hasufell
/
pnmixer-rust
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
pnmixer-rust/png/index.html

430 lines
25 KiB
HTML
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

<!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">
<link rel="stylesheet" type="text/css" href="../main.css">
</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">
<p class='location'>Crate png</p><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="#constants">Constants</a></li><li><a href="#traits">Traits</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'png', ty: 'mod', relpath: '../'};</script>
</nav>
<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">
</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'>&#x2212;</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>
<p>This crate contains a PNG encoder and decoder. It supports reading of single lines or whole frames.</p>
<h2 id='the-decoder' class='section-header'><a href='#the-decoder'>The decoder</a></h2>
<p>The most important types for decoding purposes are <a href="struct.Decoder.html"><code>Decoder</code></a> and
<a href="struct.Reader.html"><code>Reader</code></a>. They both wrap a <code>std::io::Read</code>.
<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
image data is reached.</p>
<h3 id='using-the-decoder' class='section-header'><a href='#using-the-decoder'>Using the decoder</a></h3>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
<span class="comment">// The decoder is a build for reader and can be used to set various decoding options</span>
<span class="comment">// via `Transformations`. The default output transformation is `TRANSFORM_EXPAND</span>
<span class="comment">// | TRANSFORM_STRIP_ALPHA`.</span>
<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">&quot;tests/pngsuite/basi0g01.png&quot;</span>).<span class="ident">unwrap</span>());
<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>();
<span class="comment">// Allocate the output buffer.</span>
<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>()];
<span class="comment">// Read the next frame. Currently this function should only called once.</span>
<span class="comment">// The default options</span>
<span class="ident">reader</span>.<span class="ident">next_frame</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>();</pre>
<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>
<pre class="rust rust-example-rendered">
<span class="comment">// For reading and opening files</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">path</span>::<span class="ident">Path</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="ident">BufWriter</span>;
<span class="comment">// To use encoder.set()</span>
<span class="kw">use</span> <span class="ident">png</span>::<span class="ident">HasParameters</span>;
<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&quot;/path/to/image.png&quot;</span>);
<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>();
<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>);
<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>
<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>);
<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>();
<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>
<span class="ident">writer</span>.<span class="ident">write_image_data</span>(<span class="kw-2">&amp;</span><span class="ident">data</span>).<span class="ident">unwrap</span>(); <span class="comment">// Save</span></pre>
</div><h2 id='modules' class='section-header'><a href="#modules">Modules</a></h2>
<table>
<tr class=' module-item'>
<td><a class="mod" href="chunk/index.html"
title='mod png::chunk'>chunk</a></td>
<td class='docblock-short'>
<p>Chunk types and functions</p>
</td>
</tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
<table>
<tr class=' module-item'>
<td><a class="struct" href="struct.AnimationControl.html"
title='struct png::AnimationControl'>AnimationControl</a></td>
<td class='docblock-short'>
<p>Animation control information</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Decoder.html"
title='struct png::Decoder'>Decoder</a></td>
<td class='docblock-short'>
<p>PNG Decoder</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Encoder.html"
title='struct png::Encoder'>Encoder</a></td>
<td class='docblock-short'>
<p>PNG Encoder</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.FrameControl.html"
title='struct png::FrameControl'>FrameControl</a></td>
<td class='docblock-short'>
<p>Frame control information</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Info.html"
title='struct png::Info'>Info</a></td>
<td class='docblock-short'>
<p>PNG info struct</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.OutputInfo.html"
title='struct png::OutputInfo'>OutputInfo</a></td>
<td class='docblock-short'>
<p>Output info</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.PixelDimensions.html"
title='struct png::PixelDimensions'>PixelDimensions</a></td>
<td class='docblock-short'>
<p>Pixel dimensions information</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Reader.html"
title='struct png::Reader'>Reader</a></td>
<td class='docblock-short'>
<p>PNG reader (mostly high-level interface)</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.StreamingDecoder.html"
title='struct png::StreamingDecoder'>StreamingDecoder</a></td>
<td class='docblock-short'>
<p>PNG StreamingDecoder (low-level interface)</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Transformations.html"
title='struct png::Transformations'>Transformations</a></td>
<td class='docblock-short'>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Writer.html"
title='struct png::Writer'>Writer</a></td>
<td class='docblock-short'>
<p>PNG writer</p>
</td>
</tr></table><h2 id='enums' class='section-header'><a href="#enums">Enums</a></h2>
<table>
<tr class=' module-item'>
