pub unsafe extern "C" fn gdk_pixbuf_save_to_bufferv(
    pixbuf: *mut GdkPixbuf,
    buffer: *mut *mut u8,
    buffer_size: *mut size_t,
    type_: *const c_char,
    option_keys: *mut *mut c_char,
    option_values: *mut *mut c_char,
    error: *mut *mut GError
) -> gboolean