Function ncvisual_resize_noninterpolative 

pub unsafe extern "C" fn ncvisual_resize_noninterpolative(
    n: *mut ncvisual,
    rows: c_int,
    cols: c_int,
) -> c_int

Scale the visual to ‘rows’ X ‘columns’ pixels, using non-interpolative (naive) scaling. No new colors will be introduced as a result.