<!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/hdr/decoder.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>decoder.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="631">631</span>
<span id="632">632</span>
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<span id="635">635</span>
<span id="636">636</span>
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<span id="638">638</span>
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<span id="651">651</span>
<span id="652">652</span>
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<span id="656">656</span>
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<span id="661">661</span>
<span id="662">662</span>
<span id="663">663</span>
<span id="664">664</span>
<span id="665">665</span>
<span id="666">666</span>
<span id="667">667</span>
<span id="668">668</span>
<span id="669">669</span>
<span id="670">670</span>
<span id="671">671</span>
<span id="672">672</span>
<span id="673">673</span>
<span id="674">674</span>
<span id="675">675</span>
<span id="676">676</span>
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<span id="678">678</span>
<span id="679">679</span>
<span id="680">680</span>
<span id="681">681</span>
<span id="682">682</span>
<span id="683">683</span>
<span id="684">684</span>
<span id="685">685</span>
<span id="686">686</span>
<span id="687">687</span>
<span id="688">688</span>
<span id="689">689</span>
<span id="690">690</span>
<span id="691">691</span>
<span id="692">692</span>
<span id="693">693</span>
<span id="694">694</span>
<span id="695">695</span>
<span id="696">696</span>
<span id="697">697</span>
<span id="698">698</span>
<span id="699">699</span>
<span id="700">700</span>
<span id="701">701</span>
<span id="702">702</span>
<span id="703">703</span>
<span id="704">704</span>
<span id="705">705</span>
<span id="706">706</span>
<span id="707">707</span>
<span id="708">708</span>
<span id="709">709</span>
<span id="710">710</span>
<span id="711">711</span>
<span id="712">712</span>
<span id="713">713</span>
<span id="714">714</span>
<span id="715">715</span>
<span id="716">716</span>
<span id="717">717</span>
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<span id="719">719</span>
<span id="720">720</span>
<span id="721">721</span>
<span id="722">722</span>
<span id="723">723</span>
<span id="724">724</span>
<span id="725">725</span>
<span id="726">726</span>
<span id="727">727</span>
<span id="728">728</span>
<span id="729">729</span>
<span id="730">730</span>
<span id="731">731</span>
<span id="732">732</span>
<span id="733">733</span>
<span id="734">734</span>
<span id="735">735</span>
<span id="736">736</span>
<span id="737">737</span>
<span id="738">738</span>
<span id="739">739</span>
<span id="740">740</span>
<span id="741">741</span>
<span id="742">742</span>
<span id="743">743</span>
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<span id="745">745</span>
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<span id="748">748</span>
<span id="749">749</span>
<span id="750">750</span>
<span id="751">751</span>
<span id="752">752</span>
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<span id="766">766</span>
<span id="767">767</span>
<span id="768">768</span>
<span id="769">769</span>
<span id="770">770</span>
<span id="771">771</span>
<span id="772">772</span>
<span id="773">773</span>
<span id="774">774</span>
<span id="775">775</span>
<span id="776">776</span>
<span id="777">777</span>
<span id="778">778</span>
<span id="779">779</span>
<span id="780">780</span>
<span id="781">781</span>
<span id="782">782</span>
<span id="783">783</span>
<span id="784">784</span>
<span id="785">785</span>
<span id="786">786</span>
<span id="787">787</span>
<span id="788">788</span>
<span id="789">789</span>
<span id="790">790</span>
<span id="791">791</span>
<span id="792">792</span>
<span id="793">793</span>
<span id="794">794</span>
<span id="795">795</span>
<span id="796">796</span>
<span id="797">797</span>
<span id="798">798</span>
<span id="799">799</span>
<span id="800">800</span>
<span id="801">801</span>
<span id="802">802</span>
<span id="803">803</span>
<span id="804">804</span>
<span id="805">805</span>
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<span id="821">821</span>
<span id="822">822</span>
<span id="823">823</span>
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<span id="831">831</span>
<span id="832">832</span>
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<span id="834">834</span>
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<span id="837">837</span>
<span id="838">838</span>
<span id="839">839</span>
<span id="840">840</span>
<span id="841">841</span>
<span id="842">842</span>
<span id="843">843</span>
<span id="844">844</span>
<span id="845">845</span>
<span id="846">846</span>
<span id="847">847</span>
<span id="848">848</span>
<span id="849">849</span>
<span id="850">850</span>
<span id="851">851</span>
<span id="852">852</span>
<span id="853">853</span>
<span id="854">854</span>
<span id="855">855</span>
<span id="856">856</span>
<span id="857">857</span>
<span id="858">858</span>
<span id="859">859</span>
<span id="860">860</span>
<span id="861">861</span>
<span id="862">862</span>
<span id="863">863</span>
<span id="864">864</span>
<span id="865">865</span>
<span id="866">866</span>
<span id="867">867</span>
<span id="868">868</span>
<span id="869">869</span>
<span id="870">870</span>
<span id="871">871</span>
<span id="872">872</span>
<span id="873">873</span>
<span id="874">874</span>
<span id="875">875</span>
<span id="876">876</span>
<span id="877">877</span>
<span id="878">878</span>
<span id="879">879</span>
<span id="880">880</span>
<span id="881">881</span>
<span id="882">882</span>
<span id="883">883</span>
<span id="884">884</span>
<span id="885">885</span>
<span id="886">886</span>
<span id="887">887</span>
<span id="888">888</span>
<span id="889">889</span>
<span id="890">890</span>
<span id="891">891</span>
<span id="892">892</span>
<span id="893">893</span>
<span id="894">894</span>
<span id="895">895</span>
<span id="896">896</span>
<span id="897">897</span>
<span id="898">898</span>
<span id="899">899</span>
<span id="900">900</span>
<span id="901">901</span>
<span id="902">902</span>
<span id="903">903</span>
<span id="904">904</span>
<span id="905">905</span>
<span id="906">906</span>
<span id="907">907</span>
<span id="908">908</span>
<span id="909">909</span>
<span id="910">910</span>
<span id="911">911</span>
<span id="912">912</span>
<span id="913">913</span>
<span id="914">914</span>
<span id="915">915</span>
<span id="916">916</span>
<span id="917">917</span>
<span id="918">918</span>
<span id="919">919</span>
<span id="920">920</span>
<span id="921">921</span>
<span id="922">922</span>
<span id="923">923</span>
<span id="924">924</span>
<span id="925">925</span>
<span id="926">926</span>
</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">scoped_threadpool</span>::<span class="ident">Pool</span>;
<span class="kw">use</span> <span class="ident">num_traits</span>::<span class="ident">cast</span>::<span class="ident">NumCast</span>;
<span class="kw">use</span> <span class="ident">num_traits</span>::<span class="ident">identities</span>::<span class="ident">Zero</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">borrow</span>::<span class="ident">Cow</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">BufRead</span>, <span class="ident">Cursor</span>, <span class="ident">Seek</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>::<span class="ident">Iterator</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">Primitive</span>;
<span class="kw">use</span> <span class="ident">color</span>::{<span class="ident">ColorType</span>, <span class="ident">Rgb</span>};
<span class="kw">use</span> <span class="ident">image</span>::{<span class="self">self</span>, <span class="ident">ImageDecoder</span>, <span class="ident">ImageDecoderExt</span>, <span class="ident">ImageError</span>, <span class="ident">ImageResult</span>, <span class="ident">Progress</span>};
<span class="doccomment">/// Adapter to conform to ```ImageDecoder``` trait</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">HDRAdapter</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">HDRDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span><span class="op">></span>,
<span class="ident">data</span>: <span class="prelude-ty">Option</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="ident">meta</span>: <span class="ident">HDRMetadata</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">HDRAdapter</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="doccomment">/// Creates adapter</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">r</span>: <span class="ident">R</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">HDRAdapter</span><span class="op"><</span><span class="ident">R</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">HDRDecoder</span>::<span class="ident">new</span>(<span class="ident">r</span>));
<span class="kw">let</span> <span class="ident">meta</span> <span class="op">=</span> <span class="ident">decoder</span>.<span class="ident">metadata</span>();
<span class="prelude-val">Ok</span>(<span class="ident">HDRAdapter</span> {
<span class="ident">inner</span>: <span class="prelude-val">Some</span>(<span class="ident">decoder</span>),
<span class="ident">data</span>: <span class="prelude-val">None</span>,
<span class="ident">meta</span>,
})
}
<span class="doccomment">/// Allows reading old Radiance HDR images</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_nonstrict</span>(<span class="ident">r</span>: <span class="ident">R</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">HDRAdapter</span><span class="op"><</span><span class="ident">R</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">HDRDecoder</span>::<span class="ident">with_strictness</span>(<span class="ident">r</span>, <span class="bool-val">false</span>));
<span class="kw">let</span> <span class="ident">meta</span> <span class="op">=</span> <span class="ident">decoder</span>.<span class="ident">metadata</span>();
<span class="prelude-val">Ok</span>(<span class="ident">HDRAdapter</span> {
<span class="ident">inner</span>: <span class="prelude-val">Some</span>(<span class="ident">decoder</span>),
<span class="ident">data</span>: <span class="prelude-val">None</span>,
<span class="ident">meta</span>,
})
}
<span class="doccomment">/// Read the actual data of the image, and store it in Self::data.</span>
<span class="kw">fn</span> <span class="ident">read_image_data</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="ident">ImageResult</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">take</span>() {
