//! # fimg
//!
//! Provides fast image operations, such as rotation, flipping, and overlaying.
//!
//! ## Organization
//!
//! Image types:
//!
//! - [`Image`]: the main image type.
//! - [`DynImage`]: This is the image type you use when, say, loading a png. You should immediately convert this into a
//! - [`ImageCloner`]: This is... a [`Image`], but about to be cloned. It just allows some simple out-of-place optimizations, that `.clone().op()` dont  allow. (produce with [`Image::cloner`])
//! - [`uninit::Image`]: A uninitialized image. Used for performance optimization.
//!
//! ### Operations
//!
//! Affine:
//! - [`Image::rot_90`]
//! - [`Image::rot_180`]
//! - [`Image::rot_270`]
//! - [`Image::flip_h`]
//! - [`Image::flip_v`]
//!
//! Drawing:
//! - [`Image::box`], [`Image::filled_box`], [`Image::stroked_box`]
//! - [`Image::circle`], [`Image::border_circle`]
//! - [`Image::line`], [`Image::thick_line`]
//! - [`Image::points`]
//! - [`Image::quad`]
//! - [`Image::poly`], [`Image::border_poly`]
//! - [`Image::tri`]
//! - [`Image::text`]
//!
//! Scaling: [`Image::scale`]
//!
//! Misc image ops:
//! - [`Image::repeated`]
//! - [`Image::overlay`](Overlay), [`Image::overlay_at`](OverlayAt), [`Image::overlay_blended`](BlendingOverlay)
//! - [`Image::blur`]
//! - [`Image::crop`]
//!
//! ## feature flags
//!
//! - `scale`: enables the [`scale`] module.
//! - `save`: enables [`Image::save`], via the [`png`](https://crates.io/crates/png) crate.
//! - `text`: enables [`Image::text`], via the [`fontdue`](https://crates.io/crates/fontdue) crate.
//! - `blur`: enables [`Image::blur`], via the [`stackblur`](https://crates.io/crates/stackblur-iter) crate.
//! - `real-show`: [`Image::show`], if the `save` feature is enabled, will, by default, simply open the appropriate image viewing program.
//! if, for some reason, this is inadequate/you dont have a good image viewer, enable the `real-show` feature to make [`Image::show`] open up a window of its own.
//! without the `real-show` feature, [`Image::show`] will save itself to your temp directory, which you may not want.
//! - `term`: [`term::print`]. this enables printing images directly to the terminal, if you don't want to open a window or something. supports `{iterm2, kitty, sixel, fallback}` graphics.
//! - `default`: \[`save`, `scale`\].
#![cfg_attr(all(feature = "term", windows), windows_subsystem = "console")]
#![feature(
    maybe_uninit_write_slice,
    hint_assert_unchecked,
    slice_swap_unchecked,
    generic_const_exprs,
    iter_array_chunks,
    core_intrinsics,
    slice_as_chunks,
    slice_flatten,
    rustc_private,
    portable_simd,
    array_windows,
    doc_auto_cfg,
    const_option,
    array_chunks,
    let_chains,
    try_blocks,
    test
)]
#![warn(
    clippy::undocumented_unsafe_blocks,
    clippy::missing_const_for_fn,
    clippy::missing_safety_doc,
    clippy::suboptimal_flops,
    unsafe_op_in_unsafe_fn,
    clippy::dbg_macro,
    clippy::use_self,
    missing_docs
)]
#![allow(
    clippy::zero_prefixed_literal,
    mixed_script_confusables,
    incomplete_features,
    confusable_idents,
    internal_features
)]
use std::{hint::assert_unchecked, intrinsics::transmute_unchecked, num::NonZeroU32, ops::Range};

mod affine;
#[cfg(feature = "blur")]
mod blur;
pub use sub::{Cropper, SubImage};
pub mod builder;
#[doc(hidden)]
pub mod cloner;
mod convert;
mod drawing;
mod r#dyn;
pub(crate) mod math;
mod overlay;
mod pack;
mod span;
mod sub;
pub mod uninit;
#[cfg(feature = "wgpu-convert")]
mod wgpu_convert;
pub use pack::Pack;
pub mod pixels;
#[cfg(feature = "scale")]
pub mod scale;
#[cfg(any(feature = "save", feature = "real-show"))]
mod show;
#[cfg(feature = "term")]
pub mod term;
pub use cloner::ImageCloner;
pub use overlay::{BlendingOverlay, ClonerOverlay, ClonerOverlayAt, Overlay, OverlayAt};
pub use r#dyn::DynImage;

