| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.23.14/./src/flat.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>flat.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../image/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../image/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <span id="1645">1645</span> |
| </pre><pre class="rust"><code><span class="doccomment">//! Image representations for ffi. |
| //! |
| //! # Usage |
| //! |
| //! Imagine you want to offer a very simple ffi interface: The caller provides an image buffer and |
| //! your program creates a thumbnail from it and dumps that image as `png`. This module is designed |
| //! to help you transition from raw memory data to Rust representation. |
| //! |
| //! ```no_run |
| //! use std::ptr; |
| //! use std::slice; |
| //! use image::Rgb; |
| //! use image::flat::{FlatSamples, SampleLayout}; |
| //! use image::imageops::thumbnail; |
| //! |
| //! #[no_mangle] |
| //! pub extern "C" fn store_rgb8_compressed( |
| //! data: *const u8, len: usize, |
| //! layout: *const SampleLayout |
| //! ) |
| //! -> bool |
| //! { |
| //! let samples = unsafe { slice::from_raw_parts(data, len) }; |
| //! let layout = unsafe { ptr::read(layout) }; |
| //! |
| //! let buffer = FlatSamples { |
| //! samples, |
| //! layout, |
| //! color_hint: None, |
| //! }; |
| //! |
| //! let view = match buffer.as_view::<Rgb<u8>>() { |
| //! Err(_) => return false, // Invalid layout. |
| //! Ok(view) => view, |
| //! }; |
| //! |
| //! thumbnail(&view, 64, 64) |
| //! .save("output.png") |
| //! .map(|_| true) |
| //! .unwrap_or_else(|_| false) |
| //! } |
| //! ``` |
| //! |
| </span><span class="kw">use </span>std::{cmp, error, fmt}; |
| <span class="kw">use </span>std::ops::{Deref, Index, IndexMut}; |
| <span class="kw">use </span>std::marker::PhantomData; |
| |
| <span class="kw">use </span>num_traits::Zero; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::ImageBuffer; |
| <span class="kw">use </span><span class="kw">crate</span>::color::ColorType; |
| <span class="kw">use </span><span class="kw">crate</span>::error::{ImageError, ImageFormatHint, DecodingError, ParameterError, ParameterErrorKind, UnsupportedError, UnsupportedErrorKind}; |
| <span class="kw">use </span><span class="kw">crate</span>::image::{GenericImage, GenericImageView}; |
| <span class="kw">use </span><span class="kw">crate</span>::traits::{Pixel, Primitive}; |
| |
| <span class="doccomment">/// A flat buffer over a (multi channel) image. |
| /// |
| /// In contrast to `ImageBuffer`, this representation of a sample collection is much more lenient |
| /// in the layout thereof. It also allows grouping by color planes instead of by pixel as long as |
| /// the strides of each extent are constant. This struct itself has no invariants on the strides |
| /// but not every possible configuration can be interpreted as a [`GenericImageView`] or |
| /// [`GenericImage`]. The methods [`as_view`] and [`as_view_mut`] construct the actual implementors |
| /// of these traits and perform necessary checks. To manually perform this and other layout checks |
| /// use [`is_normal`] or [`has_aliased_samples`]. |
| /// |
| /// Instances can be constructed not only by hand. The buffer instances returned by library |
| /// functions such as [`ImageBuffer::as_flat_samples`] guarantee that the conversion to a generic |
| /// image or generic view succeeds. A very different constructor is [`with_monocolor`]. It uses a |
| /// single pixel as the backing storage for an arbitrarily sized read-only raster by mapping each |
| /// pixel to the same samples by setting some strides to `0`. |
| /// |
| /// [`GenericImage`]: ../trait.GenericImage.html |
| /// [`GenericImageView`]: ../trait.GenericImageView.html |
| /// [`ImageBuffer::as_flat_samples`]: ../struct.ImageBuffer.html#method.as_flat_samples |
| /// [`is_normal`]: #method.is_normal |
| /// [`has_aliased_samples`]: #method.has_aliased_samples |
| /// [`as_view`]: #method.as_view |
| /// [`as_view_mut`]: #method.as_view_mut |
| /// [`with_monocolor`]: #method.with_monocolor |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>FlatSamples<Buffer> { |
| <span class="doccomment">/// Underlying linear container holding sample values. |
| </span><span class="kw">pub </span>samples: Buffer, |
| |
| <span class="doccomment">/// A `repr(C)` description of the layout of buffer samples. |
| </span><span class="kw">pub </span>layout: SampleLayout, |
| |
| <span class="doccomment">/// Supplementary color information. |
| /// |
| /// You may keep this as `None` in most cases. This is NOT checked in `View` or other |
| /// converters. It is intended mainly as a way for types that convert to this buffer type to |
| /// attach their otherwise static color information. A dynamic image representation could |
| /// however use this to resolve representational ambiguities such as the order of RGB channels. |
| </span><span class="kw">pub </span>color_hint: <span class="prelude-ty">Option</span><ColorType>, |
| } |
| |
| <span class="doccomment">/// A ffi compatible description of a sample buffer. |
| </span><span class="attribute">#[repr(C)] |
| #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)] |
| </span><span class="kw">pub struct </span>SampleLayout { |
| <span class="doccomment">/// The number of channels in the color representation of the image. |
| </span><span class="kw">pub </span>channels: u8, |
| |
| <span class="doccomment">/// Add this to an index to get to the sample in the next channel. |
| </span><span class="kw">pub </span>channel_stride: usize, |
| |
| <span class="doccomment">/// The width of the represented image. |
| </span><span class="kw">pub </span>width: u32, |
| |
| <span class="doccomment">/// Add this to an index to get to the next sample in x-direction. |
| </span><span class="kw">pub </span>width_stride: usize, |
| |
| <span class="doccomment">/// The height of the represented image. |
| </span><span class="kw">pub </span>height: u32, |
| |
| <span class="doccomment">/// Add this to an index to get to the next sample in y-direction. |
| </span><span class="kw">pub </span>height_stride: usize, |
| } |
| |
| <span class="doccomment">/// Helper struct for an unnamed (stride, length) pair. |
| </span><span class="attribute">#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)] |
| </span><span class="kw">struct </span>Dim(usize, usize); |
| |
| <span class="kw">impl </span>SampleLayout { |
| <span class="doccomment">/// Describe a row-major image packed in all directions. |
| /// |
| /// The resulting will surely be `NormalForm::RowMajorPacked`. It can therefore be converted to |
| /// safely to an `ImageBuffer` with a large enough underlying buffer. |
| /// |
| /// ``` |
| /// # use image::flat::{NormalForm, SampleLayout}; |
| /// let layout = SampleLayout::row_major_packed(3, 640, 480); |
| /// assert!(layout.is_normal(NormalForm::RowMajorPacked)); |
| /// ``` |
| /// |
| /// # Panics |
| /// |
| /// On platforms where `usize` has the same size as `u32` this panics when the resulting stride |
| /// in the `height` direction would be larger than `usize::max_value()`. On other platforms |
| /// where it can surely accomodate `u8::max_value() * u32::max_value(), this can never happen. |
| </span><span class="kw">pub fn </span>row_major_packed(channels: u8, width: u32, height: u32) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>height_stride = (channels <span class="kw">as </span>usize).checked_mul(width <span class="kw">as </span>usize) |
| .expect(<span class="string">"Row major packed image can not be described because it does not fit into memory"</span>); |
| SampleLayout { |
| channels, |
| channel_stride: <span class="number">1</span>, |
| width, |
| width_stride: channels <span class="kw">as </span>usize, |
| height, |
| height_stride, |
| } |
| } |
| |
| <span class="doccomment">/// Describe a column-major image packed in all directions. |
| /// |
| /// The resulting will surely be `NormalForm::ColumnMajorPacked`. This is not particularly |
| /// useful for conversion but can be used to describe such a buffer without pitfalls. |
| /// |
| /// ``` |
| /// # use image::flat::{NormalForm, SampleLayout}; |
| /// let layout = SampleLayout::column_major_packed(3, 640, 480); |
| /// assert!(layout.is_normal(NormalForm::ColumnMajorPacked)); |
| /// ``` |
| /// |
| /// # Panics |
| /// |
| /// On platforms where `usize` has the same size as `u32` this panics when the resulting stride |
| /// in the `width` direction would be larger than `usize::max_value()`. On other platforms |
| /// where it can surely accomodate `u8::max_value() * u32::max_value(), this can never happen. |
| </span><span class="kw">pub fn </span>column_major_packed(channels: u8, width: u32, height: u32) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>width_stride = (channels <span class="kw">as </span>usize).checked_mul(height <span class="kw">as </span>usize) |
| .expect(<span class="string">"Column major packed image can not be described because it does not fit into memory"</span>); |
| SampleLayout { |
| channels, |
| channel_stride: <span class="number">1</span>, |
| height, |
| height_stride: channels <span class="kw">as </span>usize, |
| width, |
| width_stride, |
| } |
| } |
| |
| <span class="doccomment">/// Get the strides for indexing matrix-like `[(c, w, h)]`. |
| /// |
| /// For a row-major layout with grouped samples, this tuple is strictly |
| /// increasing. |
| </span><span class="kw">pub fn </span>strides_cwh(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, usize, usize) { |
| (<span class="self">self</span>.channel_stride, <span class="self">self</span>.width_stride, <span class="self">self</span>.height_stride) |
| } |
| |
| <span class="doccomment">/// Get the dimensions `(channels, width, height)`. |
| /// |
| /// The interface is optimized for use with `strides_cwh` instead. The channel extent will be |
| /// before width and height. |
| </span><span class="kw">pub fn </span>extents(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, usize, usize) { |
| (<span class="self">self</span>.channels <span class="kw">as </span>usize, <span class="self">self</span>.width <span class="kw">as </span>usize, <span class="self">self</span>.height <span class="kw">as </span>usize) |
| } |
| |
| <span class="doccomment">/// Tuple of bounds in the order of coordinate inputs. |
| /// |
| /// This function should be used whenever working with image coordinates opposed to buffer |
| /// coordinates. The only difference compared to `extents` is the output type. |
| </span><span class="kw">pub fn </span>bounds(<span class="kw-2">&</span><span class="self">self</span>) -> (u8, u32, u32) { |
| (<span class="self">self</span>.channels, <span class="self">self</span>.width, <span class="self">self</span>.height) |
| } |
| |
| <span class="doccomment">/// Get the minimum length of a buffer such that all in-bounds samples have valid indices. |