<span class="prelude-val">Some</span>(<span class="ident">decoder</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">img</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Rgb</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span> <span class="op">=</span> <span class="ident">decoder</span>.<span class="ident">read_image_ldr</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">img</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">Rgb</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span>(); <span class="comment">// length in bytes</span>
<span class="kw">let</span> <span class="ident">target</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">get_or_insert_with</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">len</span>));
<span class="ident">target</span>.<span class="ident">clear</span>();
<span class="kw">for</span> <span class="ident">Rgb</span> { <span class="ident">data</span> } <span class="kw">in</span> <span class="ident">img</span> {
<span class="ident">target</span>.<span class="ident">extend_from_slice</span>(<span class="kw-2">&</span><span class="ident">data</span>);
}
<span class="prelude-val">Ok</span>(())
}
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">ImageEnd</span>),
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">ImageDecoder</span> <span class="kw">for</span> <span class="ident">HDRAdapter</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Reader</span> <span class="op">=</span> <span class="ident">Cursor</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="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">u64</span>, <span class="ident">u64</span>) {
(<span class="self">self</span>.<span class="ident">meta</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">u64</span>, <span class="self">self</span>.<span class="ident">meta</span>.<span class="ident">height</span> <span class="kw">as</span> <span class="ident">u64</span>)
}
<span class="kw">fn</span> <span class="ident">colortype</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ColorType</span> {
<span class="ident">ColorType</span>::<span class="ident">RGB</span>(<span class="number">8</span>)
}
<span class="kw">fn</span> <span class="ident">into_reader</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Reader</span><span class="op">></span> {
<span class="prelude-val">Ok</span>(<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">read_image</span>()<span class="question-mark">?</span>))
}
<span class="kw">fn</span> <span class="ident">read_image</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</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="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">data</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">data</span>);
}
<span class="self">self</span>.<span class="ident">read_image_data</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">unwrap</span>())
}
}
<span class="kw">impl</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">ImageDecoderExt</span> <span class="kw">for</span> <span class="ident">HDRAdapter</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">read_rect_with_progress</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">Fn</span>(<span class="ident">Progress</span>)<span class="op">></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">u64</span>,
<span class="ident">y</span>: <span class="ident">u64</span>,
<span class="ident">width</span>: <span class="ident">u64</span>,
<span class="ident">height</span>: <span class="ident">u64</span>,
<span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>],
<span class="ident">progress_callback</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">if</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">is_none</span>() {
<span class="self">self</span>.<span class="ident">read_image_data</span>()<span class="question-mark">?</span>;
}
<span class="ident">image</span>::<span class="ident">load_rect</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">buf</span>, <span class="ident">progress_callback</span>, <span class="self">self</span>, <span class="op">|</span><span class="kw">_</span>, <span class="kw">_</span><span class="op">|</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
<span class="op">|</span><span class="ident">s</span>, <span class="ident">buf</span><span class="op">|</span> {
<span class="ident">buf</span>.<span class="ident">copy_from_slice</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">s</span>.<span class="ident">data</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap</span>());
<span class="prelude-val">Ok</span>(<span class="ident">buf</span>.<span class="ident">len</span>())
})
}
}
<span class="doccomment">/// Radiance HDR file signature</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SIGNATURE</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="string">b"#?RADIANCE"</span>;
<span class="kw">const</span> <span class="ident">SIGNATURE_LENGTH</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">10</span>;
<span class="doccomment">/// An Radiance HDR decoder</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">HDRDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="ident">r</span>: <span class="ident">R</span>,
<span class="ident">width</span>: <span class="ident">u32</span>,
<span class="ident">height</span>: <span class="ident">u32</span>,
<span class="ident">meta</span>: <span class="ident">HDRMetadata</span>,
}
<span class="doccomment">/// Refer to [wikipedia](https://en.wikipedia.org/wiki/RGBE_image_format)</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">Default</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RGBE8Pixel</span> {
<span class="doccomment">/// Color components</span>
<span class="kw">pub</span> <span class="ident">c</span>: [<span class="ident">u8</span>; <span class="number">3</span>],
<span class="doccomment">/// Exponent</span>
<span class="kw">pub</span> <span class="ident">e</span>: <span class="ident">u8</span>,
}
<span class="doccomment">/// Creates ```RGBE8Pixel``` from components</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rgbe8</span>(<span class="ident">r</span>: <span class="ident">u8</span>, <span class="ident">g</span>: <span class="ident">u8</span>, <span class="ident">b</span>: <span class="ident">u8</span>, <span class="ident">e</span>: <span class="ident">u8</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RGBE8Pixel</span> {
<span class="ident">RGBE8Pixel</span> { <span class="ident">c</span>: [<span class="ident">r</span>, <span class="ident">g</span>, <span class="ident">b</span>], <span class="ident">e</span> }
}
<span class="kw">impl</span> <span class="ident">RGBE8Pixel</span> {
<span class="doccomment">/// Converts ```RGBE8Pixel``` into ```Rgb<f32>``` linearly</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_hdr</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Rgb</span><span class="op"><</span><span class="ident">f32</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">e</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="ident">Rgb</span>([<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>])
} <span class="kw">else</span> {
<span class="comment">// let exp = f32::ldexp(1., self.e as isize - (128 + 8)); // unstable</span>
<span class="kw">let</span> <span class="ident">exp</span> <span class="op">=</span> <span class="ident">f32</span>::<span class="ident">exp2</span>(<span class="op"><</span><span class="ident">f32</span> <span class="kw">as</span> <span class="ident">From</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>::<span class="ident">from</span>(<span class="self">self</span>.<span class="ident">e</span>) <span class="op">-</span> (<span class="number">128.0</span> <span class="op">+</span> <span class="number">8.0</span>));
<span class="ident">Rgb</span>([
<span class="ident">exp</span> <span class="op">*</span> <span class="op"><</span><span class="ident">f32</span> <span class="kw">as</span> <span class="ident">From</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>::<span class="ident">from</span>(<span class="self">self</span>.<span class="ident">c</span>[<span class="number">0</span>]),
<span class="ident">exp</span> <span class="op">*</span> <span class="op"><</span><span class="ident">f32</span> <span class="kw">as</span> <span class="ident">From</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>::<span class="ident">from</span>(<span class="self">self</span>.<span class="ident">c</span>[<span class="number">1</span>]),
<span class="ident">exp</span> <span class="op">*</span> <span class="op"><</span><span class="ident">f32</span> <span class="kw">as</span> <span class="ident">From</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>::<span class="ident">from</span>(<span class="self">self</span>.<span class="ident">c</span>[<span class="number">2</span>]),
])
}
}
<span class="doccomment">/// Converts ```RGBE8Pixel``` into ```Rgb<T>``` with scale=1 and gamma=2.2</span>
<span class="doccomment">///</span>
<span class="doccomment">/// color_ldr = (color_hdr*scale)<sup>gamma</sup></span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panic</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics when ```T::max_value()``` cannot be represented as f32.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_ldr</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Primitive</span> <span class="op">+</span> <span class="ident">Zero</span><span class="op">></span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Rgb</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">to_ldr_scale_gamma</span>(<span class="number">1.0</span>, <span class="number">2.2</span>)
}
<span class="doccomment">/// Converts RGBE8Pixel into Rgb<T> using provided scale and gamma</span>
<span class="doccomment">///</span>
<span class="doccomment">/// color_ldr = (color_hdr*scale)<sup>gamma</sup></span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panic</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics when T::max_value() cannot be represented as f32.</span>
<span class="doccomment">/// Panics when scale or gamma is NaN</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_ldr_scale_gamma</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Primitive</span> <span class="op">+</span> <span class="ident">Zero</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">scale</span>: <span class="ident">f32</span>, <span class="ident">gamma</span>: <span class="ident">f32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Rgb</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">Rgb</span> { <span class="ident">data</span> } <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_hdr</span>();
<span class="kw">let</span> (<span class="ident">r</span>, <span class="ident">g</span>, <span class="ident">b</span>) <span class="op">=</span> (<span class="ident">data</span>[<span class="number">0</span>], <span class="ident">data</span>[<span class="number">1</span>], <span class="ident">data</span>[<span class="number">2</span>]);
