Function cgimage_render_bgra_into_strided 

pub unsafe extern "C" fn cgimage_render_bgra_into_strided(
    image: *const c_void,
    dest: *mut u8,
    dest_capacity: usize,
    dest_bytes_per_row: usize,
) -> usize

Strided BGRA variant. See cgimage_render_bgra_into and cgimage_render_rgba_into_strided.