trait CopyWithinUnchecked {
    /// # Safety
    ///
    /// panicless version of [`[T]::copy_within`](`slice::copy_within`), where the slices cant overlap. this uses `memcpy`.
    /// your slices must be in bounds.
    /// this isnt a public function, so im not going to say exactly what "in bounds" means.
    unsafe fn copy_within_unchecked(&mut self, src: Range<usize>, dest: usize);
}

impl<T> CopyWithinUnchecked for [T] {
    unsafe fn copy_within_unchecked(&mut self, src: Range<usize>, dest: usize) {
        let std::ops::Range { start, end } = src;
        debug_assert!(dest <= self.len() - end - start, "dest is out of bounds");
        #[allow(clippy::multiple_unsafe_ops_per_block)]
        // SAFETY: the caller better be good
        unsafe {
            let ptr = self.as_mut_ptr();
            std::ptr::copy_nonoverlapping(ptr.add(start), ptr.add(dest), end - start)
        };
    }
}

trait At {
    fn at<const C: usize>(self, x: u32, y: u32) -> usize;
}

impl At for (u32, u32) {
    fn at<const C: usize>(self, x: u32, y: u32) -> usize {
        debug_assert!(x < self.0, "x out of bounds");
        debug_assert!(y < self.1, "y out of bounds");
        #[allow(clippy::multiple_unsafe_ops_per_block)]
        // SAFETY: me when uncheck math: 😧 (FIXME)
        let index = unsafe {
            // y * w + x
            let tmp = (y as usize).unchecked_mul(self.0 as usize);
            tmp.unchecked_add(x as usize)
        };
        // SAFETY: 🧐 is unsound? 😖
        unsafe { index.unchecked_mul(C) }
    }
}

impl Image<&[u8], 3> {
    /// Tile self till it fills a new image of size x, y
    /// # Safety
    ///
    /// UB if self's width is not a multiple of x, or self's height is not a multiple of y
    /// ```
    /// # use fimg::Image;
    /// let x: Image<&[u8], 3> = Image::build(8, 8).buf(include_bytes!("../benches/3_8x8.imgbuf"));
    /// let tiled = unsafe { x.repeated(48, 48) }; // repeat 6 times
    /// # assert_eq!(tiled.buffer(), 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    /// ```
    #[must_use = "function does not modify the original image"]
    pub unsafe fn repeated(&self, out_width: u32, out_height: u32) -> Image<Vec<u8>, 3> {
        let mut img = uninit::Image::new(
            out_width.try_into().unwrap(),
            out_height.try_into().unwrap(),
        );
        debug_assert!(out_width % self.width() == 0);
        debug_assert!(out_height % self.height() == 0);
        for y in 0..self.height() {
            // SAFETY: get one row of pixels
            let from = unsafe {
                self.buffer
                    .get_unchecked(self.at(0, y)..self.at(0, y) + (self.width() as usize * 3))
            };
            debug_assert_eq!(from.len(), self.width() as usize * 3);
            let first = (0, y)..(self.width(), y);
            // SAFETY: copy it in
            unsafe { img.write(from, first.clone()) };

            for x in 1..(out_width / self.width()) {
                let section = img.at(x * self.width(), y);
                // SAFETY: copy each row of the image one by one
                unsafe { img.copy_within(first.clone(), section) };
            }
        }

        let first_row = 0..img.at(0, self.height());
        for y in 1..(out_height / self.height()) {
            let this_row = img.at(0, y * self.height());
            // SAFETY: copy entire blocks of image at a time
            unsafe { img.copy_within(first_row.clone(), this_row) };
        }
        // SAFETY: we init
        unsafe { img.assume_init() }
    }
}