<td><a class="enum" href="enum.BitDepth.html"
title='enum png::BitDepth'>BitDepth</a></td>
<td class='docblock-short'>
<p>Bit depth of the png file</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="enum" href="enum.ColorType.html"
title='enum png::ColorType'>ColorType</a></td>
<td class='docblock-short'>
</td>
</tr>
<tr class=' module-item'>
<td><a class="enum" href="enum.Decoded.html"
title='enum png::Decoded'>Decoded</a></td>
<td class='docblock-short'>
<p>Result of the decoding process</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="enum" href="enum.DecodingError.html"
title='enum png::DecodingError'>DecodingError</a></td>
<td class='docblock-short'>
</td>
</tr>
<tr class=' module-item'>
<td><a class="enum" href="enum.EncodingError.html"
title='enum png::EncodingError'>EncodingError</a></td>
<td class='docblock-short'>
</td>
</tr>
<tr class=' module-item'>
<td><a class="enum" href="enum.Unit.html"
title='enum png::Unit'>Unit</a></td>
<td class='docblock-short'>
<p>Physical unit of the pixel dimensions</p>
</td>
</tr></table><h2 id='constants' class='section-header'><a href="#constants">Constants</a></h2>
<table>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_BGR.html"
title='constant png::TRANSFORM_BGR'>TRANSFORM_BGR</a></td>
<td class='docblock-short'>
<p>Flip RGB to BGR; RGBA to BGRA</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_EXPAND.html"
title='constant png::TRANSFORM_EXPAND'>TRANSFORM_EXPAND</a></td>
<td class='docblock-short'>
<p>Expand paletted images to RGB; expand grayscale images of
less than 8-bit depth to 8-bit depth; and expand tRNS chunks
to alpha channels.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_EXPAND_16.html"
title='constant png::TRANSFORM_EXPAND_16'>TRANSFORM_EXPAND_16</a></td>
<td class='docblock-short'>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_GRAY_TO_RGB.html"
title='constant png::TRANSFORM_GRAY_TO_RGB'>TRANSFORM_GRAY_TO_RGB</a></td>
<td class='docblock-short'>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_IDENTITY.html"
title='constant png::TRANSFORM_IDENTITY'>TRANSFORM_IDENTITY</a></td>
<td class='docblock-short'>
<p>No transformation</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_INVERT_ALPHA.html"
title='constant png::TRANSFORM_INVERT_ALPHA'>TRANSFORM_INVERT_ALPHA</a></td>
<td class='docblock-short'>
<p>Change alpha from opacity to transparency</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_INVERT_MONO.html"
title='constant png::TRANSFORM_INVERT_MONO'>TRANSFORM_INVERT_MONO</a></td>
<td class='docblock-short'>
<p>Invert monochrome images</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_PACKING.html"
title='constant png::TRANSFORM_PACKING'>TRANSFORM_PACKING</a></td>
<td class='docblock-short'>
<p>Expand 1; 2 and 4-bit samples to bytes</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_PACKSWAP.html"
title='constant png::TRANSFORM_PACKSWAP'>TRANSFORM_PACKSWAP</a></td>
<td class='docblock-short'>
<p>Change order of packed pixels to LSB first</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_SCALE_16.html"
title='constant png::TRANSFORM_SCALE_16'>TRANSFORM_SCALE_16</a></td>
<td class='docblock-short'>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_SHIFT.html"
title='constant png::TRANSFORM_SHIFT'>TRANSFORM_SHIFT</a></td>
<td class='docblock-short'>
<p>Normalize pixels to the sBIT depth</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_STRIP_16.html"
title='constant png::TRANSFORM_STRIP_16'>TRANSFORM_STRIP_16</a></td>
<td class='docblock-short'>
<p>Strip 16-bit samples to 8 bits</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_STRIP_ALPHA.html"
title='constant png::TRANSFORM_STRIP_ALPHA'>TRANSFORM_STRIP_ALPHA</a></td>
<td class='docblock-short'>
<p>Discard the alpha channel</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_STRIP_FILLER.html"
title='constant png::TRANSFORM_STRIP_FILLER'>TRANSFORM_STRIP_FILLER</a></td>
<td class='docblock-short'>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_STRIP_FILLER_AFTER.html"
title='constant png::TRANSFORM_STRIP_FILLER_AFTER'>TRANSFORM_STRIP_FILLER_AFTER</a></td>
<td class='docblock-short'>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_STRIP_FILLER_BEFORE.html"
title='constant png::TRANSFORM_STRIP_FILLER_BEFORE'>TRANSFORM_STRIP_FILLER_BEFORE</a></td>
<td class='docblock-short'>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_SWAP_ALPHA.html"
title='constant png::TRANSFORM_SWAP_ALPHA'>TRANSFORM_SWAP_ALPHA</a></td>
<td class='docblock-short'>
<p>Flip RGBA to ARGB or GA to AG</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="constant" href="constant.TRANSFORM_SWAP_ENDIAN.html"
title='constant png::TRANSFORM_SWAP_ENDIAN'>TRANSFORM_SWAP_ENDIAN</a></td>
<td class='docblock-short'>
<p>Byte-swap 16-bit samples</p>
</td>
</tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
<table>
<tr class=' module-item'>
<td><a class="trait" href="trait.HasParameters.html"
title='trait png::HasParameters'>HasParameters</a></td>
<td class='docblock-short'>
<p>Object has parameters</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="trait" href="trait.Parameter.html"
title='trait png::Parameter'>Parameter</a></td>
<td class='docblock-short'>
<p>Configuration parameter trait</p>
</td>
</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>?</dt>
<dd>Show this help dialog</dd>
<dt>S</dt>
<dd>Focus the search field</dd>
<dt>&larrb;</dt>
<dd>Move up in search results</dd>
<dt>&rarrb;</dt>
<dd>Move down in search results</dd>
<dt>&#9166;</dt>
<dd>Go to active search result</dd>
<dt>+</dt>
<dd>Collapse/expand 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>
</div>
</div>
</aside>
<script>
window.rootPath = "../";
window.currentCrate = "png";
</script>
<script src="../main.js"></script>
<script defer src="../search-index.js"></script>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink