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https://github.com/bend-n/fimg.git
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add Image::crop
This commit is contained in:
parent
df2c7d2436
commit
5839881e25
104
src/lib.rs
104
src/lib.rs
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@ -35,6 +35,7 @@
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//! - [`Image::repeated`]
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//! - [`Image::overlay`](Overlay), [`Image::overlay_at`](OverlayAt), [`Image::overlay_blended`](BlendingOverlay)
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//! - [`Image::blur`]
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//! - [`Image::crop`]
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//!
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//! ## feature flags
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//!
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@ -70,12 +71,12 @@
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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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use std::{num::NonZeroU32, ops::Range};
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mod affine;
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#[cfg(feature = "blur")]
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mod blur;
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#[doc(hidden)]
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pub use sub::{Cropper, SubImage};
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pub mod builder;
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#[doc(hidden)]
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pub mod cloner;
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@ -85,6 +86,7 @@ mod r#dyn;
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pub(crate) mod math;
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mod overlay;
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mod pack;
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mod sub;
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pub use pack::Pack;
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pub mod pixels;
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#[cfg(feature = "scale")]
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@ -383,56 +385,69 @@ macro_rules! make {
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};
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}
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impl<T: AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
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impl<T, const CHANNELS: usize> Image<T, CHANNELS> {
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/// The size of the underlying buffer.
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#[allow(clippy::len_without_is_empty)]
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pub fn len(&self) -> usize {
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self.bytes().len()
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}
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/// Bytes of this image.
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pub fn bytes(&self) -> &[u8] {
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self.buffer.as_ref()
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pub fn len<U>(&self) -> usize
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where
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T: AsRef<[U]>,
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{
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self.buffer().as_ref().len()
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}
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/// # Safety
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///
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/// the output index is not guranteed to be in bounds
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#[inline]
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fn slice(&self, x: u32, y: u32) -> impl SliceIndex<[u8], Output = [u8]> {
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fn slice<U>(&self, x: u32, y: u32) -> Range<usize>
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where
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T: AsRef<[U]>,
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{
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let index = self.at(x, y);
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debug_assert!(self.len() > index);
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// SAFETY: as long as the buffer isnt wrong, this is 😄
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index..unsafe { index.unchecked_add(CHANNELS) }
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}
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/// Procure a [`ImageCloner`].
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#[must_use = "function does not modify the original image"]
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pub fn cloner(&self) -> ImageCloner<'_, CHANNELS> {
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ImageCloner::from(self.as_ref())
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}
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/// Reference this image.
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pub fn as_ref(&self) -> Image<&[u8], CHANNELS> {
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// SAFETY: we got constructed okay, parameters must be valid
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unsafe { Image::new(self.width, self.height, self.bytes()) }
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}
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#[inline]
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/// Returns a iterator over every pixel
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pub fn chunked(&self) -> impl DoubleEndedIterator<Item = &[u8; CHANNELS]> {
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pub fn chunked<'a, U: 'a>(&'a self) -> impl DoubleEndedIterator<Item = &'a [U; CHANNELS]>
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where
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T: AsRef<[U]>,
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{
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// SAFETY: 0 sized images illegal
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unsafe { assert_unchecked!(self.len() > CHANNELS) };
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// SAFETY: no half pixels!
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unsafe { assert_unchecked!(self.len() % CHANNELS == 0) };
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self.bytes().array_chunks::<CHANNELS>()
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self.buffer().as_ref().array_chunks::<CHANNELS>()
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}
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#[inline]
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/// Flatten the chunks of this image into a slice of slices.
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pub fn flatten(&self) -> &[[u8; CHANNELS]] {
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pub fn flatten<U>(&self) -> &[[U; CHANNELS]]
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where
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T: AsRef<[U]>,
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{
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// SAFETY: buffer cannot have half pixels
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unsafe { self.bytes().as_chunks_unchecked::<CHANNELS>() }
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unsafe { self.buffer().as_ref().as_chunks_unchecked::<CHANNELS>() }
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}
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/// Create a mutref to this image
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pub fn as_mut<U>(&mut self) -> Image<&mut [U], CHANNELS>
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where
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T: AsMut<[U]>,
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{
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// SAFETY: construction went okay
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unsafe { Image::new(self.width, self.height, self.buffer.as_mut()) }
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}
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/// Reference this image.
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pub fn as_ref<U>(&self) -> Image<&[U], CHANNELS>
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where
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T: AsRef<[U]>,
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{
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// SAFETY: we got constructed okay, parameters must be valid
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unsafe { Image::new(self.width, self.height, self.buffer().as_ref()) }
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}
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/// Return a pixel at (x, y).