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">sg</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Primitive</span> <span class="op">+</span> <span class="ident">Zero</span><span class="op">></span>(<span class="ident">v</span>: <span class="ident">f32</span>, <span class="ident">scale</span>: <span class="ident">f32</span>, <span class="ident">gamma</span>: <span class="ident">f32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">T</span> {
<span class="kw">let</span> <span class="ident">t_max</span> <span class="op">=</span> <span class="ident">T</span>::<span class="ident">max_value</span>();
<span class="comment">// Disassembly shows that t_max_f32 is compiled into constant</span>
<span class="kw">let</span> <span class="ident">t_max_f32</span>: <span class="ident">f32</span> <span class="op">=</span> <span class="ident">NumCast</span>::<span class="ident">from</span>(<span class="ident">t_max</span>)
.<span class="ident">expect</span>(<span class="string">"to_ldr_scale_gamma: maximum value of type is not representable as f32"</span>);
<span class="kw">let</span> <span class="ident">fv</span> <span class="op">=</span> <span class="ident">f32</span>::<span class="ident">powf</span>(<span class="ident">v</span> <span class="op">*</span> <span class="ident">scale</span>, <span class="ident">gamma</span>) <span class="op">*</span> <span class="ident">t_max_f32</span> <span class="op">+</span> <span class="number">0.5</span>;
<span class="kw">if</span> <span class="ident">fv</span> <span class="op"><</span> <span class="number">0.0</span> {
<span class="ident">T</span>::<span class="ident">zero</span>()
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">fv</span> <span class="op">></span> <span class="ident">t_max_f32</span> {
<span class="ident">t_max</span>
} <span class="kw">else</span> {
<span class="ident">NumCast</span>::<span class="ident">from</span>(<span class="ident">fv</span>)
.<span class="ident">expect</span>(<span class="string">"to_ldr_scale_gamma: cannot convert f32 to target type. NaN?"</span>)
}
}
<span class="ident">Rgb</span>([
<span class="ident">sg</span>(<span class="ident">r</span>, <span class="ident">scale</span>, <span class="ident">gamma</span>),
<span class="ident">sg</span>(<span class="ident">g</span>, <span class="ident">scale</span>, <span class="ident">gamma</span>),
<span class="ident">sg</span>(<span class="ident">b</span>, <span class="ident">scale</span>, <span class="ident">gamma</span>),
])
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">HDRDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="doccomment">/// Reads Radiance HDR image header from stream ```r```</span>
<span class="doccomment">/// if the header is valid, creates HDRDecoder</span>
<span class="doccomment">/// strict mode is enabled</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">reader</span>: <span class="ident">R</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">HDRDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span><span class="op">></span> {
<span class="ident">HDRDecoder</span>::<span class="ident">with_strictness</span>(<span class="ident">reader</span>, <span class="bool-val">true</span>)
}
<span class="doccomment">/// Reads Radiance HDR image header from stream ```reader```,</span>
<span class="doccomment">/// if the header is valid, creates ```HDRDecoder```.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// strict enables strict mode</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Warning! Reading wrong file in non-strict mode</span>
<span class="doccomment">/// could consume file size worth of memory in the process.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_strictness</span>(<span class="kw-2">mut</span> <span class="ident">reader</span>: <span class="ident">R</span>, <span class="ident">strict</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">HDRDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">attributes</span> <span class="op">=</span> <span class="ident">HDRMetadata</span>::<span class="ident">new</span>();
{
<span class="comment">// scope to make borrowck happy</span>
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">reader</span>;
<span class="kw">if</span> <span class="ident">strict</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">signature</span> <span class="op">=</span> [<span class="number">0</span>; <span class="ident">SIGNATURE_LENGTH</span>];
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">signature</span>));
<span class="kw">if</span> <span class="ident">signature</span> <span class="op">!</span><span class="op">=</span> <span class="ident">SIGNATURE</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Radiance HDR signature not found"</span>.<span class="ident">to_string</span>(),
));
} <span class="comment">// no else</span>
<span class="comment">// skip signature line ending</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_line_u8</span>(<span class="ident">r</span>));
} <span class="kw">else</span> {
<span class="comment">// Old Radiance HDR files (*.pic) don't use signature</span>
<span class="comment">// Let them be parsed in non-strict mode</span>
}
<span class="comment">// read header data until empty line</span>
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_line_u8</span>(<span class="ident">r</span>)) {
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// EOF before end of header</span>
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="string">"EOF in header"</span>.<span class="ident">into</span>()));
}
<span class="prelude-val">Some</span>(<span class="ident">line</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">line</span>.<span class="ident">is_empty</span>() {
<span class="comment">// end of header</span>
<span class="kw">break</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">line</span>[<span class="number">0</span>] <span class="op">=</span><span class="op">=</span> <span class="string">b'#'</span> {
<span class="comment">// line[0] will not panic, line.len() == 0 is false here</span>
<span class="comment">// skip comments</span>
<span class="kw">continue</span>;
} <span class="comment">// no else</span>
<span class="comment">// process attribute line</span>
<span class="kw">let</span> <span class="ident">line</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from_utf8_lossy</span>(<span class="kw-2">&</span><span class="ident">line</span>[..]);
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">attributes</span>.<span class="ident">update_header_info</span>(<span class="kw-2">&</span><span class="ident">line</span>, <span class="ident">strict</span>));
} <span class="comment">// <= Some(line)</span>
} <span class="comment">// match read_line_u8()</span>
} <span class="comment">// loop</span>
} <span class="comment">// scope to end borrow of reader</span>
<span class="comment">// parse dimensions</span>
<span class="kw">let</span> (<span class="ident">width</span>, <span class="ident">height</span>) <span class="op">=</span> <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_line_u8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">reader</span>)) {
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// EOF instead of image dimensions</span>
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="string">"EOF in dimensions line"</span>.<span class="ident">into</span>()));
}
<span class="prelude-val">Some</span>(<span class="ident">dimensions</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">dimensions</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from_utf8_lossy</span>(<span class="kw-2">&</span><span class="ident">dimensions</span>[..]);
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">parse_dimensions_line</span>(<span class="kw-2">&</span><span class="ident">dimensions</span>, <span class="ident">strict</span>))
}
};
<span class="prelude-val">Ok</span>(<span class="ident">HDRDecoder</span> {
<span class="ident">r</span>: <span class="ident">reader</span>,
<span class="ident">width</span>,
<span class="ident">height</span>,
<span class="ident">meta</span>: <span class="ident">HDRMetadata</span> {
<span class="ident">width</span>,
<span class="ident">height</span>,
..<span class="ident">attributes</span>
},
})
} <span class="comment">// end with_strictness</span>
<span class="doccomment">/// Returns file metadata. Refer to ```HDRMetadata``` for details.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">metadata</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">HDRMetadata</span> {
<span class="self">self</span>.<span class="ident">meta</span>.<span class="ident">clone</span>()
}
<span class="doccomment">/// Consumes decoder and returns a vector of RGBE8 pixels</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read_image_native</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">RGBE8Pixel</span><span class="op">></span><span class="op">></span> {
<span class="comment">// Don't read anything if image is empty</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">width</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">height</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="macro">vec</span><span class="macro">!</span>[]);
}
<span class="comment">// expression self.width > 0 && self.height > 0 is true from now to the end of this method</span>
<span class="kw">let</span> <span class="ident">pixel_count</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">height</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Default</span>::<span class="ident">default</span>(); <span class="ident">pixel_count</span>];
<span class="kw">for</span> <span class="ident">chunk</span> <span class="kw">in</span> <span class="ident">ret</span>.<span class="ident">chunks_mut</span>(<span class="self">self</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span>) {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_scanline</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">r</span>, <span class="ident">chunk</span>));
}
<span class="prelude-val">Ok</span>(<span class="ident">ret</span>)
}
<span class="doccomment">/// Consumes decoder and returns a vector of transformed pixels</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read_image_transform</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span>, <span class="ident">F</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Fn</span>(<span class="ident">RGBE8Pixel</span>) <span class="op">-</span><span class="op">></span> <span class="ident">T</span><span class="op">></span>(
<span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">f</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="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> {
<span class="comment">// Don't read anything if image is empty</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">width</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">height</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="macro">vec</span><span class="macro">!</span>[]);