| /// |
| /// This method will allow zero strides, allowing compact representations of monochrome images. |
| /// To check that no aliasing occurs, try `check_alias_invariants`. For compact images (no |
| /// aliasing and no unindexed samples) this is `width*height*channels`. But for both of the |
| /// other cases, the reasoning is slightly more involved. |
| /// |
| /// # Explanation |
| /// |
| /// Note that there is a difference between `min_length` and the index of the sample |
| /// 'one-past-the-end`. This is due to strides that may be larger than the dimension below. |
| /// |
| /// ## Example with holes |
| /// |
| /// Let's look at an example of a grayscale image with |
| /// * `width_stride = 1` |
| /// * `width = 2` |
| /// * `height_stride = 3` |
| /// * `height = 2` |
| /// |
| /// ```text |
| /// | x x | x x m | $ |
| /// min_length m ^ |
| /// ^ one-past-the-end $ |
| /// ``` |
| /// |
| /// The difference is also extreme for empty images with large strides. The one-past-the-end |
| /// sample index is still as large as the largest of these strides while `min_length = 0`. |
| /// |
| /// ## Example with aliasing |
| /// |
| /// The concept gets even more important when you allow samples to alias each other. Here we |
| /// have the buffer of a small grayscale image where this is the case, this time we will first |
| /// show the buffer and then the individual rows below. |
| /// |
| /// * `width_stride = 1` |
| /// * `width = 3` |
| /// * `height_stride = 2` |
| /// * `height = 2` |
| /// |
| /// ```text |
| /// 1 2 3 4 5 m |
| /// |1 2 3| row one |
| /// |3 4 5| row two |
| /// ^ m min_length |
| /// ^ ??? one-past-the-end |
| /// ``` |
| /// |
| /// This time 'one-past-the-end' is not even simply the largest stride times the extent of its |
| /// dimension. That still points inside the image because `height*height_stride = 4` but also |
| /// `index_of(1, 2) = 4`. |
| </span><span class="kw">pub fn </span>min_length(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">if </span><span class="self">self</span>.width == <span class="number">0 </span>|| <span class="self">self</span>.height == <span class="number">0 </span>|| <span class="self">self</span>.channels == <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="number">0</span>) |
| } |
| |
| <span class="self">self</span>.index(<span class="self">self</span>.channels - <span class="number">1</span>, <span class="self">self</span>.width - <span class="number">1</span>, <span class="self">self</span>.height - <span class="number">1</span>) |
| .and_then(|idx| idx.checked_add(<span class="number">1</span>)) |
| } |
| |
| <span class="doccomment">/// Check if a buffer of length `len` is large enough. |
| </span><span class="kw">pub fn </span>fits(<span class="kw-2">&</span><span class="self">self</span>, len: usize) -> bool { |
| <span class="self">self</span>.min_length().map(|min| len >= min).unwrap_or(<span class="bool-val">false</span>) |
| } |
| |
| <span class="doccomment">/// The extents of this array, in order of increasing strides. |
| </span><span class="kw">fn </span>increasing_stride_dims(<span class="kw-2">&</span><span class="self">self</span>) -> [Dim; <span class="number">3</span>] { |
| <span class="comment">// Order extents by strides, then check that each is less equal than the next stride. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>grouped: [Dim; <span class="number">3</span>] = [ |
| Dim(<span class="self">self</span>.channel_stride, <span class="self">self</span>.channels <span class="kw">as </span>usize), |
| Dim(<span class="self">self</span>.width_stride, <span class="self">self</span>.width <span class="kw">as </span>usize), |
| Dim(<span class="self">self</span>.height_stride, <span class="self">self</span>.height <span class="kw">as </span>usize)]; |
| |
| grouped.sort(); |
| |
| <span class="kw">let </span>(min_dim, mid_dim, max_dim) = (grouped[<span class="number">0</span>], grouped[<span class="number">1</span>], grouped[<span class="number">2</span>]); |
| <span class="macro">assert!</span>(min_dim.stride() <= mid_dim.stride() && mid_dim.stride() <= max_dim.stride()); |
| |
| grouped |
| } |
| |
| <span class="doccomment">/// If there are any samples aliasing each other. |
| /// |
| /// If this is not the case, it would always be safe to allow mutable access to two different |
| /// samples at the same time. Otherwise, this operation would need additional checks. When one |
| /// dimension overflows `usize` with its stride we also consider this aliasing. |
| </span><span class="kw">pub fn </span>has_aliased_samples(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">let </span>grouped = <span class="self">self</span>.increasing_stride_dims(); |
| <span class="kw">let </span>(min_dim, mid_dim, max_dim) = (grouped[<span class="number">0</span>], grouped[<span class="number">1</span>], grouped[<span class="number">2</span>]); |
| |
| <span class="kw">let </span>min_size = <span class="kw">match </span>min_dim.checked_len() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="bool-val">true</span>, |
| <span class="prelude-val">Some</span>(size) => size, |
| }; |
| |
| <span class="kw">let </span>mid_size = <span class="kw">match </span>mid_dim.checked_len() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="bool-val">true</span>, |
| <span class="prelude-val">Some</span>(size) => size, |
| }; |
| |
| <span class="kw">let </span>_max_size = <span class="kw">match </span>max_dim.checked_len() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="bool-val">true</span>, |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => (), <span class="comment">// Only want to know this didn't overflow. |
| </span>}; |
| |
| <span class="comment">// Each higher dimension must walk over all of one lower dimension. |
| </span>min_size > mid_dim.stride() || mid_size > max_dim.stride() |
| } |
| |
| <span class="doccomment">/// Check if a buffer fulfills the requirements of a normal form. |
| /// |
| /// Certain conversions have preconditions on the structure of the sample buffer that are not |
| /// captured (by design) by the type system. These are then checked before the conversion. Such |
| /// checks can all be done in constant time and will not inspect the buffer content. You can |
| /// perform these checks yourself when the conversion is not required at this moment but maybe |
| /// still performed later. |
| </span><span class="kw">pub fn </span>is_normal(<span class="kw-2">&</span><span class="self">self</span>, form: NormalForm) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.has_aliased_samples() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| |
| <span class="kw">if </span>form >= NormalForm::PixelPacked && <span class="self">self</span>.channel_stride != <span class="number">1 </span>{ |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| |
| <span class="kw">if </span>form >= NormalForm::ImagePacked { |
| <span class="comment">// has aliased already checked for overflows. |
| </span><span class="kw">let </span>grouped = <span class="self">self</span>.increasing_stride_dims(); |
| <span class="kw">let </span>(min_dim, mid_dim, max_dim) = (grouped[<span class="number">0</span>], grouped[<span class="number">1</span>], grouped[<span class="number">2</span>]); |
| |
| <span class="kw">if </span><span class="number">1 </span>!= min_dim.stride() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| |
| <span class="kw">if </span>min_dim.len() != mid_dim.stride() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| |
| <span class="kw">if </span>mid_dim.len() != max_dim.stride() { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| } |
| |
| <span class="kw">if </span>form >= NormalForm::RowMajorPacked { |
| <span class="kw">if </span><span class="self">self</span>.width_stride != <span class="self">self</span>.channels <span class="kw">as </span>usize { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| |
| <span class="kw">if </span><span class="self">self</span>.width <span class="kw">as </span>usize<span class="kw-2">*</span><span class="self">self</span>.width_stride != <span class="self">self</span>.height_stride { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| } |
| |
| <span class="kw">if </span>form >= NormalForm::ColumnMajorPacked { |
| <span class="kw">if </span><span class="self">self</span>.height_stride != <span class="self">self</span>.channels <span class="kw">as </span>usize { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| |
| <span class="kw">if </span><span class="self">self</span>.height <span class="kw">as </span>usize<span class="kw-2">*</span><span class="self">self</span>.height_stride != <span class="self">self</span>.width_stride { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| } |
| |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="doccomment">/// Check that the pixel and the channel index are in bounds. |
| /// |
| /// An in-bound coordinate does not yet guarantee that the corresponding calculation of a |
| /// buffer index does not overflow. However, if such a buffer large enough to hold all samples |
| /// actually exists in memory, this porperty of course follows. |
| </span><span class="kw">pub fn </span>in_bounds(<span class="kw-2">&</span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> bool { |
| channel < <span class="self">self</span>.channels && x < <span class="self">self</span>.width && y < <span class="self">self</span>.height |
| } |
| |
| <span class="doccomment">/// Resolve the index of a particular sample. |
| /// |
| /// `None` if the index is outside the bounds or does not fit into a `usize`. |
| </span><span class="kw">pub fn </span>index(<span class="kw-2">&</span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">if </span>!<span class="self">self</span>.in_bounds(channel, x, y) { |
| <span class="kw">return </span><span class="prelude-val">None |
| </span>} |
| |
| <span class="self">self</span>.index_ignoring_bounds(channel <span class="kw">as </span>usize, x <span class="kw">as </span>usize, y <span class="kw">as </span>usize) |
| } |
| |
| <span class="doccomment">/// Get the theoretical position of sample (channel, x, y). |
| /// |
| /// The 'check' is for overflow during index calculation, not that it is contained in the |
| /// image. Two samples may return the same index, even when one of them is out of bounds. This |
| /// happens when all strides are `0`, i.e. the image is an arbitrarily large monochrome image. |
| </span><span class="kw">pub fn </span>index_ignoring_bounds(<span class="kw-2">&</span><span class="self">self</span>, channel: usize, x: usize, y: usize) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>idx_c = (channel <span class="kw">as </span>usize).checked_mul(<span class="self">self</span>.channel_stride); |
| <span class="kw">let </span>idx_x = (x <span class="kw">as </span>usize).checked_mul(<span class="self">self</span>.width_stride); |