/// A image with a variable number of channels, and a nonzero size.
#[derive(Debug, PartialEq, Eq)]
#[repr(C)]
pub struct Image<T, const CHANNELS: usize> {
    /// column order 2d slice/vec
    buffer: T,
    /// image horizontal size
    width: NonZeroU32,
    /// image vertical size
    height: NonZeroU32,
}

impl<T: Clone, const CHANNELS: usize> Clone for Image<T, CHANNELS> {
    /// Returns a duplicate of this image.
    /// ```
    /// # use fimg::Image;
    /// # let i = Image::<Vec<_>, 1>::alloc(5,5);
    /// let new_i = i.clone();
    /// ```
    /// If you find yourself in the pattern of
    /// ```
    /// # use fimg::Image;
    /// # let i = Image::<Vec<_>, 1>::alloc(5,5);
    /// let mut i = i.clone();
    /// unsafe { i.rot_90() };
    /// ```
    /// STOP!
    ///
    /// Instead use
    /// ```
    /// # use fimg::Image;
    /// # let i = Image::<Vec<_>, 1>::alloc(5,5);
    /// let i = unsafe { i.cloner().rot_90() };
    /// ```
    fn clone(&self) -> Self {
        Self {
            buffer: self.buffer.clone(),
            width: self.width,
            height: self.height,
        }
    }
}

impl<T, const CHANNELS: usize> Image<T, CHANNELS> {
    #[inline]
    /// get the height as a [`u32`]
    pub const fn height(&self) -> u32 {
        self.height.get()
    }

    #[inline]
    /// get the width as a [`u32`]
    pub const fn width(&self) -> u32 {
        self.width.get()
    }

    #[inline]
    /// create a new image
    ///
    /// # Safety
    ///
    /// does not check that buffer.len() == w * h * C
    ///
    /// using this with invalid values may result in future UB
    pub const unsafe fn new(width: NonZeroU32, height: NonZeroU32, buffer: T) -> Self {
        Self {
            buffer,
            width,
            height,
        }
    }

    /// consumes the image, returning the image buffer
    pub fn take_buffer(self) -> T {
        self.buffer
    }

    /// returns a immutable reference to the backing buffer
    pub const fn buffer(&self) -> &T {
        &self.buffer
    }

    /// returns a mutable(!) reference to the backing buffer
    ///
    /// # Safety
    ///
    /// please do not change buffer size.
    pub unsafe fn buffer_mut(&mut self) -> &mut T {
        &mut self.buffer
    }

    /// # Safety
    ///
    /// the output index is not guaranteed to be in bounds
    #[inline]
    fn at(&self, x: u32, y: u32) -> usize {
        (self.width(), self.height()).at::<CHANNELS>(x, y)
    }

    /// # Safety
    /// keep the buffer size the same
    unsafe fn map<U, const N: usize, F: FnOnce(&T) -> U>(&self, f: F) -> Image<U, N> {
        // SAFETY: we dont change anything, why check
        unsafe { Image::new(self.width, self.height, f(self.buffer())) }
    }

    unsafe fn mapped<U, const N: usize, F: FnOnce(T) -> U>(self, f: F) -> Image<U, N> {
        // SAFETY: we dont change anything, why check
        unsafe { Image::new(self.width, self.height, f(self.buffer)) }
    }

    /// # Safety
    /// buffer size must be the same.
    unsafe fn map_into<U: From<T>, const N: usize>(self) -> Image<U, N> {
        unsafe { self.mapped(Into::into) }
    }
}

impl<const CHANNELS: usize, T: Clone> Image<&[T], CHANNELS> {
    /// Allocate a new `Image<Vec<T>>` from this imageref.
    pub fn to_owned(&self) -> Image<Vec<T>, CHANNELS> {
        // SAFETY: size not changed
        unsafe { self.map(|b| b.to_vec()) }
    }
}

impl<const CHANNELS: usize, T: Clone> Image<&mut [T], CHANNELS> {
    /// Allocate a new `Image<Vec<T>>` from this mutable imageref.
    pub fn to_owned(&self) -> Image<Vec<T>, CHANNELS> {
        // SAFETY: size not changed
        unsafe { self.map(|b| b.to_vec()) }
    }
}

impl<const CHANNELS: usize> Copy for Image<&[u8], CHANNELS> {}

impl<const CHANNELS: usize> Image<&[u8], CHANNELS> {
    #[inline]
    #[must_use]
    /// Copy this ref image
    pub const fn copy(&self) -> Self {
        Self {
            width: self.width,
            height: self.height,
            buffer: self.buffer,
        }
    }

