<!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 to the Rust file `/home/mrh/.cargo/registry/src/github.com-1ecc6299db9ec823/image-0.21.2/./src/dynimage.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>dynimage.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../image/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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<span id="1036">1036</span>
</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">num_iter</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">BufRead</span>, <span class="ident">BufReader</span>, <span class="ident">BufWriter</span>, <span class="ident">Seek</span>, <span class="ident">Write</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">path</span>::<span class="ident">Path</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"bmp"</span>)]</span>
<span class="kw">use</span> <span class="ident">bmp</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"gif_codec"</span>)]</span>
<span class="kw">use</span> <span class="ident">gif</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"hdr"</span>)]</span>
<span class="kw">use</span> <span class="ident">hdr</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ico"</span>)]</span>
<span class="kw">use</span> <span class="ident">ico</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"jpeg"</span>)]</span>
<span class="kw">use</span> <span class="ident">jpeg</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"png_codec"</span>)]</span>
<span class="kw">use</span> <span class="ident">png</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"pnm"</span>)]</span>
<span class="kw">use</span> <span class="ident">pnm</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"tga"</span>)]</span>
<span class="kw">use</span> <span class="ident">tga</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"tiff"</span>)]</span>
<span class="kw">use</span> <span class="ident">tiff</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"webp"</span>)]</span>
<span class="kw">use</span> <span class="ident">webp</span>;
<span class="kw">use</span> <span class="ident">buffer</span>::{<span class="ident">ConvertBuffer</span>, <span class="ident">GrayAlphaImage</span>, <span class="ident">GrayImage</span>, <span class="ident">ImageBuffer</span>, <span class="ident">Pixel</span>, <span class="ident">RgbImage</span>, <span class="ident">RgbaImage</span>, <span class="ident">BgrImage</span>, <span class="ident">BgraImage</span>};
<span class="kw">use</span> <span class="ident">flat</span>::<span class="ident">FlatSamples</span>;
<span class="kw">use</span> <span class="ident">color</span>;
<span class="kw">use</span> <span class="ident">image</span>;
<span class="kw">use</span> <span class="ident">image</span>::{<span class="ident">GenericImage</span>, <span class="ident">GenericImageView</span>, <span class="ident">ImageDecoder</span>, <span class="ident">ImageFormat</span>, <span class="ident">ImageOutputFormat</span>,
<span class="ident">ImageResult</span>};
<span class="kw">use</span> <span class="ident">imageops</span>;
<span class="doccomment">/// A Dynamic Image</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">DynamicImage</span> {
<span class="doccomment">/// Each pixel in this image is 8-bit Luma</span>
<span class="ident">ImageLuma8</span>(<span class="ident">GrayImage</span>),
<span class="doccomment">/// Each pixel in this image is 8-bit Luma with alpha</span>
<span class="ident">ImageLumaA8</span>(<span class="ident">GrayAlphaImage</span>),
<span class="doccomment">/// Each pixel in this image is 8-bit Rgb</span>
<span class="ident">ImageRgb8</span>(<span class="ident">RgbImage</span>),
<span class="doccomment">/// Each pixel in this image is 8-bit Rgb with alpha</span>
<span class="ident">ImageRgba8</span>(<span class="ident">RgbaImage</span>),
<span class="doccomment">/// Each pixel in this image is 8-bit Bgr</span>
<span class="ident">ImageBgr8</span>(<span class="ident">BgrImage</span>),
<span class="doccomment">/// Each pixel in this image is 8-bit Bgr with alpha</span>
<span class="ident">ImageBgra8</span>(<span class="ident">BgraImage</span>),
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">dynamic_map</span>(
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">dynimage</span>: <span class="ident">expr</span>, <span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>: <span class="ident">ident</span> <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>: <span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (
<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">dynimage</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
}
);
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">dynimage</span>: <span class="ident">expr</span>, <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>: <span class="ident">ident</span> <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>: <span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (
<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">dynimage</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>),
}
);
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">dynimage</span>: <span class="ident">expr</span>, <span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>: <span class="ident">ident</span> <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>: <span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (
<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">dynimage</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
}
);
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">dynimage</span>: <span class="ident">expr</span>, <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>: <span class="ident">ident</span> <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>: <span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> (
<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">dynimage</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">image</span>) <span class="op">=</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">action</span>,
}
);
);
<span class="kw">impl</span> <span class="ident">DynamicImage</span> {
<span class="doccomment">/// Creates a dynamic image backed by a buffer of grey pixels.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_luma8</span>(<span class="ident">w</span>: <span class="ident">u32</span>, <span class="ident">h</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="ident">ImageBuffer</span>::<span class="ident">new</span>(<span class="ident">w</span>, <span class="ident">h</span>))
}
<span class="doccomment">/// Creates a dynamic image backed by a buffer of grey</span>
<span class="doccomment">/// pixels with transparency.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_luma_a8</span>(<span class="ident">w</span>: <span class="ident">u32</span>, <span class="ident">h</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="ident">ImageBuffer</span>::<span class="ident">new</span>(<span class="ident">w</span>, <span class="ident">h</span>))
}
<span class="doccomment">/// Creates a dynamic image backed by a buffer of RGB pixels.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_rgb8</span>(<span class="ident">w</span>: <span class="ident">u32</span>, <span class="ident">h</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="ident">ImageBuffer</span>::<span class="ident">new</span>(<span class="ident">w</span>, <span class="ident">h</span>))
}
<span class="doccomment">/// Creates a dynamic image backed by a buffer of RGBA pixels.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_rgba8</span>(<span class="ident">w</span>: <span class="ident">u32</span>, <span class="ident">h</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="ident">ImageBuffer</span>::<span class="ident">new</span>(<span class="ident">w</span>, <span class="ident">h</span>))
}
<span class="doccomment">/// Creates a dynamic image backed by a buffer of BGRA pixels.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_bgra8</span>(<span class="ident">w</span>: <span class="ident">u32</span>, <span class="ident">h</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="ident">ImageBuffer</span>::<span class="ident">new</span>(<span class="ident">w</span>, <span class="ident">h</span>))
}
<span class="doccomment">/// Creates a dynamic image backed by a buffer of BGR pixels.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_bgr8</span>(<span class="ident">w</span>: <span class="ident">u32</span>, <span class="ident">h</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="ident">ImageBuffer</span>::<span class="ident">new</span>(<span class="ident">w</span>, <span class="ident">h</span>))
}
<span class="doccomment">/// Returns a copy of this image as an RGB image.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_rgb</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RgbImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> {
<span class="ident">p</span>.<span class="ident">convert</span>()
})
}
<span class="doccomment">/// Returns a copy of this image as an RGBA image.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_rgba</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RgbaImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> {
<span class="ident">p</span>.<span class="ident">convert</span>()
})
}
<span class="doccomment">/// Returns a copy of this image as an BGR image.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_bgr</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">BgrImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> {
<span class="ident">p</span>.<span class="ident">convert</span>()
})
}
<span class="doccomment">/// Returns a copy of this image as an BGRA image.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_bgra</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">BgraImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> {
<span class="ident">p</span>.<span class="ident">convert</span>()
})
}
<span class="doccomment">/// Returns a copy of this image as a Luma image.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_luma</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">GrayImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> {
<span class="ident">p</span>.<span class="ident">convert</span>()
})
}
<span class="doccomment">/// Returns a copy of this image as a LumaA image.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_luma_alpha</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">GrayAlphaImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> {
<span class="ident">p</span>.<span class="ident">convert</span>()
})
}
<span class="doccomment">/// Return a cut out of this image delimited by the bounding rectangle.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">crop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">x</span>: <span class="ident">u32</span>, <span class="ident">y</span>: <span class="ident">u32</span>, <span class="ident">width</span>: <span class="ident">u32</span>, <span class="ident">height</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">crop</span>(<span class="ident">p</span>, <span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">width</span>, <span class="ident">height</span>).<span class="ident">to_image</span>())