| <span class="kw">let </span>idx_y = (y <span class="kw">as </span>usize).checked_mul(<span class="self">self</span>.height_stride); |
| |
| <span class="kw">let </span>(idx_c, idx_x, idx_y) = <span class="kw">match </span>(idx_c, idx_x, idx_y) { |
| (<span class="prelude-val">Some</span>(idx_c), <span class="prelude-val">Some</span>(idx_x), <span class="prelude-val">Some</span>(idx_y)) => (idx_c, idx_x, idx_y), |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| |
| <span class="prelude-val">Some</span>(<span class="number">0usize</span>) |
| .and_then(|b| b.checked_add(idx_c)) |
| .and_then(|b| b.checked_add(idx_x)) |
| .and_then(|b| b.checked_add(idx_y)) |
| } |
| |
| <span class="doccomment">/// Get an index provided it is inbouds. |
| /// |
| /// Assumes that the image is backed by some sufficiently large buffer. Then computation can |
| /// not overflow as we could represent the maximum coordinate. Since overflow is defined either |
| /// way, this method can not be unsafe. |
| </span><span class="kw">pub fn </span>in_bounds_index(<span class="kw-2">&</span><span class="self">self</span>, c: u8, x: u32, y: u32) -> usize { |
| <span class="kw">let </span>(c_stride, x_stride, y_stride) = <span class="self">self</span>.strides_cwh(); |
| (y <span class="kw">as </span>usize * y_stride) + (x <span class="kw">as </span>usize * x_stride) + (c <span class="kw">as </span>usize * c_stride) |
| } |
| |
| |
| <span class="doccomment">/// Shrink the image to the minimum of current and given extents. |
| /// |
| /// This does not modify the strides, so that the resulting sample buffer may have holes |
| /// created by the shrinking operation. Shrinking could also lead to an non-aliasing image when |
| /// samples had aliased each other before. |
| </span><span class="kw">pub fn </span>shrink_to(<span class="kw-2">&mut </span><span class="self">self</span>, channels: u8, width: u32, height: u32) { |
| <span class="self">self</span>.channels = <span class="self">self</span>.channels.min(channels); |
| <span class="self">self</span>.width = <span class="self">self</span>.width.min(width); |
| <span class="self">self</span>.height = <span class="self">self</span>.height.min(height); |
| } |
| } |
| |
| <span class="kw">impl </span>Dim { |
| <span class="kw">fn </span>stride(<span class="self">self</span>) -> usize { |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| |
| <span class="doccomment">/// Length of this dimension in memory. |
| </span><span class="kw">fn </span>checked_len(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.<span class="number">0</span>.checked_mul(<span class="self">self</span>.<span class="number">1</span>) |
| } |
| |
| <span class="kw">fn </span>len(<span class="self">self</span>) -> usize { |
| <span class="self">self</span>.<span class="number">0</span><span class="kw-2">*</span><span class="self">self</span>.<span class="number">1 |
| </span>} |
| } |
| |
| <span class="kw">impl</span><Buffer> FlatSamples<Buffer> { |
| <span class="doccomment">/// Get the strides for indexing matrix-like `[(c, w, h)]`. |
| /// |
| /// For a row-major layout with grouped samples, this tuple is strictly |
| /// increasing. |
| </span><span class="kw">pub fn </span>strides_cwh(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, usize, usize) { |
| <span class="self">self</span>.layout.strides_cwh() |
| } |
| |
| <span class="doccomment">/// Get the dimensions `(channels, width, height)`. |
| /// |
| /// The interface is optimized for use with `strides_cwh` instead. The channel extent will be |
| /// before width and height. |
| </span><span class="kw">pub fn </span>extents(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, usize, usize) { |
| <span class="self">self</span>.layout.extents() |
| } |
| |
| <span class="doccomment">/// Tuple of bounds in the order of coordinate inputs. |
| /// |
| /// This function should be used whenever working with image coordinates opposed to buffer |
| /// coordinates. The only difference compared to `extents` is the output type. |
| </span><span class="kw">pub fn </span>bounds(<span class="kw-2">&</span><span class="self">self</span>) -> (u8, u32, u32) { |
| <span class="self">self</span>.layout.bounds() |
| } |
| |
| <span class="doccomment">/// Get a reference based version. |
| </span><span class="kw">pub fn </span>as_ref<T>(<span class="kw-2">&</span><span class="self">self</span>) -> FlatSamples<<span class="kw-2">&</span>[T]> <span class="kw">where </span>Buffer: AsRef<[T]> { |
| FlatSamples { |
| samples: <span class="self">self</span>.samples.as_ref(), |
| layout: <span class="self">self</span>.layout, |
| color_hint: <span class="self">self</span>.color_hint, |
| } |
| } |
| |
| <span class="doccomment">/// Get a mutable reference based version. |
| </span><span class="kw">pub fn </span>as_mut<T>(<span class="kw-2">&mut </span><span class="self">self</span>) -> FlatSamples<<span class="kw-2">&mut </span>[T]> <span class="kw">where </span>Buffer: AsMut<[T]> { |
| FlatSamples { |
| samples: <span class="self">self</span>.samples.as_mut(), |
| layout: <span class="self">self</span>.layout, |
| color_hint: <span class="self">self</span>.color_hint, |
| } |
| } |
| |
| <span class="doccomment">/// Copy the data into an owned vector. |
| </span><span class="kw">pub fn </span>to_vec<T>(<span class="kw-2">&</span><span class="self">self</span>) -> FlatSamples<Vec<T>> |
| <span class="kw">where </span>T: Clone, Buffer: AsRef<[T]> |
| { |
| FlatSamples { |
| samples: <span class="self">self</span>.samples.as_ref().to_vec(), |
| layout: <span class="self">self</span>.layout, |
| color_hint: <span class="self">self</span>.color_hint, |
| } |
| } |
| |
| <span class="doccomment">/// Get a reference to a single sample. |
| /// |
| /// This more restrictive than the method based on `std::ops::Index` but guarantees to properly |
| /// check all bounds and not panic as long as `Buffer::as_ref` does not do so. |
| /// |
| /// ``` |
| /// # use image::{RgbImage}; |
| /// let flat = RgbImage::new(480, 640).into_flat_samples(); |
| /// |
| /// // Get the blue channel at (10, 10). |
| /// assert!(flat.get_sample(1, 10, 10).is_some()); |
| /// |
| /// // There is no alpha channel. |
| /// assert!(flat.get_sample(3, 10, 10).is_none()); |
| /// ``` |
| /// |
| /// For cases where a special buffer does not provide `AsRef<[T]>`, consider encapsulating |
| /// bounds checks with `min_length` in a type similar to `View`. Then you may use |
| /// `in_bounds_index` as a small speedup over the index calculation of this method which relies |
| /// on `index_ignoring_bounds` since it can not have a-priori knowledge that the sample |
| /// coordinate is in fact backed by any memory buffer. |
| </span><span class="kw">pub fn </span>get_sample<T>(<span class="kw-2">&</span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>T> |
| <span class="kw">where </span>Buffer: AsRef<[T]>, |
| { |
| <span class="self">self</span>.index(channel, x, y).and_then(|idx| <span class="self">self</span>.samples.as_ref().get(idx)) |
| } |
| |
| |
| <span class="doccomment">/// Get a mutable reference to a single sample. |
| /// |
| /// This more restrictive than the method based on `std::ops::IndexMut` but guarantees to |
| /// properly check all bounds and not panic as long as `Buffer::as_ref` does not do so. |
| /// Contrary to conversion to `ViewMut`, this does not require that samples are packed since it |
| /// does not need to convert samples to a color representation. |
| /// |
| /// **WARNING**: Note that of course samples may alias, so that the mutable reference returned |
| /// here can in fact modify more than the coordinate in the argument. |
| /// |
| /// ``` |
| /// # use image::{RgbImage}; |
| /// let mut flat = RgbImage::new(480, 640).into_flat_samples(); |
| /// |
| /// // Assign some new color to the blue channel at (10, 10). |
| /// *flat.get_mut_sample(1, 10, 10).unwrap() = 255; |
| /// |
| /// // There is no alpha channel. |
| /// assert!(flat.get_mut_sample(3, 10, 10).is_none()); |
| /// ``` |
| /// |
| /// For cases where a special buffer does not provide `AsRef<[T]>`, consider encapsulating |
| /// bounds checks with `min_length` in a type similar to `View`. Then you may use |
| /// `in_bounds_index` as a small speedup over the index calculation of this method which relies |
| /// on `index_ignoring_bounds` since it can not have a-priori knowledge that the sample |
| /// coordinate is in fact backed by any memory buffer. |
| </span><span class="kw">pub fn </span>get_mut_sample<T>(<span class="kw-2">&mut </span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>T> |
| <span class="kw">where </span>Buffer: AsMut<[T]>, |
| { |
| <span class="kw">match </span><span class="self">self</span>.index(channel, x, y) { |
| <span class="prelude-val">None </span>=> <span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(idx) => <span class="self">self</span>.samples.as_mut().get_mut(idx), |
| } |
| } |
| |
| <span class="doccomment">/// View this buffer as an image over some type of pixel. |
| /// |
| /// This first ensures that all in-bounds coordinates refer to valid indices in the sample |
| /// buffer. It also checks that the specified pixel format expects the same number of channels |
| /// that are present in this buffer. Neither are larger nor a smaller number will be accepted. |
| /// There is no automatic conversion. |
| </span><span class="kw">pub fn </span>as_view<P>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><View<<span class="kw-2">&</span>[P::Subpixel], P>, Error> |
| <span class="kw">where </span>P: Pixel, Buffer: AsRef<[P::Subpixel]>, |
| { |
| <span class="kw">if </span><span class="self">self</span>.layout.channels != P::CHANNEL_COUNT { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::WrongColor(P::COLOR_TYPE)) |
| } |
| |
| <span class="kw">let </span>as_ref = <span class="self">self</span>.samples.as_ref(); |
| <span class="kw">if </span>!<span class="self">self</span>.layout.fits(as_ref.len()) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::TooLarge) |
| } |
| |
| <span class="prelude-val">Ok</span>(View { |
| inner: FlatSamples { |
| samples: as_ref, |
| layout: <span class="self">self</span>.layout, |
| color_hint: <span class="self">self</span>.color_hint, |
| }, |
| phantom: PhantomData, |
| }) |
| } |
| |
| <span class="doccomment">/// View this buffer but keep mutability at a sample level. |
| /// |
| /// This is similar to `as_view` but subtly different from `as_view_mut`. The resulting type |
| /// can be used as a `GenericImage` with the same prior invariants needed as for `as_view`. |
| /// It can not be used as a mutable `GenericImage` but does not need channels to be packed in |
| /// their pixel representation. |
| /// |
| /// This first ensures that all in-bounds coordinates refer to valid indices in the sample |
| /// buffer. It also checks that the specified pixel format expects the same number of channels |
