[gtk+] gdkkeys: Avoid instantiating a display manager if none exists

[Colin Walters <walters src gnome org>]

commit d6b4e849578910a354f671d8de09616af7f3ebe1
Author: Colin Walters <walters verbum org>
Date:   Sat Mar 23 13:51:24 2013 -0400

    gdkkeys: Avoid instantiating a display manager if none exists
    
    For introspection scanning which ends up calling class_init() which in
    turn calls into the keybindings code, we can just use the fallback
    keyval conversion code.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=696457

 gdk/gdkdisplaymanager.c        |   13 +++++++++++--
 gdk/gdkdisplaymanagerprivate.h |    3 +++
 gdk/gdkkeys.c                  |    7 +++++--
 3 files changed, 19 insertions(+), 4 deletions(-)
---
diff --git a/gdk/gdkdisplaymanager.c b/gdk/gdkdisplaymanager.c
index e29fa51..b15aeb0 100644
--- a/gdk/gdkdisplaymanager.c
+++ b/gdk/gdkdisplaymanager.c
@@ -267,6 +267,8 @@ gdk_set_allowed_backends (const gchar *backends)
   allowed_backends = g_strdup (backends);
 }
 
+static GdkDisplayManager *manager = NULL;
+
 /**
  * gdk_display_manager_get:
  *
@@ -287,8 +289,6 @@ gdk_set_allowed_backends (const gchar *backends)
 GdkDisplayManager*
 gdk_display_manager_get (void)
 {
-  static GdkDisplayManager *manager = NULL;
-
   if (manager == NULL)
     {
       const gchar *backend_list;
@@ -381,6 +381,15 @@ gdk_display_manager_get (void)
   return manager;
 }
 
+/* Used for cases where we don't actually want to instantiate a
+ * display manager if none exists.  Internal only.
+ */
+GdkDisplayManager *
+_gdk_display_manager_get_nocreate (void)
+{
+  return manager;
+}
+
 /**
  * gdk_display_manager_get_default_display:
  * @manager: a #GdkDisplayManager
diff --git a/gdk/gdkdisplaymanagerprivate.h b/gdk/gdkdisplaymanagerprivate.h
index f915f60..fade4d6 100644
--- a/gdk/gdkdisplaymanagerprivate.h
+++ b/gdk/gdkdisplaymanagerprivate.h
@@ -64,6 +64,9 @@ struct _GdkDisplayManagerClass
                                        GdkDisplay        *display);
 };
 
+GdkDisplayManager *
+_gdk_display_manager_get_nocreate (void);
+
 G_END_DECLS
 
 #endif
diff --git a/gdk/gdkkeys.c b/gdk/gdkkeys.c
index 6b46dbf..9194d7f 100644
--- a/gdk/gdkkeys.c
+++ b/gdk/gdkkeys.c
@@ -203,9 +203,12 @@ gdk_keyval_convert_case (guint symbol,
                          guint *lower,
                          guint *upper)
 {
-  GdkDisplayManager *manager = gdk_display_manager_get ();
+  GdkDisplayManager *manager = _gdk_display_manager_get_nocreate ();
 
-  GDK_DISPLAY_MANAGER_GET_CLASS (manager)->keyval_convert_case (manager, symbol, lower, upper);
+  if (manager)
+    GDK_DISPLAY_MANAGER_GET_CLASS (manager)->keyval_convert_case (manager, symbol, lower, upper);
+  else
+    _gdk_display_manager_real_keyval_convert_case (NULL, symbol, lower, upper);
 }
 
 /**