}
<span class="comment">// expression self.width > 0 && self.height > 0 is true from now to the end of this method</span>
<span class="comment">// scanline buffer</span>
<span class="kw">let</span> <span class="ident">uszwidth</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">pixel_count</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">height</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">pixel_count</span>);
<span class="kw">unsafe</span> {
<span class="comment">// RGBE8Pixel doesn't implement Drop, so it's Ok to drop half-initialized ret</span>
<span class="ident">ret</span>.<span class="ident">set_len</span>(<span class="ident">pixel_count</span>);
} <span class="comment">// ret contains uninitialized data, so now it's my responsibility to return fully initialized ret</span>
{
<span class="kw">let</span> <span class="ident">chunks_iter</span> <span class="op">=</span> <span class="ident">ret</span>.<span class="ident">chunks_mut</span>(<span class="ident">uszwidth</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pool</span> <span class="op">=</span> <span class="ident">Pool</span>::<span class="ident">new</span>(<span class="number">8</span>); <span class="comment">//</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">pool</span>.<span class="ident">scoped</span>(<span class="op">|</span><span class="ident">scope</span><span class="op">|</span> {
<span class="kw">for</span> <span class="ident">chunk</span> <span class="kw">in</span> <span class="ident">chunks_iter</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="op"><</span><span class="ident">RGBE8Pixel</span><span class="op">></span>::<span class="ident">with_capacity</span>(<span class="ident">uszwidth</span>);
<span class="kw">unsafe</span> {
<span class="ident">buf</span>.<span class="ident">set_len</span>(<span class="ident">uszwidth</span>);
}
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_scanline</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">r</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>[..]));
<span class="kw">let</span> <span class="ident">f</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">f</span>;
<span class="ident">scope</span>.<span class="ident">execute</span>(<span class="kw">move</span> <span class="op">|</span><span class="op">|</span> {
<span class="kw">for</span> (<span class="ident">dst</span>, <span class="kw-2">&</span><span class="ident">pix</span>) <span class="kw">in</span> <span class="ident">chunk</span>.<span class="ident">iter_mut</span>().<span class="ident">zip</span>(<span class="ident">buf</span>.<span class="ident">iter</span>()) {
<span class="kw-2">*</span><span class="ident">dst</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">pix</span>);
}
});
}
<span class="prelude-val">Ok</span>(())
}) <span class="kw">as</span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">ImageError</span><span class="op">></span>);
}
<span class="prelude-val">Ok</span>(<span class="ident">ret</span>)
}
<span class="doccomment">/// Consumes decoder and returns a vector of Rgb<u8> pixels.</span>
<span class="doccomment">/// scale = 1, gamma = 2.2</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read_image_ldr</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Rgb</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">read_image_transform</span>(<span class="op">|</span><span class="ident">pix</span><span class="op">|</span> <span class="ident">pix</span>.<span class="ident">to_ldr</span>())
}
<span class="doccomment">/// Consumes decoder and returns a vector of Rgb<f32> pixels.</span>
<span class="doccomment">///</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read_image_hdr</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Rgb</span><span class="op"><</span><span class="ident">f32</span><span class="op">></span><span class="op">></span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">read_image_transform</span>(<span class="op">|</span><span class="ident">pix</span><span class="op">|</span> <span class="ident">pix</span>.<span class="ident">to_hdr</span>())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">HDRDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">RGBE8Pixel</span><span class="op">></span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">HDRImageDecoderIterator</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>::<span class="ident">IntoIter</span> {
<span class="ident">HDRImageDecoderIterator</span> {
<span class="ident">r</span>: <span class="self">self</span>.<span class="ident">r</span>,
<span class="ident">scanline_cnt</span>: <span class="self">self</span>.<span class="ident">height</span> <span class="kw">as</span> <span class="ident">usize</span>,
<span class="ident">buf</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Default</span>::<span class="ident">default</span>(); <span class="self">self</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span>],
<span class="ident">col</span>: <span class="number">0</span>,
<span class="ident">scanline</span>: <span class="number">0</span>,
<span class="ident">trouble</span>: <span class="bool-val">true</span>, <span class="comment">// make first call to `next()` read scanline</span>
<span class="ident">error_encountered</span>: <span class="bool-val">false</span>,
}
}
}
<span class="doccomment">/// Scanline buffered pixel by pixel iterator</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">HDRImageDecoderIterator</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span> {
<span class="ident">r</span>: <span class="ident">R</span>,
<span class="ident">scanline_cnt</span>: <span class="ident">usize</span>,
<span class="ident">buf</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">RGBE8Pixel</span><span class="op">></span>, <span class="comment">// scanline buffer</span>
<span class="ident">col</span>: <span class="ident">usize</span>, <span class="comment">// current position in scanline</span>
<span class="ident">scanline</span>: <span class="ident">usize</span>, <span class="comment">// current scanline</span>
<span class="ident">trouble</span>: <span class="ident">bool</span>, <span class="comment">// optimization, true indicates that we need to check something</span>
<span class="ident">error_encountered</span>: <span class="ident">bool</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">HDRImageDecoderIterator</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="comment">// Advances counter to the next pixel</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">advance</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">col</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">col</span> <span class="op">=</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">len</span>() {
<span class="self">self</span>.<span class="ident">col</span> <span class="op">=</span> <span class="number">0</span>;
<span class="self">self</span>.<span class="ident">scanline</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<span class="self">self</span>.<span class="ident">trouble</span> <span class="op">=</span> <span class="bool-val">true</span>;
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">HDRImageDecoderIterator</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">RGBE8Pixel</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">next</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="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">trouble</span> {
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buf</span>[<span class="self">self</span>.<span class="ident">col</span>];
<span class="self">self</span>.<span class="ident">advance</span>();
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">ret</span>))
} <span class="kw">else</span> {
<span class="comment">// some condition is pending</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">is_empty</span>() <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">scanline</span> <span class="op">=</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">scanline_cnt</span> {
<span class="comment">// No more pixels</span>
<span class="kw">return</span> <span class="prelude-val">None</span>;
} <span class="comment">// no else</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">error_encountered</span> {
<span class="self">self</span>.<span class="ident">advance</span>();
<span class="comment">// Error was encountered. Keep producing errors.</span>
<span class="comment">// ImageError can't implement Clone, so just dump some error</span>
<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">ImageEnd</span>));
} <span class="comment">// no else</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">col</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="comment">// fill scanline buffer</span>
<span class="kw">match</span> <span class="ident">read_scanline</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">r</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">buf</span>[..]) {
<span class="prelude-val">Ok</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// no action required</span>
}
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">advance</span>();
<span class="self">self</span>.<span class="ident">error_encountered</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="self">self</span>.<span class="ident">trouble</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">err</span>));
}
}
} <span class="comment">// no else</span>
<span class="self">self</span>.<span class="ident">trouble</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buf</span>[<span class="number">0</span>];
<span class="self">self</span>.<span class="ident">advance</span>();
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">ret</span>))
}
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="kw">let</span> <span class="ident">total_cnt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="self">self</span>.<span class="ident">scanline_cnt</span>;
<span class="kw">let</span> <span class="ident">cur_cnt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="self">self</span>.<span class="ident">scanline</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">col</span>;
<span class="kw">let</span> <span class="ident">remaining</span> <span class="op">=</span> <span class="ident">total_cnt</span> <span class="op">-</span> <span class="ident">cur_cnt</span>;
(<span class="ident">remaining</span>, <span class="prelude-val">Some</span>(<span class="ident">remaining</span>))
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">HDRImageDecoderIterator</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {}
<span class="comment">// Precondition: buf.len() > 0</span>