| /// that are present in this buffer. Neither are larger nor a smaller number will be accepted. |
| /// There is no automatic conversion. |
| /// |
| /// **WARNING**: Note that of course samples may alias, so that the mutable reference returned |
| /// for one sample can in fact modify other samples as well. Sometimes exactly this is |
| /// intended. |
| </span><span class="kw">pub fn </span>as_view_with_mut_samples<P>(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><View<<span class="kw-2">&mut </span>[P::Subpixel], P>, Error> |
| <span class="kw">where </span>P: Pixel, Buffer: AsMut<[P::Subpixel]>, |
| { |
| <span class="kw">if </span><span class="self">self</span>.layout.channels != P::CHANNEL_COUNT { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::WrongColor(P::COLOR_TYPE)) |
| } |
| |
| <span class="kw">let </span>as_mut = <span class="self">self</span>.samples.as_mut(); |
| <span class="kw">if </span>!<span class="self">self</span>.layout.fits(as_mut.len()) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::TooLarge) |
| } |
| |
| <span class="prelude-val">Ok</span>(View { |
| inner: FlatSamples { |
| samples: as_mut, |
| layout: <span class="self">self</span>.layout, |
| color_hint: <span class="self">self</span>.color_hint, |
| }, |
| phantom: PhantomData, |
| }) |
| } |
| |
| <span class="doccomment">/// Interpret this buffer as a mutable image. |
| /// |
| /// To succeed, the pixels in this buffer may not alias each other and the samples of each |
| /// pixel must be packed (i.e. `channel_stride` is `1`). The number of channels must be |
| /// consistent with the channel count expected by the pixel format. |
| /// |
| /// This is similar to an `ImageBuffer` except it is a temporary view that is not normalized as |
| /// strongly. To get an owning version, consider copying the data into an `ImageBuffer`. This |
| /// provides many more operations, is possibly faster (if not you may want to open an issue) is |
| /// generally polished. You can also try to convert this buffer inline, see |
| /// `ImageBuffer::from_raw`. |
| </span><span class="kw">pub fn </span>as_view_mut<P>(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><ViewMut<<span class="kw-2">&mut </span>[P::Subpixel], P>, Error> |
| <span class="kw">where </span>P: Pixel, Buffer: AsMut<[P::Subpixel]>, |
| { |
| <span class="kw">if </span>!<span class="self">self</span>.layout.is_normal(NormalForm::PixelPacked) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::NormalFormRequired(NormalForm::PixelPacked)) |
| } |
| |
| <span class="kw">if </span><span class="self">self</span>.layout.channels != P::CHANNEL_COUNT { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::WrongColor(P::COLOR_TYPE)) |
| } |
| |
| <span class="kw">let </span>as_mut = <span class="self">self</span>.samples.as_mut(); |
| <span class="kw">if </span>!<span class="self">self</span>.layout.fits(as_mut.len()) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::TooLarge) |
| } |
| |
| <span class="prelude-val">Ok</span>(ViewMut { |
| inner: FlatSamples { |
| samples: as_mut, |
| layout: <span class="self">self</span>.layout, |
| color_hint: <span class="self">self</span>.color_hint, |
| }, |
| phantom: PhantomData, |
| }) |
| } |
| |
| <span class="doccomment">/// View the samples as a slice. |
| /// |
| /// The slice is not limited to the region of the image and not all sample indices are valid |
| /// indices into this buffer. See `image_mut_slice` as an alternative. |
| </span><span class="kw">pub fn </span>as_slice<T>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[T] <span class="kw">where </span>Buffer: AsRef<[T]> { |
| <span class="self">self</span>.samples.as_ref() |
| } |
| |
| <span class="doccomment">/// View the samples as a slice. |
| /// |
| /// The slice is not limited to the region of the image and not all sample indices are valid |
| /// indices into this buffer. See `image_mut_slice` as an alternative. |
| </span><span class="kw">pub fn </span>as_mut_slice<T>(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[T] <span class="kw">where </span>Buffer: AsMut<[T]> { |
| <span class="self">self</span>.samples.as_mut() |
| } |
| |
| <span class="doccomment">/// Return the portion of the buffer that holds sample values. |
| /// |
| /// This may fail when the coordinates in this image are either out-of-bounds of the underlying |
| /// buffer or can not be represented. Note that the slice may have holes that do not correspond |
| /// to any sample in the image represented by it. |
| </span><span class="kw">pub fn </span>image_slice<T>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[T]> <span class="kw">where </span>Buffer: AsRef<[T]> { |
| <span class="kw">let </span>min_length = <span class="kw">match </span><span class="self">self</span>.min_length() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(index) => index, |
| }; |
| |
| <span class="kw">let </span>slice = <span class="self">self</span>.samples.as_ref(); |
| <span class="kw">if </span>slice.len() < min_length { |
| <span class="kw">return </span><span class="prelude-val">None |
| </span>} |
| |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span>slice[..min_length]) |
| } |
| |
| <span class="doccomment">/// Mutable portion of the buffer that holds sample values. |
| </span><span class="kw">pub fn </span>image_mut_slice<T>(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>[T]> <span class="kw">where </span>Buffer: AsMut<[T]> { |
| <span class="kw">let </span>min_length = <span class="kw">match </span><span class="self">self</span>.min_length() { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(index) => index, |
| }; |
| |
| <span class="kw">let </span>slice = <span class="self">self</span>.samples.as_mut(); |
| <span class="kw">if </span>slice.len() < min_length { |
| <span class="kw">return </span><span class="prelude-val">None |
| </span>} |
| |
| <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>slice[..min_length]) |
| } |
| |
| <span class="doccomment">/// Move the data into an image buffer. |
| /// |
| /// This does **not** convert the sample layout. The buffer needs to be in packed row-major form |
| /// before calling this function. In case of an error, returns the buffer again so that it does |
| /// not release any allocation. |
| </span><span class="kw">pub fn </span>try_into_buffer<P>(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><ImageBuffer<P, Buffer>, (Error, <span class="self">Self</span>)> |
| <span class="kw">where |
| </span>P: Pixel + <span class="lifetime">'static</span>, |
| P::Subpixel: <span class="lifetime">'static</span>, |
| Buffer: Deref<Target=[P::Subpixel]>, |
| { |
| <span class="kw">if </span>!<span class="self">self</span>.is_normal(NormalForm::RowMajorPacked) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>((Error::NormalFormRequired(NormalForm::RowMajorPacked), <span class="self">self</span>)) |
| } |
| |
| <span class="kw">if </span><span class="self">self</span>.layout.channels != P::CHANNEL_COUNT { |
| <span class="kw">return </span><span class="prelude-val">Err</span>((Error::WrongColor(P::COLOR_TYPE), <span class="self">self</span>)) |
| } |
| |
| <span class="kw">if </span>!<span class="self">self</span>.fits(<span class="self">self</span>.samples.deref().len()) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>((Error::TooLarge, <span class="self">self</span>)) |
| } |
| |
| |
| <span class="prelude-val">Ok</span>(ImageBuffer::from_raw(<span class="self">self</span>.layout.width, <span class="self">self</span>.layout.height, <span class="self">self</span>.samples).unwrap_or_else( |
| || <span class="macro">panic!</span>(<span class="string">"Preconditions should have been ensured before conversion"</span>))) |
| } |
| |
| <span class="doccomment">/// Get the minimum length of a buffer such that all in-bounds samples have valid indices. |
| /// |
| /// This method will allow zero strides, allowing compact representations of monochrome images. |
| /// To check that no aliasing occurs, try `check_alias_invariants`. For compact images (no |
| /// aliasing and no unindexed samples) this is `width*height*channels`. But for both of the |
| /// other cases, the reasoning is slightly more involved. |
| /// |
| /// # Explanation |
| /// |
| /// Note that there is a difference between `min_length` and the index of the sample |
| /// 'one-past-the-end`. This is due to strides that may be larger than the dimension below. |
| /// |
| /// ## Example with holes |
| /// |
| /// Let's look at an example of a grayscale image with |
| /// * `width_stride = 1` |
| /// * `width = 2` |
| /// * `height_stride = 3` |
| /// * `height = 2` |
| /// |
| /// ```text |
| /// | x x | x x m | $ |
| /// min_length m ^ |
| /// ^ one-past-the-end $ |
| /// ``` |
| /// |
| /// The difference is also extreme for empty images with large strides. The one-past-the-end |
| /// sample index is still as large as the largest of these strides while `min_length = 0`. |
| /// |
| /// ## Example with aliasing |
| /// |
| /// The concept gets even more important when you allow samples to alias each other. Here we |
| /// have the buffer of a small grayscale image where this is the case, this time we will first |
| /// show the buffer and then the individual rows below. |
| /// |
| /// * `width_stride = 1` |
| /// * `width = 3` |
| /// * `height_stride = 2` |
| /// * `height = 2` |
| /// |
| /// ```text |
| /// 1 2 3 4 5 m |
| /// |1 2 3| row one |
| /// |3 4 5| row two |
| /// ^ m min_length |
| /// ^ ??? one-past-the-end |
| /// ``` |
| /// |
| /// This time 'one-past-the-end' is not even simply the largest stride times the extent of its |
| /// dimension. That still points inside the image because `height*height_stride = 4` but also |
| /// `index_of(1, 2) = 4`. |
| </span><span class="kw">pub fn </span>min_length(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.layout.min_length() |
| } |
| |
| <span class="doccomment">/// Check if a buffer of length `len` is large enough. |
| </span><span class="kw">pub fn </span>fits(<span class="kw-2">&</span><span class="self">self</span>, len: usize) -> bool { |
| <span class="self">self</span>.layout.fits(len) |
| } |
| |
| <span class="doccomment">/// If there are any samples aliasing each other. |
| /// |
| /// If this is not the case, it would always be safe to allow mutable access to two different |
| /// samples at the same time. Otherwise, this operation would need additional checks. When one |
| /// dimension overflows `usize` with its stride we also consider this aliasing. |
| </span><span class="kw">pub fn </span>has_aliased_samples(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.layout.has_aliased_samples() |
| } |
| |
| <span class="doccomment">/// Check if a buffer fulfills the requirements of a normal form. |
| /// |
| /// Certain conversions have preconditions on the structure of the sample buffer that are not |
| /// captured (by design) by the type system. These are then checked before the conversion. Such |