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@ -441,10 +456,13 @@ impl<T: AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
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/// - UB if x, y is out of bounds
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/// - UB if buffer is too small
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#[inline]
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pub unsafe fn pixel(&self, x: u32, y: u32) -> [u8; CHANNELS] {
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pub unsafe fn pixel<U: Copy>(&self, x: u32, y: u32) -> [U; CHANNELS]
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where
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T: AsRef<[U]>,
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{
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// SAFETY: x and y in bounds, slice is okay
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let ptr = unsafe {
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self.buffer
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self.buffer()
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.as_ref()
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.get_unchecked(self.slice(x, y))
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.as_ptr()
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@ -453,22 +471,38 @@ impl<T: AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
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// SAFETY: slice always returns a length of `CHANNELS`, so we `cast()` it for convenience.
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unsafe { *ptr }
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}
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}
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impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
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/// Return a mutable reference to a pixel at (x, y).
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/// # Safety
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///
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/// - UB if x, y is out of bounds
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/// - UB if buffer is too small
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#[inline]
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pub unsafe fn pixel_mut(&mut self, x: u32, y: u32) -> &mut [u8] {
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pub unsafe fn pixel_mut<U: Copy>(&mut self, x: u32, y: u32) -> &mut [U]
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where
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T: AsMut<[U]> + AsRef<[U]>,
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{
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// SAFETY: we have been told x, y is in bounds.
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let idx = self.slice(x, y);
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// SAFETY: slice should always return a valid index
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unsafe { self.buffer.as_mut().get_unchecked_mut(idx) }
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}
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}
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impl<T: AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
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/// Bytes of this image.
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pub fn bytes(&self) -> &[u8] {
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self.buffer.as_ref()
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}
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/// Procure a [`ImageCloner`].
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#[must_use = "function does not modify the original image"]
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pub fn cloner(&self) -> ImageCloner<'_, CHANNELS> {
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ImageCloner::from(self.as_ref())
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}
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}
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impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
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#[inline]
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/// Returns a iterator over every pixel, mutably
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pub fn chunked_mut(&mut self) -> impl Iterator<Item = &mut [u8; CHANNELS]> {
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@ -479,12 +513,6 @@ impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
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self.buffer.as_mut().array_chunks_mut::<CHANNELS>()
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}
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/// Create a mutref to this image
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pub fn as_mut(&mut self) -> Image<&mut [u8], CHANNELS> {
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// SAFETY: construction went okay
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unsafe { Image::new(self.width, self.height, self.buffer.as_mut()) }
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}
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#[inline]
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/// Flatten the chunks of this image into a mutable slice of slices.
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pub fn flatten_mut(&mut self) -> &mut [[u8; CHANNELS]] {
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183
src/sub.rs
Normal file
183
src/sub.rs
Normal file
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@ -0,0 +1,183 @@
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use std::{marker::PhantomData, num::NonZeroU32};
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use crate::Image;
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/// A smaller part of a larger image.
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///
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/// ```text
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/// ┏━━━━━━━━━━━━━━┓ hard borders represent the full image
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/// ┃ 1 2 3 1 ┃ vvvv the top left of the new image
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/// ┃ ┌──────┐ ┃ crop(2, 2).from(1, 1)
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/// ┃ 4 │ 5 6 │ 2 ┃ ^^^^ width and height
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/// ┃ │ │ ┃
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/// ┃ 7 │ 8 9 │ 3 ┃
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/// ┗━━━┷━━━━━━┷━━━┛ soft borders represent the new image
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/// ```
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#[derive(Clone)]
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pub struct SubImage<T, const CHANNELS: usize> {
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inner: Image<T, CHANNELS>,
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/// in pixels
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offset_x: u32,
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real_width: NonZeroU32,
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real_height: NonZeroU32,
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}
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/// Trait for cropping a image.
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pub trait Cropper<T, const C: usize> {
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/// # Panics
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///
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/// if w - y == 0
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fn from(self, x: u32, y: u32) -> SubImage<T, C>;
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}
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impl<T: Clone, const N: usize> Copy for SubImage<T, N> where Image<T, N>: Copy {}
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macro_rules! def {
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($t:ty, $($what:ident)?) => {
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struct Crop<'a, T, const C: usize> {
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dimensions: (NonZeroU32, NonZeroU32),
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_d: PhantomData<SubImage<$t, C>>,
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image: Image<$t, C>,
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}
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impl<'a, T, const C: usize> Cropper<$t, C> for Crop<'a, T, C> {
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fn from(self, x: u32, y: u32) -> SubImage<$t, C> {
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let w = self.image.width();
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// SAFETY: ctor
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let i = unsafe {
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Image::new(
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self.image.width,
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NonZeroU32::new(self.image.height() - y).unwrap(),
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&$($what)?(self.image.take_buffer()[(y as usize * C) * w as usize..]),
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)
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};
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SubImage {
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offset_x: x,
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inner: i,
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real_width: self.dimensions.0,
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real_height: self.dimensions.1,
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}
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}
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}
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};
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}
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impl<T, const C: usize> Image<T, C> {
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/// Crop a image.
