<!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/bmp/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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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Cursor</span>, <span class="ident">Read</span>, <span class="ident">Seek</span>, <span class="ident">SeekFrom</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>::{<span class="ident">repeat</span>, <span class="ident">Iterator</span>, <span class="ident">Rev</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">slice</span>::<span class="ident">ChunksMut</span>;
<span class="kw">use</span> <span class="ident">byteorder</span>::{<span class="ident">LittleEndian</span>, <span class="ident">ReadBytesExt</span>};
<span class="kw">use</span> <span class="ident">color</span>::<span class="ident">ColorType</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="kw">const</span> <span class="ident">BITMAPCOREHEADER_SIZE</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">12</span>;
<span class="kw">const</span> <span class="ident">BITMAPINFOHEADER_SIZE</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">40</span>;
<span class="kw">const</span> <span class="ident">BITMAPV2HEADER_SIZE</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">52</span>;
<span class="kw">const</span> <span class="ident">BITMAPV3HEADER_SIZE</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">56</span>;
<span class="kw">const</span> <span class="ident">BITMAPV4HEADER_SIZE</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">108</span>;
<span class="kw">const</span> <span class="ident">BITMAPV5HEADER_SIZE</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">124</span>;
<span class="kw">static</span> <span class="ident">LOOKUP_TABLE_3_BIT_TO_8_BIT</span>: [<span class="ident">u8</span>; <span class="number">8</span>] <span class="op">=</span> [<span class="number">0</span>, <span class="number">36</span>, <span class="number">73</span>, <span class="number">109</span>, <span class="number">146</span>, <span class="number">182</span>, <span class="number">219</span>, <span class="number">255</span>];
<span class="kw">static</span> <span class="ident">LOOKUP_TABLE_4_BIT_TO_8_BIT</span>: [<span class="ident">u8</span>; <span class="number">16</span>] <span class="op">=</span> [
<span class="number">0</span>, <span class="number">17</span>, <span class="number">34</span>, <span class="number">51</span>, <span class="number">68</span>, <span class="number">85</span>, <span class="number">102</span>, <span class="number">119</span>, <span class="number">136</span>, <span class="number">153</span>, <span class="number">170</span>, <span class="number">187</span>, <span class="number">204</span>, <span class="number">221</span>, <span class="number">238</span>, <span class="number">255</span>,
];
<span class="kw">static</span> <span class="ident">LOOKUP_TABLE_5_BIT_TO_8_BIT</span>: [<span class="ident">u8</span>; <span class="number">32</span>] <span class="op">=</span> [
<span class="number">0</span>, <span class="number">8</span>, <span class="number">16</span>, <span class="number">25</span>, <span class="number">33</span>, <span class="number">41</span>, <span class="number">49</span>, <span class="number">58</span>, <span class="number">66</span>, <span class="number">74</span>, <span class="number">82</span>, <span class="number">90</span>, <span class="number">99</span>, <span class="number">107</span>, <span class="number">115</span>, <span class="number">123</span>, <span class="number">132</span>, <span class="number">140</span>, <span class="number">148</span>, <span class="number">156</span>, <span class="number">165</span>, <span class="number">173</span>,
<span class="number">181</span>, <span class="number">189</span>, <span class="number">197</span>, <span class="number">206</span>, <span class="number">214</span>, <span class="number">222</span>, <span class="number">230</span>, <span class="number">239</span>, <span class="number">247</span>, <span class="number">255</span>,
];
<span class="kw">static</span> <span class="ident">LOOKUP_TABLE_6_BIT_TO_8_BIT</span>: [<span class="ident">u8</span>; <span class="number">64</span>] <span class="op">=</span> [
<span class="number">0</span>, <span class="number">4</span>, <span class="number">8</span>, <span class="number">12</span>, <span class="number">16</span>, <span class="number">20</span>, <span class="number">24</span>, <span class="number">28</span>, <span class="number">32</span>, <span class="number">36</span>, <span class="number">40</span>, <span class="number">45</span>, <span class="number">49</span>, <span class="number">53</span>, <span class="number">57</span>, <span class="number">61</span>, <span class="number">65</span>, <span class="number">69</span>, <span class="number">73</span>, <span class="number">77</span>, <span class="number">81</span>, <span class="number">85</span>, <span class="number">89</span>, <span class="number">93</span>,
<span class="number">97</span>, <span class="number">101</span>, <span class="number">105</span>, <span class="number">109</span>, <span class="number">113</span>, <span class="number">117</span>, <span class="number">121</span>, <span class="number">125</span>, <span class="number">130</span>, <span class="number">134</span>, <span class="number">138</span>, <span class="number">142</span>, <span class="number">146</span>, <span class="number">150</span>, <span class="number">154</span>, <span class="number">158</span>, <span class="number">162</span>, <span class="number">166</span>, <span class="number">170</span>,
<span class="number">174</span>, <span class="number">178</span>, <span class="number">182</span>, <span class="number">186</span>, <span class="number">190</span>, <span class="number">194</span>, <span class="number">198</span>, <span class="number">202</span>, <span class="number">206</span>, <span class="number">210</span>, <span class="number">215</span>, <span class="number">219</span>, <span class="number">223</span>, <span class="number">227</span>, <span class="number">231</span>, <span class="number">235</span>, <span class="number">239</span>, <span class="number">243</span>, <span class="number">247</span>,
<span class="number">251</span>, <span class="number">255</span>,
];
<span class="kw">static</span> <span class="ident">R5_G5_B5_COLOR_MASK</span>: <span class="ident">Bitfields</span> <span class="op">=</span> <span class="ident">Bitfields</span> {
<span class="ident">r</span>: <span class="ident">Bitfield</span> { <span class="ident">len</span>: <span class="number">5</span>, <span class="ident">shift</span>: <span class="number">10</span> },
<span class="ident">g</span>: <span class="ident">Bitfield</span> { <span class="ident">len</span>: <span class="number">5</span>, <span class="ident">shift</span>: <span class="number">5</span> },
<span class="ident">b</span>: <span class="ident">Bitfield</span> { <span class="ident">len</span>: <span class="number">5</span>, <span class="ident">shift</span>: <span class="number">0</span> },
<span class="ident">a</span>: <span class="ident">Bitfield</span> { <span class="ident">len</span>: <span class="number">0</span>, <span class="ident">shift</span>: <span class="number">0</span> },
};
<span class="kw">const</span> <span class="ident">R8_G8_B8_COLOR_MASK</span>: <span class="ident">Bitfields</span> <span class="op">=</span> <span class="ident">Bitfields</span> {
<span class="ident">r</span>: <span class="ident">Bitfield</span> { <span class="ident">len</span>: <span class="number">8</span>, <span class="ident">shift</span>: <span class="number">24</span> },
<span class="ident">g</span>: <span class="ident">Bitfield</span> { <span class="ident">len</span>: <span class="number">8</span>, <span class="ident">shift</span>: <span class="number">16</span> },
<span class="ident">b</span>: <span class="ident">Bitfield</span> { <span class="ident">len</span>: <span class="number">8</span>, <span class="ident">shift</span>: <span class="number">8</span> },
<span class="ident">a</span>: <span class="ident">Bitfield</span> { <span class="ident">len</span>: <span class="number">0</span>, <span class="ident">shift</span>: <span class="number">0</span> },
};
<span class="kw">const</span> <span class="ident">RLE_ESCAPE</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">const</span> <span class="ident">RLE_ESCAPE_EOL</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">const</span> <span class="ident">RLE_ESCAPE_EOF</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">1</span>;
<span class="kw">const</span> <span class="ident">RLE_ESCAPE_DELTA</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">2</span>;
<span class="doccomment">/// The maximum width/height the decoder will process.</span>
<span class="kw">const</span> <span class="ident">MAX_WIDTH_HEIGHT</span>: <span class="ident">i32</span> <span class="op">=</span> <span class="number">0xFFFF</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Copy</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">enum</span> <span class="ident">ImageType</span> {
<span class="ident">Palette</span>,
<span class="ident">RGB16</span>,
<span class="ident">RGB24</span>,
<span class="ident">RGB32</span>,
<span class="ident">RGBA32</span>,
<span class="ident">RLE8</span>,
<span class="ident">RLE4</span>,
<span class="ident">Bitfields16</span>,
<span class="ident">Bitfields32</span>,
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>)]</span>
<span class="kw">enum</span> <span class="ident">BMPHeaderType</span> {
<span class="ident">Core</span>,
<span class="ident">Info</span>,
<span class="ident">V2</span>,
<span class="ident">V3</span>,
<span class="ident">V4</span>,
<span class="ident">V5</span>,
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>)]</span>
<span class="kw">enum</span> <span class="ident">FormatFullBytes</span> {
<span class="ident">RGB24</span>,
<span class="ident">RGB32</span>,
<span class="ident">RGBA32</span>,
<span class="ident">Format888</span>,
}
<span class="kw">enum</span> <span class="ident">Chunker</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">FromTop</span>(<span class="ident">ChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">u8</span><span class="op">></span>),
<span class="ident">FromBottom</span>(<span class="ident">Rev</span><span class="op"><</span><span class="ident">ChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">u8</span><span class="op">></span><span class="op">></span>),
}
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RowIterator</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">chunks</span>: <span class="ident">Chunker</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">RowIterator</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>];
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</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="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]<span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">chunks</span> {
<span class="ident">Chunker</span>::<span class="ident">FromTop</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">chunks</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chunks</span>.<span class="ident">next</span>(),
<span class="ident">Chunker</span>::<span class="ident">FromBottom</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">chunks</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chunks</span>.<span class="ident">next</span>(),
}
}
}
<span class="doccomment">/// Convenience function to check if the combination of width, length and number of</span>
<span class="doccomment">/// channels would result in a buffer that would overflow.</span>