| /// checks can all be done in constant time and will not inspect the buffer content. You can |
| /// perform these checks yourself when the conversion is not required at this moment but maybe |
| /// still performed later. |
| </span><span class="kw">pub fn </span>is_normal(<span class="kw-2">&</span><span class="self">self</span>, form: NormalForm) -> bool { |
| <span class="self">self</span>.layout.is_normal(form) |
| } |
| |
| <span class="doccomment">/// Check that the pixel and the channel index are in bounds. |
| /// |
| /// An in-bound coordinate does not yet guarantee that the corresponding calculation of a |
| /// buffer index does not overflow. However, if such a buffer large enough to hold all samples |
| /// actually exists in memory, this porperty of course follows. |
| </span><span class="kw">pub fn </span>in_bounds(<span class="kw-2">&</span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> bool { |
| <span class="self">self</span>.layout.in_bounds(channel, x, y) |
| } |
| |
| <span class="doccomment">/// Resolve the index of a particular sample. |
| /// |
| /// `None` if the index is outside the bounds or does not fit into a `usize`. |
| </span><span class="kw">pub fn </span>index(<span class="kw-2">&</span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.layout.index(channel, x, y) |
| } |
| |
| <span class="doccomment">/// Get the theoretical position of sample (x, y, channel). |
| /// |
| /// The 'check' is for overflow during index calculation, not that it is contained in the |
| /// image. Two samples may return the same index, even when one of them is out of bounds. This |
| /// happens when all strides are `0`, i.e. the image is an arbitrarily large monochrome image. |
| </span><span class="kw">pub fn </span>index_ignoring_bounds(<span class="kw-2">&</span><span class="self">self</span>, channel: usize, x: usize, y: usize) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.layout.index_ignoring_bounds(channel, x, y) |
| } |
| |
| <span class="doccomment">/// Get an index provided it is inbouds. |
| /// |
| /// Assumes that the image is backed by some sufficiently large buffer. Then computation can |
| /// not overflow as we could represent the maximum coordinate. Since overflow is defined either |
| /// way, this method can not be unsafe. |
| </span><span class="kw">pub fn </span>in_bounds_index(<span class="kw-2">&</span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> usize { |
| <span class="self">self</span>.layout.in_bounds_index(channel, x, y) |
| } |
| |
| <span class="doccomment">/// Shrink the image to the minimum of current and given extents. |
| /// |
| /// This does not modify the strides, so that the resulting sample buffer may have holes |
| /// created by the shrinking operation. Shrinking could also lead to an non-aliasing image when |
| /// samples had aliased each other before. |
| </span><span class="kw">pub fn </span>shrink_to(<span class="kw-2">&mut </span><span class="self">self</span>, channels: u8, width: u32, height: u32) { |
| <span class="self">self</span>.layout.shrink_to(channels, width, height) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'buf</span>, Subpixel> FlatSamples<<span class="kw-2">&</span><span class="lifetime">'buf </span>[Subpixel]> { |
| <span class="doccomment">/// Create a monocolor image from a single pixel. |
| /// |
| /// This can be used as a very cheap source of a `GenericImageView` with an arbitrary number of |
| /// pixels of a single color, without any dynamic allocation. |
| /// |
| /// ## Examples |
| /// |
| /// ``` |
| /// # fn paint_something<T>(_: T) {} |
| /// use image::{flat::FlatSamples, GenericImage, RgbImage, Rgb}; |
| /// |
| /// let background = Rgb([20, 20, 20]); |
| /// let bg = FlatSamples::with_monocolor(&background, 200, 200);; |
| /// |
| /// let mut image = RgbImage::new(200, 200); |
| /// paint_something(&mut image); |
| /// |
| /// // Reset the canvas |
| /// image.copy_from(&bg.as_view().unwrap(), 0, 0); |
| /// ``` |
| </span><span class="kw">pub fn </span>with_monocolor<P>(pixel: <span class="kw-2">&</span><span class="lifetime">'buf </span>P, width: u32, height: u32) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>P: Pixel<Subpixel=Subpixel>, |
| Subpixel: Primitive, |
| { |
| FlatSamples { |
| samples: pixel.channels(), |
| layout: SampleLayout { |
| channels: P::CHANNEL_COUNT, |
| channel_stride: <span class="number">1</span>, |
| width, |
| width_stride: <span class="number">0</span>, |
| height, |
| height_stride: <span class="number">0</span>, |
| }, |
| color_hint: <span class="prelude-val">Some</span>(P::COLOR_TYPE), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A flat buffer that can be used as an image view. |
| /// |
| /// This is a nearly trivial wrapper around a buffer but at least sanitizes by checking the buffer |
| /// length first and constraining the pixel type. |
| /// |
| /// Note that this does not eliminate panics as the `AsRef<[T]>` implementation of `Buffer` may be |
| /// unreliable, i.e. return different buffers at different times. This of course is a non-issue for |
| /// all common collections where the bounds check once must be enough. |
| /// |
| /// # Inner invariants |
| /// |
| /// * For all indices inside bounds, the corresponding index is valid in the buffer |
| /// * `P::channel_count()` agrees with `self.inner.layout.channels` |
| /// |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>View<Buffer, P: Pixel> |
| <span class="kw">where |
| </span>Buffer: AsRef<[P::Subpixel]> |
| { |
| inner: FlatSamples<Buffer>, |
| phantom: PhantomData<P>, |
| } |
| |
| <span class="doccomment">/// A mutable owning version of a flat buffer. |
| /// |
| /// While this wraps a buffer similar to `ImageBuffer`, this is mostly intended as a utility. The |
| /// library endorsed normalized representation is still `ImageBuffer`. Also, the implementation of |
| /// `AsMut<[P::Subpixel]>` must always yield the same buffer. Therefore there is no public way to |
| /// construct this with an owning buffer. |
| /// |
| /// # Inner invariants |
| /// |
| /// * For all indices inside bounds, the corresponding index is valid in the buffer |
| /// * There is no aliasing of samples |
| /// * The samples are packed, i.e. `self.inner.layout.sample_stride == 1` |
| /// * `P::channel_count()` agrees with `self.inner.layout.channels` |
| /// |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>ViewMut<Buffer, P: Pixel> |
| <span class="kw">where |
| </span>Buffer: AsMut<[P::Subpixel]> |
| { |
| inner: FlatSamples<Buffer>, |
| phantom: PhantomData<P>, |
| } |
| |
| <span class="doccomment">/// Denotes invalid flat sample buffers when trying to convert to stricter types. |
| /// |
| /// The biggest use case being `ImageBuffer` which expects closely packed |
| /// samples in a row major matrix representation. But this error type may be |
| /// resused for other import functions. A more versatile user may also try to |
| /// correct the underlying representation depending on the error variant. |
| </span><span class="attribute">#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)] |
| </span><span class="kw">pub enum </span>Error { |
| <span class="doccomment">/// The represented image was too large. |
| /// |
| /// The optional value denotes a possibly accepted maximal bound. |
| </span>TooLarge, |
| |
| <span class="doccomment">/// The represented image can not use this representation. |
| /// |
| /// Has an additional value of the normalized form that would be accepted. |
| </span>NormalFormRequired(NormalForm), |
| |
| <span class="doccomment">/// The color format did not match the channel count. |
| /// |
| /// In some cases you might be able to fix this by lowering the reported pixel count of the |
| /// buffer without touching the strides. |
| /// |
| /// In very special circumstances you *may* do the opposite. This is **VERY** dangerous but not |
| /// directly memory unsafe although that will likely alias pixels. One scenario is when you |
| /// want to construct an `Rgba` image but have only 3 bytes per pixel and for some reason don't |
| /// care about the value of the alpha channel even though you need `Rgba`. |
| </span>WrongColor(ColorType), |
| } |
| |
| <span class="doccomment">/// Different normal forms of buffers. |
| /// |
| /// A normal form is an unaliased buffer with some additional constraints. The `ÌmageBuffer` uses |
| /// row major form with packed samples. |
| </span><span class="attribute">#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)] |
| </span><span class="kw">pub enum </span>NormalForm { |
| <span class="doccomment">/// No pixel aliases another. |
| /// |
| /// Unaliased also guarantees that all index calculations in the image bounds using |
| /// `dim_index*dim_stride` (such as `x*width_stride + y*height_stride`) do not overflow. |
| </span>Unaliased, |
| |
| <span class="doccomment">/// At least pixels are packed. |
| /// |
| /// Images of these types can wrap `[T]`-slices into the standard color types. This is a |
| /// precondition for `GenericImage` which requires by-reference access to pixels. |
| </span>PixelPacked, |
| |
| <span class="doccomment">/// All samples are packed. |
| /// |
| /// This is orthogonal to `PixelPacked`. It requires that there are no holes in the image but |
| /// it is not necessary that the pixel samples themselves are adjacent. An example of this |
| /// behaviour is a planar image layout. |
| </span>ImagePacked, |
| |
| <span class="doccomment">/// The samples are in row-major form and all samples are packed. |
| /// |
| /// In addition to `PixelPacked` and `ImagePacked` this also asserts that the pixel matrix is |
| /// in row-major form. |
| </span>RowMajorPacked, |
| |
| <span class="doccomment">/// The samples are in column-major form and all samples are packed. |
| /// |
| /// In addition to `PixelPacked` and `ImagePacked` this also asserts that the pixel matrix is |
| /// in column-major form. |
| </span>ColumnMajorPacked, |
| } |
| |
| <span class="kw">impl</span><Buffer, P: Pixel> View<Buffer, P> |
| <span class="kw">where |
| </span>Buffer: AsRef<[P::Subpixel]> |
| { |
| <span class="doccomment">/// Take out the sample buffer. |
| /// |
| /// Gives up the normalization invariants on the buffer format. |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> FlatSamples<Buffer> { |
| <span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Get a reference on the inner sample descriptor. |
| /// |
| /// There is no mutable counterpart as modifying the buffer format, including strides and |
| /// lengths, could invalidate the accessibility invariants of the `View`. It is not specified |
| /// if the inner buffer is the same as the buffer of the image from which this view was |
| /// created. It might have been truncated as an optimization. |
| </span><span class="kw">pub fn </span>flat(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>FlatSamples<Buffer> { |