    /// Create a new immutable image of width x, y.
    ///
    /// # Panics
    ///
    /// if width || height == 0
    ///
    /// ```
    /// # use fimg::Image;
    /// let img = Image::make::<5, 5>();
    /// # let img: Image<_, 4> = img;
    /// ```
    pub const fn make<'a, const WIDTH: u32, const HEIGHT: u32>() -> Image<&'a [u8], CHANNELS>
    where
        [(); CHANNELS * WIDTH as usize * HEIGHT as usize]:,
    {
        Image {
            width: NonZeroU32::new(WIDTH).expect("passed zero width to builder"),
            height: NonZeroU32::new(HEIGHT).expect("passed zero height to builder"),
            buffer: &[0; CHANNELS * WIDTH as usize * HEIGHT as usize],
        }
    }
}

impl<const CHANNELS: usize, const N: usize> Image<[u8; N], CHANNELS> {
    /// Box this array image.
    pub fn boxed(self) -> Image<Box<[u8]>, CHANNELS> {
        // SAFETY: size not changed
        unsafe { self.map_into() }
    }
}

impl<const CHANNELS: usize> Image<&[u8], CHANNELS> {
    /// Box this image.
    pub fn boxed(self) -> Image<Box<[u8]>, CHANNELS> {
        // SAFETY: size not changed
        unsafe { self.map_into() }
    }
}

impl<const CHANNELS: usize> Image<Vec<u8>, CHANNELS> {
    /// Box this owned image.
    pub fn boxed(self) -> Image<Box<[u8]>, CHANNELS> {
        // SAFETY: ctor
        unsafe { self.map_into() }
    }
}

impl<const CHANNELS: usize> Image<Box<[u8]>, CHANNELS> {
    /// Unbox this vec image.
    pub fn unbox(self) -> Image<Vec<u8>, CHANNELS> {
        // SAFETY: ctor
        unsafe { self.map_into() }
    }
}

#[macro_export]
/// Create a <code>[Image]<[[u8]; N], C></code> with ease. If your looking for a <code>[Image]<&'static [[u8]]></code>, try [`Image::make`].
///
/// ```
/// let mut i = fimg::make!(4 channels 128 x 128);
/// ```
///
/// Implementation note:
/// This is doable with a const generic fn, but it returns a `fimg::Image<[u8; fimg::::{impl#7}::array::{constant#1}], _>` which means you cant actually type it, so its useless.
macro_rules! make {
    ($channels:literal channels $w:literal x $h: literal) => {
        unsafe {
            $crate::Image::<_, $channels>::new(
                match ::core::num::NonZeroU32::new($w) {
                    ::core::option::Option::Some(n) => n,
                    ::core::option::Option::None => panic!("width is 0"),
                },
                match ::core::num::NonZeroU32::new($h) {
                    ::core::option::Option::Some(n) => n,
                    ::core::option::Option::None => panic!("height is 0"),
                },
                [0_u8; $channels * $w * $h],
            )
        }
    };
}

impl<T, const CHANNELS: usize> Image<T, CHANNELS> {
    /// The size of the underlying buffer.
    #[allow(clippy::len_without_is_empty)]
    pub fn len<U>(&self) -> usize
    where
        T: AsRef<[U]>,
    {
        self.buffer().as_ref().len()
    }

    /// Transforms the N
    ///
    /// # Safety
    ///
    /// i think you can see why this is a problem.
    ///
    /// # WHY???
    ///
    /// sometimes rust is silly with generics
    unsafe fn trans<const N: usize>(self) -> Image<T, N> {
        unsafe { transmute_unchecked(self) }
    }
    /// # Safety
    ///
    /// the output index is not guaranteed to be in bounds
    #[inline]
    fn slice<U>(&self, x: u32, y: u32) -> Range<usize>
    where
        T: AsRef<[U]>,
    {
        let index = self.at(x, y);
        debug_assert!(self.len() > index);
        // SAFETY: as long as the buffer isnt wrong, this is 😄
        index..unsafe { index.unchecked_add(CHANNELS) }
    }

