[mutter] wayland: Make MetaWaylandCompositor a GObject

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit bc5e76c76f7cb427cd00b54f98617409fe290d09
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Aug 23 15:49:17 2018 +0200

    wayland: Make MetaWaylandCompositor a GObject
    
    This makes it possible to use GObject features such as data attachments.
    
    https://gitlab.gnome.org/GNOME/mutter/issues/276

 src/wayland/meta-wayland-private.h |  6 ++++++
 src/wayland/meta-wayland.c         | 33 ++++++++++++++++++++++-----------
 2 files changed, 28 insertions(+), 11 deletions(-)
---
diff --git a/src/wayland/meta-wayland-private.h b/src/wayland/meta-wayland-private.h
index c5db43922..07a71f82b 100644
--- a/src/wayland/meta-wayland-private.h
+++ b/src/wayland/meta-wayland-private.h
@@ -61,6 +61,8 @@ typedef struct
 
 struct _MetaWaylandCompositor
 {
+  GObject parent;
+
   struct wl_display *wayland_display;
   char *display_name;
   GHashTable *outputs;
@@ -74,4 +76,8 @@ struct _MetaWaylandCompositor
   GHashTable *scheduled_surface_associations;
 };
 
+#define META_TYPE_WAYLAND_COMPOSITOR (meta_wayland_compositor_get_type ())
+G_DECLARE_FINAL_TYPE (MetaWaylandCompositor, meta_wayland_compositor,
+                      META, WAYLAND_COMPOSITOR, GObject)
+
 #endif /* META_WAYLAND_PRIVATE_H */
diff --git a/src/wayland/meta-wayland.c b/src/wayland/meta-wayland.c
index 25b49918f..a06d2d7d8 100644
--- a/src/wayland/meta-wayland.c
+++ b/src/wayland/meta-wayland.c
@@ -48,13 +48,17 @@
 #include "wayland/meta-xwayland-private.h"
 #include "wayland/meta-xwayland.h"
 
-static MetaWaylandCompositor _meta_wayland_compositor;
+static MetaWaylandCompositor *_meta_wayland_compositor = NULL;
 static char *_display_name_override;
 
+G_DEFINE_TYPE (MetaWaylandCompositor, meta_wayland_compositor, G_TYPE_OBJECT)
+
 MetaWaylandCompositor *
 meta_wayland_compositor_get_default (void)
 {
-  return &_meta_wayland_compositor;
+  g_assert (_meta_wayland_compositor);
+
+  return _meta_wayland_compositor;
 }
 
 typedef struct
@@ -305,26 +309,33 @@ meta_wayland_log_func (const char *fmt,
 static void
 meta_wayland_compositor_init (MetaWaylandCompositor *compositor)
 {
-  memset (compositor, 0, sizeof (MetaWaylandCompositor));
   wl_list_init (&compositor->frame_callbacks);
 
   compositor->scheduled_surface_associations = g_hash_table_new (NULL, NULL);
-}
-
-void
-meta_wayland_pre_clutter_init (void)
-{
-  MetaWaylandCompositor *compositor = &_meta_wayland_compositor;
-
-  meta_wayland_compositor_init (compositor);
 
   wl_log_set_handler_server (meta_wayland_log_func);
 
   compositor->wayland_display = wl_display_create ();
   if (compositor->wayland_display == NULL)
     g_error ("Failed to create the global wl_display");
+}
+
+static void
+meta_wayland_compositor_class_init (MetaWaylandCompositorClass *klass)
+{
+}
+
+void
+meta_wayland_pre_clutter_init (void)
+{
+  MetaWaylandCompositor *compositor;
 
+  g_assert (!_meta_wayland_compositor);
+
+  compositor = g_object_new (META_TYPE_WAYLAND_COMPOSITOR, NULL);
   clutter_wayland_set_compositor_display (compositor->wayland_display);
+
+  _meta_wayland_compositor = compositor;
 }
 
 static bool