| <span class="kw-2">&</span><span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Get a reference on the inner buffer. |
| /// |
| /// There is no mutable counter part since it is not intended to allow you to reassign the |
| /// buffer or otherwise change its size or properties. |
| </span><span class="kw">pub fn </span>samples(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Buffer { |
| <span class="kw-2">&</span><span class="self">self</span>.inner.samples |
| } |
| |
| <span class="doccomment">/// Get a reference to a selected subpixel if it is in-bounds. |
| /// |
| /// This method will return `None` when the sample is out-of-bounds. All errors that could |
| /// occur due to overflow have been eliminated while construction the `View`. |
| </span><span class="kw">pub fn </span>get_sample(<span class="kw-2">&</span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>P::Subpixel> { |
| <span class="kw">if </span>!<span class="self">self</span>.inner.in_bounds(channel, x, y) { |
| <span class="kw">return </span><span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">let </span>index = <span class="self">self</span>.inner.in_bounds_index(channel, x, y); |
| <span class="comment">// Should always be `Some(_)` but checking is more costly. |
| </span><span class="self">self</span>.samples().as_ref().get(index) |
| } |
| |
| <span class="doccomment">/// Get a mutable reference to a selected subpixel if it is in-bounds. |
| /// |
| /// This is relevant only when constructed with `FlatSamples::as_view_with_mut_samples`. This |
| /// method will return `None` when the sample is out-of-bounds. All errors that could occur due |
| /// to overflow have been eliminated while construction the `View`. |
| /// |
| /// **WARNING**: Note that of course samples may alias, so that the mutable reference returned |
| /// here can in fact modify more than the coordinate in the argument. |
| </span><span class="kw">pub fn </span>get_mut_sample(<span class="kw-2">&mut </span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>P::Subpixel> |
| <span class="kw">where </span>Buffer: AsMut<[P::Subpixel]> |
| { |
| <span class="kw">if </span>!<span class="self">self</span>.inner.in_bounds(channel, x, y) { |
| <span class="kw">return </span><span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">let </span>index = <span class="self">self</span>.inner.in_bounds_index(channel, x, y); |
| <span class="comment">// Should always be `Some(_)` but checking is more costly. |
| </span><span class="self">self</span>.inner.samples.as_mut().get_mut(index) |
| } |
| |
| <span class="doccomment">/// Get the minimum length of a buffer such that all in-bounds samples have valid indices. |
| /// |
| /// See `FlatSamples::min_length`. This method will always succeed. |
| </span><span class="kw">pub fn </span>min_length(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.min_length().unwrap() |
| } |
| |
| <span class="doccomment">/// Return the portion of the buffer that holds sample values. |
| /// |
| /// While this can not fail–the validity of all coordinates has been validated during the |
| /// conversion from `FlatSamples`–the resulting slice may still contain holes. |
| </span><span class="kw">pub fn </span>image_slice(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[P::Subpixel] { |
| <span class="kw-2">&</span><span class="self">self</span>.samples().as_ref()[..<span class="self">self</span>.min_length()] |
| } |
| |
| <span class="doccomment">/// Return the mutable portion of the buffer that holds sample values. |
| /// |
| /// This is relevant only when constructed with `FlatSamples::as_view_with_mut_samples`. While |
| /// this can not fail–the validity of all coordinates has been validated during the conversion |
| /// from `FlatSamples`–the resulting slice may still contain holes. |
| </span><span class="kw">pub fn </span>image_mut_slice(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[P::Subpixel] |
| <span class="kw">where </span>Buffer: AsMut<[P::Subpixel]> |
| { |
| <span class="kw">let </span>min_length = <span class="self">self</span>.min_length(); |
| <span class="kw-2">&mut </span><span class="self">self</span>.inner.samples.as_mut()[..min_length] |
| } |
| |
| <span class="doccomment">/// Shrink the inner image. |
| /// |
| /// The new dimensions will be the minimum of the previous dimensions. Since the set of |
| /// in-bounds pixels afterwards is a subset of the current ones, this is allowed on a `View`. |
| /// Note that you can not change the number of channels as an intrinsic property of `P`. |
| </span><span class="kw">pub fn </span>shrink_to(<span class="kw-2">&mut </span><span class="self">self</span>, width: u32, height: u32) { |
| <span class="kw">let </span>channels = <span class="self">self</span>.inner.layout.channels; |
| <span class="self">self</span>.inner.shrink_to(channels, width, height) |
| } |
| |
| <span class="doccomment">/// Try to convert this into an image with mutable pixels. |
| /// |
| /// The resulting image implements `GenericImage` in addition to `GenericImageView`. While this |
| /// has mutable samples, it does not enforce that pixel can not alias and that samples are |
| /// packed enough for a mutable pixel reference. This is slightly cheaper than the chain |
| /// `self.into_inner().as_view_mut()` and keeps the `View` alive on failure. |
| /// |
| /// ``` |
| /// # use image::RgbImage; |
| /// # use image::Rgb; |
| /// let mut buffer = RgbImage::new(480, 640).into_flat_samples(); |
| /// let view = buffer.as_view_with_mut_samples::<Rgb<u8>>().unwrap(); |
| /// |
| /// // Inspect some pixels, … |
| /// |
| /// // Doesn't fail because it was originally an `RgbImage`. |
| /// let view_mut = view.try_upgrade().unwrap(); |
| /// ``` |
| </span><span class="kw">pub fn </span>try_upgrade(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><ViewMut<Buffer, P>, (Error, <span class="self">Self</span>)> |
| <span class="kw">where </span>Buffer: AsMut<[P::Subpixel]> |
| { |
| <span class="kw">if </span>!<span class="self">self</span>.inner.is_normal(NormalForm::PixelPacked) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>((Error::NormalFormRequired(NormalForm::PixelPacked), <span class="self">self</span>)) |
| } |
| |
| <span class="comment">// No length check or channel count check required, all the same. |
| </span><span class="prelude-val">Ok</span>(ViewMut { |
| inner: <span class="self">self</span>.inner, |
| phantom: PhantomData, |
| }) |
| } |
| } |
| |
| <span class="kw">impl</span><Buffer, P: Pixel> ViewMut<Buffer, P> |
| <span class="kw">where |
| </span>Buffer: AsMut<[P::Subpixel]> |
| { |
| <span class="doccomment">/// Take out the sample buffer. |
| /// |
| /// Gives up the normalization invariants on the buffer format. |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> FlatSamples<Buffer> { |
| <span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Get a reference on the sample buffer descriptor. |
| /// |
| /// There is no mutable counterpart as modifying the buffer format, including strides and |
| /// lengths, could invalidate the accessibility invariants of the `View`. It is not specified |
| /// if the inner buffer is the same as the buffer of the image from which this view was |
| /// created. It might have been truncated as an optimization. |
| </span><span class="kw">pub fn </span>flat(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>FlatSamples<Buffer> { |
| <span class="kw-2">&</span><span class="self">self</span>.inner |
| } |
| |
| <span class="doccomment">/// Get a reference on the inner buffer. |
| /// |
| /// There is no mutable counter part since it is not intended to allow you to reassign the |
| /// buffer or otherwise change its size or properties. However, its contents can be accessed |
| /// mutable through a slice with `image_mut_slice`. |
| </span><span class="kw">pub fn </span>samples(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Buffer { |
| <span class="kw-2">&</span><span class="self">self</span>.inner.samples |
| } |
| |
| <span class="doccomment">/// Get the minimum length of a buffer such that all in-bounds samples have valid indices. |
| /// |
| /// See `FlatSamples::min_length`. This method will always succeed. |
| </span><span class="kw">pub fn </span>min_length(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.min_length().unwrap() |
| } |
| |
| <span class="doccomment">/// Get a reference to a selected subpixel. |
| /// |
| /// This method will return `None` when the sample is out-of-bounds. All errors that could |
| /// occur due to overflow have been eliminated while construction the `View`. |
| </span><span class="kw">pub fn </span>get_sample(<span class="kw-2">&</span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>P::Subpixel> |
| <span class="kw">where </span>Buffer: AsRef<[P::Subpixel]> |
| { |
| <span class="kw">if </span>!<span class="self">self</span>.inner.in_bounds(channel, x, y) { |
| <span class="kw">return </span><span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">let </span>index = <span class="self">self</span>.inner.in_bounds_index(channel, x, y); |
| <span class="comment">// Should always be `Some(_)` but checking is more costly. |
| </span><span class="self">self</span>.samples().as_ref().get(index) |
| } |
| |
| <span class="doccomment">/// Get a mutable reference to a selected sample. |
| /// |
| /// This method will return `None` when the sample is out-of-bounds. All errors that could |
| /// occur due to overflow have been eliminated while construction the `View`. |
| </span><span class="kw">pub fn </span>get_mut_sample(<span class="kw-2">&mut </span><span class="self">self</span>, channel: u8, x: u32, y: u32) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>P::Subpixel> { |
| <span class="kw">if </span>!<span class="self">self</span>.inner.in_bounds(channel, x, y) { |
| <span class="kw">return </span><span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">let </span>index = <span class="self">self</span>.inner.in_bounds_index(channel, x, y); |
| <span class="comment">// Should always be `Some(_)` but checking is more costly. |
| </span><span class="self">self</span>.inner.samples.as_mut().get_mut(index) |
| } |
| |
| <span class="doccomment">/// Return the portion of the buffer that holds sample values. |
| /// |
| /// While this can not fail–the validity of all coordinates has been validated during the |
| /// conversion from `FlatSamples`–the resulting slice may still contain holes. |
| </span><span class="kw">pub fn </span>image_slice(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[P::Subpixel] <span class="kw">where </span>Buffer: AsRef<[P::Subpixel]> { |
| <span class="kw-2">&</span><span class="self">self</span>.inner.samples.as_ref()[..<span class="self">self</span>.min_length()] |
| } |
| |
| <span class="doccomment">/// Return the mutable buffer that holds sample values. |
