monitor-manager: Move PNP lookup to MetaBackend

It's not really about monitors, even though it is used for monitors.
Lets shrink MetaMonitorManager a bit moving it to the backend.

While at it, stop leaking it too.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2141>

src/backends/meta-backend-private.h

@@ -216,4 +216,7 @@ gboolean meta_backend_is_hw_cursors_inhibited (MetaBackend *backend);
 void meta_backend_update_from_event (MetaBackend  *backend,
                                      ClutterEvent *event);
 
+char * meta_backend_get_vendor_name (MetaBackend *backend,
+                                     const char  *pnp_id);
+
 #endif /* META_BACKEND_PRIVATE_H */

src/backends/meta-backend.c

@@ -167,6 +167,9 @@ struct _MetaBackendPrivate
 #ifdef HAVE_LIBWACOM
   WacomDeviceDatabase *wacom_db;
 #endif
+#ifdef HAVE_GNOME_DESKTOP
+  GnomePnpIds *pnp_ids;
+#endif
 
   ClutterContext *clutter_context;
   ClutterSeat *default_seat;
@@ -236,6 +239,9 @@ meta_backend_dispose (GObject *object)
 #ifdef HAVE_LIBWACOM
   g_clear_pointer (&priv->wacom_db, libwacom_database_destroy);
 #endif
+#ifdef HAVE_GNOME_DESKTOP
+  g_clear_object (&priv->pnp_ids);
+#endif
 
   if (priv->sleep_signal_id)
     {
@@ -1766,3 +1772,29 @@ meta_backend_update_from_event (MetaBackend  *backend,
   update_last_device_from_event (backend, event);
   update_pointer_visibility_from_event (backend, event);
 }
+
+/**
+ * meta_backend_get_vendor_name:
+ * @backend: A #MetaBackend object
+ * @pnp_id: the PNP ID
+ *
+ * Find the full vendor name from the given PNP ID.
+ *
+ * Returns: (transfer full): A string containing the vendor name,
+ *                           or NULL when not found.
+ */
+char *
+meta_backend_get_vendor_name (MetaBackend *backend,
+                              const char  *pnp_id)
+{
+#ifdef HAVE_GNOME_DESKTOP
+  MetaBackendPrivate *priv = meta_backend_get_instance_private (backend);
+
+  if (!priv->pnp_ids)
+    priv->pnp_ids = gnome_pnp_ids_new ();
+
+  return gnome_pnp_ids_get_pnp_id (priv->pnp_ids, pnp_id);
+#else
+  return g_strdup (pnp_id);
+#endif
+}

src/backends/meta-monitor-manager-private.h

@@ -160,10 +160,6 @@ struct _MetaMonitorManager
 
   MetaMonitorConfigManager *config_manager;
 
-#ifdef HAVE_GNOME_DESKTOP
-  GnomePnpIds *pnp_ids;
-#endif
-
   MetaMonitorSwitchConfigType current_switch_config;
 
   MetaPrivacyScreenChangeState privacy_screen_change_state;
@@ -430,9 +426,6 @@ void meta_monitor_manager_clear_crtc (MetaCrtc *crtc);
 
 gboolean meta_monitor_has_aspect_as_size (MetaMonitor *monitor);
 
-char * meta_monitor_manager_get_vendor_name (MetaMonitorManager *manager,
-                                             const char         *vendor);
-
 static inline MetaOutputAssignment *
 meta_find_output_assignment (MetaOutputAssignment **outputs,
                              unsigned int           n_outputs,

src/backends/meta-monitor-manager.c

@@ -3879,30 +3879,6 @@ meta_monitor_manager_get_config_manager (MetaMonitorManager *manager)
   return manager->config_manager;
 }
 
-/**
- * meta_monitor_manager_get_vendor_name:
- * @manager: A #MetaMonitorManager object
- * @vendor:  the PNP ID of the monitor
- *
- * Find the full vendor name from the given monitor PNP ID.
- *
- * Returns: (transfer full): A string containing the vendor name,
- *                           or NULL when not found.
- */
-char *
-meta_monitor_manager_get_vendor_name (MetaMonitorManager *manager,
-                                      const char         *vendor)
-{
-#ifdef HAVE_GNOME_DESKTOP
-  if (!manager->pnp_ids)
-    manager->pnp_ids = gnome_pnp_ids_new ();
-
-  return gnome_pnp_ids_get_pnp_id (manager->pnp_ids, vendor);
-#else
-  return g_strdup (vendor);
-#endif
-}
-
 gboolean
 meta_monitor_manager_get_panel_orientation_managed (MetaMonitorManager *manager)
 {

src/backends/meta-monitor.c

@@ -237,9 +237,9 @@ diagonal_to_str (double d)
 }
 
 static char *
-meta_monitor_make_display_name (MetaMonitor        *monitor,
-                                MetaMonitorManager *monitor_manager)
+meta_monitor_make_display_name (MetaMonitor *monitor)
 {
+  MetaBackend *backend = meta_monitor_get_backend (monitor);
   g_autofree char *inches = NULL;
   g_autofree char *vendor_name = NULL;
   const char *vendor = NULL;
@@ -269,8 +269,7 @@ meta_monitor_make_display_name (MetaMonitor        *monitor,
   vendor = meta_monitor_get_vendor (monitor);
   if (vendor)
     {
-      vendor_name = meta_monitor_manager_get_vendor_name (monitor_manager,
-                                                          vendor);
+      vendor_name = meta_backend_get_vendor_name (backend, vendor);
 
       if (!vendor_name)
         vendor_name = g_strdup (vendor);
@@ -839,8 +838,7 @@ meta_monitor_normal_new (MetaMonitorManager *monitor_manager,
 
   meta_monitor_normal_generate_modes (monitor_normal);
 
-  monitor_priv->display_name = meta_monitor_make_display_name (monitor,
-                                                               monitor_manager);
+  monitor_priv->display_name = meta_monitor_make_display_name (monitor);
 
   return monitor_normal;
 }
@@ -1538,8 +1536,7 @@ meta_monitor_tiled_new (MetaMonitorManager *monitor_manager,
 
   meta_monitor_tiled_generate_modes (monitor_tiled);
 
-  monitor_priv->display_name = meta_monitor_make_display_name (monitor,
-                                                               monitor_manager);
+  monitor_priv->display_name = meta_monitor_make_display_name (monitor);
 
   return monitor_tiled;
 }