[gtk+/gtk-3-20] Use qdata for debug flags

[Matthias Clasen <matthiasc src gnome org>]

commit 3376093058a7e2e8a75313abf775e94f941fe59c
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Apr 19 23:23:59 2016 -0400

    Use qdata for debug flags
    
    This avoids some overhead.

 gtk/gtkmain.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkmain.c b/gtk/gtkmain.c
index 71693ef..a0a5a35 100644
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -158,6 +158,7 @@ static GSList *main_loops = NULL;      /* stack of currently executing main loop
 static GSList *key_snoopers = NULL;
 
 static guint debug_flags = 0;              /* Global GTK debug flag */
+static GQuark quark_debug_flags = 0;
 
 #ifdef G_ENABLE_DEBUG
 static const GDebugKey gtk_debug_keys[] = {
@@ -730,6 +731,8 @@ do_post_parse_initialization (int    *argc,
 
   _gtk_accel_map_init ();
 
+  quark_debug_flags = g_quark_from_static_string ("gtk-debug-flags");
+
   gtk_initialized = TRUE;
 
   if (gtk_modules_string)
@@ -801,7 +804,7 @@ guint
 gtk_get_display_debug_flags (GdkDisplay *display)
 {
   if (display)
-    return GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (display), "gtk-debug-flags"));
+    return GPOINTER_TO_UINT (g_object_get_qdata (G_OBJECT (display), quark_debug_flags));
   else
     return debug_flags;
 }
@@ -811,7 +814,7 @@ gtk_set_display_debug_flags (GdkDisplay *display,
                              guint       flags)
 {
   if (display)
-    g_object_set_data (G_OBJECT (display), "gtk-debug-flags", GUINT_TO_POINTER (flags));
+    g_object_set_qdata (G_OBJECT (display), quark_debug_flags, GUINT_TO_POINTER (flags));
   else
     debug_flags = flags;
 }