Function libnotcurses_sys::ncvisual_from_rgb_packed

pub unsafe extern "C" fn ncvisual_from_rgb_packed(
    rgba: *const c_void, 
    rows: c_int, 
    rowstride: c_int, 
    cols: c_int, 
    alpha: c_int
) -> *mut ncvisual

ncvisual_from_rgba(), but the pixels are 3-byte RGB. A is filled in throughout using ‘alpha’.