[gtk/wip/carlosg/tablet-cursors-hidpi] gdk/wayland: Listen to wl_surface events on tablet cursors

[Carlos Garnacho <carlosg src gnome org>]

commit bf4bca715e484a991d506830f196a2939280cae8
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Apr 18 19:31:55 2019 +0200

    gdk/wayland: Listen to wl_surface events on tablet cursors
    
    And update the surface accordingly (eg. scale on hidpi). The mechanism
    that did that for wl_pointer has been made generic so it can be shared
    with tablets too.
    
    Closes: https://gitlab.gnome.org/GNOME/gtk/issues/1675

 gdk/wayland/gdkdevice-wayland.c | 76 +++++++++++++++++++++++++++++++----------
 1 file changed, 58 insertions(+), 18 deletions(-)
---
diff --git a/gdk/wayland/gdkdevice-wayland.c b/gdk/wayland/gdkdevice-wayland.c
index fb3cfcb505..e886c6557a 100644
--- a/gdk/wayland/gdkdevice-wayland.c
+++ b/gdk/wayland/gdkdevice-wayland.c
@@ -310,9 +310,14 @@ struct _GdkWaylandDeviceManagerClass
   GdkDeviceManagerClass parent_class;
 };
 
+static void init_pointer_data (GdkWaylandPointerData *pointer_data,
+                               GdkDisplay            *display_wayland,
+                               GdkDevice             *master);
+
 static void
 pointer_surface_update_scale (GdkDevice *device);
 
+
 static void deliver_key_event (GdkWaylandSeat       *seat,
                                uint32_t              time_,
                                uint32_t              key,
@@ -2971,6 +2976,8 @@ tablet_handle_done (void                 *data,
     g_list_prepend (device_manager->devices, tablet->master);
   g_signal_emit_by_name (device_manager, "device-added", master);
 
+  init_pointer_data (&tablet->pointer_info, display, tablet->master);
+
   tablet->stylus_device = stylus_device;
   device_manager->devices =
     g_list_prepend (device_manager->devices, tablet->stylus_device);
@@ -4446,14 +4453,11 @@ tablet_seat_handle_tablet_added (void                      *data,
                                  struct zwp_tablet_v2      *wp_tablet)
 {
   GdkWaylandSeat *seat = data;
-  GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (seat->display);
   GdkWaylandTabletData *tablet;
 
   tablet = g_new0 (GdkWaylandTabletData, 1);
   tablet->seat = GDK_SEAT (seat);
-  tablet->pointer_info.current_output_scale = 1;
-  tablet->pointer_info.pointer_surface =
-    wl_compositor_create_surface (display_wayland->compositor);
+
   tablet->wp_tablet = wp_tablet;
 
   seat->tablets = g_list_prepend (seat->tablets, tablet);
@@ -4598,16 +4602,28 @@ pointer_surface_enter (void              *data,
                        struct wl_output  *output)
 
 {
-  GdkWaylandSeat *seat = data;
+  GdkDevice *device = data;
+  GdkWaylandSeat *seat = GDK_WAYLAND_SEAT (gdk_device_get_seat (device));
+  GdkWaylandTabletData *tablet;
 
   GDK_NOTE (EVENTS,
             g_message ("pointer surface of seat %p entered output %p",
                        seat, output));
 
-  seat->pointer_info.pointer_surface_outputs =
-    g_slist_append (seat->pointer_info.pointer_surface_outputs, output);
+  tablet = gdk_wayland_device_manager_find_tablet (seat, device);
 
-  pointer_surface_update_scale (seat->master_pointer);
+  if (tablet)
+    {
+      tablet->pointer_info.pointer_surface_outputs =
+        g_slist_append (seat->pointer_info.pointer_surface_outputs, output);
+    }
+  else
+    {
+      seat->pointer_info.pointer_surface_outputs =
+        g_slist_append (seat->pointer_info.pointer_surface_outputs, output);
+    }
+
+  pointer_surface_update_scale (device);
 }
 
 static void
@@ -4615,16 +4631,28 @@ pointer_surface_leave (void              *data,
                        struct wl_surface *wl_surface,
                        struct wl_output  *output)
 {
-  GdkWaylandSeat *seat = data;
+  GdkDevice *device = data;
+  GdkWaylandSeat *seat = GDK_WAYLAND_SEAT (gdk_device_get_seat (device));
+  GdkWaylandTabletData *tablet;
 
   GDK_NOTE (EVENTS,
             g_message ("pointer surface of seat %p left output %p",
                        seat, output));
 
-  seat->pointer_info.pointer_surface_outputs =
-    g_slist_remove (seat->pointer_info.pointer_surface_outputs, output);
+  tablet = gdk_wayland_device_manager_find_tablet (seat, device);
 
-  pointer_surface_update_scale (seat->master_pointer);
+  if (tablet)
+    {
+      tablet->pointer_info.pointer_surface_outputs =
+        g_slist_remove (seat->pointer_info.pointer_surface_outputs, output);
+    }
+  else
+    {
+      seat->pointer_info.pointer_surface_outputs =
+        g_slist_remove (seat->pointer_info.pointer_surface_outputs, output);
+    }
+
+  pointer_surface_update_scale (device);
 }
 
 static const struct wl_surface_listener pointer_surface_listener = {
@@ -4985,6 +5013,23 @@ gdk_wayland_seat_init (GdkWaylandSeat *seat)
 {
 }
 
+static void
+init_pointer_data (GdkWaylandPointerData *pointer_data,
+                   GdkDisplay            *display,
+                   GdkDevice             *master)
+{
+  GdkWaylandDisplay *display_wayland;
+
+  display_wayland = GDK_WAYLAND_DISPLAY (display);
+
+  pointer_data->current_output_scale = 1;
+  pointer_data->pointer_surface =
+    wl_compositor_create_surface (display_wayland->compositor);
+  wl_surface_add_listener (pointer_data->pointer_surface,
+                           &pointer_surface_listener,
+                           master);
+}
+
 void
 _gdk_wayland_device_manager_add_seat (GdkDeviceManager *device_manager,
                                       guint32           id,
@@ -5031,12 +5076,7 @@ _gdk_wayland_device_manager_add_seat (GdkDeviceManager *device_manager,
   wl_data_device_add_listener (seat->data_device,
                                &data_device_listener, seat);
 
-  seat->pointer_info.current_output_scale = 1;
-  seat->pointer_info.pointer_surface =
-    wl_compositor_create_surface (display_wayland->compositor);
-  wl_surface_add_listener (seat->pointer_info.pointer_surface,
-                           &pointer_surface_listener,
-                           seat);
+  init_pointer_data (&seat->pointer_info, display, seat->master_pointer);
 
   init_devices (seat);