    #[inline]
    /// Returns a iterator over every pixel
    pub fn chunked<'a, U: 'a>(&'a self) -> impl DoubleEndedIterator<Item = &'a [U; CHANNELS]>
    where
        T: AsRef<[U]>,
    {
        // SAFETY: 0 sized images illegal
        unsafe { assert_unchecked(self.len() >= CHANNELS) };
        // SAFETY: no half pixels!
        unsafe { assert_unchecked(self.len() % CHANNELS == 0) };
        self.buffer().as_ref().array_chunks::<CHANNELS>()
    }

    #[inline]
    /// Flatten the chunks of this image into a slice of slices.
    pub fn flatten<U>(&self) -> &[[U; CHANNELS]]
    where
        T: AsRef<[U]>,
    {
        // SAFETY: buffer cannot have half pixels
        unsafe { self.buffer().as_ref().as_chunks_unchecked::<CHANNELS>() }
    }

    /// Create a mutref to this image
    pub fn as_mut<U>(&mut self) -> Image<&mut [U], CHANNELS>
    where
        T: AsMut<[U]>,
    {
        // SAFETY: construction went okay
        unsafe { Image::new(self.width, self.height, self.buffer.as_mut()) }
    }

    /// Reference this image.
    pub fn as_ref<U>(&self) -> Image<&[U], CHANNELS>
    where
        T: AsRef<[U]>,
    {
        // SAFETY: we got constructed okay, parameters must be valid
        unsafe { Image::new(self.width, self.height, self.buffer().as_ref()) }
    }

    /// Return a pixel at (x, y).
    /// # Safety
    ///
    /// - UB if x, y is out of bounds
    /// - UB if buffer is too small
    #[inline]
    pub unsafe fn pixel<U: Copy>(&self, x: u32, y: u32) -> [U; CHANNELS]
    where
        T: AsRef<[U]>,
    {
        // SAFETY: x and y in bounds, slice is okay
        let ptr = unsafe {
            self.buffer()
                .as_ref()
                .get_unchecked(self.slice(x, y))
                .as_ptr()
                .cast()
        };
        // SAFETY: slice always returns a length of `CHANNELS`, so we `cast()` it for convenience.
        unsafe { *ptr }
    }

    /// Return a mutable reference to a pixel at (x, y).
    /// # Safety
    ///
    /// - UB if x, y is out of bounds
    /// - UB if buffer is too small
    #[inline]
    pub unsafe fn pixel_mut<U: Copy>(&mut self, x: u32, y: u32) -> &mut [U]
    where
        T: AsMut<[U]> + AsRef<[U]>,
    {
        // SAFETY: we have been told x, y is in bounds.
        let idx = self.slice(x, y);
        // SAFETY: slice should always return a valid index
        unsafe { self.buffer.as_mut().get_unchecked_mut(idx) }
    }

    /// iterator over columns
    /// returned iterator returns a iterator for each column
    ///
    /// ```text
    /// ┌ ┐┌ ┐┌ ┐
    /// │1││2││3│
    /// │4││5││6│
    /// │7││8││9│
    /// └ ┘└ ┘└ ┘
    /// ```
    ///
    /// ```
    /// # use fimg::Image;
    /// let img: Image<&[u8],1> = Image::build(2, 3).buf(&[
    ///    1, 5,
    ///    2, 4,
    ///    7, 9
    /// ]);
    /// assert_eq!(
    ///     img.cols().map(|x| x.collect::<Vec<_>>()).collect::<Vec<_>>(),
    ///     [[[1], [2], [7]], [[5], [4], [9]]]
    /// );
    /// ```
    #[must_use = "iterators are lazy and do nothing unless consumed"]
    pub fn cols<U: Copy>(
        &self,
    ) -> impl DoubleEndedIterator
           + ExactSizeIterator<
        Item = impl ExactSizeIterator + DoubleEndedIterator<Item = [U; CHANNELS]> + '_,
    >
    where
        T: AsRef<[U]>,
    {
        (0..self.width()).map(move |x| (0..self.height()).map(move |y| unsafe { self.pixel(x, y) }))
    }