<span class="kw">fn</span> <span class="ident">check_for_overflow</span>(<span class="ident">width</span>: <span class="ident">i32</span>, <span class="ident">length</span>: <span class="ident">i32</span>, <span class="ident">channels</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span>()<span class="op">></span> {
<span class="ident">num_bytes</span>(<span class="ident">width</span>, <span class="ident">length</span>, <span class="ident">channels</span>)
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</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="string">"Image would require a buffer that is too large to be represented!"</span>.<span class="ident">to_owned</span>(),
)
})
}
<span class="doccomment">/// Calculate how many many bytes a buffer holding a decoded image with these properties would</span>
<span class="doccomment">/// require. Returns `None` if the buffer size would overflow or if one of the sizes are negative.</span>
<span class="kw">fn</span> <span class="ident">num_bytes</span>(<span class="ident">width</span>: <span class="ident">i32</span>, <span class="ident">length</span>: <span class="ident">i32</span>, <span class="ident">channels</span>: <span class="ident">usize</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">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="ident">length</span> <span class="op"><</span><span class="op">=</span> <span class="number">0</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="kw">match</span> <span class="ident">channels</span>.<span class="ident">checked_mul</span>(<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span>) {
<span class="prelude-val">Some</span>(<span class="ident">n</span>) <span class="op">=</span><span class="op">></span> <span class="ident">n</span>.<span class="ident">checked_mul</span>(<span class="ident">length</span> <span class="kw">as</span> <span class="ident">usize</span>),
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
}
<span class="doccomment">/// The maximum starting number of pixels in the pixel buffer, might want to tweak this.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For images that specify large sizes, we don't allocate the full buffer right away</span>
<span class="doccomment">/// to somewhat mitigate trying to make the decoder run out of memory by sending a bogus image.</span>
<span class="doccomment">/// This is somewhat of a workaroud as ideally we would check against the expected file size</span>
<span class="doccomment">/// but that's not possible through the Read and Seek traits alone and would require the encoder</span>
<span class="doccomment">/// to provided with it from the caller.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// NOTE: This is multiplied by 3 or 4 depending on the number of channels to get the maximum</span>
<span class="doccomment">/// starting buffer size. This amounts to about 134 mb for a buffer with 4 channels.</span>
<span class="kw">const</span> <span class="ident">MAX_INITIAL_PIXELS</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">8192</span> <span class="op">*</span> <span class="number">4096</span>;
<span class="doccomment">/// Sets all bytes in an mutable iterator over slices of bytes to 0.</span>
<span class="kw">fn</span> <span class="ident">blank_bytes</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]<span class="op">></span><span class="op">></span>(<span class="ident">iterator</span>: <span class="ident">T</span>) {
<span class="kw">for</span> <span class="ident">chunk</span> <span class="kw">in</span> <span class="ident">iterator</span> {
<span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> <span class="ident">chunk</span> {
<span class="kw-2">*</span><span class="ident">b</span> <span class="op">=</span> <span class="number">0</span>;
}
}
}
<span class="doccomment">/// Extend the buffer to `full_size`, copying existing data to the end of the buffer. Returns slice</span>
<span class="doccomment">/// pointing to the part of the buffer that is not yet filled in.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If blank is true, the bytes in the new buffer that are not filled in are set to 0.</span>
<span class="doccomment">/// This is used for rle-encoded images as the decoding process for these may not fill in all the</span>
<span class="doccomment">/// pixels.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// As BMP images are usually stored with the rows upside-down we have to write the image data</span>
<span class="doccomment">/// starting at the end of the buffer and thus we have to make sure the existing data is put at the</span>
<span class="doccomment">/// end of the buffer.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span>
<span class="attribute">#[<span class="ident">cold</span>]</span>
<span class="kw">fn</span> <span class="ident">extend_buffer</span>(<span class="ident">buffer</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">full_size</span>: <span class="ident">usize</span>, <span class="ident">blank</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>] {
<span class="kw">let</span> <span class="ident">old_size</span> <span class="op">=</span> <span class="ident">buffer</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="ident">extend</span> <span class="op">=</span> <span class="ident">full_size</span> <span class="op">-</span> <span class="ident">buffer</span>.<span class="ident">len</span>();
<span class="ident">buffer</span>.<span class="ident">extend</span>(<span class="ident">repeat</span>(<span class="number">0xFF</span>).<span class="ident">take</span>(<span class="ident">extend</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buffer</span>.<span class="ident">len</span>(), <span class="ident">full_size</span>);
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">extend</span> <span class="op">></span><span class="op">=</span> <span class="ident">old_size</span> {
<span class="comment">// If the full buffer length is more or equal to twice the initial one, we can simply</span>
<span class="comment">// copy the data in the lower part of the buffer to the end of it and input from there.</span>
<span class="kw">let</span> (<span class="ident">new</span>, <span class="ident">old</span>) <span class="op">=</span> <span class="ident">buffer</span>.<span class="ident">split_at_mut</span>(<span class="ident">extend</span>);
<span class="ident">old</span>.<span class="ident">copy_from_slice</span>(<span class="kw-2">&</span><span class="ident">new</span>[..<span class="ident">old_size</span>]);
<span class="ident">new</span>
} <span class="kw">else</span> {
<span class="comment">// If the full size is less than twice the initial buffer, we have to</span>
<span class="comment">// copy in two steps</span>
<span class="kw">let</span> <span class="ident">overlap</span> <span class="op">=</span> <span class="ident">old_size</span> <span class="op">-</span> <span class="ident">extend</span>;
<span class="comment">// First we copy the data that fits into the bit we extended.</span>
<span class="kw">let</span> (<span class="ident">lower</span>, <span class="ident">upper</span>) <span class="op">=</span> <span class="ident">buffer</span>.<span class="ident">split_at_mut</span>(<span class="ident">old_size</span>);
<span class="ident">upper</span>.<span class="ident">copy_from_slice</span>(<span class="kw-2">&</span><span class="ident">lower</span>[<span class="ident">overlap</span>..]);
<span class="comment">// Then we slide the data that hasn't been copied yet to the top of the buffer</span>
<span class="kw">let</span> (<span class="ident">new</span>, <span class="ident">old</span>) <span class="op">=</span> <span class="ident">lower</span>.<span class="ident">split_at_mut</span>(<span class="ident">extend</span>);
<span class="ident">old</span>[..<span class="ident">overlap</span>].<span class="ident">copy_from_slice</span>(<span class="kw-2">&</span><span class="ident">new</span>[..<span class="ident">overlap</span>]);
<span class="ident">new</span>
};
<span class="kw">if</span> <span class="ident">blank</span> {
<span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> <span class="ident">ret</span>.<span class="ident">iter_mut</span>() {
<span class="kw-2">*</span><span class="ident">b</span> <span class="op">=</span> <span class="number">0</span>;
}
};
<span class="ident">ret</span>
}
<span class="doccomment">/// Call the provided function on each row of the provided buffer, returning Err if the provided</span>
<span class="doccomment">/// function returns an error, extends the buffer if it's not large enough.</span>
<span class="kw">fn</span> <span class="ident">with_rows</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(
<span class="ident">buffer</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
<span class="ident">width</span>: <span class="ident">i32</span>,
<span class="ident">height</span>: <span class="ident">i32</span>,
<span class="ident">channels</span>: <span class="ident">usize</span>,
<span class="ident">top_down</span>: <span class="ident">bool</span>,
<span class="kw-2">mut</span> <span class="ident">func</span>: <span class="ident">F</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span>,
{
<span class="comment">// An overflow should already have been checked for when this is called,</span>
<span class="comment">// though we check anyhow, as it somehow seems to increase performance slightly.</span>
<span class="kw">let</span> <span class="ident">row_width</span> <span class="op">=</span> <span class="ident">channels</span>.<span class="ident">checked_mul</span>(<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">full_image_size</span> <span class="op">=</span> <span class="ident">row_width</span>.<span class="ident">checked_mul</span>(<span class="ident">height</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">unwrap</span>();
<span class="kw">if</span> <span class="op">!</span><span class="ident">top_down</span> {
<span class="kw">for</span> <span class="ident">row</span> <span class="kw">in</span> <span class="ident">buffer</span>.<span class="ident">chunks_mut</span>(<span class="ident">row_width</span>).<span class="ident">rev</span>() {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">func</span>(<span class="ident">row</span>));
}
<span class="comment">// If we need more space, extend the buffer.</span>
<span class="kw">if</span> <span class="ident">buffer</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">full_image_size</span> {
<span class="kw">let</span> <span class="ident">new_space</span> <span class="op">=</span> <span class="ident">extend_buffer</span>(<span class="ident">buffer</span>, <span class="ident">full_image_size</span>, <span class="bool-val">false</span>);
<span class="kw">for</span> <span class="ident">row</span> <span class="kw">in</span> <span class="ident">new_space</span>.<span class="ident">chunks_mut</span>(<span class="ident">row_width</span>).<span class="ident">rev</span>() {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">func</span>(<span class="ident">row</span>));
}
}
} <span class="kw">else</span> {
<span class="kw">for</span> <span class="ident">row</span> <span class="kw">in</span> <span class="ident">buffer</span>.<span class="ident">chunks_mut</span>(<span class="ident">row_width</span>) {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">func</span>(<span class="ident">row</span>));
}
<span class="kw">if</span> <span class="ident">buffer</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">full_image_size</span> {
<span class="comment">// If the image is stored in top-down order, we can simply use the extend function</span>
<span class="comment">// from vec to extend the buffer..</span>