}
<span class="doccomment">/// Return a reference to an 8bit RGB image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_rgb8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">RgbImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a mutable reference to an 8bit RGB image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_mut_rgb8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">RgbImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a reference to an 8bit BGR image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_bgr8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">BgrImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a mutable reference to an 8bit BGR image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_mut_bgr8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">BgrImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a reference to an 8bit RGBA image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_rgba8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">RgbaImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a mutable reference to an 8bit RGBA image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_mut_rgba8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">RgbaImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a reference to an 8bit BGRA image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_bgra8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">BgraImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a mutable reference to an 8bit RGBA image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_mut_bgra8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">BgraImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a reference to an 8bit Grayscale image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_luma8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">GrayImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a mutable reference to an 8bit Grayscale image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_mut_luma8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">GrayImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a reference to an 8bit Grayscale image with an alpha channel</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_luma_alpha8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">GrayAlphaImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return a mutable reference to an 8bit Grayscale image with an alpha channel</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_mut_luma_alpha8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">GrayAlphaImage</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">p</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Return this image's pixels as a byte vector.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">raw_pixels</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="ident">image_to_bytes</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Return a view on the raw sample buffer.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_flat_samples</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">FlatSamples</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">u8</span>]<span class="op">></span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">as_flat_samples</span>())
}
<span class="doccomment">/// Return this image's color type.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">color</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">color</span>::<span class="ident">ColorType</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">8</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">GrayA</span>(<span class="number">8</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">RGB</span>(<span class="number">8</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">RGBA</span>(<span class="number">8</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">BGRA</span>(<span class="number">8</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">BGR</span>(<span class="number">8</span>),
}
}
<span class="doccomment">/// Return a grayscale version of this image.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">grayscale</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="ident">p</span>.<span class="ident">clone</span>()),
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="ident">imageops</span>::<span class="ident">grayscale</span>(<span class="ident">p</span>)),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="ident">imageops</span>::<span class="ident">grayscale</span>(<span class="ident">p</span>)),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="ident">imageops</span>::<span class="ident">grayscale</span>(<span class="ident">p</span>)),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="ident">imageops</span>::<span class="ident">grayscale</span>(<span class="ident">p</span>)),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="ident">imageops</span>::<span class="ident">grayscale</span>(<span class="ident">p</span>)),
}
}
<span class="doccomment">/// Invert the colors of this image.</span>
<span class="doccomment">/// This method operates inplace.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">invert</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">invert</span>(<span class="ident">p</span>))
}
<span class="doccomment">/// Resize this image using the specified filter algorithm.</span>
<span class="doccomment">/// Returns a new image. The image's aspect ratio is preserved.</span>
<span class="doccomment">/// The image is scaled to the maximum possible size that fits</span>
<span class="doccomment">/// within the bounds specified by ```nwidth``` and ```nheight```.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">resize</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nwidth</span>: <span class="ident">u32</span>, <span class="ident">nheight</span>: <span class="ident">u32</span>, <span class="ident">filter</span>: <span class="ident">imageops</span>::<span class="ident">FilterType</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="kw">let</span> (<span class="ident">width2</span>, <span class="ident">height2</span>) <span class="op">=</span>
<span class="ident">resize_dimensions</span>(<span class="self">self</span>.<span class="ident">width</span>(), <span class="self">self</span>.<span class="ident">height</span>(), <span class="ident">nwidth</span>, <span class="ident">nheight</span>, <span class="bool-val">false</span>);
<span class="self">self</span>.<span class="ident">resize_exact</span>(<span class="ident">width2</span>, <span class="ident">height2</span>, <span class="ident">filter</span>)
}
<span class="doccomment">/// Resize this image using the specified filter algorithm.</span>
<span class="doccomment">/// Returns a new image. Does not preserve aspect ratio.</span>
<span class="doccomment">/// ```nwidth``` and ```nheight``` are the new image's dimensions</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">resize_exact</span>(
<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">nwidth</span>: <span class="ident">u32</span>,
<span class="ident">nheight</span>: <span class="ident">u32</span>,
<span class="ident">filter</span>: <span class="ident">imageops</span>::<span class="ident">FilterType</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">resize</span>(<span class="ident">p</span>, <span class="ident">nwidth</span>, <span class="ident">nheight</span>, <span class="ident">filter</span>))
}
<span class="doccomment">/// Scale this image down to fit within a specific size.</span>
<span class="doccomment">/// Returns a new image. The image's aspect ratio is preserved.</span>
<span class="doccomment">/// The image is scaled to the maximum possible size that fits</span>
<span class="doccomment">/// within the bounds specified by ```nwidth``` and ```nheight```.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method uses a fast integer algorithm where each source</span>
<span class="doccomment">/// pixel contributes to exactly one target pixel.</span>
<span class="doccomment">/// May give aliasing artifacts if new size is close to old size.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">thumbnail</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nwidth</span>: <span class="ident">u32</span>, <span class="ident">nheight</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="kw">let</span> (<span class="ident">width2</span>, <span class="ident">height2</span>) <span class="op">=</span>
<span class="ident">resize_dimensions</span>(<span class="self">self</span>.<span class="ident">width</span>(), <span class="self">self</span>.<span class="ident">height</span>(), <span class="ident">nwidth</span>, <span class="ident">nheight</span>, <span class="bool-val">false</span>);
<span class="self">self</span>.<span class="ident">thumbnail_exact</span>(<span class="ident">width2</span>, <span class="ident">height2</span>)
}
<span class="doccomment">/// Scale this image down to a specific size.</span>
<span class="doccomment">/// Returns a new image. Does not preserve aspect ratio.</span>
<span class="doccomment">/// ```nwidth``` and ```nheight``` are the new image's dimensions.</span>
<span class="doccomment">/// This method uses a fast integer algorithm where each source</span>
<span class="doccomment">/// pixel contributes to exactly one target pixel.</span>
<span class="doccomment">/// May give aliasing artifacts if new size is close to old size.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">thumbnail_exact</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">nwidth</span>: <span class="ident">u32</span>, <span class="ident">nheight</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">thumbnail</span>(<span class="ident">p</span>, <span class="ident">nwidth</span>, <span class="ident">nheight</span>))
}
<span class="doccomment">/// Resize this image using the specified filter algorithm.</span>
<span class="doccomment">/// Returns a new image. The image's aspect ratio is preserved.</span>
<span class="doccomment">/// The image is scaled to the maximum possible size that fits</span>
<span class="doccomment">/// within the larger (relative to aspect ratio) of the bounds</span>
<span class="doccomment">/// specified by ```nwidth``` and ```nheight```, then cropped to</span>
<span class="doccomment">/// fit within the other bound.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">resize_to_fill</span>(
<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">nwidth</span>: <span class="ident">u32</span>,
<span class="ident">nheight</span>: <span class="ident">u32</span>,
<span class="ident">filter</span>: <span class="ident">imageops</span>::<span class="ident">FilterType</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="kw">let</span> (<span class="ident">width2</span>, <span class="ident">height2</span>) <span class="op">=</span>
