pub unsafe extern "C" fn DispatchImage(
    image: *const Image,
    x_offset: c_long,
    y_offset: c_long,
    columns: c_ulong,
    rows: c_ulong,
    map: *const c_char,
    type_: StorageType,
    pixels: *mut c_void,
    exception: *mut ExceptionInfo
) -> c_uint