<span class="kw">fn</span> <span class="ident">read_scanline</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span>(<span class="ident">r</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">RGBE8Pixel</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span>()<span class="op">></span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">buf</span>.<span class="ident">is_empty</span>());
<span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>();
<span class="comment">// first 4 bytes in scanline allow to determine compression method</span>
<span class="kw">let</span> <span class="ident">fb</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_rgbe</span>(<span class="ident">r</span>));
<span class="kw">if</span> <span class="ident">fb</span>.<span class="ident">c</span>[<span class="number">0</span>] <span class="op">=</span><span class="op">=</span> <span class="number">2</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">fb</span>.<span class="ident">c</span>[<span class="number">1</span>] <span class="op">=</span><span class="op">=</span> <span class="number">2</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">fb</span>.<span class="ident">c</span>[<span class="number">2</span>] <span class="op"><</span> <span class="number">128</span> {
<span class="comment">// denormalized pixel value (2,2,<128,_) indicates new per component RLE method</span>
<span class="comment">// decode_component guarantees that offset is within 0 .. width</span>
<span class="comment">// therefore we can skip bounds checking here, but we will not</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">decode_component</span>(<span class="ident">r</span>, <span class="ident">width</span>, <span class="op">|</span><span class="ident">offset</span>, <span class="ident">value</span><span class="op">|</span> <span class="ident">buf</span>[<span class="ident">offset</span>].<span class="ident">c</span>[<span class="number">0</span>] <span class="op">=</span> <span class="ident">value</span>));
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">decode_component</span>(<span class="ident">r</span>, <span class="ident">width</span>, <span class="op">|</span><span class="ident">offset</span>, <span class="ident">value</span><span class="op">|</span> <span class="ident">buf</span>[<span class="ident">offset</span>].<span class="ident">c</span>[<span class="number">1</span>] <span class="op">=</span> <span class="ident">value</span>));
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">decode_component</span>(<span class="ident">r</span>, <span class="ident">width</span>, <span class="op">|</span><span class="ident">offset</span>, <span class="ident">value</span><span class="op">|</span> <span class="ident">buf</span>[<span class="ident">offset</span>].<span class="ident">c</span>[<span class="number">2</span>] <span class="op">=</span> <span class="ident">value</span>));
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">decode_component</span>(<span class="ident">r</span>, <span class="ident">width</span>, <span class="op">|</span><span class="ident">offset</span>, <span class="ident">value</span><span class="op">|</span> <span class="ident">buf</span>[<span class="ident">offset</span>].<span class="ident">e</span> <span class="op">=</span> <span class="ident">value</span>));
} <span class="kw">else</span> {
<span class="comment">// old RLE method (it was considered old around 1991, should it be here?)</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">decode_old_rle</span>(<span class="ident">r</span>, <span class="ident">fb</span>, <span class="ident">buf</span>));
}
<span class="prelude-val">Ok</span>(())
}
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">fn</span> <span class="ident">read_byte</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span>(<span class="ident">r</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</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="ident">u8</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0u8</span>];
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>[..]));
<span class="prelude-val">Ok</span>(<span class="ident">buf</span>[<span class="number">0</span>])
}
<span class="comment">// Guarantees that first parameter of set_component will be within pos .. pos+width</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">decode_component</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span>, <span class="ident">S</span>: <span class="ident">FnMut</span>(<span class="ident">usize</span>, <span class="ident">u8</span>)<span class="op">></span>(
<span class="ident">r</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</span>,
<span class="ident">width</span>: <span class="ident">usize</span>,
<span class="kw-2">mut</span> <span class="ident">set_component</span>: <span class="ident">S</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">buf</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">128</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pos</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="ident">pos</span> <span class="op"><</span> <span class="ident">width</span> {
<span class="comment">// increment position by a number of decompressed values</span>
<span class="ident">pos</span> <span class="op">+</span><span class="op">=</span> {
<span class="kw">let</span> <span class="ident">rl</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_byte</span>(<span class="ident">r</span>));
<span class="kw">if</span> <span class="ident">rl</span> <span class="op"><</span><span class="op">=</span> <span class="number">128</span> {
<span class="comment">// sanity check</span>
<span class="kw">if</span> <span class="ident">pos</span> <span class="op">+</span> <span class="ident">rl</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">></span> <span class="ident">width</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Wrong length of decoded scanline"</span>.<span class="ident">into</span>(),
));
}
<span class="comment">// read values</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>[<span class="number">0</span>..<span class="ident">rl</span> <span class="kw">as</span> <span class="ident">usize</span>]));
<span class="kw">for</span> (<span class="ident">offset</span>, <span class="kw-2">&</span><span class="ident">value</span>) <span class="kw">in</span> <span class="ident">buf</span>[<span class="number">0</span>..<span class="ident">rl</span> <span class="kw">as</span> <span class="ident">usize</span>].<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
<span class="ident">set_component</span>(<span class="ident">pos</span> <span class="op">+</span> <span class="ident">offset</span>, <span class="ident">value</span>);
}
<span class="ident">rl</span> <span class="kw">as</span> <span class="ident">usize</span>
} <span class="kw">else</span> {
<span class="comment">// run</span>
<span class="kw">let</span> <span class="ident">rl</span> <span class="op">=</span> <span class="ident">rl</span> <span class="op">-</span> <span class="number">128</span>;
<span class="comment">// sanity check</span>
<span class="kw">if</span> <span class="ident">pos</span> <span class="op">+</span> <span class="ident">rl</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">></span> <span class="ident">width</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Wrong length of decoded scanline"</span>.<span class="ident">into</span>(),
));
}
<span class="comment">// fill with same value</span>
<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_byte</span>(<span class="ident">r</span>));
<span class="kw">for</span> <span class="ident">offset</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">rl</span> <span class="kw">as</span> <span class="ident">usize</span> {
<span class="ident">set_component</span>(<span class="ident">pos</span> <span class="op">+</span> <span class="ident">offset</span>, <span class="ident">value</span>);
}
<span class="ident">rl</span> <span class="kw">as</span> <span class="ident">usize</span>
}
};
}
<span class="kw">if</span> <span class="ident">pos</span> <span class="op">!</span><span class="op">=</span> <span class="ident">width</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Wrong length of decoded scanline"</span>.<span class="ident">into</span>(),
));
}
<span class="prelude-val">Ok</span>(())
}
<span class="comment">// Decodes scanline, places it into buf</span>
<span class="comment">// Precondition: buf.len() > 0</span>
<span class="comment">// fb - first 4 bytes of scanline</span>
<span class="kw">fn</span> <span class="ident">decode_old_rle</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span>(
<span class="ident">r</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</span>,
<span class="ident">fb</span>: <span class="ident">RGBE8Pixel</span>,
<span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">RGBE8Pixel</span>],
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span>()<span class="op">></span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">buf</span>.<span class="ident">is_empty</span>());
<span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>();
<span class="comment">// convenience function.</span>
<span class="comment">// returns run length if pixel is a run length marker</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">rl_marker</span>(<span class="ident">pix</span>: <span class="ident">RGBE8Pixel</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">pix</span>.<span class="ident">c</span> <span class="op">=</span><span class="op">=</span> [<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>] {
<span class="prelude-val">Some</span>(<span class="ident">pix</span>.<span class="ident">e</span> <span class="kw">as</span> <span class="ident">usize</span>)
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
<span class="comment">// first pixel in scanline should not be run length marker</span>
<span class="comment">// it is error if it is</span>
<span class="kw">if</span> <span class="ident">rl_marker</span>(<span class="ident">fb</span>).<span class="ident">is_some</span>() {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"First pixel of a scanline shouldn't be run length marker"</span>.<span class="ident">into</span>(),
));
}
<span class="ident">buf</span>[<span class="number">0</span>] <span class="op">=</span> <span class="ident">fb</span>; <span class="comment">// set first pixel of scanline</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x_off</span> <span class="op">=</span> <span class="number">1</span>; <span class="comment">// current offset from beginning of a scanline</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rl_mult</span> <span class="op">=</span> <span class="number">1</span>; <span class="comment">// current run length multiplier</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prev_pixel</span> <span class="op">=</span> <span class="ident">fb</span>;
