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//! # 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, 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()
}
/// # 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) }
}
}
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;