[gtk+] Don't get settings unless we need them

[Matthias Clasen <matthiasc src gnome org>]

commit 590ceded9627da1f25261fc8dc7537bbc0899f23
Author: Hiroyuki Ikezoe <poincare ikezoe net>
Date:   Tue Mar 16 13:01:18 2010 -0400

    Don't get settings unless we need them
    
    Pointed out in bug 613028.

 gtk/gtkstyle.c |   52 +++++++++++++++++++++++++++++++---------------------
 1 files changed, 31 insertions(+), 21 deletions(-)
---
diff --git a/gtk/gtkstyle.c b/gtk/gtkstyle.c
index dd58c9e..f18d76a 100644
--- a/gtk/gtkstyle.c
+++ b/gtk/gtkstyle.c
@@ -2296,6 +2296,36 @@ scale_or_ref (GdkPixbuf *src,
     }
 }
 
+static gboolean
+lookup_icon_size (GtkStyle    *style,
+		  GtkWidget   *widget,
+		  GtkIconSize  size,
+		  gint        *width,
+		  gint        *height)
+{
+  GdkScreen *screen;
+  GtkSettings *settings;
+
+  if (widget && gtk_widget_has_screen (widget))
+    {
+      screen = gtk_widget_get_screen (widget);
+      settings = gtk_settings_get_for_screen (screen);
+    }
+  else if (style && style->colormap)
+    {
+      screen = gdk_colormap_get_screen (style->colormap);
+      settings = gtk_settings_get_for_screen (screen);
+    }
+  else
+    {
+      settings = gtk_settings_get_default ();
+      GTK_NOTE (MULTIHEAD,
+		g_warning ("Using the default screen for gtk_default_render_icon()"));
+    }
+
+  return gtk_icon_size_lookup_for_settings (settings, size, width, height);
+}
+
 static GdkPixbuf *
 gtk_default_render_icon (GtkStyle            *style,
                          const GtkIconSource *source,
@@ -2310,8 +2340,6 @@ gtk_default_render_icon (GtkStyle            *style,
   GdkPixbuf *scaled;
   GdkPixbuf *stated;
   GdkPixbuf *base_pixbuf;
-  GdkScreen *screen;
-  GtkSettings *settings;
 
   /* Oddly, style can be NULL in this function, because
    * GtkIconSet can be used without a style and if so
@@ -2322,25 +2350,7 @@ gtk_default_render_icon (GtkStyle            *style,
 
   g_return_val_if_fail (base_pixbuf != NULL, NULL);
 
-  if (widget && gtk_widget_has_screen (widget))
-    {
-      screen = gtk_widget_get_screen (widget);
-      settings = gtk_settings_get_for_screen (screen);
-    }
-  else if (style && style->colormap)
-    {
-      screen = gdk_colormap_get_screen (style->colormap);
-      settings = gtk_settings_get_for_screen (screen);
-    }
-  else
-    {
-      settings = gtk_settings_get_default ();
-      GTK_NOTE (MULTIHEAD,
-		g_warning ("Using the default screen for gtk_default_render_icon()"));
-    }
-
-  
-  if (size != (GtkIconSize) -1 && !gtk_icon_size_lookup_for_settings (settings, size, &width, &height))
+  if (size != (GtkIconSize) -1 && !lookup_icon_size(style, widget, size, &width, &height))
     {
       g_warning (G_STRLOC ": invalid icon size '%d'", size);
       return NULL;