<span class="kw">let</span> <span class="ident">extend</span> <span class="op">=</span> <span class="ident">full_image_size</span> <span class="op">-</span> <span class="ident">buffer</span>.<span class="ident">len</span>();
<span class="ident">buffer</span>.<span class="ident">extend</span>(<span class="ident">repeat</span>(<span class="number">0xFF</span>).<span class="ident">take</span>(<span class="ident">extend</span>));
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">buffer</span>.<span class="ident">len</span>();
<span class="kw">for</span> <span class="ident">row</span> <span class="kw">in</span> <span class="ident">buffer</span>[<span class="ident">len</span> <span class="op">-</span> <span class="ident">row_width</span>..].<span class="ident">chunks_mut</span>(<span class="ident">row_width</span>) {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">func</span>(<span class="ident">row</span>));
}
};
}
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn</span> <span class="ident">set_8bit_pixel_run</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">u8</span><span class="op">></span><span class="op">></span>(
<span class="ident">pixel_iter</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
<span class="ident">palette</span>: <span class="kw-2">&</span>[(<span class="ident">u8</span>, <span class="ident">u8</span>, <span class="ident">u8</span>)],
<span class="ident">indices</span>: <span class="ident">T</span>,
<span class="ident">n_pixels</span>: <span class="ident">usize</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">for</span> <span class="ident">idx</span> <span class="kw">in</span> <span class="ident">indices</span>.<span class="ident">take</span>(<span class="ident">n_pixels</span>) {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">pixel</span>) <span class="op">=</span> <span class="ident">pixel_iter</span>.<span class="ident">next</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">palette</span>[<span class="kw-2">*</span><span class="ident">idx</span> <span class="kw">as</span> <span class="ident">usize</span>];
<span class="ident">pixel</span>[<span class="number">0</span>] <span class="op">=</span> <span class="ident">r</span>;
<span class="ident">pixel</span>[<span class="number">1</span>] <span class="op">=</span> <span class="ident">g</span>;
<span class="ident">pixel</span>[<span class="number">2</span>] <span class="op">=</span> <span class="ident">b</span>;
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="bool-val">false</span>;
}
}
<span class="bool-val">true</span>
}
<span class="kw">fn</span> <span class="ident">set_4bit_pixel_run</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">u8</span><span class="op">></span><span class="op">></span>(
<span class="ident">pixel_iter</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
<span class="ident">palette</span>: <span class="kw-2">&</span>[(<span class="ident">u8</span>, <span class="ident">u8</span>, <span class="ident">u8</span>)],
<span class="ident">indices</span>: <span class="ident">T</span>,
<span class="kw-2">mut</span> <span class="ident">n_pixels</span>: <span class="ident">usize</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">for</span> <span class="ident">idx</span> <span class="kw">in</span> <span class="ident">indices</span> {
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">set_pixel</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">n_pixels</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">break</span>;
}
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">pixel</span>) <span class="op">=</span> <span class="ident">pixel_iter</span>.<span class="ident">next</span>() {
<span class="kw">let</span> (<span class="ident">r</span>, <span class="ident">g</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="ident">palette</span>[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> <span class="kw">as</span> <span class="ident">usize</span>];
<span class="ident">pixel</span>[<span class="number">0</span>] <span class="op">=</span> <span class="ident">r</span>;
<span class="ident">pixel</span>[<span class="number">1</span>] <span class="op">=</span> <span class="ident">g</span>;
<span class="ident">pixel</span>[<span class="number">2</span>] <span class="op">=</span> <span class="ident">b</span>;
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="bool-val">false</span>;
}
<span class="ident">n_pixels</span> <span class="op">-</span><span class="op">=</span> <span class="number">1</span>;
};
}
<span class="macro">set_pixel</span><span class="macro">!</span>(<span class="ident">idx</span> <span class="op">></span><span class="op">></span> <span class="number">4</span>);
<span class="macro">set_pixel</span><span class="macro">!</span>(<span class="ident">idx</span> <span class="op">&</span> <span class="number">0xf</span>);
}
<span class="bool-val">true</span>
}
<span class="kw">fn</span> <span class="ident">set_1bit_pixel_run</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">u8</span><span class="op">></span><span class="op">></span>(
<span class="ident">pixel_iter</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
<span class="ident">palette</span>: <span class="kw-2">&</span>[(<span class="ident">u8</span>, <span class="ident">u8</span>, <span class="ident">u8</span>)],
<span class="ident">indices</span>: <span class="ident">T</span>,
) {
<span class="kw">for</span> <span class="ident">idx</span> <span class="kw">in</span> <span class="ident">indices</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bit</span> <span class="op">=</span> <span class="number">0x80</span>;
<span class="kw">loop</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">pixel</span>) <span class="op">=</span> <span class="ident">pixel_iter</span>.<span class="ident">next</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">palette</span>[((<span class="ident">idx</span> <span class="op">&</span> <span class="ident">bit</span>) <span class="op">!</span><span class="op">=</span> <span class="number">0</span>) <span class="kw">as</span> <span class="ident">usize</span>];
<span class="ident">pixel</span>[<span class="number">0</span>] <span class="op">=</span> <span class="ident">r</span>;
<span class="ident">pixel</span>[<span class="number">1</span>] <span class="op">=</span> <span class="ident">g</span>;
<span class="ident">pixel</span>[<span class="number">2</span>] <span class="op">=</span> <span class="ident">b</span>;
} <span class="kw">else</span> {
<span class="kw">return</span>;
}
<span class="ident">bit</span> <span class="op">></span><span class="op">></span><span class="op">=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="ident">bit</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">break</span>;
}
}
}
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">struct</span> <span class="ident">Bitfield</span> {
<span class="ident">shift</span>: <span class="ident">u32</span>,
<span class="ident">len</span>: <span class="ident">u32</span>,
}
<span class="kw">impl</span> <span class="ident">Bitfield</span> {
<span class="kw">fn</span> <span class="ident">from_mask</span>(<span class="ident">mask</span>: <span class="ident">u32</span>, <span class="ident">max_len</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">Bitfield</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">mask</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="ident">Bitfield</span> { <span class="ident">shift</span>: <span class="number">0</span>, <span class="ident">len</span>: <span class="number">0</span> });
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">shift</span> <span class="op">=</span> <span class="ident">mask</span>.<span class="ident">trailing_zeros</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">len</span> <span class="op">=</span> (<span class="op">!</span>(<span class="ident">mask</span> <span class="op">></span><span class="op">></span> <span class="ident">shift</span>)).<span class="ident">trailing_zeros</span>();
<span class="kw">if</span> <span class="ident">len</span> <span class="op">!</span><span class="op">=</span> <span class="ident">mask</span>.<span class="ident">count_ones</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">"Non-contiguous bitfield mask"</span>.<span class="ident">to_string</span>(),
));
}
<span class="kw">if</span> <span class="ident">len</span> <span class="op">+</span> <span class="ident">shift</span> <span class="op">></span> <span class="ident">max_len</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">"Invalid bitfield mask"</span>.<span class="ident">to_string</span>()));
}
<span class="kw">if</span> <span class="ident">len</span> <span class="op">></span> <span class="number">8</span> {
<span class="ident">shift</span> <span class="op">+</span><span class="op">=</span> <span class="ident">len</span> <span class="op">-</span> <span class="number">8</span>;
<span class="ident">len</span> <span class="op">=</span> <span class="number">8</span>;
}
<span class="prelude-val">Ok</span>(<span class="ident">Bitfield</span> { <span class="ident">shift</span>, <span class="ident">len</span> })
}
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">data</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u8</span> {
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">data</span> <span class="op">></span><span class="op">></span> <span class="self">self</span>.<span class="ident">shift</span>;
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">len</span> {
<span class="number">1</span> <span class="op">=</span><span class="op">></span> ((<span class="ident">data</span> <span class="op">&</span> <span class="number">0b1</span>) <span class="op">*</span> <span class="number">0xff</span>) <span class="kw">as</span> <span class="ident">u8</span>,
<span class="number">2</span> <span class="op">=</span><span class="op">></span> ((<span class="ident">data</span> <span class="op">&</span> <span class="number">0b11</span>) <span class="op">*</span> <span class="number">0x55</span>) <span class="kw">as</span> <span class="ident">u8</span>,
<span class="number">3</span> <span class="op">=</span><span class="op">></span> <span class="ident">LOOKUP_TABLE_3_BIT_TO_8_BIT</span>[(<span class="ident">data</span> <span class="op">&</span> <span class="number">0b00_0111</span>) <span class="kw">as</span> <span class="ident">usize</span>],
<span class="number">4</span> <span class="op">=</span><span class="op">></span> <span class="ident">LOOKUP_TABLE_4_BIT_TO_8_BIT</span>[(<span class="ident">data</span> <span class="op">&</span> <span class="number">0b00_1111</span>) <span class="kw">as</span> <span class="ident">usize</span>],
<span class="number">5</span> <span class="op">=</span><span class="op">></span> <span class="ident">LOOKUP_TABLE_5_BIT_TO_8_BIT</span>[(<span class="ident">data</span> <span class="op">&</span> <span class="number">0b01_1111</span>) <span class="kw">as</span> <span class="ident">usize</span>],
<span class="number">6</span> <span class="op">=</span><span class="op">></span> <span class="ident">LOOKUP_TABLE_6_BIT_TO_8_BIT</span>[(<span class="ident">data</span> <span class="op">&</span> <span class="number">0b11_1111</span>) <span class="kw">as</span> <span class="ident">usize</span>],
<span class="number">7</span> <span class="op">=</span><span class="op">></span> ((<span class="ident">data</span> <span class="op">&</span> <span class="number">0x7f</span>) <span class="op"><</span><span class="op"><</span> <span class="number">1</span> <span class="op">|</span> (<span class="ident">data</span> <span class="op">&</span> <span class="number">0x7f</span>) <span class="op">></span><span class="op">></span> <span class="number">6</span>) <span class="kw">as</span> <span class="ident">u8</span>,
<span class="number">8</span> <span class="op">=</span><span class="op">></span> (<span class="ident">data</span> <span class="op">&</span> <span class="number">0xff</span>) <span class="kw">as</span> <span class="ident">u8</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(),
}
}
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">struct</span> <span class="ident">Bitfields</span> {
<span class="ident">r</span>: <span class="ident">Bitfield</span>,
<span class="ident">g</span>: <span class="ident">Bitfield</span>,
<span class="ident">b</span>: <span class="ident">Bitfield</span>,
<span class="ident">a</span>: <span class="ident">Bitfield</span>,
}
<span class="kw">impl</span> <span class="ident">Bitfields</span> {
<span class="kw">fn</span> <span class="ident">from_mask</span>(
<span class="ident">r_mask</span>: <span class="ident">u32</span>,
<span class="ident">g_mask</span>: <span class="ident">u32</span>,
<span class="ident">b_mask</span>: <span class="ident">u32</span>,
<span class="ident">a_mask</span>: <span class="ident">u32</span>,
<span class="ident">max_len</span>: <span class="ident">u32</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span><span class="ident">Bitfields</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">bitfields</span> <span class="op">=</span> <span class="ident">Bitfields</span> {
<span class="ident">r</span>: <span class="macro">try</span><span class="macro">!</span>(<span class="ident">Bitfield</span>::<span class="ident">from_mask</span>(<span class="ident">r_mask</span>, <span class="ident">max_len</span>)),
<span class="ident">g</span>: <span class="macro">try</span><span class="macro">!</span>(<span class="ident">Bitfield</span>::<span class="ident">from_mask</span>(<span class="ident">g_mask</span>, <span class="ident">max_len</span>)),
<span class="ident">b</span>: <span class="macro">try</span><span class="macro">!</span>(<span class="ident">Bitfield</span>::<span class="ident">from_mask</span>(<span class="ident">b_mask</span>, <span class="ident">max_len</span>)),
<span class="ident">a</span>: <span class="macro">try</span><span class="macro">!</span>(<span class="ident">Bitfield</span>::<span class="ident">from_mask</span>(<span class="ident">a_mask</span>, <span class="ident">max_len</span>)),
};
<span class="kw">if</span> <span class="ident">bitfields</span>.<span class="ident">r</span>.<span class="ident">len</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="ident">bitfields</span>.<span class="ident">g</span>.<span class="ident">len</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> <span class="op">|</span><span class="op">|</span> <span class="ident">bitfields</span>.<span class="ident">b</span>.<span class="ident">len</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</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">"Missing bitfield mask"</span>.<span class="ident">to_string</span>()));
}
<span class="prelude-val">Ok</span>(<span class="ident">bitfields</span>)
}
}
<span class="doccomment">/// A bmp decoder</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">BMPDecoder</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">bmp_header_type</span>: <span class="ident">BMPHeaderType</span>,
<span class="ident">width</span>: <span class="ident">i32</span>,
<span class="ident">height</span>: <span class="ident">i32</span>,
<span class="ident">data_offset</span>: <span class="ident">u64</span>,
<span class="ident">top_down</span>: <span class="ident">bool</span>,
<span class="ident">no_file_header</span>: <span class="ident">bool</span>,
<span class="ident">add_alpha_channel</span>: <span class="ident">bool</span>,
<span class="ident">has_loaded_metadata</span>: <span class="ident">bool</span>,
<span class="ident">image_type</span>: <span class="ident">ImageType</span>,
<span class="ident">bit_count</span>: <span class="ident">u16</span>,
<span class="ident">colors_used</span>: <span class="ident">u32</span>,
<span class="ident">palette</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="ident">u8</span>, <span class="ident">u8</span>)<span class="op">></span><span class="op">></span>,
<span class="ident">bitfields</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Bitfields</span><span class="op">></span>,
}
<span class="kw">enum</span> <span class="ident">RLEInsn</span> {
<span class="ident">EndOfFile</span>,
<span class="ident">EndOfRow</span>,
<span class="ident">Delta</span>(<span class="ident">u8</span>, <span class="ident">u8</span>),
<span class="ident">Absolute</span>(<span class="ident">u8</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>),
<span class="ident">PixelRun</span>(<span class="ident">u8</span>, <span class="ident">u8</span>),
}
<span class="kw">struct</span> <span class="ident">RLEInsnIterator</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">R</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">Read</span><span class="op">></span> {
<span class="ident">r</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">R</span>,
<span class="ident">image_type</span>: <span class="ident">ImageType</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">RLEInsnIterator</span><span class="op"><</span><span class="lifetime">'a</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">RLEInsn</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="ident">RLEInsn</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">control_byte</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u8</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">b</span>) <span class="op">=</span><span class="op">></span> <span class="ident">b</span>,
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">None</span>,
};
<span class="kw">match</span> <span class="ident">control_byte</span> {
<span class="ident">RLE_ESCAPE</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">op</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u8</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">b</span>) <span class="op">=</span><span class="op">></span> <span class="ident">b</span>,
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">None</span>,
};
<span class="kw">match</span> <span class="ident">op</span> {
<span class="ident">RLE_ESCAPE_EOL</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RLEInsn</span>::<span class="ident">EndOfRow</span>),
<span class="ident">RLE_ESCAPE_EOF</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RLEInsn</span>::<span class="ident">EndOfFile</span>),
<span class="ident">RLE_ESCAPE_DELTA</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">xdelta</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u8</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=</span><span class="op">></span> <span class="ident">n</span>,
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">None</span>,
};
<span class="kw">let</span> <span class="ident">ydelta</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u8</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=</span><span class="op">></span> <span class="ident">n</span>,
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">None</span>,
};
<span class="prelude-val">Some</span>(<span class="ident">RLEInsn</span>::<span class="ident">Delta</span>(<span class="ident">xdelta</span>, <span class="ident">ydelta</span>))
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">length</span> <span class="op">=</span> <span class="ident">op</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">image_type</span> <span class="op">=</span><span class="op">=</span> <span class="ident">ImageType</span>::<span class="ident">RLE4</span> {
<span class="ident">length</span> <span class="op">=</span> (<span class="ident">length</span> <span class="op">+</span> <span class="number">1</span>) <span class="op">/</span> <span class="number">2</span>;
}
<span class="ident">length</span> <span class="op">+</span><span class="op">=</span> <span class="ident">length</span> <span class="op">&</span> <span class="number">1</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>; <span class="ident">length</span>];
<span class="kw">match</span> <span class="self">self</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">buffer</span>) {
<span class="prelude-val">Ok</span>(()) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RLEInsn</span>::<span class="ident">Absolute</span>(<span class="ident">op</span>, <span class="ident">buffer</span>)),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
}
}
}
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u8</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">palette_index</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="ident">RLEInsn</span>::<span class="ident">PixelRun</span>(<span class="ident">control_byte</span>, <span class="ident">palette_index</span>)),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
},
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span> <span class="op">+</span> <span class="ident">Seek</span><span class="op">></span> <span class="ident">BMPDecoder</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="doccomment">/// Create a new decoder that decodes from the stream ```r```</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">BMPDecoder</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">decoder</span> <span class="op">=</span> <span class="ident">BMPDecoder</span> {
<span class="ident">r</span>,
<span class="ident">bmp_header_type</span>: <span class="ident">BMPHeaderType</span>::<span class="ident">Info</span>,
<span class="ident">width</span>: <span class="number">0</span>,
<span class="ident">height</span>: <span class="number">0</span>,
<span class="ident">data_offset</span>: <span class="number">0</span>,
<span class="ident">top_down</span>: <span class="bool-val">false</span>,
<span class="ident">no_file_header</span>: <span class="bool-val">false</span>,
<span class="ident">add_alpha_channel</span>: <span class="bool-val">false</span>,
<span class="ident">has_loaded_metadata</span>: <span class="bool-val">false</span>,
<span class="ident">image_type</span>: <span class="ident">ImageType</span>::<span class="ident">Palette</span>,
<span class="ident">bit_count</span>: <span class="number">0</span>,
<span class="ident">colors_used</span>: <span class="number">0</span>,
<span class="ident">palette</span>: <span class="prelude-val">None</span>,
<span class="ident">bitfields</span>: <span class="prelude-val">None</span>,
};
<span class="ident">decoder</span>.<span class="ident">read_metadata</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">decoder</span>)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ico"</span>)]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new_with_ico_format</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">BMPDecoder</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">decoder</span> <span class="op">=</span> <span class="ident">BMPDecoder</span> {
<span class="ident">r</span>,
<span class="ident">bmp_header_type</span>: <span class="ident">BMPHeaderType</span>::<span class="ident">Info</span>,
<span class="ident">width</span>: <span class="number">0</span>,
<span class="ident">height</span>: <span class="number">0</span>,
<span class="ident">data_offset</span>: <span class="number">0</span>,
<span class="ident">top_down</span>: <span class="bool-val">false</span>,
<span class="ident">no_file_header</span>: <span class="bool-val">false</span>,
<span class="ident">add_alpha_channel</span>: <span class="bool-val">false</span>,
<span class="ident">has_loaded_metadata</span>: <span class="bool-val">false</span>,