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///
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/// The signature looks something like: `i.crop(width, height).from(top_left_x, top_left_y)`, which gives you a <code>[SubImage]<&\[T\], _></code>
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///
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/// If you want a owned image, `i.crop(w, h).from(x, y).own()` gets you a <code>[`Image`]<[Box]<\[T\], _>></code> back.
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///
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/// ```
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/// # use fimg::{Image, Cropper};
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/// let mut i = Image::<_, 1>::build(4, 3).buf([
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/// 1, 2, 3, 1,
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/// 4, 5, 6, 2,
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/// 7, 8, 9, 3,
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/// ]);
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/// let c = i.crop(2, 2).from(1, 1);
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/// # unsafe {
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/// assert_eq!(c.pixel(0, 0), [5]);
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/// assert_eq!(c.pixel(1, 1), [9]);
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/// assert_eq!(
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/// c.own().bytes(),
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/// &[5, 6,
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/// 8, 9]
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/// );
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/// # }
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/// ```
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///
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/// # Panics
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///
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/// if width == 0 || height == 0
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pub fn crop<'a, U: 'a>(&'a self, width: u32, height: u32) -> impl Cropper<&'a [U], C>
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where
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T: AsRef<[U]>,
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{
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def!(&'a [T],);
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Crop {
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dimensions: (
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NonZeroU32::new(width).expect("Image::crop panics when width == 0"),
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NonZeroU32::new(height).expect("Image::crop panics when height == 0"),
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),
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_d: PhantomData,
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image: self.as_ref(),
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}
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}
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/// Like [`Image::crop`], but returns a mutable [`SubImage`].
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pub fn crop_mut<'a, U: 'a>(
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&'a mut self,
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width: u32,
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height: u32,
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) -> impl Cropper<&'a mut [U], C>
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where
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T: AsMut<[U]> + AsRef<[U]>,
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{
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def!(&'a mut [T], mut);
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Crop {
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dimensions: (
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NonZeroU32::new(width).expect("Image::crop panics when width == 0"),
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NonZeroU32::new(height).expect("Image::crop panics when height == 0"),
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),
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_d: PhantomData,
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image: self.as_mut(),
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}
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}
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}
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impl<T: Clone, const C: usize> SubImage<&[T], C> {
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/// Clones this [`SubImage`] into its own [`Image`]
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pub fn own(&self) -> Image<Box<[T]>, C> {
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let mut out =
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Vec::with_capacity(self.real_width.get() as usize * self.inner.height() as usize * C);
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for row in self
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.inner
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.buffer
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.chunks_exact(self.inner.width.get() as usize)
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.take(self.real_height.get() as usize)
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{
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out.extend_from_slice(
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&row[self.offset_x as usize
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..self.offset_x as usize + self.real_width.get() as usize],
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);
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}
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// SAFETY: ctor
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unsafe { Image::new(self.real_width, self.real_height, out.into()) }
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}
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}
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// TODO crop()
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impl<W, const C: usize> SubImage<W, C> {
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/// Get a pixel.
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///
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/// # Safety
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///
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/// this pixel must be in bounds.
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pub unsafe fn pixel<U: Copy>(&self, x: u32, y: u32) -> [U; C]
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where
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W: AsRef<[U]>,
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{
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// note: if you get a pixel, in release mode, that is in bounds of the outer image, but not the sub image, that would be library-ub.
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debug_assert!(x < self.real_width.get());
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debug_assert!(y < self.real_height.get());
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// SAFETY: caller
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unsafe { self.inner.pixel(x + self.offset_x, y) }
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}
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/// Get a pixel, mutably.
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///
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/// # Safety
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///
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/// this pixel must be in bounds.
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pub unsafe fn pixel_mut<U: Copy>(&mut self, x: u32, y: u32) -> &mut [U]
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where
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W: AsMut<[U]> + AsRef<[U]>,
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{
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debug_assert!(x < self.real_width.get());
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debug_assert!(y < self.real_height.get());
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// SAFETY: caller
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unsafe { self.inner.pixel_mut(x, y) }
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}
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}
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