void file_chooser_dialog_add_writable_pixbuf_formats (GtkFileChooser *chooser);
GdkPixbufFormat* get_gdk_pixbuf_format_by_extension (gchar *uri);
void file_chooser_dialog_add_writable_pixbuf_formats (GtkFileChooser *chooser);
GdkPixbufFormat* get_gdk_pixbuf_format_by_extension (gchar *uri);