    /// iterator over rows
    /// returns a iterator over each row
    /// ```text
    /// [ 1 2 3 ]
    /// [ 4 5 6 ]
    /// [ 7 8 9 ]
    /// ```
    ///
    /// ```
    /// # use fimg::Image;
    /// let img: Image<&[u8],1> = Image::build(2, 3).buf(&[
    ///     1, 5,
    ///     2, 4,
    ///     7, 9
    /// ]);
    /// assert_eq!(
    ///     img.rows().collect::<Vec<_>>(),
    ///     [[[1], [5]], [[2], [4]], [[7], [9]]]
    /// );
    /// ```
    #[must_use = "iterators are lazy and do nothing unless consumed"]
    pub fn rows<'a, U: 'a>(
        &'a self,
    ) -> impl ExactSizeIterator + DoubleEndedIterator<Item = &'a [[U; CHANNELS]]>
    where
        T: AsRef<[U]>,
    {
        self.flatten().chunks_exact(self.width() as usize)
    }
}

impl<T: AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
    /// Bytes of this image.
    pub fn bytes(&self) -> &[u8] {
        self.buffer.as_ref()
    }

    /// Procure a [`ImageCloner`].
    #[must_use = "function does not modify the original image"]
    pub fn cloner(&self) -> ImageCloner<'_, CHANNELS> {
        ImageCloner::from(self.as_ref())
    }
}

impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
    #[inline]
    /// Returns a iterator over every pixel, mutably
    pub fn chunked_mut(&mut self) -> impl Iterator<Item = &mut [u8; CHANNELS]> {
        // SAFETY: 0 sized images are not allowed
        unsafe { assert_unchecked(self.len() >= CHANNELS) };
        // SAFETY: buffer cannot have half pixels
        unsafe { assert_unchecked(self.len() % CHANNELS == 0) };
        self.buffer.as_mut().array_chunks_mut::<CHANNELS>()
    }

    #[inline]
    /// Flatten the chunks of this image into a mutable slice of slices.
    pub fn flatten_mut(&mut self) -> &mut [[u8; CHANNELS]] {
        // SAFETY: buffer cannot have half pixels
        unsafe { self.buffer.as_mut().as_chunks_unchecked_mut::<CHANNELS>() }
    }

    /// Set the pixel at x, y
    ///
    /// # Safety
    ///
    /// UB if x, y is out of bounds.
    #[inline]
    pub unsafe fn set_pixel(&mut self, x: u32, y: u32, px: [u8; CHANNELS]) {
        // SAFETY: Caller says that x, y is in bounds
        let out = unsafe { self.pixel_mut(x, y) };
        // SAFETY: px must be CHANNELS long
        unsafe { std::ptr::copy_nonoverlapping(px.as_ptr(), out.as_mut_ptr(), CHANNELS) };
    }
}

impl<const CHANNELS: usize> Image<&mut [u8], CHANNELS> {
    /// Copy this ref image
    pub fn copy(&mut self) -> Image<&mut [u8], CHANNELS> {
        #[allow(clippy::undocumented_unsafe_blocks)]
        unsafe {
            Image::new(self.width, self.height, self.buffer)
        }
    }
}

impl<const CHANNELS: usize> Image<Vec<u8>, CHANNELS> {
    /// Allocates a new image. If `width` and `height` are constant, try using [`make`].
    ///
    /// # Panics
    ///
    /// if width || height == 0
    #[must_use]
    pub fn alloc(width: u32, height: u32) -> Self {
        Self {
            width: width.try_into().unwrap(),
            height: height.try_into().unwrap(),
            buffer: vec![0; CHANNELS * width as usize * height as usize],
        }
    }

    /// Consumes and leaks this image, returning a reference to the image.
    #[must_use = "not using the returned reference is a memory leak"]
    pub fn leak(self) -> Image<&'static mut [u8], CHANNELS> {
        // SAFETY: size unchanged
        unsafe { self.mapped(Vec::leak) }
    }
}

impl<const CHANNELS: usize, T: ?Sized> Image<Box<T>, CHANNELS> {
    /// Consumes and leaks this image, returning a reference to the image.
    #[must_use = "not using the returned reference is a memory leak"]
    pub fn leak(self) -> Image<&'static mut T, CHANNELS> {
        // SAFETY: size unchanged
        unsafe { self.mapped(Box::leak) }
    }
}

#[cfg(feature = "save")]
/// Write a png image.
pub trait WritePng {
    /// Write this png image.
    fn write(&self, f: &mut impl std::io::Write) -> std::io::Result<()>;
}

/// Read png.
#[cfg(feature = "save")]
pub trait ReadPng
where
    Self: Sized,
{
    /// Read a png into an image.
    fn read(f: &mut impl std::io::Read) -> std::io::Result<Self>;
}