<span class="ident">image_type</span>: <span class="ident">ImageType</span>::<span class="ident">Palette</span>,
<span class="ident">bit_count</span>: <span class="number">0</span>,
<span class="ident">colors_used</span>: <span class="number">0</span>,
<span class="ident">palette</span>: <span class="prelude-val">None</span>,
<span class="ident">bitfields</span>: <span class="prelude-val">None</span>,
};
<span class="ident">decoder</span>.<span class="ident">read_metadata_in_ico_format</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="ident">decoder</span>)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ico"</span>)]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">reader</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</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">fn</span> <span class="ident">read_file_header</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">if</span> <span class="self">self</span>.<span class="ident">no_file_header</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</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="number">2</span>];
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</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="string">b"BM"</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">"BMP signature not found"</span>.<span class="ident">to_string</span>(),
));
}
<span class="comment">// The next 8 bytes represent file size, followed the 4 reserved bytes</span>
<span class="comment">// We're not interesting these values</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="self">self</span>.<span class="ident">data_offset</span> <span class="op">=</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>()<span class="question-mark">?</span>);
<span class="prelude-val">Ok</span>(())
}
<span class="doccomment">/// Read BITMAPCOREHEADER https://msdn.microsoft.com/en-us/library/vs/alm/dd183372(v=vs.85).aspx</span>
<span class="doccomment">///</span>
<span class="doccomment">/// returns Err if any of the values are invalid.</span>
<span class="kw">fn</span> <span class="ident">read_bitmap_core_header</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="comment">// As height/width values in BMP files with core headers are only 16 bits long,</span>
<span class="comment">// they won't be larger than `MAX_WIDTH_HEIGHT`.</span>
<span class="self">self</span>.<span class="ident">width</span> <span class="op">=</span> <span class="ident">i32</span>::<span class="ident">from</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u16</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>()<span class="question-mark">?</span>);
<span class="self">self</span>.<span class="ident">height</span> <span class="op">=</span> <span class="ident">i32</span>::<span class="ident">from</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u16</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>()<span class="question-mark">?</span>);
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">check_for_overflow</span>(
<span class="self">self</span>.<span class="ident">width</span>,
<span class="self">self</span>.<span class="ident">height</span>,
<span class="self">self</span>.<span class="ident">num_channels</span>()
));
<span class="comment">// Number of planes (format specifies that this should be 1).</span>
<span class="kw">if</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u16</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>()) <span class="op">!</span><span class="op">=</span> <span class="number">1</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">"Invalid number of planes."</span>.<span class="ident">to_string</span>(),
));
}
<span class="self">self</span>.<span class="ident">bit_count</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u16</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="self">self</span>.<span class="ident">image_type</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">bit_count</span> {
<span class="number">1</span> <span class="op">|</span> <span class="number">4</span> <span class="op">|</span> <span class="number">8</span> <span class="op">=</span><span class="op">></span> <span class="ident">ImageType</span>::<span class="ident">Palette</span>,
<span class="number">24</span> <span class="op">=</span><span class="op">></span> <span class="ident">ImageType</span>::<span class="ident">RGB24</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="string">"Invalid bit count"</span>.<span class="ident">to_string</span>())),
};
<span class="prelude-val">Ok</span>(())
}
<span class="doccomment">/// Read BITMAPINFOHEADER https://msdn.microsoft.com/en-us/library/vs/alm/dd183376(v=vs.85).aspx</span>
<span class="doccomment">/// or BITMAPV{2|3|4|5}HEADER.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// returns Err if any of the values are invalid.</span>
<span class="kw">fn</span> <span class="ident">read_bitmap_info_header</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="self">self</span>.<span class="ident">width</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_i32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="self">self</span>.<span class="ident">height</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_i32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="comment">// Width can not be negative</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">width</span> <span class="op"><</span> <span class="number">0</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">"Negative width"</span>.<span class="ident">to_string</span>()));
} <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">width</span> <span class="op">></span> <span class="ident">MAX_WIDTH_HEIGHT</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="ident">MAX_WIDTH_HEIGHT</span> {
<span class="comment">// Limit very large image sizes to avoid OOM issues. Images with these sizes are</span>
<span class="comment">// unlikely to be valid anyhow.</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">"Image too large"</span>.<span class="ident">to_string</span>()));
}
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">height</span> <span class="op">=</span><span class="op">=</span> <span class="ident">i32</span>::<span class="ident">min_value</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">"Invalid height"</span>.<span class="ident">to_string</span>()));
}
<span class="comment">// A negative height indicates a top-down DIB.</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">height</span> <span class="op"><</span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">height</span> <span class="kw-2">*</span><span class="op">=</span> <span class="op">-</span><span class="number">1</span>;
<span class="self">self</span>.<span class="ident">top_down</span> <span class="op">=</span> <span class="bool-val">true</span>;
}
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">check_for_overflow</span>(
<span class="self">self</span>.<span class="ident">width</span>,
<span class="self">self</span>.<span class="ident">height</span>,
<span class="self">self</span>.<span class="ident">num_channels</span>()
));
<span class="comment">// Number of planes (format specifies that this should be 1).</span>
<span class="kw">if</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u16</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>()) <span class="op">!</span><span class="op">=</span> <span class="number">1</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">"Invalid number of planes."</span>.<span class="ident">to_string</span>(),
));
}
<span class="self">self</span>.<span class="ident">bit_count</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u16</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="kw">let</span> <span class="ident">image_type_u32</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="comment">// Top-down dibs can not be compressed.</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">top_down</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">image_type_u32</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> <span class="kw-2">&</span><span class="op">&</span> <span class="ident">image_type_u32</span> <span class="op">!</span><span class="op">=</span> <span class="number">3</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">"Invalid image type for top-down image."</span>.<span class="ident">to_string</span>(),
));
}
<span class="self">self</span>.<span class="ident">image_type</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">image_type_u32</span> {
<span class="number">0</span> <span class="op">=</span><span class="op">></span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">bit_count</span> {
<span class="number">1</span> <span class="op">|</span> <span class="number">4</span> <span class="op">|</span> <span class="number">8</span> <span class="op">=</span><span class="op">></span> <span class="ident">ImageType</span>::<span class="ident">Palette</span>,
<span class="number">16</span> <span class="op">=</span><span class="op">></span> <span class="ident">ImageType</span>::<span class="ident">RGB16</span>,
<span class="number">24</span> <span class="op">=</span><span class="op">></span> <span class="ident">ImageType</span>::<span class="ident">RGB24</span>,
<span class="number">32</span> <span class="op">=</span><span class="op">></span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">add_alpha_channel</span> {
<span class="ident">ImageType</span>::<span class="ident">RGBA32</span>
} <span class="kw">else</span> {
<span class="ident">ImageType</span>::<span class="ident">RGB32</span>
},
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(<span class="string">"Invalid RGB bit count"</span>.<span class="ident">to_string</span>())),
},
<span class="number">1</span> <span class="op">=</span><span class="op">></span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">bit_count</span> {
<span class="number">8</span> <span class="op">=</span><span class="op">></span> <span class="ident">ImageType</span>::<span class="ident">RLE8</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Invalid RLE8 bit count"</span>.<span class="ident">to_string</span>(),
))
}
},
<span class="number">2</span> <span class="op">=</span><span class="op">></span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">bit_count</span> {
<span class="number">4</span> <span class="op">=</span><span class="op">></span> <span class="ident">ImageType</span>::<span class="ident">RLE4</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Invalid RLE4 bit count"</span>.<span class="ident">to_string</span>(),
))
}
},
<span class="number">3</span> <span class="op">=</span><span class="op">></span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">bit_count</span> {
<span class="number">16</span> <span class="op">=</span><span class="op">></span> <span class="ident">ImageType</span>::<span class="ident">Bitfields16</span>,
<span class="number">32</span> <span class="op">=</span><span class="op">></span> <span class="ident">ImageType</span>::<span class="ident">Bitfields32</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">FormatError</span>(
<span class="string">"Invalid bitfields bit count"</span>.<span class="ident">to_string</span>(),
))
}
},
<span class="comment">// PNG and JPEG not implemented yet.</span>
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">UnsupportedError</span>(
<span class="string">"Unsupported image type"</span>.<span class="ident">to_string</span>(),
))
}
};
<span class="comment">// The next 12 bytes represent data array size in bytes,</span>
<span class="comment">// followed the horizontal and vertical printing resolutions</span>