<span class="ident">resize_dimensions</span>(<span class="self">self</span>.<span class="ident">width</span>(), <span class="self">self</span>.<span class="ident">height</span>(), <span class="ident">nwidth</span>, <span class="ident">nheight</span>, <span class="bool-val">true</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">intermediate</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">resize_exact</span>(<span class="ident">width2</span>, <span class="ident">height2</span>, <span class="ident">filter</span>);
<span class="kw">let</span> (<span class="ident">iwidth</span>, <span class="ident">iheight</span>) <span class="op">=</span> <span class="ident">intermediate</span>.<span class="ident">dimensions</span>();
<span class="kw">let</span> <span class="ident">ratio</span> <span class="op">=</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">iwidth</span>) <span class="op">*</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">nheight</span>);
<span class="kw">let</span> <span class="ident">nratio</span> <span class="op">=</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">nwidth</span>) <span class="op">*</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">iheight</span>);
<span class="kw">if</span> <span class="ident">nratio</span> <span class="op">></span> <span class="ident">ratio</span> {
<span class="ident">intermediate</span>.<span class="ident">crop</span>(<span class="number">0</span>, (<span class="ident">iheight</span> <span class="op">-</span> <span class="ident">nheight</span>) <span class="op">/</span> <span class="number">2</span>, <span class="ident">nwidth</span>, <span class="ident">nheight</span>)
} <span class="kw">else</span> {
<span class="ident">intermediate</span>.<span class="ident">crop</span>((<span class="ident">iwidth</span> <span class="op">-</span> <span class="ident">nwidth</span>) <span class="op">/</span> <span class="number">2</span>, <span class="number">0</span>, <span class="ident">nwidth</span>, <span class="ident">nheight</span>)
}
}
<span class="doccomment">/// Performs a Gaussian blur on this image.</span>
<span class="doccomment">/// ```sigma``` is a measure of how much to blur by.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">blur</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">sigma</span>: <span class="ident">f32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">blur</span>(<span class="ident">p</span>, <span class="ident">sigma</span>))
}
<span class="doccomment">/// Performs an unsharpen mask on this image.</span>
<span class="doccomment">/// ```sigma``` is the amount to blur the image by.</span>
<span class="doccomment">/// ```threshold``` is a control of how much to sharpen.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See <https://en.wikipedia.org/wiki/Unsharp_masking#Digital_unsharp_masking></span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unsharpen</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">sigma</span>: <span class="ident">f32</span>, <span class="ident">threshold</span>: <span class="ident">i32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">unsharpen</span>(<span class="ident">p</span>, <span class="ident">sigma</span>, <span class="ident">threshold</span>))
}
<span class="doccomment">/// Filters this image with the specified 3x3 kernel.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">filter3x3</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">kernel</span>: <span class="kw-2">&</span>[<span class="ident">f32</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="kw">if</span> <span class="ident">kernel</span>.<span class="ident">len</span>() <span class="op">!</span><span class="op">=</span> <span class="number">9</span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"filter must be 3 x 3"</span>)
}
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">filter3x3</span>(<span class="ident">p</span>, <span class="ident">kernel</span>))
}
<span class="doccomment">/// Adjust the contrast of this image.</span>
<span class="doccomment">/// ```contrast``` is the amount to adjust the contrast by.</span>
<span class="doccomment">/// Negative values decrease the contrast and positive values increase the contrast.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">adjust_contrast</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">c</span>: <span class="ident">f32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">contrast</span>(<span class="ident">p</span>, <span class="ident">c</span>))
}
<span class="doccomment">/// Brighten the pixels of this image.</span>
<span class="doccomment">/// ```value``` is the amount to brighten each pixel by.</span>
<span class="doccomment">/// Negative values decrease the brightness and positive values increase it.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">brighten</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">brighten</span>(<span class="ident">p</span>, <span class="ident">value</span>))
}
<span class="doccomment">/// Hue rotate the supplied image.</span>
<span class="doccomment">/// `value` is the degrees to rotate each pixel by.</span>
<span class="doccomment">/// 0 and 360 do nothing, the rest rotates by the given degree value.</span>
<span class="doccomment">/// just like the css webkit filter hue-rotate(180)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">huerotate</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">huerotate</span>(<span class="ident">p</span>, <span class="ident">value</span>))
}
<span class="doccomment">/// Flip this image vertically</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">flipv</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">flip_vertical</span>(<span class="ident">p</span>))
}
<span class="doccomment">/// Flip this image horizontally</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fliph</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">flip_horizontal</span>(<span class="ident">p</span>))
}
<span class="doccomment">/// Rotate this image 90 degrees clockwise.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rotate90</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">rotate90</span>(<span class="ident">p</span>))
}
<span class="doccomment">/// Rotate this image 180 degrees clockwise.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rotate180</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">rotate180</span>(<span class="ident">p</span>))
}
<span class="doccomment">/// Rotate this image 270 degrees clockwise.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rotate270</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">DynamicImage</span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">=</span><span class="op">></span> <span class="ident">imageops</span>::<span class="ident">rotate270</span>(<span class="ident">p</span>))
}
<span class="doccomment">/// Encode this image and write it to ```w```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">write_to</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span>, <span class="ident">F</span>: <span class="ident">Into</span><span class="op"><</span><span class="ident">ImageOutputFormat</span><span class="op">></span><span class="op">></span>(
<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">w</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">W</span>,
<span class="ident">format</span>: <span class="ident">F</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">raw_pixels</span>();
<span class="kw">let</span> (<span class="ident">width</span>, <span class="ident">height</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">dimensions</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">color</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">color</span>();
<span class="kw">let</span> <span class="ident">format</span> <span class="op">=</span> <span class="ident">format</span>.<span class="ident">into</span>();
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">match</span> <span class="ident">format</span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"png_codec"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageOutputFormat</span>::<span class="ident">PNG</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">png</span>::<span class="ident">PNGEncoder</span>::<span class="ident">new</span>(<span class="ident">w</span>);
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">bytes</span><span class="op">=</span><span class="self">self</span>.<span class="ident">to_rgba</span>().<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="ident">color</span><span class="op">=</span><span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">RGBA</span>(<span class="number">8</span>);
},
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">bytes</span><span class="op">=</span><span class="self">self</span>.<span class="ident">to_rgb</span>().<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="ident">color</span><span class="op">=</span><span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">RGB</span>(<span class="number">8</span>);
},
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {},
}
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">encode</span>(<span class="kw-2">&</span><span class="ident">bytes</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>));
<span class="prelude-val">Ok</span>(())
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"pnm"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageOutputFormat</span>::<span class="ident">PNM</span>(<span class="ident">subtype</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">pnm</span>::<span class="ident">PNMEncoder</span>::<span class="ident">new</span>(<span class="ident">w</span>).<span class="ident">with_subtype</span>(<span class="ident">subtype</span>);
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">bytes</span><span class="op">=</span><span class="self">self</span>.<span class="ident">to_rgba</span>().<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="ident">color</span><span class="op">=</span><span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">RGBA</span>(<span class="number">8</span>);
},
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">bytes</span><span class="op">=</span><span class="self">self</span>.<span class="ident">to_rgb</span>().<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="ident">color</span><span class="op">=</span><span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">RGB</span>(<span class="number">8</span>);
},
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {},
}
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">encode</span>(<span class="kw-2">&</span><span class="ident">bytes</span>[..], <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>));
<span class="prelude-val">Ok</span>(())
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"jpeg"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageOutputFormat</span>::<span class="ident">JPEG</span>(<span class="ident">quality</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">j</span> <span class="op">=</span> <span class="ident">jpeg</span>::<span class="ident">JPEGEncoder</span>::<span class="ident">new_with_quality</span>(<span class="ident">w</span>, <span class="ident">quality</span>);
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">j</span>.<span class="ident">encode</span>(<span class="kw-2">&</span><span class="ident">bytes</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>));
<span class="prelude-val">Ok</span>(())
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"gif_codec"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageOutputFormat</span>::<span class="ident">GIF</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">gif</span>::<span class="ident">Encoder</span>::<span class="ident">new</span>(<span class="ident">w</span>);
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">g</span>.<span class="ident">encode</span>(<span class="kw-2">&</span><span class="ident">gif</span>::<span class="ident">Frame</span>::<span class="ident">from_rgba</span>(
<span class="ident">width</span> <span class="kw">as</span> <span class="ident">u16</span>,
<span class="ident">height</span> <span class="kw">as</span> <span class="ident">u16</span>,
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">to_rgba</span>().<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span>()
)));
<span class="prelude-val">Ok</span>(())
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ico"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageOutputFormat</span>::<span class="ident">ICO</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="ident">ico</span>::<span class="ident">ICOEncoder</span>::<span class="ident">new</span>(<span class="ident">w</span>);
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">i</span>.<span class="ident">encode</span>(<span class="kw-2">&</span><span class="ident">bytes</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>));
<span class="prelude-val">Ok</span>(())
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"bmp"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageOutputFormat</span>::<span class="ident">BMP</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">bmp</span>::<span class="ident">BMPEncoder</span>::<span class="ident">new</span>(<span class="ident">w</span>);
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">encode</span>(<span class="kw-2">&</span><span class="ident">bytes</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>));
<span class="prelude-val">Ok</span>(())
}
<span class="ident">image</span>::<span class="ident">ImageOutputFormat</span>::<span class="ident">Unsupported</span>(<span class="ident">msg</span>) <span class="op">=</span><span class="op">></span> {
<span class="prelude-val">Err</span>(<span class="ident">image</span>::<span class="ident">ImageError</span>::<span class="ident">UnsupportedError</span>(<span class="ident">msg</span>))
}
}
}
<span class="doccomment">/// Saves the buffer to a file at the path specified.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The image format is derived from the file extension.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">save</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">path</span>: <span class="ident">Q</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span>
<span class="kw">where</span>
<span class="ident">Q</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">Path</span><span class="op">></span>,
{
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> {
<span class="ident">p</span>.<span class="ident">save</span>(<span class="ident">path</span>)
})
}
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> <span class="ident">GenericImageView</span> <span class="kw">for</span> <span class="ident">DynamicImage</span> {
<span class="kw">type</span> <span class="ident">Pixel</span> <span class="op">=</span> <span class="ident">color</span>::<span class="ident">Rgba</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>;
<span class="kw">type</span> <span class="ident">InnerImageView</span> <span class="op">=</span> <span class="self">Self</span>;
<span class="kw">fn</span> <span class="ident">dimensions</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">u32</span>, <span class="ident">u32</span>) {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">dimensions</span>())
}
<span class="kw">fn</span> <span class="ident">bounds</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">u32</span>, <span class="ident">u32</span>) {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">bounds</span>())
}
<span class="kw">fn</span> <span class="ident">get_pixel</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="ident">u32</span>, <span class="ident">y</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">color</span>::<span class="ident">Rgba</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="macro">dynamic_map</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">ref</span> <span class="ident">p</span> <span class="op">-</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">get_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>).<span class="ident">to_rgba</span>())
}
<span class="kw">fn</span> <span class="ident">inner</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">InnerImageView</span> {
<span class="self">self</span>
}
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> <span class="ident">GenericImage</span> <span class="kw">for</span> <span class="ident">DynamicImage</span> {
<span class="kw">type</span> <span class="ident">InnerImage</span> <span class="op">=</span> <span class="ident">DynamicImage</span>;
<span class="kw">fn</span> <span class="ident">put_pixel</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">x</span>: <span class="ident">u32</span>, <span class="ident">y</span>: <span class="ident">u32</span>, <span class="ident">pixel</span>: <span class="ident">color</span>::<span class="ident">Rgba</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">put_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>.<span class="ident">to_luma</span>()),
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">put_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>.<span class="ident">to_luma_alpha</span>()),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">put_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>.<span class="ident">to_rgb</span>()),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">put_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">put_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>.<span class="ident">to_bgr</span>()),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">put_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>.<span class="ident">to_bgra</span>()),
}
}
<span class="doccomment">/// DEPRECATED: Use iterator `pixels_mut` to blend the pixels directly.</span>
<span class="kw">fn</span> <span class="ident">blend_pixel</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">x</span>: <span class="ident">u32</span>, <span class="ident">y</span>: <span class="ident">u32</span>, <span class="ident">pixel</span>: <span class="ident">color</span>::<span class="ident">Rgba</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">blend_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>.<span class="ident">to_luma</span>()),
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">blend_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>.<span class="ident">to_luma_alpha</span>()),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">blend_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>.<span class="ident">to_rgb</span>()),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">blend_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">blend_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>.<span class="ident">to_bgr</span>()),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="ident">p</span>.<span class="ident">blend_pixel</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">pixel</span>.<span class="ident">to_bgra</span>()),
}
}
<span class="doccomment">/// DEPRECATED: Do not use is function: It is unimplemented!</span>
<span class="kw">fn</span> <span class="ident">get_pixel_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw">_</span>: <span class="ident">u32</span>, <span class="kw">_</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">color</span>::<span class="ident">Rgba</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="macro">unimplemented</span><span class="macro">!</span>()
}
<span class="kw">fn</span> <span class="ident">inner_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>::<span class="ident">InnerImage</span> {
<span class="self">self</span>
}
}
<span class="doccomment">/// Decodes an image and stores it into a dynamic image</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">decoder_to_image</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">ImageDecoder</span><span class="op">></span>(<span class="ident">codec</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">DynamicImage</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">color</span> <span class="op">=</span> <span class="ident">codec</span>.<span class="ident">colortype</span>();
<span class="kw">let</span> (<span class="ident">w</span>, <span class="ident">h</span>) <span class="op">=</span> <span class="ident">codec</span>.<span class="ident">dimensions</span>();
<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">codec</span>.<span class="ident">read_image</span>());
<span class="comment">// TODO: Avoid this cast by having ImageBuffer use u64's</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">w</span> <span class="op"><</span><span class="op">=</span> <span class="ident">u32</span>::<span class="ident">max_value</span>() <span class="kw">as</span> <span class="ident">u64</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">h</span> <span class="op"><</span><span class="op">=</span> <span class="ident">u32</span>::<span class="ident">max_value</span>() <span class="kw">as</span> <span class="ident">u64</span>);
<span class="kw">let</span> (<span class="ident">w</span>, <span class="ident">h</span>) <span class="op">=</span> (<span class="ident">w</span> <span class="kw">as</span> <span class="ident">u32</span>, <span class="ident">h</span> <span class="kw">as</span> <span class="ident">u32</span>);
<span class="kw">let</span> <span class="ident">image</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">color</span> {
<span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">RGB</span>(<span class="number">8</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">ImageBuffer</span>::<span class="ident">from_raw</span>(<span class="ident">w</span>, <span class="ident">h</span>, <span class="ident">buf</span>).<span class="ident">map</span>(<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>)
}
<span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">RGBA</span>(<span class="number">8</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">ImageBuffer</span>::<span class="ident">from_raw</span>(<span class="ident">w</span>, <span class="ident">h</span>, <span class="ident">buf</span>).<span class="ident">map</span>(<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>)
}
<span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">BGR</span>(<span class="number">8</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">ImageBuffer</span>::<span class="ident">from_raw</span>(<span class="ident">w</span>, <span class="ident">h</span>, <span class="ident">buf</span>).<span class="ident">map</span>(<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>)
}
<span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">BGRA</span>(<span class="number">8</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">ImageBuffer</span>::<span class="ident">from_raw</span>(<span class="ident">w</span>, <span class="ident">h</span>, <span class="ident">buf</span>).<span class="ident">map</span>(<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>)
}
<span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="number">8</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">ImageBuffer</span>::<span class="ident">from_raw</span>(<span class="ident">w</span>, <span class="ident">h</span>, <span class="ident">buf</span>).<span class="ident">map</span>(<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>)
}
<span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">GrayA</span>(<span class="number">8</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">ImageBuffer</span>::<span class="ident">from_raw</span>(<span class="ident">w</span>, <span class="ident">h</span>, <span class="ident">buf</span>).<span class="ident">map</span>(<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>)
}
<span class="ident">color</span>::<span class="ident">ColorType</span>::<span class="ident">Gray</span>(<span class="ident">bit_depth</span>)
<span class="kw">if</span> <span class="ident">bit_depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">1</span> <span class="op">|</span><span class="op">|</span> <span class="ident">bit_depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">2</span> <span class="op">|</span><span class="op">|</span> <span class="ident">bit_depth</span> <span class="op">=</span><span class="op">=</span> <span class="number">4</span> <span class="op">=</span><span class="op">></span>
{
<span class="ident">gray_to_luma8</span>(<span class="ident">bit_depth</span>, <span class="ident">w</span>, <span class="ident">h</span>, <span class="kw-2">&</span><span class="ident">buf</span>).<span class="ident">map</span>(<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>)
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">image</span>::<span class="ident">ImageError</span>::<span class="ident">UnsupportedColor</span>(<span class="ident">color</span>)),
};
<span class="kw">match</span> <span class="ident">image</span> {
<span class="prelude-val">Some</span>(<span class="ident">image</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="ident">image</span>),
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">image</span>::<span class="ident">ImageError</span>::<span class="ident">DimensionError</span>),
}
}
<span class="kw">fn</span> <span class="ident">gray_to_luma8</span>(<span class="ident">bit_depth</span>: <span class="ident">u8</span>, <span class="ident">w</span>: <span class="ident">u32</span>, <span class="ident">h</span>: <span class="ident">u32</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">GrayImage</span><span class="op">></span> {
<span class="comment">// Note: this conversion assumes that the scanlines begin on byte boundaries</span>
<span class="kw">let</span> <span class="ident">mask</span> <span class="op">=</span> (<span class="number">1u8</span> <span class="op"><</span><span class="op"><</span> <span class="ident">bit_depth</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">-</span> <span class="number">1</span>;
<span class="kw">let</span> <span class="ident">scaling_factor</span> <span class="op">=</span> <span class="number">255</span> <span class="op">/</span> ((<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="ident">bit_depth</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">-</span> <span class="number">1</span>);
<span class="kw">let</span> <span class="ident">bit_width</span> <span class="op">=</span> <span class="ident">w</span> <span class="op">*</span> <span class="ident">u32</span>::<span class="ident">from</span>(<span class="ident">bit_depth</span>);
<span class="kw">let</span> <span class="ident">skip</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">bit_width</span> <span class="op">%</span> <span class="number">8</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="number">0</span>
} <span class="kw">else</span> {
(<span class="number">8</span> <span class="op">-</span> <span class="ident">bit_width</span> <span class="op">%</span> <span class="number">8</span>) <span class="op">/</span> <span class="ident">u32</span>::<span class="ident">from</span>(<span class="ident">bit_depth</span>)
};
<span class="kw">let</span> <span class="ident">row_len</span> <span class="op">=</span> <span class="ident">w</span> <span class="op">+</span> <span class="ident">skip</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> <span class="ident">v</span> <span class="kw">in</span> <span class="ident">buf</span> {
<span class="kw">for</span> <span class="ident">shift</span> <span class="kw">in</span> <span class="ident">num_iter</span>::<span class="ident">range_step_inclusive</span>(<span class="number">8i8</span><span class="op">-</span>(<span class="ident">bit_depth</span> <span class="kw">as</span> <span class="ident">i8</span>), <span class="number">0</span>, <span class="op">-</span>(<span class="ident">bit_depth</span> <span class="kw">as</span> <span class="ident">i8</span>)) {
<span class="comment">// skip the pixels that can be neglected because scanlines should</span>
<span class="comment">// start at byte boundaries</span>
<span class="kw">if</span> <span class="ident">i</span> <span class="op">%</span> (<span class="ident">row_len</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op"><</span> (<span class="ident">w</span> <span class="kw">as</span> <span class="ident">usize</span>) {
<span class="kw">let</span> <span class="ident">pixel</span> <span class="op">=</span> (<span class="ident">v</span> <span class="op">&</span> <span class="ident">mask</span> <span class="op"><</span><span class="op"><</span> <span class="ident">shift</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">></span><span class="op">></span> <span class="ident">shift</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="ident">p</span>.<span class="ident">push</span>(<span class="ident">pixel</span> <span class="op">*</span> <span class="ident">scaling_factor</span>);
}
<span class="ident">i</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
}
}
<span class="ident">ImageBuffer</span>::<span class="ident">from_raw</span>(<span class="ident">w</span>, <span class="ident">h</span>, <span class="ident">p</span>)
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">fn</span> <span class="ident">image_to_bytes</span>(<span class="ident">image</span>: <span class="kw-2">&</span><span class="ident">DynamicImage</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="ident">image</span> {
<span class="comment">// TODO: consider transmuting</span>
<span class="ident">DynamicImage</span>::<span class="ident">ImageLuma8</span>(<span class="kw-2">ref</span> <span class="ident">a</span>) <span class="op">=</span><span class="op">></span> <span class="ident">a</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>(),
<span class="ident">DynamicImage</span>::<span class="ident">ImageLumaA8</span>(<span class="kw-2">ref</span> <span class="ident">a</span>) <span class="op">=</span><span class="op">></span> <span class="ident">a</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>(),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(<span class="kw-2">ref</span> <span class="ident">a</span>) <span class="op">=</span><span class="op">></span> <span class="ident">a</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>(),
<span class="ident">DynamicImage</span>::<span class="ident">ImageRgba8</span>(<span class="kw-2">ref</span> <span class="ident">a</span>) <span class="op">=</span><span class="op">></span> <span class="ident">a</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>(),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgr8</span>(<span class="kw-2">ref</span> <span class="ident">a</span>) <span class="op">=</span><span class="op">></span> <span class="ident">a</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>(),
<span class="ident">DynamicImage</span>::<span class="ident">ImageBgra8</span>(<span class="kw-2">ref</span> <span class="ident">a</span>) <span class="op">=</span><span class="op">></span> <span class="ident">a</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>(),
}
}
<span class="doccomment">/// Open the image located at the path specified.</span>
<span class="doccomment">/// The image's format is determined from the path's file extension.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">open</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="ident">path</span>: <span class="ident">P</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">DynamicImage</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">Path</span><span class="op">></span>,
{
<span class="comment">// thin wrapper function to strip generics before calling open_impl</span>
<span class="ident">open_impl</span>(<span class="ident">path</span>.<span class="ident">as_ref</span>())
}
<span class="kw">fn</span> <span class="ident">open_impl</span>(<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">Path</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">DynamicImage</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">fin</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="ident">path</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">f</span>) <span class="op">=</span><span class="op">></span> <span class="ident">f</span>,
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">image</span>::<span class="ident">ImageError</span>::<span class="ident">IoError</span>(<span class="ident">err</span>)),
};
<span class="kw">let</span> <span class="ident">fin</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">new</span>(<span class="ident">fin</span>);
<span class="kw">let</span> <span class="ident">ext</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">extension</span>()
.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">to_str</span>())
.<span class="ident">map_or</span>(<span class="string">""</span>.<span class="ident">to_string</span>(), <span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">to_ascii_lowercase</span>());
<span class="kw">let</span> <span class="ident">format</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">&</span><span class="ident">ext</span>[..] {
<span class="string">"jpg"</span> <span class="op">|</span> <span class="string">"jpeg"</span> <span class="op">=</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">JPEG</span>,
<span class="string">"png"</span> <span class="op">=</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">PNG</span>,
<span class="string">"gif"</span> <span class="op">=</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">GIF</span>,
<span class="string">"webp"</span> <span class="op">=</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">WEBP</span>,
<span class="string">"tif"</span> <span class="op">|</span> <span class="string">"tiff"</span> <span class="op">=</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">TIFF</span>,
<span class="string">"tga"</span> <span class="op">=</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">TGA</span>,
<span class="string">"bmp"</span> <span class="op">=</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">BMP</span>,
<span class="string">"ico"</span> <span class="op">=</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">ICO</span>,
<span class="string">"hdr"</span> <span class="op">=</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">HDR</span>,
<span class="string">"pbm"</span> <span class="op">|</span> <span class="string">"pam"</span> <span class="op">|</span> <span class="string">"ppm"</span> <span class="op">|</span> <span class="string">"pgm"</span> <span class="op">=</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">PNM</span>,
<span class="ident">format</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">image</span>::<span class="ident">ImageError</span>::<span class="ident">UnsupportedError</span>(<span class="macro">format</span><span class="macro">!</span>(
<span class="string">"Image format image/{:?} is not supported."</span>,
<span class="ident">format</span>
)))
}
};
<span class="ident">load</span>(<span class="ident">fin</span>, <span class="ident">format</span>)
}
<span class="doccomment">/// Saves the supplied buffer to a file at the path specified.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The image format is derived from the file extension. The buffer is assumed to have</span>
<span class="doccomment">/// the correct format according to the specified color type.</span>
<span class="doccomment">/// This will lead to corrupted files if the buffer contains malformed data. Currently only</span>
<span class="doccomment">/// jpeg and png files are supported.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">save_buffer</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(
<span class="ident">path</span>: <span class="ident">P</span>,
<span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>],
<span class="ident">width</span>: <span class="ident">u32</span>,
<span class="ident">height</span>: <span class="ident">u32</span>,
<span class="ident">color</span>: <span class="ident">color</span>::<span class="ident">ColorType</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span>
<span class="kw">where</span>
<span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">Path</span><span class="op">></span>,
{
<span class="comment">// thin wrapper function to strip generics before calling save_buffer_impl</span>
<span class="ident">save_buffer_impl</span>(<span class="ident">path</span>.<span class="ident">as_ref</span>(), <span class="ident">buf</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>)
}
<span class="kw">fn</span> <span class="ident">save_buffer_impl</span>(
<span class="ident">path</span>: <span class="kw-2">&</span><span class="ident">Path</span>,
<span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>],
<span class="ident">width</span>: <span class="ident">u32</span>,
<span class="ident">height</span>: <span class="ident">u32</span>,
<span class="ident">color</span>: <span class="ident">color</span>::<span class="ident">ColorType</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="ident">fout</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">BufWriter</span>::<span class="ident">new</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">File</span>::<span class="ident">create</span>(<span class="ident">path</span>)));
<span class="kw">let</span> <span class="ident">ext</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">extension</span>()
.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">to_str</span>())
.<span class="ident">map_or</span>(<span class="string">""</span>.<span class="ident">to_string</span>(), <span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">to_ascii_lowercase</span>());
<span class="kw">match</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">ext</span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ico"</span>)]</span>
<span class="string">"ico"</span> <span class="op">=</span><span class="op">></span> <span class="ident">ico</span>::<span class="ident">ICOEncoder</span>::<span class="ident">new</span>(<span class="ident">fout</span>).<span class="ident">encode</span>(<span class="ident">buf</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"jpeg"</span>)]</span>
<span class="string">"jpg"</span> <span class="op">|</span> <span class="string">"jpeg"</span> <span class="op">=</span><span class="op">></span> <span class="ident">jpeg</span>::<span class="ident">JPEGEncoder</span>::<span class="ident">new</span>(<span class="ident">fout</span>).<span class="ident">encode</span>(<span class="ident">buf</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"png_codec"</span>)]</span>
<span class="string">"png"</span> <span class="op">=</span><span class="op">></span> <span class="ident">png</span>::<span class="ident">PNGEncoder</span>::<span class="ident">new</span>(<span class="ident">fout</span>).<span class="ident">encode</span>(<span class="ident">buf</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"pnm"</span>)]</span>
<span class="string">"pbm"</span> <span class="op">=</span><span class="op">></span> <span class="ident">pnm</span>::<span class="ident">PNMEncoder</span>::<span class="ident">new</span>(<span class="ident">fout</span>)
.<span class="ident">with_subtype</span>(<span class="ident">pnm</span>::<span class="ident">PNMSubtype</span>::<span class="ident">Bitmap</span>(<span class="ident">pnm</span>::<span class="ident">SampleEncoding</span>::<span class="ident">Binary</span>))
.<span class="ident">encode</span>(<span class="ident">buf</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"pnm"</span>)]</span>
<span class="string">"pgm"</span> <span class="op">=</span><span class="op">></span> <span class="ident">pnm</span>::<span class="ident">PNMEncoder</span>::<span class="ident">new</span>(<span class="ident">fout</span>)
.<span class="ident">with_subtype</span>(<span class="ident">pnm</span>::<span class="ident">PNMSubtype</span>::<span class="ident">Graymap</span>(<span class="ident">pnm</span>::<span class="ident">SampleEncoding</span>::<span class="ident">Binary</span>))
.<span class="ident">encode</span>(<span class="ident">buf</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"pnm"</span>)]</span>
<span class="string">"ppm"</span> <span class="op">=</span><span class="op">></span> <span class="ident">pnm</span>::<span class="ident">PNMEncoder</span>::<span class="ident">new</span>(<span class="ident">fout</span>)
.<span class="ident">with_subtype</span>(<span class="ident">pnm</span>::<span class="ident">PNMSubtype</span>::<span class="ident">Pixmap</span>(<span class="ident">pnm</span>::<span class="ident">SampleEncoding</span>::<span class="ident">Binary</span>))
.<span class="ident">encode</span>(<span class="ident">buf</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"pnm"</span>)]</span>
<span class="string">"pam"</span> <span class="op">=</span><span class="op">></span> <span class="ident">pnm</span>::<span class="ident">PNMEncoder</span>::<span class="ident">new</span>(<span class="ident">fout</span>).<span class="ident">encode</span>(<span class="ident">buf</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"bmp"</span>)]</span>
<span class="string">"bmp"</span> <span class="op">=</span><span class="op">></span> <span class="ident">bmp</span>::<span class="ident">BMPEncoder</span>::<span class="ident">new</span>(<span class="ident">fout</span>).<span class="ident">encode</span>(<span class="ident">buf</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">color</span>),
<span class="ident">format</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(
<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">InvalidInput</span>,
<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"Unsupported image format image/{:?}"</span>, <span class="ident">format</span>)[..],
)),
}
}
<span class="doccomment">/// Create a new image from a Reader</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span> <span class="op">+</span> <span class="ident">Seek</span><span class="op">></span>(<span class="ident">r</span>: <span class="ident">R</span>, <span class="ident">format</span>: <span class="ident">ImageFormat</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">DynamicImage</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>, <span class="ident">unreachable_patterns</span>)]</span>
<span class="comment">// Default is unreachable if all features are supported.</span>
<span class="kw">match</span> <span class="ident">format</span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"png_codec"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">PNG</span> <span class="op">=</span><span class="op">></span> <span class="ident">decoder_to_image</span>(<span class="ident">png</span>::<span class="ident">PNGDecoder</span>::<span class="ident">new</span>(<span class="ident">r</span>)<span class="question-mark">?</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"gif_codec"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">GIF</span> <span class="op">=</span><span class="op">></span> <span class="ident">decoder_to_image</span>(<span class="ident">gif</span>::<span class="ident">Decoder</span>::<span class="ident">new</span>(<span class="ident">r</span>)<span class="question-mark">?</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"jpeg"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">JPEG</span> <span class="op">=</span><span class="op">></span> <span class="ident">decoder_to_image</span>(<span class="ident">jpeg</span>::<span class="ident">JPEGDecoder</span>::<span class="ident">new</span>(<span class="ident">r</span>)<span class="question-mark">?</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"webp"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">WEBP</span> <span class="op">=</span><span class="op">></span> <span class="ident">decoder_to_image</span>(<span class="ident">webp</span>::<span class="ident">WebpDecoder</span>::<span class="ident">new</span>(<span class="ident">r</span>)<span class="question-mark">?</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"tiff"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">TIFF</span> <span class="op">=</span><span class="op">></span> <span class="ident">decoder_to_image</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">tiff</span>::<span class="ident">TIFFDecoder</span>::<span class="ident">new</span>(<span class="ident">r</span>))),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"tga"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">TGA</span> <span class="op">=</span><span class="op">></span> <span class="ident">decoder_to_image</span>(<span class="ident">tga</span>::<span class="ident">TGADecoder</span>::<span class="ident">new</span>(<span class="ident">r</span>)<span class="question-mark">?</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"bmp"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">BMP</span> <span class="op">=</span><span class="op">></span> <span class="ident">decoder_to_image</span>(<span class="ident">bmp</span>::<span class="ident">BMPDecoder</span>::<span class="ident">new</span>(<span class="ident">r</span>)<span class="question-mark">?</span>),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ico"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">ICO</span> <span class="op">=</span><span class="op">></span> <span class="ident">decoder_to_image</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">ico</span>::<span class="ident">ICODecoder</span>::<span class="ident">new</span>(<span class="ident">r</span>))),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"hdr"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">HDR</span> <span class="op">=</span><span class="op">></span> <span class="ident">decoder_to_image</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">hdr</span>::<span class="ident">HDRAdapter</span>::<span class="ident">new</span>(<span class="ident">BufReader</span>::<span class="ident">new</span>(<span class="ident">r</span>)))),
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"pnm"</span>)]</span>
<span class="ident">image</span>::<span class="ident">ImageFormat</span>::<span class="ident">PNM</span> <span class="op">=</span><span class="op">></span> <span class="ident">decoder_to_image</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">pnm</span>::<span class="ident">PNMDecoder</span>::<span class="ident">new</span>(<span class="ident">BufReader</span>::<span class="ident">new</span>(<span class="ident">r</span>)))),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">image</span>::<span class="ident">ImageError</span>::<span class="ident">UnsupportedError</span>(<span class="macro">format</span><span class="macro">!</span>(
<span class="string">"A decoder for {:?} is not available."</span>,
<span class="ident">format</span>
))),
}
}
<span class="kw">static</span> <span class="ident">MAGIC_BYTES</span>: [(<span class="kw-2">&</span><span class="lifetime">'static</span> [<span class="ident">u8</span>], <span class="ident">ImageFormat</span>); <span class="number">17</span>] <span class="op">=</span> [
(<span class="string">b"\x89PNG\r\n\x1a\n"</span>, <span class="ident">ImageFormat</span>::<span class="ident">PNG</span>),
(<span class="kw-2">&</span>[<span class="number">0xff</span>, <span class="number">0xd8</span>, <span class="number">0xff</span>], <span class="ident">ImageFormat</span>::<span class="ident">JPEG</span>),
(<span class="string">b"GIF89a"</span>, <span class="ident">ImageFormat</span>::<span class="ident">GIF</span>),
(<span class="string">b"GIF87a"</span>, <span class="ident">ImageFormat</span>::<span class="ident">GIF</span>),
(<span class="string">b"RIFF"</span>, <span class="ident">ImageFormat</span>::<span class="ident">WEBP</span>), <span class="comment">// TODO: better magic byte detection, see https://github.com/image-rs/image/issues/660</span>
(<span class="string">b"MM.*"</span>, <span class="ident">ImageFormat</span>::<span class="ident">TIFF</span>),
(<span class="string">b"II*."</span>, <span class="ident">ImageFormat</span>::<span class="ident">TIFF</span>),
(<span class="string">b"BM"</span>, <span class="ident">ImageFormat</span>::<span class="ident">BMP</span>),
(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>], <span class="ident">ImageFormat</span>::<span class="ident">ICO</span>),
(<span class="string">b"#?RADIANCE"</span>, <span class="ident">ImageFormat</span>::<span class="ident">HDR</span>),
(<span class="string">b"P1"</span>, <span class="ident">ImageFormat</span>::<span class="ident">PNM</span>),
(<span class="string">b"P2"</span>, <span class="ident">ImageFormat</span>::<span class="ident">PNM</span>),
(<span class="string">b"P3"</span>, <span class="ident">ImageFormat</span>::<span class="ident">PNM</span>),
(<span class="string">b"P4"</span>, <span class="ident">ImageFormat</span>::<span class="ident">PNM</span>),
(<span class="string">b"P5"</span>, <span class="ident">ImageFormat</span>::<span class="ident">PNM</span>),
(<span class="string">b"P6"</span>, <span class="ident">ImageFormat</span>::<span class="ident">PNM</span>),
(<span class="string">b"P7"</span>, <span class="ident">ImageFormat</span>::<span class="ident">PNM</span>),
];
<span class="doccomment">/// Create a new image from a byte slice</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Makes an educated guess about the image format.</span>
<span class="doccomment">/// TGA is not supported by this function.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load_from_memory</span>(<span class="ident">buffer</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">DynamicImage</span><span class="op">></span> {
<span class="ident">load_from_memory_with_format</span>(<span class="ident">buffer</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">guess_format</span>(<span class="ident">buffer</span>)))
}
<span class="doccomment">/// Create a new image from a byte slice</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load_from_memory_with_format</span>(<span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>], <span class="ident">format</span>: <span class="ident">ImageFormat</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">DynamicImage</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">io</span>::<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="ident">buf</span>);
<span class="ident">load</span>(<span class="ident">b</span>, <span class="ident">format</span>)
}
<span class="doccomment">/// Guess image format from memory block</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Makes an educated guess about the image format based on the Magic Bytes at the beginning.</span>
<span class="doccomment">/// TGA is not supported by this function.</span>
<span class="doccomment">/// This is not to be trusted on the validity of the whole memory block</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">guess_format</span>(<span class="ident">buffer</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">ImageFormat</span><span class="op">></span> {
<span class="kw">for</span> <span class="kw-2">&</span>(<span class="ident">signature</span>, <span class="ident">format</span>) <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">MAGIC_BYTES</span> {
<span class="kw">if</span> <span class="ident">buffer</span>.<span class="ident">starts_with</span>(<span class="ident">signature</span>) {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">format</span>);
}
}
<span class="prelude-val">Err</span>(<span class="ident">image</span>::<span class="ident">ImageError</span>::<span class="ident">UnsupportedError</span>(
<span class="string">"Unsupported image format"</span>.<span class="ident">to_string</span>(),
))
}
<span class="doccomment">/// Calculates the width and height an image should be resized to.</span>
<span class="doccomment">/// This preserves aspect ratio, and based on the `fill` parameter</span>
<span class="doccomment">/// will either fill the dimensions to fit inside the smaller constraint</span>
<span class="doccomment">/// (will overflow the specified bounds on one axis to preserve</span>
<span class="doccomment">/// aspect ratio), or will shrink so that both dimensions are</span>
<span class="doccomment">/// completely contained with in the given `width` and `height`,</span>
<span class="doccomment">/// with empty space on one axis.</span>
<span class="kw">fn</span> <span class="ident">resize_dimensions</span>(<span class="ident">width</span>: <span class="ident">u32</span>, <span class="ident">height</span>: <span class="ident">u32</span>, <span class="ident">nwidth</span>: <span class="ident">u32</span>, <span class="ident">nheight</span>: <span class="ident">u32</span>, <span class="ident">fill</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">u32</span>, <span class="ident">u32</span>) {
<span class="kw">let</span> <span class="ident">ratio</span> <span class="op">=</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">width</span>) <span class="op">*</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">nheight</span>);
<span class="kw">let</span> <span class="ident">nratio</span> <span class="op">=</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">nwidth</span>) <span class="op">*</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">height</span>);
<span class="kw">let</span> <span class="ident">use_width</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">fill</span> {
<span class="ident">nratio</span> <span class="op">></span> <span class="ident">ratio</span>
} <span class="kw">else</span> {
<span class="ident">nratio</span> <span class="op"><</span><span class="op">=</span> <span class="ident">ratio</span>
};
<span class="kw">let</span> <span class="ident">intermediate</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">use_width</span> {
<span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">height</span>) <span class="op">*</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">nwidth</span>) <span class="op">/</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">width</span>)
} <span class="kw">else</span> {
<span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">width</span>) <span class="op">*</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">nheight</span>) <span class="op">/</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">height</span>)
};
<span class="kw">if</span> <span class="ident">use_width</span> {
<span class="kw">if</span> <span class="ident">intermediate</span> <span class="op"><</span><span class="op">=</span> <span class="ident">u64</span>::<span class="ident">from</span>(::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>) {
(<span class="ident">nwidth</span>, <span class="ident">intermediate</span> <span class="kw">as</span> <span class="ident">u32</span>)
} <span class="kw">else</span> {
(
(<span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">nwidth</span>) <span class="op">*</span> <span class="ident">u64</span>::<span class="ident">from</span>(::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>) <span class="op">/</span> <span class="ident">intermediate</span>) <span class="kw">as</span> <span class="ident">u32</span>,
::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>,
)
}
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">intermediate</span> <span class="op"><</span><span class="op">=</span> <span class="ident">u64</span>::<span class="ident">from</span>(::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>) {
(<span class="ident">intermediate</span> <span class="kw">as</span> <span class="ident">u32</span>, <span class="ident">nheight</span>)
} <span class="kw">else</span> {
(
::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>,
(<span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">nheight</span>) <span class="op">*</span> <span class="ident">u64</span>::<span class="ident">from</span>(::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>) <span class="op">/</span> <span class="ident">intermediate</span>) <span class="kw">as</span> <span class="ident">u32</span>,
)
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">bench</span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"benchmarks"</span>)]</span>
<span class="kw">use</span> <span class="ident">test</span>;
<span class="attribute">#[<span class="ident">bench</span>]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"benchmarks"</span>)]</span>
<span class="kw">fn</span> <span class="ident">bench_conversion</span>(<span class="ident">b</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">test</span>::<span class="ident">Bencher</span>) {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">DynamicImage</span>::<span class="ident">ImageRgb8</span>(::<span class="ident">ImageBuffer</span>::<span class="ident">new</span>(<span class="number">1000</span>, <span class="number">1000</span>));
<span class="ident">b</span>.<span class="ident">iter</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">a</span>.<span class="ident">to_luma</span>());
<span class="ident">b</span>.<span class="ident">bytes</span> <span class="op">=</span> <span class="number">1000</span> <span class="op">*</span> <span class="number">1000</span> <span class="op">*</span> <span class="number">3</span>
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test</span> {
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_empty_file</span>() {
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw">super</span>::<span class="ident">load_from_memory</span>(<span class="string">b""</span>).<span class="ident">is_err</span>());
}
<span class="macro">quickcheck</span><span class="macro">!</span> {
<span class="kw">fn</span> <span class="ident">resize_bounds_correctly_width</span>(<span class="ident">old_w</span>: <span class="ident">u32</span>, <span class="ident">new_w</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">if</span> <span class="ident">old_w</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="ident">new_w</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> { <span class="kw">return</span> <span class="bool-val">true</span>; }
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">resize_dimensions</span>(<span class="ident">old_w</span>, <span class="number">400</span>, <span class="ident">new_w</span>, ::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>, <span class="bool-val">false</span>);
<span class="ident">result</span>.<span class="number">0</span> <span class="op">=</span><span class="op">=</span> <span class="ident">new_w</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">result</span>.<span class="number">1</span> <span class="op">=</span><span class="op">=</span> (<span class="number">400</span> <span class="kw">as</span> <span class="ident">f64</span> <span class="op">*</span> <span class="ident">new_w</span> <span class="kw">as</span> <span class="ident">f64</span> <span class="op">/</span> <span class="ident">old_w</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="kw">as</span> <span class="ident">u32</span>
}
}
<span class="macro">quickcheck</span><span class="macro">!</span> {
<span class="kw">fn</span> <span class="ident">resize_bounds_correctly_height</span>(<span class="ident">old_h</span>: <span class="ident">u32</span>, <span class="ident">new_h</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">if</span> <span class="ident">old_h</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="ident">new_h</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> { <span class="kw">return</span> <span class="bool-val">true</span>; }
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">resize_dimensions</span>(<span class="number">400</span>, <span class="ident">old_h</span>, ::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>, <span class="ident">new_h</span>, <span class="bool-val">false</span>);
<span class="ident">result</span>.<span class="number">1</span> <span class="op">=</span><span class="op">=</span> <span class="ident">new_h</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">result</span>.<span class="number">0</span> <span class="op">=</span><span class="op">=</span> (<span class="number">400</span> <span class="kw">as</span> <span class="ident">f64</span> <span class="op">*</span> <span class="ident">new_h</span> <span class="kw">as</span> <span class="ident">f64</span> <span class="op">/</span> <span class="ident">old_h</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="kw">as</span> <span class="ident">u32</span>
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">resize_handles_fill</span>() {
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">resize_dimensions</span>(<span class="number">100</span>, <span class="number">200</span>, <span class="number">200</span>, <span class="number">500</span>, <span class="bool-val">true</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="number">0</span> <span class="op">=</span><span class="op">=</span> <span class="number">250</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="number">1</span> <span class="op">=</span><span class="op">=</span> <span class="number">500</span>);
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">resize_dimensions</span>(<span class="number">200</span>, <span class="number">100</span>, <span class="number">500</span>, <span class="number">200</span>, <span class="bool-val">true</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="number">0</span> <span class="op">=</span><span class="op">=</span> <span class="number">500</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="number">1</span> <span class="op">=</span><span class="op">=</span> <span class="number">250</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">resize_handles_overflow</span>() {
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">resize_dimensions</span>(<span class="number">100</span>, ::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>, <span class="number">200</span>, ::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>, <span class="bool-val">true</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="number">0</span> <span class="op">=</span><span class="op">=</span> <span class="number">100</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="number">1</span> <span class="op">=</span><span class="op">=</span> ::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>);
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw">super</span>::<span class="ident">resize_dimensions</span>(::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>, <span class="number">100</span>, ::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>, <span class="number">200</span>, <span class="bool-val">true</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="number">0</span> <span class="op">=</span><span class="op">=</span> ::<span class="ident">std</span>::<span class="ident">u32</span>::<span class="ident">MAX</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="number">1</span> <span class="op">=</span><span class="op">=</span> <span class="number">100</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">gray_to_luma8_skip</span>() {
<span class="kw">let</span> <span class="ident">check</span> <span class="op">=</span> <span class="op">|</span><span class="ident">bit_depth</span>, <span class="ident">w</span>, <span class="ident">h</span>, <span class="ident">from</span>, <span class="ident">to</span><span class="op">|</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="kw">super</span>::<span class="ident">gray_to_luma8</span>(<span class="ident">bit_depth</span>, <span class="ident">w</span>, <span class="ident">h</span>, <span class="ident">from</span>).<span class="ident">map</span>(<span class="kw">super</span>::<span class="ident">GrayImage</span>::<span class="ident">into_raw</span>),
<span class="prelude-val">Some</span>(<span class="ident">to</span>));
};
<span class="comment">// Bit depth 1, skip is more than half a byte</span>
<span class="ident">check</span>(
<span class="number">1</span>, <span class="number">10</span>, <span class="number">2</span>,
<span class="kw-2">&</span>[<span class="number">0b11110000</span>, <span class="number">0b11000000</span>, <span class="number">0b00001111</span>, <span class="number">0b11000000</span>],
<span class="macro">vec</span><span class="macro">!</span>[<span class="number">255</span>, <span class="number">255</span>, <span class="number">255</span>, <span class="number">255</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">255</span>, <span class="number">255</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">255</span>, <span class="number">255</span>, <span class="number">255</span>, <span class="number">255</span>, <span class="number">255</span>, <span class="number">255</span>]);
<span class="comment">// Bit depth 2, skip is more than half a byte</span>
<span class="ident">check</span>(
<span class="number">2</span>, <span class="number">5</span>, <span class="number">2</span>,
<span class="kw-2">&</span>[<span class="number">0b11110000</span>, <span class="number">0b11000000</span>, <span class="number">0b00001111</span>, <span class="number">0b11000000</span>],
<span class="macro">vec</span><span class="macro">!</span>[<span class="number">255</span>, <span class="number">255</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">255</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">255</span>, <span class="number">255</span>, <span class="number">255</span>]);
<span class="comment">// Bit depth 2, skip is 0</span>
<span class="ident">check</span>(
<span class="number">2</span>, <span class="number">4</span>, <span class="number">2</span>,
<span class="kw-2">&</span>[<span class="number">0b11110000</span>, <span class="number">0b00001111</span>],
<span class="macro">vec</span><span class="macro">!</span>[<span class="number">255</span>, <span class="number">255</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">255</span>, <span class="number">255</span>]);
<span class="comment">// Bit depth 4, skip is half a byte</span>
<span class="ident">check</span>(
<span class="number">4</span>, <span class="number">1</span>, <span class="number">2</span>,
<span class="kw-2">&</span>[<span class="number">0b11110011</span>, <span class="number">0b00001100</span>],
<span class="macro">vec</span><span class="macro">!</span>[<span class="number">255</span>, <span class="number">0</span>]);
}
}
</pre></div>
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