| </span><span class="kw">pub fn </span>image_mut_slice(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[P::Subpixel] { |
| <span class="kw">let </span>length = <span class="self">self</span>.min_length(); |
| <span class="kw-2">&mut </span><span class="self">self</span>.inner.samples.as_mut()[..length] |
| } |
| |
| <span class="doccomment">/// Shrink the inner image. |
| /// |
| /// The new dimensions will be the minimum of the previous dimensions. Since the set of |
| /// in-bounds pixels afterwards is a subset of the current ones, this is allowed on a `View`. |
| /// Note that you can not change the number of channels as an intrinsic property of `P`. |
| </span><span class="kw">pub fn </span>shrink_to(<span class="kw-2">&mut </span><span class="self">self</span>, width: u32, height: u32) { |
| <span class="kw">let </span>channels = <span class="self">self</span>.inner.layout.channels; |
| <span class="self">self</span>.inner.shrink_to(channels, width, height) |
| } |
| } |
| |
| |
| <span class="comment">// The out-of-bounds panic for single sample access similar to `slice::index`. |
| </span><span class="attribute">#[inline(never)] |
| #[cold] |
| </span><span class="kw">fn </span>panic_cwh_out_of_bounds( |
| (c, x, y): (u8, u32, u32), |
| bounds: (u8, u32, u32), |
| strides: (usize, usize, usize)) -> ! |
| { |
| <span class="macro">panic!</span>(<span class="string">"Sample coordinates {:?} out of sample matrix bounds {:?} with strides {:?}"</span>, (c, x, y), bounds, strides) |
| } |
| |
| <span class="comment">// The out-of-bounds panic for pixel access similar to `slice::index`. |
| </span><span class="attribute">#[inline(never)] |
| #[cold] |
| </span><span class="kw">fn </span>panic_pixel_out_of_bounds( |
| (x, y): (u32, u32), |
| bounds: (u32, u32)) -> ! |
| { |
| <span class="macro">panic!</span>(<span class="string">"Image index {:?} out of bounds {:?}"</span>, (x, y), bounds) |
| } |
| |
| <span class="kw">impl</span><Buffer> Index<(u8, u32, u32)> <span class="kw">for </span>FlatSamples<Buffer> |
| <span class="kw">where </span>Buffer: Index<usize> |
| { |
| <span class="kw">type </span>Output = Buffer::Output; |
| |
| <span class="doccomment">/// Return a reference to a single sample at specified coordinates. |
| /// |
| /// # Panics |
| /// |
| /// When the coordinates are out of bounds or the index calculation fails. |
| </span><span class="kw">fn </span>index(<span class="kw-2">&</span><span class="self">self</span>, (c, x, y): (u8, u32, u32)) -> <span class="kw-2">&</span><span class="self">Self</span>::Output { |
| <span class="kw">let </span>bounds = <span class="self">self</span>.bounds(); |
| <span class="kw">let </span>strides = <span class="self">self</span>.strides_cwh(); |
| <span class="kw">let </span>index = <span class="self">self</span>.index(c, x, y).unwrap_or_else(|| |
| panic_cwh_out_of_bounds((c, x, y), bounds, strides)); |
| <span class="kw-2">&</span><span class="self">self</span>.samples[index] |
| } |
| } |
| |
| <span class="kw">impl</span><Buffer> IndexMut<(u8, u32, u32)> <span class="kw">for </span>FlatSamples<Buffer> |
| <span class="kw">where </span>Buffer: IndexMut<usize> |
| { |
| |
| <span class="doccomment">/// Return a mutable reference to a single sample at specified coordinates. |
| /// |
| /// # Panics |
| /// |
| /// When the coordinates are out of bounds or the index calculation fails. |
| </span><span class="kw">fn </span>index_mut(<span class="kw-2">&mut </span><span class="self">self</span>, (c, x, y): (u8, u32, u32)) -> <span class="kw-2">&mut </span><span class="self">Self</span>::Output { |
| <span class="kw">let </span>bounds = <span class="self">self</span>.bounds(); |
| <span class="kw">let </span>strides = <span class="self">self</span>.strides_cwh(); |
| <span class="kw">let </span>index = <span class="self">self</span>.index(c, x, y).unwrap_or_else(|| |
| panic_cwh_out_of_bounds((c, x, y), bounds, strides)); |
| <span class="kw-2">&mut </span><span class="self">self</span>.samples[index] |
| } |
| } |
| |
| <span class="kw">impl</span><Buffer, P: Pixel> GenericImageView <span class="kw">for </span>View<Buffer, P> |
| <span class="kw">where </span>Buffer: AsRef<[P::Subpixel]> |
| { |
| <span class="kw">type </span>Pixel = P; |
| |
| <span class="comment">// We don't proxy an inner image. |
| </span><span class="kw">type </span>InnerImageView = <span class="self">Self</span>; |
| |
| <span class="kw">fn </span>dimensions(<span class="kw-2">&</span><span class="self">self</span>) -> (u32, u32) { |
| (<span class="self">self</span>.inner.layout.width, <span class="self">self</span>.inner.layout.height) |
| } |
| |
| <span class="kw">fn </span>bounds(<span class="kw-2">&</span><span class="self">self</span>) -> (u32, u32, u32, u32) { |
| <span class="kw">let </span>(w, h) = <span class="self">self</span>.dimensions(); |
| (<span class="number">0</span>, w, <span class="number">0</span>, h) |
| } |
| |
| <span class="kw">fn </span>in_bounds(<span class="kw-2">&</span><span class="self">self</span>, x: u32, y: u32) -> bool { |
| <span class="kw">let </span>(w, h) = <span class="self">self</span>.dimensions(); |
| x < w && y < h |
| } |
| |
| <span class="kw">fn </span>get_pixel(<span class="kw-2">&</span><span class="self">self</span>, x: u32, y: u32) -> <span class="self">Self</span>::Pixel { |
| <span class="kw">if </span>!<span class="self">self</span>.inner.in_bounds(<span class="number">0</span>, x, y) { |
| panic_pixel_out_of_bounds((x, y), <span class="self">self</span>.dimensions()) |
| } |
| |
| <span class="kw">let </span>image = <span class="self">self</span>.inner.samples.as_ref(); |
| <span class="kw">let </span>base_index = <span class="self">self</span>.inner.in_bounds_index(<span class="number">0</span>, x, y); |
| <span class="kw">let </span>channels = P::CHANNEL_COUNT <span class="kw">as </span>usize; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buffer = [Zero::zero(); <span class="number">256</span>]; |
| buffer.iter_mut().enumerate().take(channels).for_each(|(c, to)| { |
| <span class="kw">let </span>index = base_index + c<span class="kw-2">*</span><span class="self">self</span>.inner.layout.channel_stride; |
| <span class="kw-2">*</span>to = image[index]; |
| }); |
| |
| <span class="kw-2">*</span>P::from_slice(<span class="kw-2">&</span>buffer[..channels]) |
| } |
| |
| <span class="kw">fn </span>inner(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="self">Self </span>{ |
| <span class="self">self </span><span class="comment">// There is no other inner image. |
| </span>} |
| } |
| |
| <span class="kw">impl</span><Buffer, P: Pixel> GenericImageView <span class="kw">for </span>ViewMut<Buffer, P> |
| <span class="kw">where </span>Buffer: AsMut<[P::Subpixel]> + AsRef<[P::Subpixel]>, |
| { |
| <span class="kw">type </span>Pixel = P; |
| |
| <span class="comment">// We don't proxy an inner image. |
| </span><span class="kw">type </span>InnerImageView = <span class="self">Self</span>; |
| |
| <span class="kw">fn </span>dimensions(<span class="kw-2">&</span><span class="self">self</span>) -> (u32, u32) { |
| (<span class="self">self</span>.inner.layout.width, <span class="self">self</span>.inner.layout.height) |
| } |
| |
| <span class="kw">fn </span>bounds(<span class="kw-2">&</span><span class="self">self</span>) -> (u32, u32, u32, u32) { |
| <span class="kw">let </span>(w, h) = <span class="self">self</span>.dimensions(); |
| (<span class="number">0</span>, w, <span class="number">0</span>, h) |
| } |
| |
| <span class="kw">fn </span>in_bounds(<span class="kw-2">&</span><span class="self">self</span>, x: u32, y: u32) -> bool { |
| <span class="kw">let </span>(w, h) = <span class="self">self</span>.dimensions(); |
| x < w && y < h |
| } |
| |
| <span class="kw">fn </span>get_pixel(<span class="kw-2">&</span><span class="self">self</span>, x: u32, y: u32) -> <span class="self">Self</span>::Pixel { |
| <span class="kw">if </span>!<span class="self">self</span>.inner.in_bounds(<span class="number">0</span>, x, y) { |
| panic_pixel_out_of_bounds((x, y), <span class="self">self</span>.dimensions()) |
| } |
| |
| <span class="kw">let </span>image = <span class="self">self</span>.inner.samples.as_ref(); |
| <span class="kw">let </span>base_index = <span class="self">self</span>.inner.in_bounds_index(<span class="number">0</span>, x, y); |
| <span class="kw">let </span>channels = P::CHANNEL_COUNT <span class="kw">as </span>usize; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buffer = [Zero::zero(); <span class="number">256</span>]; |
| buffer.iter_mut().enumerate().take(channels).for_each(|(c, to)| { |
| <span class="kw">let </span>index = base_index + c<span class="kw-2">*</span><span class="self">self</span>.inner.layout.channel_stride; |
| <span class="kw-2">*</span>to = image[index]; |
| }); |
| |
| <span class="kw-2">*</span>P::from_slice(<span class="kw-2">&</span>buffer[..channels]) |
| } |
| |
| <span class="kw">fn </span>inner(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="self">Self </span>{ |
| <span class="self">self </span><span class="comment">// There is no other inner image. |
| </span>} |
| } |
| |
| <span class="kw">impl</span><Buffer, P: Pixel> GenericImage <span class="kw">for </span>ViewMut<Buffer, P> |
| <span class="kw">where </span>Buffer: AsMut<[P::Subpixel]> + AsRef<[P::Subpixel]>, |
| { |
| <span class="kw">type </span>InnerImage = <span class="self">Self</span>; |
| |
| <span class="kw">fn </span>get_pixel_mut(<span class="kw-2">&mut </span><span class="self">self</span>, x: u32, y: u32) -> <span class="kw-2">&mut </span><span class="self">Self</span>::Pixel { |
| <span class="kw">if </span>!<span class="self">self</span>.inner.in_bounds(<span class="number">0</span>, x, y) { |
| panic_pixel_out_of_bounds((x, y), <span class="self">self</span>.dimensions()) |
| } |
| |
| <span class="kw">let </span>base_index = <span class="self">self</span>.inner.in_bounds_index(<span class="number">0</span>, x, y); |
| <span class="kw">let </span>channel_count = <P <span class="kw">as </span>Pixel>::CHANNEL_COUNT <span class="kw">as </span>usize; |
| <span class="kw">let </span>pixel_range = base_index..base_index + channel_count; |
| P::from_slice_mut(<span class="kw-2">&mut </span><span class="self">self</span>.inner.samples.as_mut()[pixel_range]) |
| } |
| |
| <span class="kw">fn </span>put_pixel(<span class="kw-2">&mut </span><span class="self">self</span>, x: u32, y: u32, pixel: <span class="self">Self</span>::Pixel) { |
| <span class="kw-2">*</span><span class="self">self</span>.get_pixel_mut(x, y) = pixel; |
| } |
| |
| <span class="kw">fn </span>blend_pixel(<span class="kw-2">&mut </span><span class="self">self</span>, x: u32, y: u32, pixel: <span class="self">Self</span>::Pixel) { |
| <span class="self">self</span>.get_pixel_mut(x, y).blend(<span class="kw-2">&</span>pixel); |
| } |
| |
| <span class="kw">fn </span>inner_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ |
