You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: native_window.rs
    path of file: ./repos/ndk/ndk/src
    
    the code of the file until where you have to start completion: //! Bindings for [`ANativeWindow`]
//!
//! [`ANativeWindow`]: https://developer.android.com/ndk/reference/group/a-native-window#anativewindow

use std::{ffi::c_void, io, mem::MaybeUninit, ptr::NonNull};

use jni_sys::{jobject, JNIEnv};

use super::{hardware_buffer_form
    
    pub fn lines(&mut self) -> Option<impl Iterator<Item = &mut [MaybeUninit<u8>]>> {
        let bpp = self.format().bytes_per_pixel()?;
        let scanline_bytes = bpp * self.stride();
        let width_bytes = bpp * self.width();
        let bytes = self.bytes()?;

        Some(
            bytes
                .chunks_exact_mut(scanline_bytes)
                .map(move |scanline| &mut scanline[..width_bytes]),
        )
    }