<span class="kw">while</span> <span class="ident">x_off</span> <span class="op"><</span> <span class="ident">width</span> {
<span class="kw">let</span> <span class="ident">pix</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">read_rgbe</span>(<span class="ident">r</span>));
<span class="comment">// it's harder to forget to increase x_off if I write this this way.</span>
<span class="ident">x_off</span> <span class="op">+</span><span class="op">=</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">rl</span>) <span class="op">=</span> <span class="ident">rl_marker</span>(<span class="ident">pix</span>) {
<span class="comment">// rl_mult takes care of consecutive RL markers</span>
<span class="kw">let</span> <span class="ident">rl</span> <span class="op">=</span> <span class="ident">rl</span> <span class="op">*</span> <span class="ident">rl_mult</span>;
<span class="ident">rl_mult</span> <span class="kw-2">*</span><span class="op">=</span> <span class="number">256</span>;
<span class="kw">if</span> <span class="ident">x_off</span> <span class="op">+</span> <span class="ident">rl</span> <span class="op"><</span><span class="op">=</span> <span class="ident">width</span> {
<span class="comment">// do run</span>
<span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>[<span class="ident">x_off</span>..<span class="ident">x_off</span> <span class="op">+</span> <span class="ident">rl</span>] {
<span class="kw-2">*</span><span class="ident">b</span> <span class="op">=</span> <span class="ident">prev_pixel</span>;
}
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Wrong length of decoded scanline"</span>.<span class="ident">into</span>(),
));
};
<span class="ident">rl</span> <span class="comment">// value to increase x_off by</span>
} <span class="kw">else</span> {
<span class="ident">rl_mult</span> <span class="op">=</span> <span class="number">1</span>; <span class="comment">// chain of consecutive RL markers is broken</span>
<span class="ident">prev_pixel</span> <span class="op">=</span> <span class="ident">pix</span>;
<span class="ident">buf</span>[<span class="ident">x_off</span>] <span class="op">=</span> <span class="ident">pix</span>;
<span class="number">1</span> <span class="comment">// value to increase x_off by</span>
}
};
}
<span class="kw">if</span> <span class="ident">x_off</span> <span class="op">!</span><span class="op">=</span> <span class="ident">width</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Wrong length of decoded scanline"</span>.<span class="ident">into</span>(),
));
}
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn</span> <span class="ident">read_rgbe</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span>(<span class="ident">r</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</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="ident">RGBE8Pixel</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0u8</span>; <span class="number">4</span>];
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>[..]));
<span class="prelude-val">Ok</span>(<span class="ident">RGBE8Pixel</span> {<span class="ident">c</span>: [<span class="ident">buf</span>[<span class="number">0</span>], <span class="ident">buf</span>[<span class="number">1</span>], <span class="ident">buf</span>[<span class="number">2</span>]], <span class="ident">e</span>: <span class="ident">buf</span>[<span class="number">3</span>] })
}
<span class="doccomment">/// Metadata for Radiance HDR image</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">HDRMetadata</span> {
<span class="doccomment">/// Width of decoded image. It could be either scanline length,</span>
<span class="doccomment">/// or scanline count, depending on image orientation.</span>
<span class="kw">pub</span> <span class="ident">width</span>: <span class="ident">u32</span>,
<span class="doccomment">/// Height of decoded image. It depends on orientation too.</span>
<span class="kw">pub</span> <span class="ident">height</span>: <span class="ident">u32</span>,
<span class="doccomment">/// Orientation matrix. For standard orientation it is ((1,0),(0,1)) - left to right, top to bottom.</span>
<span class="doccomment">/// First pair tells how resulting pixel coordinates change along a scanline.</span>
<span class="doccomment">/// Second pair tells how they change from one scanline to the next.</span>
<span class="kw">pub</span> <span class="ident">orientation</span>: ((<span class="ident">i8</span>, <span class="ident">i8</span>), (<span class="ident">i8</span>, <span class="ident">i8</span>)),
<span class="doccomment">/// Divide color values by exposure to get to get physical radiance in</span>
<span class="doccomment">/// watts/steradian/m<sup>2</sup></span>
<span class="doccomment">///</span>
<span class="doccomment">/// Image may not contain physical data, even if this field is set.</span>
<span class="kw">pub</span> <span class="ident">exposure</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">f32</span><span class="op">></span>,
<span class="doccomment">/// Divide color values by corresponding tuple member (r, g, b) to get to get physical radiance</span>
<span class="doccomment">/// in watts/steradian/m<sup>2</sup></span>
<span class="doccomment">///</span>
<span class="doccomment">/// Image may not contain physical data, even if this field is set.</span>
<span class="kw">pub</span> <span class="ident">color_correction</span>: <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">f32</span>, <span class="ident">f32</span>, <span class="ident">f32</span>)<span class="op">></span>,
<span class="doccomment">/// Pixel height divided by pixel width</span>
<span class="kw">pub</span> <span class="ident">pixel_aspect_ratio</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">f32</span><span class="op">></span>,
<span class="doccomment">/// All lines contained in image header are put here. Ordering of lines is preserved.</span>
<span class="doccomment">/// Lines in the form "key=value" are represented as ("key", "value").</span>
<span class="doccomment">/// All other lines are ("", "line")</span>
<span class="kw">pub</span> <span class="ident">custom_attributes</span>: <span class="ident">Vec</span><span class="op"><</span>(<span class="ident">String</span>, <span class="ident">String</span>)<span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">HDRMetadata</span> {
<span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">HDRMetadata</span> {
<span class="ident">HDRMetadata</span> {
<span class="ident">width</span>: <span class="number">0</span>,
<span class="ident">height</span>: <span class="number">0</span>,
<span class="ident">orientation</span>: ((<span class="number">1</span>, <span class="number">0</span>), (<span class="number">0</span>, <span class="number">1</span>)),
<span class="ident">exposure</span>: <span class="prelude-val">None</span>,
<span class="ident">color_correction</span>: <span class="prelude-val">None</span>,
<span class="ident">pixel_aspect_ratio</span>: <span class="prelude-val">None</span>,
<span class="ident">custom_attributes</span>: <span class="macro">vec</span><span class="macro">!</span>[],
}
}
<span class="comment">// Updates header info, in strict mode returns error for malformed lines (no '=' separator)</span>
<span class="comment">// unknown attributes are skipped</span>
<span class="kw">fn</span> <span class="ident">update_header_info</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">line</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">strict</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span>()<span class="op">></span> {
<span class="comment">// split line at first '='</span>
<span class="comment">// old Radiance HDR files (*.pic) feature tabs in key, so vvv trim</span>
<span class="kw">let</span> <span class="ident">maybe_key_value</span> <span class="op">=</span> <span class="ident">split_at_first</span>(<span class="ident">line</span>, <span class="string">"="</span>).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">key</span>, <span class="ident">value</span>)<span class="op">|</span> (<span class="ident">key</span>.<span class="ident">trim</span>(), <span class="ident">value</span>));
<span class="comment">// save all header lines in custom_attributes</span>
<span class="kw">match</span> <span class="ident">maybe_key_value</span> {
<span class="prelude-val">Some</span>((<span class="ident">key</span>, <span class="ident">val</span>)) <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">custom_attributes</span>
.<span class="ident">push</span>((<span class="ident">key</span>.<span class="ident">to_owned</span>(), <span class="ident">val</span>.<span class="ident">to_owned</span>())),
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">custom_attributes</span>.<span class="ident">push</span>((<span class="string">""</span>.<span class="ident">into</span>(), <span class="ident">line</span>.<span class="ident">to_owned</span>())),
}
<span class="comment">// parse known attributes</span>
<span class="kw">match</span> <span class="ident">maybe_key_value</span> {
<span class="prelude-val">Some</span>((<span class="string">"FORMAT"</span>, <span class="ident">val</span>)) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">val</span>.<span class="ident">trim</span>() <span class="op">!</span><span class="op">=</span> <span class="string">"32-bit_rle_rgbe"</span> {
<span class="comment">// XYZE isn't supported yet</span>
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">UnsupportedError</span>(<span class="ident">limit_string_len</span>(<span class="ident">val</span>, <span class="number">20</span>)));
}
}
<span class="prelude-val">Some</span>((<span class="string">"EXPOSURE"</span>, <span class="ident">val</span>)) <span class="op">=</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">val</span>.<span class="ident">trim</span>().<span class="ident">parse</span>::<span class="op"><</span><span class="ident">f32</span><span class="op">></span>() {
<span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">exposure</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">exposure</span>.<span class="ident">unwrap_or</span>(<span class="number">1.0</span>) <span class="op">*</span> <span class="ident">v</span>); <span class="comment">// all encountered exposure values should be multiplied</span>
}
<span class="prelude-val">Err</span>(<span class="ident">parse_error</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">strict</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="macro">format</span><span class="macro">!</span>(
<span class="string">"Cannot parse EXPOSURE value: {}"</span>,
<span class="ident">parse_error</span>.<span class="ident">description</span>()
)));
} <span class="comment">// no else, skip this line in non-strict mode</span>
}
};
}
