Function vips_sys::im__wrapscan

pub unsafe extern "C" fn im__wrapscan(
    in_: *mut VipsImage, 
    start: VipsStartFn, 
    scan: im__wrapscan_fn, 
    stop: VipsStopFn, 
    a: *mut c_void, 
    b: *mut c_void
) -> c_int