[PATCH xwayland] xwayland: Keep separate variables for pointer and tablet foci

[Carlos Garnacho]

The tablet/stylus interfaces reused xwl_seat->focus_window, which
would leave a somewhat inconsistent state of that variable for
wl_pointer purposes (basically, everything) if the pointer happened
to lay on the same surface than the stylus while proximity_out
happens.

We just want the stylus xwl_window to correctly determine we have
stylus focus, and to correctly translate surface-local coordinates
to root coordinates, this can be done using a different variable.

Signed-off-by: Carlos Garnacho <carlosg at gnome.org>
---
 hw/xwayland/xwayland-input.c | 20 ++++++++++----------
 hw/xwayland/xwayland.c       |  2 ++
 hw/xwayland/xwayland.h       |  1 +
 3 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/hw/xwayland/xwayland-input.c b/hw/xwayland/xwayland-input.c
index 68e365051..439903032 100644
--- a/hw/xwayland/xwayland-input.c
+++ b/hw/xwayland/xwayland-input.c
@@ -1514,7 +1514,7 @@ tablet_tool_proximity_in(void *data, struct zwp_tablet_tool_v2 *tool,
         return;
 
     xwl_tablet_tool->proximity_in_serial = serial;
-    xwl_seat->focus_window = wl_surface_get_user_data(wl_surface);
+    xwl_seat->tablet_focus_window = wl_surface_get_user_data(wl_surface);
 
     xwl_tablet_tool_set_cursor(xwl_tablet_tool);
 }
@@ -1526,7 +1526,7 @@ tablet_tool_proximity_out(void *data, struct zwp_tablet_tool_v2 *tool)
     struct xwl_seat *xwl_seat = xwl_tablet_tool->seat;
 
     xwl_tablet_tool->proximity_in_serial = 0;
-    xwl_seat->focus_window = NULL;
+    xwl_seat->tablet_focus_window = NULL;
 
     xwl_tablet_tool->pressure = 0;
     xwl_tablet_tool->tilt_x = 0;
@@ -1568,11 +1568,11 @@ tablet_tool_motion(void *data, struct zwp_tablet_tool_v2 *tool,
     int sx = wl_fixed_to_int(x);
     int sy = wl_fixed_to_int(y);
 
-    if (!xwl_seat->focus_window)
+    if (!xwl_seat->tablet_focus_window)
         return;
 
-    dx = xwl_seat->focus_window->window->drawable.x;
-    dy = xwl_seat->focus_window->window->drawable.y;
+    dx = xwl_seat->tablet_focus_window->window->drawable.x;
+    dy = xwl_seat->tablet_focus_window->window->drawable.y;
 
     xwl_tablet_tool->x = dx + sx;
     xwl_tablet_tool->y = dy + sy;
@@ -1585,7 +1585,7 @@ tablet_tool_pressure(void *data, struct zwp_tablet_tool_v2 *tool,
     struct xwl_tablet_tool *xwl_tablet_tool = data;
     struct xwl_seat *xwl_seat = xwl_tablet_tool->seat;
 
-    if (!xwl_seat->focus_window)
+    if (!xwl_seat->tablet_focus_window)
         return;
 
     /* normalized to 65535 already */
@@ -1605,7 +1605,7 @@ tablet_tool_tilt(void *data, struct zwp_tablet_tool_v2 *tool,
     struct xwl_tablet_tool *xwl_tablet_tool = data;
     struct xwl_seat *xwl_seat = xwl_tablet_tool->seat;
 
-    if (!xwl_seat->focus_window)
+    if (!xwl_seat->tablet_focus_window)
         return;
 
     xwl_tablet_tool->tilt_x = wl_fixed_to_double(tilt_x);
@@ -1620,7 +1620,7 @@ tablet_tool_rotation(void *data, struct zwp_tablet_tool_v2 *tool,
     struct xwl_seat *xwl_seat = xwl_tablet_tool->seat;
     double rotation = wl_fixed_to_double(angle);
 
-    if (!xwl_seat->focus_window)
+    if (!xwl_seat->tablet_focus_window)
         return;
 
     /* change origin (buttons facing right [libinput +90 degrees]) and
@@ -1639,7 +1639,7 @@ tablet_tool_slider(void *data, struct zwp_tablet_tool_v2 *tool,
     struct xwl_seat *xwl_seat = xwl_tablet_tool->seat;
     float position = position_raw / 65535.0;
 
-    if (!xwl_seat->focus_window)
+    if (!xwl_seat->tablet_focus_window)
         return;
 
     xwl_tablet_tool->slider = (position * 1799.0f) - 900.0f;
@@ -1652,7 +1652,7 @@ tablet_tool_wheel(void *data, struct zwp_tablet_tool_v2 *tool,
     struct xwl_tablet_tool *xwl_tablet_tool = data;
     struct xwl_seat *xwl_seat = xwl_tablet_tool->seat;
 
-    if (!xwl_seat->focus_window)
+    if (!xwl_seat->tablet_focus_window)
         return;
 
     xwl_tablet_tool->wheel_clicks = clicks;
diff --git a/hw/xwayland/xwayland.c b/hw/xwayland/xwayland.c
index 79deead8d..638022180 100644
--- a/hw/xwayland/xwayland.c
+++ b/hw/xwayland/xwayland.c
@@ -545,6 +545,8 @@ xwl_unrealize_window(WindowPtr window)
     xorg_list_for_each_entry(xwl_seat, &xwl_screen->seat_list, link) {
         if (xwl_seat->focus_window && xwl_seat->focus_window->window == window)
             xwl_seat->focus_window = NULL;
+        if (xwl_seat->tablet_focus_window && xwl_seat->tablet_focus_window->window == window)
+            xwl_seat->tablet_focus_window = NULL;
         if (xwl_seat->last_xwindow == window)
             xwl_seat->last_xwindow = NullWindow;
         if (xwl_seat->cursor_confinement_window &&
diff --git a/hw/xwayland/xwayland.h b/hw/xwayland/xwayland.h
index 3adee82fa..e6eb37bec 100644
--- a/hw/xwayland/xwayland.h
+++ b/hw/xwayland/xwayland.h
@@ -154,6 +154,7 @@ struct xwl_seat {
     struct zwp_tablet_seat_v2 *tablet_seat;
     struct wl_array keys;
     struct xwl_window *focus_window;
+    struct xwl_window *tablet_focus_window;
     uint32_t id;
     uint32_t pointer_enter_serial;
     struct xorg_list link;
-- 
2.14.3