<span class="prelude-val">Some</span>((<span class="string">"PIXASPECT"</span>, <span class="ident">val</span>)) <span class="op">=</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">val</span>.<span class="ident">trim</span>().<span class="ident">parse</span>::<span class="op"><</span><span class="ident">f32</span><span class="op">></span>() {
<span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">pixel_aspect_ratio</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">pixel_aspect_ratio</span>.<span class="ident">unwrap_or</span>(<span class="number">1.0</span>) <span class="op">*</span> <span class="ident">v</span>); <span class="comment">// all encountered exposure values should be multiplied</span>
}
<span class="prelude-val">Err</span>(<span class="ident">parse_error</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">strict</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="macro">format</span><span class="macro">!</span>(
<span class="string">"Cannot parse PIXASPECT value: {}"</span>,
<span class="ident">parse_error</span>.<span class="ident">description</span>()
)));
} <span class="comment">// no else, skip this line in non-strict mode</span>
}
};
}
<span class="prelude-val">Some</span>((<span class="string">"COLORCORR"</span>, <span class="ident">val</span>)) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rgbcorr</span> <span class="op">=</span> [<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>];
<span class="kw">match</span> <span class="ident">parse_space_separated_f32</span>(<span class="ident">val</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">rgbcorr</span>, <span class="string">"COLORCORR"</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">extra_numbers</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">strict</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">extra_numbers</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Extra numbers in COLORCORR"</span>.<span class="ident">into</span>(),
));
} <span class="comment">// no else, just ignore extra numbers</span>
<span class="kw">let</span> (<span class="ident">rc</span>, <span class="ident">gc</span>, <span class="ident">bc</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">color_correction</span>.<span class="ident">unwrap_or</span>((<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>));
<span class="self">self</span>.<span class="ident">color_correction</span> <span class="op">=</span>
<span class="prelude-val">Some</span>((<span class="ident">rc</span> <span class="op">*</span> <span class="ident">rgbcorr</span>[<span class="number">0</span>], <span class="ident">gc</span> <span class="op">*</span> <span class="ident">rgbcorr</span>[<span class="number">1</span>], <span class="ident">bc</span> <span class="op">*</span> <span class="ident">rgbcorr</span>[<span class="number">2</span>]));
}
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">strict</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>);
} <span class="comment">// no else, skip malformed line in non-strict mode</span>
}
}
}
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// old Radiance HDR files (*.pic) contain commands in a header</span>
<span class="comment">// just skip them</span>
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// skip unknown attribute</span>
}
} <span class="comment">// match attributes</span>
<span class="prelude-val">Ok</span>(())
}
}
<span class="kw">fn</span> <span class="ident">parse_space_separated_f32</span>(<span class="ident">line</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">vals</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">f32</span>], <span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">nums</span> <span class="op">=</span> <span class="ident">line</span>.<span class="ident">split_whitespace</span>();
<span class="kw">for</span> <span class="ident">val</span> <span class="kw">in</span> <span class="ident">vals</span>.<span class="ident">iter_mut</span>() {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">num</span>) <span class="op">=</span> <span class="ident">nums</span>.<span class="ident">next</span>() {
<span class="kw">match</span> <span class="ident">num</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">f32</span><span class="op">></span>() {
<span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="kw-2">*</span><span class="ident">val</span> <span class="op">=</span> <span class="ident">v</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">ImageError</span>::<span class="ident">FormatError</span>(<span class="macro">format</span><span class="macro">!</span>(
<span class="string">"f32 parse error in {}: {}"</span>,
<span class="ident">name</span>,
<span class="ident">err</span>.<span class="ident">description</span>()
)));
}
}
} <span class="kw">else</span> {
<span class="comment">// not enough numbers in line</span>
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="macro">format</span><span class="macro">!</span>(
<span class="string">"Not enough numbers in {}"</span>,
<span class="ident">name</span>
)));
}
}
<span class="prelude-val">Ok</span>(<span class="ident">nums</span>.<span class="ident">next</span>().<span class="ident">is_some</span>())
}
<span class="comment">// Parses dimension line "-Y height +X width"</span>
<span class="comment">// returns (width, height) or error</span>
<span class="kw">fn</span> <span class="ident">parse_dimensions_line</span>(<span class="ident">line</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">strict</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span>(<span class="ident">u32</span>, <span class="ident">u32</span>)<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dim_parts</span> <span class="op">=</span> <span class="ident">line</span>.<span class="ident">split_whitespace</span>();
<span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="string">"Malformed dimensions line"</span>;
<span class="kw">let</span> <span class="ident">c1_tag</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(
<span class="ident">dim_parts</span>
.<span class="ident">next</span>()
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="ident">err</span>.<span class="ident">into</span>()))
);
<span class="kw">let</span> <span class="ident">c1_str</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(
<span class="ident">dim_parts</span>
.<span class="ident">next</span>()
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="ident">err</span>.<span class="ident">into</span>()))
);
<span class="kw">let</span> <span class="ident">c2_tag</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(
<span class="ident">dim_parts</span>
.<span class="ident">next</span>()
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="ident">err</span>.<span class="ident">into</span>()))
);
<span class="kw">let</span> <span class="ident">c2_str</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(
<span class="ident">dim_parts</span>
.<span class="ident">next</span>()
.<span class="ident">ok_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="ident">err</span>.<span class="ident">into</span>()))
);
<span class="kw">if</span> <span class="ident">strict</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">dim_parts</span>.<span class="ident">next</span>().<span class="ident">is_some</span>() {
<span class="comment">// extra data in dimensions line</span>
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="ident">err</span>.<span class="ident">into</span>()));
} <span class="comment">// no else</span>
<span class="comment">// dimensions line is in the form "-Y 10 +X 20"</span>
<span class="comment">// There are 8 possible orientations: +Y +X, +X -Y and so on</span>
<span class="kw">match</span> (<span class="ident">c1_tag</span>, <span class="ident">c2_tag</span>) {
(<span class="string">"-Y"</span>, <span class="string">"+X"</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// Common orientation (left-right, top-down)</span>
<span class="comment">// c1_str is height, c2_str is width</span>
<span class="kw">let</span> <span class="ident">height</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">c1_str</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>().<span class="ident">into_image_error</span>(<span class="ident">err</span>));
<span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">c2_str</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>().<span class="ident">into_image_error</span>(<span class="ident">err</span>));
<span class="prelude-val">Ok</span>((<span class="ident">width</span>, <span class="ident">height</span>))
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="macro">format</span><span class="macro">!</span>(
<span class="string">"Unsupported orientation {} {}"</span>,
<span class="ident">limit_string_len</span>(<span class="ident">c1_tag</span>, <span class="number">4</span>),
<span class="ident">limit_string_len</span>(<span class="ident">c2_tag</span>, <span class="number">4</span>)
))),
} <span class="comment">// final expression. Returns value</span>
}
<span class="kw">trait</span> <span class="ident">IntoImageError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">into_image_error</span>(<span class="self">self</span>, <span class="ident">description</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IntoImageError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> ::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, ::<span class="ident">std</span>::<span class="ident">num</span>::<span class="ident">ParseFloatError</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">into_image_error</span>(<span class="self">self</span>, <span class="ident">description</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"{} {}"</span>, <span class="ident">description</span>, <span class="ident">err</span>.<span class="ident">description</span>()))
})
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IntoImageError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> ::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, ::<span class="ident">std</span>::<span class="ident">num</span>::<span class="ident">ParseIntError</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">into_image_error</span>(<span class="self">self</span>, <span class="ident">description</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"{} {}"</span>, <span class="ident">description</span>, <span class="ident">err</span>.<span class="ident">description</span>()))
})
}
}
<span class="comment">// Returns string with no more than len+3 characters</span>
<span class="kw">fn</span> <span class="ident">limit_string_len</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">len</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> {
<span class="kw">let</span> <span class="ident">s_char_len</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">count</span>();
<span class="kw">if</span> <span class="ident">s_char_len</span> <span class="op">></span> <span class="ident">len</span> {
