[mutter] wayland: Use notify::allocation notification to update surface outputs

[Carlos Garnacho <carlosg src gnome org>]

commit cf1edff9ed0c3f20171e75bbbb5d7c0616f1c38d
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sat May 6 22:47:24 2017 +0200

    wayland: Use notify::allocation notification to update surface outputs
    
    Instead of updating the surface outputs on each actor ::paint.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=782344

 src/wayland/meta-wayland-surface.c |   25 ++++++++++++++++---------
 1 files changed, 16 insertions(+), 9 deletions(-)
---
diff --git a/src/wayland/meta-wayland-surface.c b/src/wayland/meta-wayland-surface.c
index 5a0e0ee..10a7aab 100644
--- a/src/wayland/meta-wayland-surface.c
+++ b/src/wayland/meta-wayland-surface.c
@@ -176,6 +176,10 @@ static void
 surface_actor_mapped_notify (MetaSurfaceActorWayland *surface_actor,
                              GParamSpec              *pspec,
                              MetaWaylandSurface      *surface);
+static void
+surface_actor_allocation_notify (MetaSurfaceActorWayland *surface_actor,
+                                 GParamSpec              *pspec,
+                                 MetaWaylandSurface      *surface);
 
 static void
 unset_param_value (GParameter *param)
@@ -414,6 +418,9 @@ meta_wayland_surface_destroy_window (MetaWaylandSurface *surface)
       g_signal_handlers_disconnect_by_func (surface->surface_actor,
                                             surface_actor_mapped_notify,
                                             surface);
+      g_signal_handlers_disconnect_by_func (surface->surface_actor,
+                                            surface_actor_allocation_notify,
+                                            surface);
 
       meta_window_unmanage (surface->window, timestamp);
     }
@@ -1291,16 +1298,17 @@ wl_surface_destructor (struct wl_resource *resource)
 }
 
 static void
-surface_actor_painting (MetaSurfaceActorWayland *surface_actor,
-                        MetaWaylandSurface      *surface)
+surface_actor_mapped_notify (MetaSurfaceActorWayland *surface_actor,
+                             GParamSpec              *pspec,
+                             MetaWaylandSurface      *surface)
 {
   meta_wayland_surface_update_outputs (surface);
 }
 
 static void
-surface_actor_mapped_notify (MetaSurfaceActorWayland *surface_actor,
-                             GParamSpec              *pspec,
-                             MetaWaylandSurface      *surface)
+surface_actor_allocation_notify (MetaSurfaceActorWayland *surface_actor,
+                                 GParamSpec              *pspec,
+                                 MetaWaylandSurface      *surface)
 {
   meta_wayland_surface_update_outputs (surface);
 }
@@ -1324,10 +1332,9 @@ meta_wayland_surface_create (MetaWaylandCompositor *compositor,
   wl_list_init (&surface->pending_frame_callback_list);
 
   g_signal_connect_object (surface->surface_actor,
-                           "painting",
-                           G_CALLBACK (surface_actor_painting),
-                           surface,
-                           0);
+                           "notify::allocation",
+                           G_CALLBACK (surface_actor_allocation_notify),
+                           surface, 0);
   g_signal_connect_object (surface->surface_actor,
                            "notify::mapped",
                            G_CALLBACK (surface_actor_mapped_notify),