Function vips_sys::im_dif_std

pub unsafe extern "C" fn im_dif_std(
    im: *mut VipsImage, 
    xpos: c_int, 
    ypos: c_int, 
    xsize: c_int, 
    ysize: c_int, 
    dx: c_int, 
    dy: c_int, 
    pmean: *mut f64, 
    pstd: *mut f64
) -> c_int