+gint get_num_monitors (GtkWindow * window);
+
+gdouble get_screen_dpi (GtkWindow * window);
+
+void file_chooser_dialog_add_writable_pixbuf_formats (GtkFileChooser *chooser);
+GdkPixbufFormat* get_gdk_pixbuf_format_by_extension (gchar *uri);
+
+char* escape_uri_for_display (const char *uri);