/// helper macro for defining the save() method.
macro_rules! save {
    ($channels:literal == $clr:ident ($clrhuman:literal)) => {
        #[cfg(feature = "save")]
        impl<T: AsRef<[u8]>> WritePng for Image<T, $channels> {
            #[doc = "Save this "]
            #[doc = $clrhuman]
            #[doc = " image."]
            fn write(&self, f: &mut impl std::io::Write) -> std::io::Result<()> {
                let mut enc = png::Encoder::new(f, self.width(), self.height());
                enc.set_color(png::ColorType::$clr);
                enc.set_depth(png::BitDepth::Eight);
                enc.set_source_gamma(png::ScaledFloat::new(1.0 / 2.2));
                enc.set_source_chromaticities(png::SourceChromaticities::new(
                    (0.31270, 0.32900),
                    (0.64000, 0.33000),
                    (0.30000, 0.60000),
                    (0.15000, 0.06000),
                ));
                let mut writer = enc.write_header()?;
                writer.write_image_data(self.bytes())?;
                Ok(())
            }
        }
        impl<T: AsRef<[u8]>> Image<T, $channels> {
            #[cfg(feature = "save")]
            #[doc = "Save this "]
            #[doc = $clrhuman]
            #[doc = " image."]
            pub fn save(&self, f: impl AsRef<std::path::Path>) {
                self.write(&mut std::io::BufWriter::new(
                    std::fs::File::create(f).unwrap(),
                ))
                .unwrap();
            }
        }
    };
}

macro_rules! read {
    ($n:literal) => {
        #[cfg(feature = "save")]
        impl ReadPng for Image<Box<[u8]>, $n> {
            /// Open a PNG image
            fn read(f: &mut impl std::io::Read) -> std::io::Result<Self> {
                use png::Transformations as T;
                let mut dec = png::Decoder::new(f);
                match $n {
                    1 | 3 => dec.set_transformations(T::STRIP_16 | T::EXPAND),
                    2 | 4 => dec.set_transformations(T::STRIP_16 | T::ALPHA), // alpha implies expand
                    _ => (),
                }
                let mut reader = dec.read_info()?;
                let mut buf = vec![0; reader.output_buffer_size()].into_boxed_slice();
                let info = reader.next_frame(&mut buf)?;
                use png::ColorType::*;
                macro_rules! n {
                    ($x:literal) => {
                        Image::<_, $x>::build(info.width, info.height)
                            .buf(buf)
                            .into()
                    };
                }
                Ok(match info.color_type {
                    Indexed => unreachable!(), // see EXPAND
                    Grayscale => n![1],
                    GrayscaleAlpha => n![2],
                    Rgb => n![3],
                    Rgba => n![4],
                })
            }
        }
    };
}
impl<const CHANNELS: usize> Image<Vec<u8>, CHANNELS>
where
    [(); { (CHANNELS <= 4) as usize } - 1]:,
{
    #[cfg(feature = "save")]
    /// Open a PNG image
    pub fn open(f: impl AsRef<std::path::Path>) -> Self {
        let p = std::fs::File::open(f).unwrap();
        let r = &mut std::io::BufReader::new(p);
        use core::intrinsics::transmute_unchecked as t;
        // SAFETY: ... this is idiotic.
        unsafe {
            match CHANNELS {
                1 => t(Image::<Box<_>, 1>::read(r).unwrap().unbox()),
                2 => t(Image::<Box<_>, 2>::read(r).unwrap().unbox()),
                3 => t(Image::<Box<_>, 3>::read(r).unwrap().unbox()),
                4 => t(Image::<Box<_>, 4>::read(r).unwrap().unbox()),
                _ => unreachable!(),
            }
        }
    }
}
read!(1);
read!(2);
read!(3);
read!(4);

save!(3 == Rgb("RGB"));
save!(4 == Rgba("RGBA"));
save!(2 == GrayscaleAlpha("YA"));
save!(1 == Grayscale("Y"));

#[cfg(test)]
macro_rules! img {
    [[$($v:literal),+] [$($v2:literal),+]] => {
        Image::<Vec<u8>, 1>::build(2,2).buf(vec![$($v,)+ $($v2,)+])
    }
}
#[cfg(test)]
use img;