| <span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">impl </span>From<Error> <span class="kw">for </span>ImageError { |
| <span class="kw">fn </span>from(error: Error) -> ImageError { |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>NormalFormRequiredError(NormalForm); |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>NormalFormRequiredError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="macro">write!</span>(f, <span class="string">"Required sample buffer in normal form {:?}"</span>, <span class="self">self</span>.<span class="number">0</span>) |
| } |
| } |
| <span class="kw">impl </span>error::Error <span class="kw">for </span>NormalFormRequiredError {} |
| |
| <span class="kw">match </span>error { |
| Error::TooLarge => ImageError::Parameter(ParameterError::from_kind(ParameterErrorKind::DimensionMismatch)), |
| Error::NormalFormRequired(form) => ImageError::Decoding(DecodingError::new( |
| ImageFormatHint::Unknown, |
| NormalFormRequiredError(form))), |
| Error::WrongColor(color) => ImageError::Unsupported(UnsupportedError::from_format_and_kind( |
| ImageFormatHint::Unknown, |
| UnsupportedErrorKind::Color(color.into()))), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Error { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Error::TooLarge => <span class="macro">write!</span>(f, <span class="string">"The layout is too large"</span>), |
| Error::NormalFormRequired(form) => <span class="macro">write!</span>( |
| f, |
| <span class="string">"The layout needs to {}"</span>, |
| <span class="kw">match </span>form { |
| NormalForm::ColumnMajorPacked => <span class="string">"be packed and in column major form"</span>, |
| NormalForm::ImagePacked => <span class="string">"be fully packed"</span>, |
| NormalForm::PixelPacked => <span class="string">"have packed pixels"</span>, |
| NormalForm::RowMajorPacked => <span class="string">"be packed and in row major form"</span>, |
| NormalForm::Unaliased => <span class="string">"not have any aliasing channels"</span>, |
| } |
| ), |
| Error::WrongColor(color) => <span class="macro">write!</span>( |
| f, |
| <span class="string">"The chosen color type does not match the hint {:?}"</span>, |
| color |
| ), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>error::Error <span class="kw">for </span>Error {} |
| |
| <span class="kw">impl </span>PartialOrd <span class="kw">for </span>NormalForm { |
| <span class="doccomment">/// Compares the logical preconditions. |
| /// |
| /// `a < b` if the normal form `a` has less preconditions than `b`. |
| </span><span class="kw">fn </span>partial_cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> <span class="prelude-ty">Option</span><cmp::Ordering> { |
| <span class="kw">match </span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">*</span>other) { |
| (NormalForm::Unaliased, NormalForm::Unaliased) => <span class="prelude-val">Some</span>(cmp::Ordering::Equal), |
| (NormalForm::PixelPacked, NormalForm::PixelPacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Equal), |
| (NormalForm::ImagePacked, NormalForm::ImagePacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Equal), |
| (NormalForm::RowMajorPacked, NormalForm::RowMajorPacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Equal), |
| (NormalForm::ColumnMajorPacked, NormalForm::ColumnMajorPacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Equal), |
| |
| (NormalForm::Unaliased, <span class="kw">_</span>) => <span class="prelude-val">Some</span>(cmp::Ordering::Less), |
| (<span class="kw">_</span>, NormalForm::Unaliased) => <span class="prelude-val">Some</span>(cmp::Ordering::Greater), |
| |
| (NormalForm::PixelPacked, NormalForm::ColumnMajorPacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Less), |
| (NormalForm::PixelPacked, NormalForm::RowMajorPacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Less), |
| (NormalForm::RowMajorPacked, NormalForm::PixelPacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Greater), |
| (NormalForm::ColumnMajorPacked, NormalForm::PixelPacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Greater), |
| |
| (NormalForm::ImagePacked, NormalForm::ColumnMajorPacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Less), |
| (NormalForm::ImagePacked, NormalForm::RowMajorPacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Less), |
| (NormalForm::RowMajorPacked, NormalForm::ImagePacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Greater), |
| (NormalForm::ColumnMajorPacked, NormalForm::ImagePacked) => <span class="prelude-val">Some</span>(cmp::Ordering::Greater), |
| |
| (NormalForm::ImagePacked, NormalForm::PixelPacked) => <span class="prelude-val">None</span>, |
| (NormalForm::PixelPacked, NormalForm::ImagePacked) => <span class="prelude-val">None</span>, |
| (NormalForm::RowMajorPacked, NormalForm::ColumnMajorPacked) => <span class="prelude-val">None</span>, |
| (NormalForm::ColumnMajorPacked, NormalForm::RowMajorPacked) => <span class="prelude-val">None</span>, |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::buffer_::GrayAlphaImage; |
| <span class="kw">use </span><span class="kw">crate</span>::color::{LumaA, Rgb}; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>aliasing_view() { |
| <span class="kw">let </span>buffer = FlatSamples { |
| samples: <span class="kw-2">&</span>[<span class="number">42</span>], |
| layout: SampleLayout { |
| channels: <span class="number">3</span>, |
| channel_stride: <span class="number">0</span>, |
| width: <span class="number">100</span>, |
| width_stride: <span class="number">0</span>, |
| height: <span class="number">100</span>, |
| height_stride: <span class="number">0</span>, |
| }, |
| color_hint: <span class="prelude-val">None</span>, |
| }; |
| |
| <span class="kw">let </span>view = buffer.as_view::<Rgb<usize>>() |
| .expect(<span class="string">"This is a valid view"</span>); |
| <span class="kw">let </span>pixel_count = view.pixels() |
| .inspect(|pixel| <span class="macro">assert!</span>(pixel.<span class="number">2 </span>== Rgb([<span class="number">42</span>, <span class="number">42</span>, <span class="number">42</span>]))) |
| .count(); |
| <span class="macro">assert_eq!</span>(pixel_count, <span class="number">100</span><span class="kw-2">*</span><span class="number">100</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>mutable_view() { |
| <span class="kw">let </span><span class="kw-2">mut </span>buffer = FlatSamples { |
| samples: [<span class="number">0</span>; <span class="number">18</span>], |
| layout: SampleLayout { |
| channels: <span class="number">2</span>, |
| channel_stride: <span class="number">1</span>, |
| width: <span class="number">3</span>, |
| width_stride: <span class="number">2</span>, |
| height: <span class="number">3</span>, |
| height_stride: <span class="number">6</span>, |
| }, |
| color_hint: <span class="prelude-val">None</span>, |
| }; |
| |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>view = buffer.as_view_mut::<LumaA<usize>>() |
| .expect(<span class="string">"This should be a valid mutable buffer"</span>); |
| <span class="macro">assert_eq!</span>(view.dimensions(), (<span class="number">3</span>, <span class="number">3</span>)); |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">9 </span>{ |
| <span class="kw-2">*</span>view.get_pixel_mut(i % <span class="number">3</span>, i / <span class="number">3</span>) = LumaA([<span class="number">2 </span>* i <span class="kw">as </span>usize, <span class="number">2 </span>* i <span class="kw">as </span>usize + <span class="number">1</span>]); |
| } |
| } |
| |
| buffer.samples.iter() |
| .enumerate() |
| .for_each(|(idx, sample)| <span class="macro">assert_eq!</span>(idx, <span class="kw-2">*</span>sample)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>normal_forms() { |
| <span class="macro">assert!</span>(FlatSamples { |
| samples: [<span class="number">0u8</span>; <span class="number">0</span>], |
| layout: SampleLayout { |
| channels: <span class="number">2</span>, |
| channel_stride: <span class="number">1</span>, |
| width: <span class="number">3</span>, |
| width_stride: <span class="number">9</span>, |
| height: <span class="number">3</span>, |
| height_stride: <span class="number">28</span>, |
| }, |
| color_hint: <span class="prelude-val">None</span>, |
| }.is_normal(NormalForm::PixelPacked)); |
| |
| <span class="macro">assert!</span>(FlatSamples { |
| samples: [<span class="number">0u8</span>; <span class="number">0</span>], |
| layout: SampleLayout { |
| channels: <span class="number">2</span>, |
| channel_stride: <span class="number">8</span>, |
| width: <span class="number">4</span>, |
| width_stride: <span class="number">1</span>, |
| height: <span class="number">2</span>, |
| height_stride: <span class="number">4</span>, |
| }, |
| color_hint: <span class="prelude-val">None</span>, |
| }.is_normal(NormalForm::ImagePacked)); |
| |
| <span class="macro">assert!</span>(FlatSamples { |
| samples: [<span class="number">0u8</span>; <span class="number">0</span>], |
| layout: SampleLayout { |
| channels: <span class="number">2</span>, |
| channel_stride: <span class="number">1</span>, |
| width: <span class="number">4</span>, |
| width_stride: <span class="number">2</span>, |
| height: <span class="number">2</span>, |
| height_stride: <span class="number">8</span>, |
| }, |
| color_hint: <span class="prelude-val">None</span>, |
| }.is_normal(NormalForm::RowMajorPacked)); |
| |
| <span class="macro">assert!</span>(FlatSamples { |
| samples: [<span class="number">0u8</span>; <span class="number">0</span>], |
| layout: SampleLayout { |
| channels: <span class="number">2</span>, |
| channel_stride: <span class="number">1</span>, |
| width: <span class="number">4</span>, |
| width_stride: <span class="number">4</span>, |
| height: <span class="number">2</span>, |
| height_stride: <span class="number">2</span>, |
| }, |
| color_hint: <span class="prelude-val">None</span>, |
| }.is_normal(NormalForm::ColumnMajorPacked)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>image_buffer_conversion() { |
| <span class="kw">let </span>expected_layout = SampleLayout { |
| channels: <span class="number">2</span>, |
| channel_stride: <span class="number">1</span>, |
| width: <span class="number">4</span>, |
| width_stride: <span class="number">2</span>, |
| height: <span class="number">2</span>, |
| height_stride: <span class="number">8</span>, |
| }; |
| |
| <span class="kw">let </span>initial = GrayAlphaImage::new(expected_layout.width, expected_layout.height); |
| <span class="kw">let </span>buffer = initial.into_flat_samples(); |
| |
| <span class="macro">assert_eq!</span>(buffer.layout, expected_layout); |
| |
| <span class="kw">let _</span>: GrayAlphaImage = buffer.try_into_buffer().unwrap_or_else(|(error, <span class="kw">_</span>)| |
| <span class="macro">panic!</span>(<span class="string">"Expected buffer to be convertible but {:?}"</span>, error)); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="image" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |