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<!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="API documentation for the Rust `png` crate."><meta name="keywords" content="rust, rustlang, rust-lang, png"><title>png - Rust</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></head><body class="rustdoc mod"><!--[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><p class='location'>Crate png</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'png', ty: 'mod', relpath: '../'};</script></div></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"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><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"><h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>png</a></span><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/png/lib.rs.html#1-64' title='goto source code'>[src]</a></span></h1><div class='docblock'><h1 id="png-encoder-and-decoder" class="section-header"><a href="#png-encoder-and-decoder">PNG encoder and decoder</a></h1>
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<p>This crate contains a PNG encoder and decoder. It supports reading of single lines or whole frames.</p>
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<h2 id="the-decoder" class="section-header"><a href="#the-decoder">The decoder</a></h2>
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<p>The most important types for decoding purposes are <a href="struct.Decoder.html"><code>Decoder</code></a> and
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<a href="struct.Reader.html"><code>Reader</code></a>. They both wrap a <code>std::io::Read</code>.
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<code>Decoder</code> serves as a builder for <code>Reader</code>. Calling <code>Decoder::read_info</code> reads from the <code>Read</code> until the
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image data is reached.</p>
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<h3 id="using-the-decoder" class="section-header"><a href="#using-the-decoder">Using the decoder</a></h3>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
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<span class="comment">// The decoder is a build for reader and can be used to set various decoding options</span>
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<span class="comment">// via `Transformations`. The default output transformation is `Transformations::EXPAND</span>
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<span class="comment">// | Transformations::STRIP_ALPHA`.</span>
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<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">png</span>::<span class="ident">Decoder</span>::<span class="ident">new</span>(<span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"tests/pngsuite/basi0g01.png"</span>).<span class="ident">unwrap</span>());
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<span class="kw">let</span> (<span class="ident">info</span>, <span class="kw-2">mut</span> <span class="ident">reader</span>) <span class="op">=</span> <span class="ident">decoder</span>.<span class="ident">read_info</span>().<span class="ident">unwrap</span>();
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<span class="comment">// Allocate the output buffer.</span>
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>; <span class="ident">info</span>.<span class="ident">buffer_size</span>()];
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<span class="comment">// Read the next frame. Currently this function should only called once.</span>
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<span class="comment">// The default options</span>
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<span class="ident">reader</span>.<span class="ident">next_frame</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>();</pre>
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<h2 id="encoder" class="section-header"><a href="#encoder">Encoder</a></h2><h3 id="using-the-encoder" class="section-header"><a href="#using-the-encoder">Using the encoder</a></h3>
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<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
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<span class="comment">// For reading and opening files</span>
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">path</span>::<span class="ident">Path</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">BufWriter</span>;
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<span class="comment">// To use encoder.set()</span>
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<span class="kw">use</span> <span class="ident">png</span>::<span class="ident">HasParameters</span>;
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<span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">Path</span>::<span class="ident">new</span>(<span class="string">r"/path/to/image.png"</span>);
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<span class="kw">let</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">create</span>(<span class="ident">path</span>).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">w</span> <span class="op">=</span> <span class="ident">BufWriter</span>::<span class="ident">new</span>(<span class="ident">file</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">encoder</span> <span class="op">=</span> <span class="ident">png</span>::<span class="ident">Encoder</span>::<span class="ident">new</span>(<span class="ident">w</span>, <span class="number">2</span>, <span class="number">1</span>); <span class="comment">// Width is 2 pixels and height is 1.</span>
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<span class="ident">encoder</span>.<span class="ident">set</span>(<span class="ident">png</span>::<span class="ident">ColorType</span>::<span class="ident">RGBA</span>).<span class="ident">set</span>(<span class="ident">png</span>::<span class="ident">BitDepth</span>::<span class="ident">Eight</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">encoder</span>.<span class="ident">write_header</span>().<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</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">0</span>, <span class="number">255</span>]; <span class="comment">// An array containing a RGBA sequence. First pixel is red and second pixel is black.</span>
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<span class="ident">writer</span>.<span class="ident">write_image_data</span>(<span class="kw-2">&</span><span class="ident">data</span>).<span class="ident">unwrap</span>(); <span class="comment">// Save</span></pre>
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</div><h2 id='modules' class='section-header'><a href="#modules">Modules</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="mod" href="chunk/index.html"
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title='mod png::chunk'>chunk</a></td>
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<td class='docblock-short'>
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<p>Chunk types and functions</p>
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</td>
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</tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.AnimationControl.html"
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title='struct png::AnimationControl'>AnimationControl</a></td>
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<td class='docblock-short'>
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<p>Animation control information</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Decoder.html"
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title='struct png::Decoder'>Decoder</a></td>
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<td class='docblock-short'>
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<p>PNG Decoder</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Encoder.html"
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title='struct png::Encoder'>Encoder</a></td>
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<td class='docblock-short'>
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<p>PNG Encoder</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.FrameControl.html"
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title='struct png::FrameControl'>FrameControl</a></td>
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<td class='docblock-short'>
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<p>Frame control information</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Info.html"
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title='struct png::Info'>Info</a></td>
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<td class='docblock-short'>
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<p>PNG info struct</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.OutputInfo.html"
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title='struct png::OutputInfo'>OutputInfo</a></td>
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<td class='docblock-short'>
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<p>Output info</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.PixelDimensions.html"
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title='struct png::PixelDimensions'>PixelDimensions</a></td>
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<td class='docblock-short'>
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<p>Pixel dimensions information</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Reader.html"
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title='struct png::Reader'>Reader</a></td>
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<td class='docblock-short'>
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<p>PNG reader (mostly high-level interface)</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.StreamingDecoder.html"
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title='struct png::StreamingDecoder'>StreamingDecoder</a></td>
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<td class='docblock-short'>
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<p>PNG StreamingDecoder (low-level interface)</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Transformations.html"
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title='struct png::Transformations'>Transformations</a></td>
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<td class='docblock-short'>
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<p>Output transformations</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Writer.html"
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title='struct png::Writer'>Writer</a></td>
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<td class='docblock-short'>
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<p>PNG writer</p>
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</td>
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</tr></table><h2 id='enums' class='section-header'><a href="#enums">Enums</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="enum" href="enum.BitDepth.html"
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title='enum png::BitDepth'>BitDepth</a></td>
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<td class='docblock-short'>
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<p>Bit depth of the png file</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="enum" href="enum.ColorType.html"
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title='enum png::ColorType'>ColorType</a></td>
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<td class='docblock-short'>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="enum" href="enum.Decoded.html"
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title='enum png::Decoded'>Decoded</a></td>
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<td class='docblock-short'>
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<p>Result of the decoding process</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="enum" href="enum.DecodingError.html"
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title='enum png::DecodingError'>DecodingError</a></td>
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<td class='docblock-short'>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="enum" href="enum.EncodingError.html"
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title='enum png::EncodingError'>EncodingError</a></td>
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<td class='docblock-short'>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="enum" href="enum.Unit.html"
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title='enum png::Unit'>Unit</a></td>
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<td class='docblock-short'>
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<p>Physical unit of the pixel dimensions</p>
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</td>
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</tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="trait" href="trait.HasParameters.html"
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title='trait png::HasParameters'>HasParameters</a></td>
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<td class='docblock-short'>
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<p>Object has parameters</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="trait" href="trait.Parameter.html"
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title='trait png::Parameter'>Parameter</a></td>
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<td class='docblock-short'>
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<p>Configuration parameter trait</p>
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</td>
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</tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../";window.currentCrate = "png";</script><script src="../aliases.js"></script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>
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