData   = 0;
     input.u.mi.dwFlags     = MOUSEEVENTF_MOVE | MOUSEEVENTF_ABSOLUTE;
     input.u.mi.time        = EVENT_x11_time_to_win32_time( event->time );
@@ -1676,6 +1695,7 @@ BOOL X11DRV_EnterNotify( HWND hwnd, XEvent *xev )
 {
     XCrossingEvent *event = &xev->xcrossing;
     INPUT input;
+    POINT pt;
 
     TRACE( "hwnd %p/%lx pos %d,%d detail %d\n", hwnd, event->window, event->x, event->y, event->detail );
 
@@ -1683,8 +1703,12 @@ BOOL X11DRV_EnterNotify( HWND hwnd, XEvent *xev )
     if (hwnd == x11drv_thread_data()->grab_hwnd) return FALSE;
 
     /* simulate a mouse motion event */
-    input.u.mi.dx          = event->x;
-    input.u.mi.dy          = event->y;
+    pt = root_to_virtual_screen(event->x_root, event->y_root);
+    if (event->root != root_window || !event->same_screen)
+        pt = map_to_root_coords(hwnd, event->window, event->x, event->y);
+
+    input.u.mi.dx          = pt.x;
+    input.u.mi.dy          = pt.y;
     input.u.mi.mouseData   = 0;
     input.u.mi.dwFlags     = MOUSEEVENTF_MOVE | MOUSEEVENTF_ABSOLUTE;
     input.u.mi.time        = EVENT_x11_time_to_win32_time( event->time );
-- 
2.19.1




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