Function ippiRGBToLab_8u_C3R 

pub unsafe extern "C" fn ippiRGBToLab_8u_C3R(
    pSrc: *const Ipp8u,
    srcStep: c_int,
    pDst: *mut Ipp8u,
    dstStep: c_int,
    roiSize: IppiSize,
) -> IppStatus