Function leptonica_sys::pixVarianceInRectangle

pub unsafe extern "C" fn pixVarianceInRectangle(
    pixs: *mut PIX, 
    box_: *mut BOX, 
    pix_ma: *mut PIX, 
    dpix_msa: *mut DPIX, 
    pvar: *mut l_float32, 
    prvar: *mut l_float32
) -> l_ok