<span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">take</span>(<span class="ident">len</span>).<span class="ident">chain</span>(<span class="string">"..."</span>.<span class="ident">chars</span>()).<span class="ident">collect</span>()
} <span class="kw">else</span> {
<span class="ident">s</span>.<span class="ident">into</span>()
}
}
<span class="comment">// Splits string into (before separator, after separator) tuple</span>
<span class="comment">// or None if separator isn't found</span>
<span class="kw">fn</span> <span class="ident">split_at_first</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>, <span class="ident">separator</span>: <span class="kw-2">&</span><span class="ident">str</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="lifetime">'a</span> <span class="ident">str</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>)<span class="op">></span> {
<span class="kw">match</span> <span class="ident">s</span>.<span class="ident">find</span>(<span class="ident">separator</span>) {
<span class="prelude-val">None</span> <span class="op">|</span> <span class="prelude-val">Some</span>(<span class="number">0</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
<span class="prelude-val">Some</span>(<span class="ident">p</span>) <span class="kw">if</span> <span class="ident">p</span> <span class="op">></span><span class="op">=</span> <span class="ident">s</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">separator</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
<span class="prelude-val">Some</span>(<span class="ident">p</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="ident">s</span>[..<span class="ident">p</span>], <span class="kw-2">&</span><span class="ident">s</span>[(<span class="ident">p</span> <span class="op">+</span> <span class="ident">separator</span>.<span class="ident">len</span>())..])),
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">split_at_first_test</span>() {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">split_at_first</span>(<span class="kw-2">&</span><span class="ident">Cow</span>::<span class="ident">Owned</span>(<span class="string">""</span>.<span class="ident">into</span>()), <span class="string">"="</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">split_at_first</span>(<span class="kw-2">&</span><span class="ident">Cow</span>::<span class="ident">Owned</span>(<span class="string">"="</span>.<span class="ident">into</span>()), <span class="string">"="</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">split_at_first</span>(<span class="kw-2">&</span><span class="ident">Cow</span>::<span class="ident">Owned</span>(<span class="string">"= "</span>.<span class="ident">into</span>()), <span class="string">"="</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">split_at_first</span>(<span class="kw-2">&</span><span class="ident">Cow</span>::<span class="ident">Owned</span>(<span class="string">" = "</span>.<span class="ident">into</span>()), <span class="string">"="</span>),
<span class="prelude-val">Some</span>((<span class="string">" "</span>, <span class="string">" "</span>))
);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">split_at_first</span>(<span class="kw-2">&</span><span class="ident">Cow</span>::<span class="ident">Owned</span>(<span class="string">"EXPOSURE= "</span>.<span class="ident">into</span>()), <span class="string">"="</span>),
<span class="prelude-val">Some</span>((<span class="string">"EXPOSURE"</span>, <span class="string">" "</span>))
);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">split_at_first</span>(<span class="kw-2">&</span><span class="ident">Cow</span>::<span class="ident">Owned</span>(<span class="string">"EXPOSURE= ="</span>.<span class="ident">into</span>()), <span class="string">"="</span>),
<span class="prelude-val">Some</span>((<span class="string">"EXPOSURE"</span>, <span class="string">" ="</span>))
);
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">split_at_first</span>(<span class="kw-2">&</span><span class="ident">Cow</span>::<span class="ident">Owned</span>(<span class="string">"EXPOSURE== ="</span>.<span class="ident">into</span>()), <span class="string">"=="</span>),
<span class="prelude-val">Some</span>((<span class="string">"EXPOSURE"</span>, <span class="string">" ="</span>))
);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">split_at_first</span>(<span class="kw-2">&</span><span class="ident">Cow</span>::<span class="ident">Owned</span>(<span class="string">"EXPOSURE"</span>.<span class="ident">into</span>()), <span class="string">""</span>), <span class="prelude-val">None</span>);
}
<span class="comment">// Reads input until b"\n" or EOF</span>
<span class="comment">// Returns vector of read bytes NOT including end of line characters</span>
<span class="comment">// or return None to indicate end of file</span>
<span class="kw">fn</span> <span class="ident">read_line_u8</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span><span class="op">></span>(<span class="ident">r</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</span>) <span class="op">-</span><span class="op">></span> ::<span class="ident">std</span>::<span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="prelude-ty">Option</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="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="number">16</span>);
<span class="kw">match</span> <span class="ident">r</span>.<span class="ident">read_until</span>(<span class="string">b'\n'</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">ret</span>) {
<span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
<span class="prelude-val">Ok</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b'\n'</span>) <span class="op">=</span> <span class="ident">ret</span>[..].<span class="ident">last</span>() {
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">ret</span>.<span class="ident">pop</span>();
}
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">ret</span>))
}
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">err</span>),
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">read_line_u8_test</span>() {
<span class="kw">let</span> <span class="ident">buf</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> (<span class="kw-2">&</span><span class="string">b"One\nTwo\nThree\nFour\n\n\n"</span>[..]).<span class="ident">into</span>();
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> ::<span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="ident">buf</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">read_line_u8</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>().<span class="ident">unwrap</span>()[..], <span class="kw-2">&</span><span class="string">b"One"</span>[..]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">read_line_u8</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>().<span class="ident">unwrap</span>()[..], <span class="kw-2">&</span><span class="string">b"Two"</span>[..]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">read_line_u8</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>().<span class="ident">unwrap</span>()[..], <span class="kw-2">&</span><span class="string">b"Three"</span>[..]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">read_line_u8</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>().<span class="ident">unwrap</span>()[..], <span class="kw-2">&</span><span class="string">b"Four"</span>[..]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">read_line_u8</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>().<span class="ident">unwrap</span>()[..], <span class="kw-2">&</span><span class="string">b""</span>[..]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">read_line_u8</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>().<span class="ident">unwrap</span>()[..], <span class="kw-2">&</span><span class="string">b""</span>[..]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">read_line_u8</span>(<span class="ident">input</span>).<span class="ident">unwrap</span>(), <span class="prelude-val">None</span>);
}
<span class="doccomment">/// Helper function for reading raw 3-channel f32 images</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read_raw_file</span><span class="op"><</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="op">></span>(<span class="ident">path</span>: <span class="ident">P</span>) <span class="op">-</span><span class="op">></span> ::<span class="ident">std</span>::<span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Rgb</span><span class="op"><</span><span class="ident">f32</span><span class="op">></span><span class="op">></span><span class="op">></span> {
<span class="kw">use</span> <span class="ident">byteorder</span>::{<span class="ident">LittleEndian</span> <span class="kw">as</span> <span class="ident">LE</span>, <span class="ident">ReadBytesExt</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">BufReader</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">new</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">File</span>::<span class="ident">open</span>(<span class="ident">path</span>)));
<span class="kw">let</span> <span class="ident">w</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LE</span><span class="op">></span>()) <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">h</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LE</span><span class="op">></span>()) <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LE</span><span class="op">></span>()) <span class="kw">as</span> <span class="ident">usize</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>, <span class="number">3</span>);
<span class="kw">let</span> <span class="ident">cnt</span> <span class="op">=</span> <span class="ident">w</span> <span class="op">*</span> <span class="ident">h</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">cnt</span>);
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">cnt</span> {
<span class="kw">let</span> <span class="ident">cr</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">read_f32</span>::<span class="op"><</span><span class="ident">LE</span><span class="op">></span>());
<span class="kw">let</span> <span class="ident">cg</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">read_f32</span>::<span class="op"><</span><span class="ident">LE</span><span class="op">></span>());
<span class="kw">let</span> <span class="ident">cb</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">read_f32</span>::<span class="op"><</span><span class="ident">LE</span><span class="op">></span>());
<span class="ident">ret</span>.<span class="ident">push</span>(<span class="ident">Rgb</span>([<span class="ident">cr</span>, <span class="ident">cg</span>, <span class="ident">cb</span>]));
}
<span class="prelude-val">Ok</span>(<span class="ident">ret</span>)
}
</pre></div>
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