<span class="comment">// We will calculate the pixel array size using width & height of image</span>
<span class="comment">// We're not interesting the horz or vert printing resolutions</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="self">self</span>.<span class="ident">colors_used</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="comment">// The next 4 bytes represent number of "important" colors</span>
<span class="comment">// We're not interested in this value, so we'll skip it</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn</span> <span class="ident">read_bitmasks</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">let</span> <span class="ident">r_mask</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="kw">let</span> <span class="ident">g_mask</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="kw">let</span> <span class="ident">b_mask</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="kw">let</span> <span class="ident">a_mask</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">bmp_header_type</span> {
<span class="ident">BMPHeaderType</span>::<span class="ident">V3</span> <span class="op">|</span> <span class="ident">BMPHeaderType</span>::<span class="ident">V4</span> <span class="op">|</span> <span class="ident">BMPHeaderType</span>::<span class="ident">V5</span> <span class="op">=</span><span class="op">></span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>())
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="number">0</span>,
};
<span class="self">self</span>.<span class="ident">bitfields</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">image_type</span> {
<span class="ident">ImageType</span>::<span class="ident">Bitfields16</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">Bitfields</span>::<span class="ident">from_mask</span>(
<span class="ident">r_mask</span>, <span class="ident">g_mask</span>, <span class="ident">b_mask</span>, <span class="ident">a_mask</span>, <span class="number">16</span>
))),
<span class="ident">ImageType</span>::<span class="ident">Bitfields32</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Some</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">Bitfields</span>::<span class="ident">from_mask</span>(
<span class="ident">r_mask</span>, <span class="ident">g_mask</span>, <span class="ident">b_mask</span>, <span class="ident">a_mask</span>, <span class="number">32</span>
))),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
};
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">bitfields</span>.<span class="ident">is_some</span>() <span class="kw-2">&</span><span class="op">&</span> <span class="ident">a_mask</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">add_alpha_channel</span> <span class="op">=</span> <span class="bool-val">true</span>;
}
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn</span> <span class="ident">read_metadata</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">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">has_loaded_metadata</span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">read_file_header</span>());
<span class="kw">let</span> <span class="ident">bmp_header_offset</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="number">0</span>)));
<span class="kw">let</span> <span class="ident">bmp_header_size</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="kw">let</span> <span class="ident">bmp_header_end</span> <span class="op">=</span> <span class="ident">bmp_header_offset</span> <span class="op">+</span> <span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">bmp_header_size</span>);
<span class="self">self</span>.<span class="ident">bmp_header_type</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">bmp_header_size</span> {
<span class="ident">BITMAPCOREHEADER_SIZE</span> <span class="op">=</span><span class="op">></span> <span class="ident">BMPHeaderType</span>::<span class="ident">Core</span>,
<span class="ident">BITMAPINFOHEADER_SIZE</span> <span class="op">=</span><span class="op">></span> <span class="ident">BMPHeaderType</span>::<span class="ident">Info</span>,
<span class="ident">BITMAPV2HEADER_SIZE</span> <span class="op">=</span><span class="op">></span> <span class="ident">BMPHeaderType</span>::<span class="ident">V2</span>,
<span class="ident">BITMAPV3HEADER_SIZE</span> <span class="op">=</span><span class="op">></span> <span class="ident">BMPHeaderType</span>::<span class="ident">V3</span>,
<span class="ident">BITMAPV4HEADER_SIZE</span> <span class="op">=</span><span class="op">></span> <span class="ident">BMPHeaderType</span>::<span class="ident">V4</span>,
<span class="ident">BITMAPV5HEADER_SIZE</span> <span class="op">=</span><span class="op">></span> <span class="ident">BMPHeaderType</span>::<span class="ident">V5</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ImageError</span>::<span class="ident">UnsupportedError</span>(
<span class="string">"Unsupported Bitmap Header"</span>.<span class="ident">to_string</span>(),
))
}
};
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">bmp_header_type</span> {
<span class="ident">BMPHeaderType</span>::<span class="ident">Core</span> <span class="op">=</span><span class="op">></span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">read_bitmap_core_header</span>());
}
<span class="ident">BMPHeaderType</span>::<span class="ident">Info</span>
<span class="op">|</span> <span class="ident">BMPHeaderType</span>::<span class="ident">V2</span>
<span class="op">|</span> <span class="ident">BMPHeaderType</span>::<span class="ident">V3</span>
<span class="op">|</span> <span class="ident">BMPHeaderType</span>::<span class="ident">V4</span>
<span class="op">|</span> <span class="ident">BMPHeaderType</span>::<span class="ident">V5</span> <span class="op">=</span><span class="op">></span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">read_bitmap_info_header</span>());
}
};
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">image_type</span> {
<span class="ident">ImageType</span>::<span class="ident">Bitfields16</span> <span class="op">|</span> <span class="ident">ImageType</span>::<span class="ident">Bitfields32</span> <span class="op">=</span><span class="op">></span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">read_bitmasks</span>()),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {}
};
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Start</span>(<span class="ident">bmp_header_end</span>)));
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">image_type</span> {
<span class="ident">ImageType</span>::<span class="ident">Palette</span> <span class="op">|</span> <span class="ident">ImageType</span>::<span class="ident">RLE4</span> <span class="op">|</span> <span class="ident">ImageType</span>::<span class="ident">RLE8</span> <span class="op">=</span><span class="op">></span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">read_palette</span>()),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {}
};
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">no_file_header</span> {
<span class="comment">// Use the offset of the end of metadata instead of reading a BMP file header.</span>
<span class="self">self</span>.<span class="ident">data_offset</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="number">0</span>)));
}
<span class="self">self</span>.<span class="ident">has_loaded_metadata</span> <span class="op">=</span> <span class="bool-val">true</span>;
}
<span class="prelude-val">Ok</span>(())
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ico"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">read_metadata_in_ico_format</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="self">self</span>.<span class="ident">no_file_header</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="self">self</span>.<span class="ident">add_alpha_channel</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">read_metadata</span>());
<span class="comment">// The height field in an ICO file is doubled to account for the AND mask</span>
<span class="comment">// (whether or not an AND mask is actually present).</span>
<span class="self">self</span>.<span class="ident">height</span> <span class="op">/</span><span class="op">=</span> <span class="number">2</span>;
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn</span> <span class="ident">get_palette_size</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="ident">usize</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">colors_used</span> {
<span class="number">0</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="self">self</span>.<span class="ident">bit_count</span>),
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">colors_used</span> <span class="op">></span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="self">self</span>.<span class="ident">bit_count</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">"Palette size {} exceeds maximum size for BMP with bit count of {}"</span>,
<span class="self">self</span>.<span class="ident">colors_used</span>, <span class="self">self</span>.<span class="ident">bit_count</span>
)));
}
<span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">colors_used</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
}
}
<span class="kw">fn</span> <span class="ident">bytes_per_color</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="kw">match</span> <span class="self">self</span>.<span class="ident">bmp_header_type</span> {
<span class="ident">BMPHeaderType</span>::<span class="ident">Core</span> <span class="op">=</span><span class="op">></span> <span class="number">3</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="number">4</span>,
}
}
<span class="kw">fn</span> <span class="ident">read_palette</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">const</span> <span class="ident">MAX_PALETTE_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">256</span>; <span class="comment">// Palette indices are u8.</span>
<span class="kw">let</span> <span class="ident">bytes_per_color</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bytes_per_color</span>();
<span class="kw">let</span> <span class="ident">palette_size</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">get_palette_size</span>());
<span class="kw">let</span> <span class="ident">max_length</span> <span class="op">=</span> <span class="ident">MAX_PALETTE_SIZE</span> <span class="op">*</span> <span class="ident">bytes_per_color</span>;
<span class="kw">let</span> <span class="ident">length</span> <span class="op">=</span> <span class="ident">palette_size</span> <span class="op">*</span> <span class="ident">bytes_per_color</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="ident">with_capacity</span>(<span class="ident">max_length</span>);
<span class="comment">// Resize and read the palette entries to the buffer.</span>
<span class="comment">// We limit the buffer to at most 256 colours to avoid any oom issues as</span>
<span class="comment">// 8-bit images can't reference more than 256 indexes anyhow.</span>
<span class="ident">buf</span>.<span class="ident">resize</span>(<span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">length</span>, <span class="ident">max_length</span>), <span class="number">0</span>);
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">by_ref</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="comment">// Allocate 256 entries even if palette_size is smaller, to prevent corrupt files from</span>
<span class="comment">// causing an out-of-bounds array access.</span>
<span class="kw">if</span> <span class="ident">length</span> <span class="op"><</span> <span class="ident">max_length</span> {
<span class="ident">buf</span>.<span class="ident">resize</span>(<span class="ident">max_length</span>, <span class="number">0</span>);
