mirror of
https://github.com/bend-n/fimg.git
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484 lines
43 KiB
Rust
484 lines
43 KiB
Rust
//! # fimg
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//!
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//! Provides fast image operations, such as rotation, flipping, and overlaying.
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#![feature(
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slice_swap_unchecked,
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stmt_expr_attributes,
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generic_const_exprs,
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vec_into_raw_parts,
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slice_as_chunks,
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unchecked_math,
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slice_flatten,
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portable_simd,
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array_windows,
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const_option,
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array_chunks,
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test
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)]
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#![warn(
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clippy::missing_docs_in_private_items,
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clippy::multiple_unsafe_ops_per_block,
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clippy::undocumented_unsafe_blocks,
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clippy::missing_const_for_fn,
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clippy::missing_safety_doc,
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clippy::suboptimal_flops,
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unsafe_op_in_unsafe_fn,
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clippy::dbg_macro,
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clippy::use_self,
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missing_docs
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)]
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#![allow(clippy::zero_prefixed_literal, incomplete_features)]
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use std::{num::NonZeroU32, slice::SliceIndex};
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mod affine;
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pub mod builder;
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pub mod cloner;
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mod drawing;
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mod overlay;
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pub mod scale;
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use cloner::ImageCloner;
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pub use overlay::{ClonerOverlay, ClonerOverlayAt, Overlay, OverlayAt};
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/// like assert!(), but causes undefined behaviour at runtime when the condition is not met.
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///
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/// # Safety
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///
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/// UB if condition is false.
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macro_rules! assert_unchecked {
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($cond:expr) => {{
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if !$cond {
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#[cfg(debug_assertions)]
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let _ = ::core::ptr::NonNull::<()>::dangling().as_ref(); // force unsafe wrapping block
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#[cfg(debug_assertions)]
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panic!("assertion failed: {} returned false", stringify!($cond));
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#[cfg(not(debug_assertions))]
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std::hint::unreachable_unchecked()
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}
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}};
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}
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use assert_unchecked;
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impl Image<&[u8], 3> {
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/// Tile self till it fills a new image of size x, y
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/// # Safety
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///
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/// UB if self's width is not a multiple of x, or self's height is not a multiple of y
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/// ```
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/// # use fimg::Image;
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/// let x: Image<&[u8], 3> = Image::build(8, 8).buf(include_bytes!("../benches/3_8x8.imgbuf"));
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/// let tiled = unsafe { x.repeated(48, 48) }; // repeat 6 times
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/// # 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 = Image::<_, 3>::alloc(out_width, out_height);
|
|
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 = img.at(0, y)..img.at(self.width(), y);
|
|
// SAFETY: put it in the output
|
|
let to = unsafe { img.buffer.get_unchecked_mut(first.clone()) };
|
|
// copy it in
|
|
to.copy_from_slice(from);
|
|
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) };
|
|
}
|
|
img
|
|
}
|
|
}
|
|
|
|
/// A image with a variable number of channels, and a nonzero size.
|
|
#[derive(Debug, PartialEq, Eq)]
|
|
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 fn height(&self) -> u32 {
|
|
self.height.into()
|
|
}
|
|
|
|
#[inline]
|
|
/// get the width as a [`u32`]
|
|
pub fn width(&self) -> u32 {
|
|
self.width.into()
|
|
}
|
|
|
|
#[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
|
|
}
|
|
}
|
|
|
|
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: we have been constructed already, so must be valid
|
|
unsafe { Image::new(self.width, self.height, self.buffer.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: we have been constructed already, so must be valid
|
|
unsafe { Image::new(self.width, self.height, self.buffer.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]: Sized,
|
|
{
|
|
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<T: std::ops::Deref<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
|
|
/// # Safety
|
|
///
|
|
/// the output index is not guranteed to be in bounds
|
|
#[inline]
|
|
fn slice(&self, x: u32, y: u32) -> impl SliceIndex<[u8], Output = [u8]> {
|
|
let index = self.at(x, y);
|
|
// SAFETY: as long as the buffer isnt wrong, this is 😄
|
|
index..unsafe { index.unchecked_add(CHANNELS) }
|
|
}
|
|
|
|
/// # Safety
|
|
///
|
|
/// the output index is not guranteed to be in bounds
|
|
#[inline]
|
|
fn at(&self, x: u32, y: u32) -> usize {
|
|
debug_assert!(x < self.width(), "x out of bounds");
|
|
debug_assert!(y < self.height(), "y out of bounds");
|
|
#[allow(clippy::multiple_unsafe_ops_per_block)]
|
|
// SAFETY: me when uncheck math: 😧 (FIXME)
|
|
let index = unsafe {
|
|
let w = self.width();
|
|
// y * w + x
|
|
let tmp = (y as usize).unchecked_mul(w as usize);
|
|
tmp.unchecked_add(x as usize)
|
|
};
|
|
// SAFETY: 🧐 is unsound? 😖
|
|
let index = unsafe { index.unchecked_mul(CHANNELS) };
|
|
debug_assert!(self.buffer.len() > index);
|
|
index
|
|
}
|
|
|
|
/// Procure a [`ImageCloner`].
