Function leptonica_sys::pixNumSignificantGrayColors

pub unsafe extern "C" fn pixNumSignificantGrayColors(
    pixs: *mut PIX,
    darkthresh: l_int32,
    lightthresh: l_int32,
    minfract: l_float32,
    factor: l_int32,
    pncolors: *mut l_int32
) -> l_ok