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">length</span> <span class="op">></span> <span class="ident">max_length</span> {
<span class="comment">// Ignore any excess palette colors.</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>((<span class="ident">length</span> <span class="op">-</span> <span class="ident">max_length</span>) <span class="kw">as</span> <span class="ident">i64</span>)));
};
<span class="kw">let</span> <span class="ident">p</span>: <span class="ident">Vec</span><span class="op"><</span>(<span class="ident">u8</span>, <span class="ident">u8</span>, <span class="ident">u8</span>)<span class="op">></span> <span class="op">=</span> (<span class="number">0</span>..<span class="ident">MAX_PALETTE_SIZE</span>)
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">buf</span>[<span class="ident">bytes_per_color</span> <span class="op">*</span> <span class="ident">i</span>];
<span class="kw">let</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">buf</span>[<span class="ident">bytes_per_color</span> <span class="op">*</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>];
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">buf</span>[<span class="ident">bytes_per_color</span> <span class="op">*</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">2</span>];
(<span class="ident">r</span>, <span class="ident">g</span>, <span class="ident">b</span>)
})
.<span class="ident">collect</span>();
<span class="self">self</span>.<span class="ident">palette</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">p</span>);
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn</span> <span class="ident">num_channels</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="kw">if</span> <span class="self">self</span>.<span class="ident">add_alpha_channel</span> {
<span class="number">4</span>
} <span class="kw">else</span> {
<span class="number">3</span>
}
}
<span class="doccomment">/// Create a buffer to hold the decoded pixel data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The buffer will be large enough to hold the whole image if it requires less than</span>
<span class="doccomment">/// `MAX_INITIAL_PIXELS` times the number of channels bytes (adjusted to line up with the</span>
<span class="doccomment">/// width of a row).</span>
<span class="kw">fn</span> <span class="ident">create_pixel_data</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">row_width</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_channels</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">max_pixels</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_channels</span>() <span class="op">*</span> <span class="ident">MAX_INITIAL_PIXELS</span>;
<span class="comment">// Make sure the maximum size is whole number of rows.</span>
<span class="kw">let</span> <span class="ident">max_starting_size</span> <span class="op">=</span> <span class="ident">max_pixels</span> <span class="op">+</span> <span class="ident">row_width</span> <span class="op">-</span> (<span class="ident">max_pixels</span> <span class="op">%</span> <span class="ident">row_width</span>);
<span class="comment">// The buffer has its bytes initially set to 0xFF as the ICO decoder relies on it.</span>
<span class="macro">vec</span><span class="macro">!</span>[<span class="number">0xFF</span>; <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">row_width</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="ident">max_starting_size</span>)]
}
<span class="kw">fn</span> <span class="ident">rows</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">pixel_data</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">RowIterator</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">stride</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">num_channels</span>();
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">top_down</span> {
<span class="ident">RowIterator</span> {
<span class="ident">chunks</span>: <span class="ident">Chunker</span>::<span class="ident">FromTop</span>(<span class="ident">pixel_data</span>.<span class="ident">chunks_mut</span>(<span class="ident">stride</span>)),
}
} <span class="kw">else</span> {
<span class="ident">RowIterator</span> {
<span class="ident">chunks</span>: <span class="ident">Chunker</span>::<span class="ident">FromBottom</span>(<span class="ident">pixel_data</span>.<span class="ident">chunks_mut</span>(<span class="ident">stride</span>).<span class="ident">rev</span>()),
}
}
}
<span class="kw">fn</span> <span class="ident">read_palettized_pixel_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="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pixel_data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">create_pixel_data</span>();
<span class="kw">let</span> <span class="ident">num_channels</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_channels</span>();
<span class="kw">let</span> <span class="ident">row_byte_length</span> <span class="op">=</span> ((<span class="ident">i32</span>::<span class="ident">from</span>(<span class="self">self</span>.<span class="ident">bit_count</span>) <span class="op">*</span> <span class="self">self</span>.<span class="ident">width</span> <span class="op">+</span> <span class="number">31</span>) <span class="op">/</span> <span class="number">32</span> <span class="op">*</span> <span class="number">4</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">indices</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>; <span class="ident">row_byte_length</span>];
<span class="kw">let</span> <span class="ident">palette</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">palette</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">bit_count</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bit_count</span>;
<span class="kw">let</span> <span class="ident">reader</span> <span class="op">=</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">let</span> <span class="ident">width</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="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Start</span>(<span class="self">self</span>.<span class="ident">data_offset</span>)));
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">with_rows</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_data</span>,
<span class="self">self</span>.<span class="ident">width</span>,
<span class="self">self</span>.<span class="ident">height</span>,
<span class="ident">num_channels</span>,
<span class="self">self</span>.<span class="ident">top_down</span>,
<span class="op">|</span><span class="ident">row</span><span class="op">|</span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">indices</span>));
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pixel_iter</span> <span class="op">=</span> <span class="ident">row</span>.<span class="ident">chunks_mut</span>(<span class="ident">num_channels</span>);
<span class="kw">match</span> <span class="ident">bit_count</span> {
<span class="number">1</span> <span class="op">=</span><span class="op">></span> {
<span class="ident">set_1bit_pixel_run</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_iter</span>, <span class="ident">palette</span>, <span class="ident">indices</span>.<span class="ident">iter</span>());
}
<span class="number">4</span> <span class="op">=</span><span class="op">></span> {
<span class="ident">set_4bit_pixel_run</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_iter</span>, <span class="ident">palette</span>, <span class="ident">indices</span>.<span class="ident">iter</span>(), <span class="ident">width</span>);
}
<span class="number">8</span> <span class="op">=</span><span class="op">></span> {
<span class="ident">set_8bit_pixel_run</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_iter</span>, <span class="ident">palette</span>, <span class="ident">indices</span>.<span class="ident">iter</span>(), <span class="ident">width</span>);
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(),
};
<span class="prelude-val">Ok</span>(())
}
));
<span class="prelude-val">Ok</span>(<span class="ident">pixel_data</span>)
}
<span class="kw">fn</span> <span class="ident">read_16_bit_pixel_data</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bitfields</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Bitfields</span><span class="op">></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">let</span> <span class="kw-2">mut</span> <span class="ident">pixel_data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">create_pixel_data</span>();
<span class="kw">let</span> <span class="ident">num_channels</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_channels</span>();
<span class="kw">let</span> <span class="ident">row_padding_len</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="number">2</span> <span class="op">*</span> <span class="number">2</span>;
<span class="kw">let</span> <span class="ident">row_padding</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="number">0</span>; <span class="number">2</span>][..<span class="ident">row_padding_len</span>];
<span class="kw">let</span> <span class="ident">bitfields</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">bitfields</span> {
<span class="prelude-val">Some</span>(<span class="ident">b</span>) <span class="op">=</span><span class="op">></span> <span class="ident">b</span>,
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">bitfields</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap</span>(),
};
<span class="kw">let</span> <span class="ident">reader</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">r</span>;
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Start</span>(<span class="self">self</span>.<span class="ident">data_offset</span>)));
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">with_rows</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_data</span>,
<span class="self">self</span>.<span class="ident">width</span>,
<span class="self">self</span>.<span class="ident">height</span>,
<span class="ident">num_channels</span>,
<span class="self">self</span>.<span class="ident">top_down</span>,
<span class="op">|</span><span class="ident">row</span><span class="op">|</span> {
<span class="kw">for</span> <span class="ident">pixel</span> <span class="kw">in</span> <span class="ident">row</span>.<span class="ident">chunks_mut</span>(<span class="ident">num_channels</span>) {
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">u32</span>::<span class="ident">from</span>(<span class="ident">reader</span>.<span class="ident">read_u16</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>()<span class="question-mark">?</span>);
<span class="ident">pixel</span>[<span class="number">0</span>] <span class="op">=</span> <span class="ident">bitfields</span>.<span class="ident">r</span>.<span class="ident">read</span>(<span class="ident">data</span>);
<span class="ident">pixel</span>[<span class="number">1</span>] <span class="op">=</span> <span class="ident">bitfields</span>.<span class="ident">g</span>.<span class="ident">read</span>(<span class="ident">data</span>);
<span class="ident">pixel</span>[<span class="number">2</span>] <span class="op">=</span> <span class="ident">bitfields</span>.<span class="ident">b</span>.<span class="ident">read</span>(<span class="ident">data</span>);
<span class="kw">if</span> <span class="ident">num_channels</span> <span class="op">=</span><span class="op">=</span> <span class="number">4</span> {
<span class="ident">pixel</span>[<span class="number">3</span>] <span class="op">=</span> <span class="ident">bitfields</span>.<span class="ident">a</span>.<span class="ident">read</span>(<span class="ident">data</span>);
