Function vips_sys::im_measure_area

pub unsafe extern "C" fn im_measure_area(
    im: *mut VipsImage, 
    left: c_int, 
    top: c_int, 
    width: c_int, 
    height: c_int, 
    h: c_int, 
    v: c_int, 
    sel: *mut c_int, 
    nsel: c_int, 
    name: *const c_char
) -> *mut DOUBLEMASK