|
|
#[must_use = "function does not modify the original image"]
|
|
pub fn cloner(&self) -> ImageCloner<'_, CHANNELS> {
|
|
ImageCloner::from(self.as_ref())
|
|
}
|
|
|
|
/// Reference this image.
|
|
pub fn as_ref(&self) -> Image<&[u8], CHANNELS> {
|
|
// SAFETY: we got constructed okay, parameters must be valid
|
|
unsafe { Image::new(self.width, self.height, &*self.buffer) }
|
|
}
|
|
|
|
#[inline]
|
|
/// Returns a iterator over every pixel
|
|
pub fn chunked(&self) -> impl DoubleEndedIterator<Item = &[u8; CHANNELS]> {
|
|
// SAFETY: 0 sized images illegal
|
|
unsafe { assert_unchecked!(self.buffer.len() > CHANNELS) };
|
|
// SAFETY: no half pixels!
|
|
unsafe { assert_unchecked!(self.buffer.len() % CHANNELS == 0) };
|
|
self.buffer.array_chunks::<CHANNELS>()
|
|
}
|
|
|
|
#[inline]
|
|
/// Flatten the chunks of this image into a slice of slices.
|
|
pub fn flatten(&mut self) -> &[[u8; CHANNELS]] {
|
|
// SAFETY: buffer cannot have half pixels
|
|
unsafe { self.buffer.as_chunks_unchecked::<CHANNELS>() }
|
|
}
|
|
|
|
/// 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(&self, x: u32, y: u32) -> [u8; CHANNELS] {
|
|
// SAFETY: x and y in bounds, slice is okay
|
|
let ptr = unsafe { self.buffer.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 }
|
|
}
|
|
}
|
|
|
|
impl<T: std::ops::DerefMut<Target = [u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
|
|
/// 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(&mut self, x: u32, y: u32) -> &mut [u8] {
|
|
// 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.get_unchecked_mut(idx) }
|
|
}
|
|
|
|
#[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.buffer.len() > CHANNELS) };
|
|
// SAFETY: buffer cannot have half pixels
|
|
unsafe { assert_unchecked!(self.buffer.len() % CHANNELS == 0) };
|
|
self.buffer.array_chunks_mut::<CHANNELS>()
|
|
}
|
|
|
|
/// Create a mutref to this image
|
|
pub fn as_mut(&mut self) -> Image<&mut [u8], CHANNELS> {
|
|
// SAFETY: construction went okay
|
|
unsafe { Image::new(self.width, self.height, &mut self.buffer) }
|
|
}
|
|
|
|
#[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_chunks_unchecked_mut::<CHANNELS>() }
|
|
}
|
|
|
|
/// # 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" meeans.
|
|
unsafe fn copy_within(&mut self, src: std::ops::Range<usize>, dest: usize) {
|
|
let std::ops::Range { start, end } = src;
|
|
debug_assert!(
|
|
dest <= self.buffer.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.buffer.as_mut_ptr();
|
|
std::ptr::copy_nonoverlapping(ptr.add(start), ptr.add(dest), end - start)
|
|
};
|
|
}
|
|
|
|
/// 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
|
|
///
|
|
/// # 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],
|
|
}
|
|
}
|
|
}
|
|
|
|
/// helper macro for defining the save() method.
|
|
macro_rules! save {
|
|
($channels:literal == $clr:ident ($clrhuman:literal)) => {
|
|
impl<T: std::ops::Deref<Target = [u8]>> Image<T, $channels> {
|
|
#[cfg(feature = "save")]
|
|
#[doc = "Save this "]
|
|
#[doc = $clrhuman]
|
|
#[doc = " image."]
|
|
pub fn save(&self, f: impl AsRef<std::path::Path>) {
|
|
let p = std::fs::File::create(f).unwrap();
|
|
let w = &mut std::io::BufWriter::new(p);
|
|
let mut enc = png::Encoder::new(w, self.width(), self.height());
|
|
enc.set_color(png::ColorType::$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().unwrap();
|
|
writer.write_image_data(&self.buffer).unwrap();
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
impl<const CHANNELS: usize> Image<Vec<u8>, CHANNELS> {
|
|
#[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 = std::io::BufReader::new(p);
|
|
let dec = png::Decoder::new(r);
|
|
let mut reader = dec.read_info().unwrap();
|
|
let mut buf = vec![0; reader.output_buffer_size()];
|
|
let info = reader.next_frame(&mut buf).unwrap();
|
|
use png::ColorType::*;
|
|
match info.color_type {
|
|
Indexed | Grayscale => {
|
|
assert_eq!(CHANNELS, 1, "indexed | grayscale requires one channel")
|
|
}
|
|
Rgb => assert_eq!(CHANNELS, 3, "rgb requires three channels"),
|
|
Rgba => assert_eq!(CHANNELS, 4, "rgba requires four channels"),
|
|
GrayscaleAlpha => assert_eq!(CHANNELS, 2, "ya requires two channels"),
|
|
}
|
|
Self::build(info.width, info.height).buf(buf)
|
|
}
|
|
}
|
|
|
|
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;
|