}
}
<span class="ident">reader</span>.<span class="ident">read_exact</span>(<span class="ident">row_padding</span>)
}
));
<span class="prelude-val">Ok</span>(<span class="ident">pixel_data</span>)
}
<span class="doccomment">/// Read image data from a reader in 32-bit formats that use bitfields.</span>
<span class="kw">fn</span> <span class="ident">read_32_bit_pixel_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="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pixel_data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">create_pixel_data</span>();
<span class="kw">let</span> <span class="ident">num_channels</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_channels</span>();
<span class="kw">let</span> <span class="ident">bitfields</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bitfields</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">reader</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">r</span>;
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Start</span>(<span class="self">self</span>.<span class="ident">data_offset</span>)));
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">with_rows</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_data</span>,
<span class="self">self</span>.<span class="ident">width</span>,
<span class="self">self</span>.<span class="ident">height</span>,
<span class="ident">num_channels</span>,
<span class="self">self</span>.<span class="ident">top_down</span>,
<span class="op">|</span><span class="ident">row</span><span class="op">|</span> {
<span class="kw">for</span> <span class="ident">pixel</span> <span class="kw">in</span> <span class="ident">row</span>.<span class="ident">chunks_mut</span>(<span class="ident">num_channels</span>) {
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read_u32</span>::<span class="op"><</span><span class="ident">LittleEndian</span><span class="op">></span>());
<span class="ident">pixel</span>[<span class="number">0</span>] <span class="op">=</span> <span class="ident">bitfields</span>.<span class="ident">r</span>.<span class="ident">read</span>(<span class="ident">data</span>);
<span class="ident">pixel</span>[<span class="number">1</span>] <span class="op">=</span> <span class="ident">bitfields</span>.<span class="ident">g</span>.<span class="ident">read</span>(<span class="ident">data</span>);
<span class="ident">pixel</span>[<span class="number">2</span>] <span class="op">=</span> <span class="ident">bitfields</span>.<span class="ident">b</span>.<span class="ident">read</span>(<span class="ident">data</span>);
<span class="kw">if</span> <span class="ident">num_channels</span> <span class="op">=</span><span class="op">=</span> <span class="number">4</span> {
<span class="ident">pixel</span>[<span class="number">3</span>] <span class="op">=</span> <span class="ident">bitfields</span>.<span class="ident">a</span>.<span class="ident">read</span>(<span class="ident">data</span>);
}
}
<span class="prelude-val">Ok</span>(())
}
));
<span class="prelude-val">Ok</span>(<span class="ident">pixel_data</span>)
}
<span class="doccomment">/// Read image data from a reader where the colours are stored as 8-bit values (24 or 32-bit).</span>
<span class="kw">fn</span> <span class="ident">read_full_byte_pixel_data</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">format</span>: <span class="kw-2">&</span><span class="ident">FormatFullBytes</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">let</span> <span class="kw-2">mut</span> <span class="ident">pixel_data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">create_pixel_data</span>();
<span class="kw">let</span> <span class="ident">num_channels</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_channels</span>();
<span class="kw">let</span> <span class="ident">row_padding_len</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">format</span> {
<span class="ident">FormatFullBytes</span>::<span class="ident">RGB24</span> <span class="op">=</span><span class="op">></span> (<span class="number">4</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="number">3</span>) <span class="op">%</span> <span class="number">4</span>) <span class="op">%</span> <span class="number">4</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="number">0</span>,
};
<span class="kw">let</span> <span class="ident">row_padding</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="number">0</span>; <span class="number">4</span>][..<span class="ident">row_padding_len</span>];
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Start</span>(<span class="self">self</span>.<span class="ident">data_offset</span>)));
<span class="kw">let</span> <span class="ident">reader</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">r</span>;
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">with_rows</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_data</span>,
<span class="self">self</span>.<span class="ident">width</span>,
<span class="self">self</span>.<span class="ident">height</span>,
<span class="ident">num_channels</span>,
<span class="self">self</span>.<span class="ident">top_down</span>,
<span class="op">|</span><span class="ident">row</span><span class="op">|</span> {
<span class="kw">for</span> <span class="ident">pixel</span> <span class="kw">in</span> <span class="ident">row</span>.<span class="ident">chunks_mut</span>(<span class="ident">num_channels</span>) {
<span class="kw">if</span> <span class="kw-2">*</span><span class="ident">format</span> <span class="op">=</span><span class="op">=</span> <span class="ident">FormatFullBytes</span>::<span class="ident">Format888</span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read_u8</span>());
}
<span class="comment">// Read the colour values (b, g, r).</span>
<span class="comment">// Reading 3 bytes and reversing them is significantly faster than reading one</span>
<span class="comment">// at a time.</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel</span>[<span class="number">0</span>..<span class="number">3</span>]));
<span class="ident">pixel</span>[<span class="number">0</span>..<span class="number">3</span>].<span class="ident">reverse</span>();
<span class="kw">if</span> <span class="kw-2">*</span><span class="ident">format</span> <span class="op">=</span><span class="op">=</span> <span class="ident">FormatFullBytes</span>::<span class="ident">RGB32</span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read_u8</span>());
}
<span class="comment">// Read the alpha channel if present</span>
<span class="kw">if</span> <span class="kw-2">*</span><span class="ident">format</span> <span class="op">=</span><span class="op">=</span> <span class="ident">FormatFullBytes</span>::<span class="ident">RGBA32</span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel</span>[<span class="number">3</span>..<span class="number">4</span>]));
}
}
<span class="ident">reader</span>.<span class="ident">read_exact</span>(<span class="ident">row_padding</span>)
}
));
<span class="prelude-val">Ok</span>(<span class="ident">pixel_data</span>)
}
<span class="kw">fn</span> <span class="ident">read_rle_data</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">image_type</span>: <span class="ident">ImageType</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="comment">// Seek to the start of the actual image data.</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Start</span>(<span class="self">self</span>.<span class="ident">data_offset</span>)));
<span class="kw">let</span> <span class="ident">full_image_size</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(
<span class="ident">num_bytes</span>(<span class="self">self</span>.<span class="ident">width</span>, <span class="self">self</span>.<span class="ident">height</span>, <span class="self">self</span>.<span class="ident">num_channels</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="string">"Image buffer would be too large!"</span>.<span class="ident">to_owned</span>())
})
);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pixel_data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">create_pixel_data</span>();
<span class="kw">let</span> (<span class="ident">skip_pixels</span>, <span class="ident">skip_rows</span>, <span class="ident">eof_hit</span>) <span class="op">=</span>
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">read_rle_data_step</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_data</span>, <span class="ident">image_type</span>, <span class="number">0</span>, <span class="number">0</span>));
<span class="comment">// Extend the buffer if there is still data left.</span>
<span class="comment">// If eof_hit is true, it means that we hit an end-of-file marker in the last step and</span>
<span class="comment">// we won't extend the buffer further to avoid small files with a large specified size causing memory issues.</span>
<span class="comment">// This is only a rudimentary check, a file could still create a large buffer, but the</span>
<span class="comment">// file would now have to at least have some data in it.</span>
<span class="kw">if</span> <span class="ident">pixel_data</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">full_image_size</span> <span class="kw-2">&</span><span class="op">&</span> <span class="op">!</span><span class="ident">eof_hit</span> {
<span class="kw">let</span> <span class="ident">new</span> <span class="op">=</span> <span class="ident">extend_buffer</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_data</span>, <span class="ident">full_image_size</span>, <span class="bool-val">true</span>);
<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">read_rle_data_step</span>(<span class="ident">new</span>, <span class="ident">image_type</span>, <span class="ident">skip_pixels</span>, <span class="ident">skip_rows</span>));
}
<span class="prelude-val">Ok</span>(<span class="ident">pixel_data</span>)
}
<span class="kw">fn</span> <span class="ident">read_rle_data_step</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="kw-2">mut</span> <span class="ident">pixel_data</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>],
<span class="ident">image_type</span>: <span class="ident">ImageType</span>,
<span class="ident">skip_pixels</span>: <span class="ident">u8</span>,
<span class="ident">skip_rows</span>: <span class="ident">u8</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">ImageResult</span><span class="op"><</span>(<span class="ident">u8</span>, <span class="ident">u8</span>, <span class="ident">bool</span>)<span class="op">></span> {
<span class="kw">let</span> <span class="ident">num_channels</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">num_channels</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">delta_rows_left</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">delta_pixels_left</span> <span class="op">=</span> <span class="ident">skip_pixels</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">eof_hit</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="comment">// Scope the borrowing of pixel_data by the row iterator.</span>
{
<span class="comment">// Handling deltas in the RLE scheme means that we need to manually</span>
<span class="comment">// iterate through rows and pixels. Even if we didn't have to handle</span>
<span class="comment">// deltas, we have to ensure that a single runlength doesn't straddle</span>
<span class="comment">// two rows.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">row_iter</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">rows</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_data</span>);
<span class="comment">// If we have previously hit a delta value,</span>
<span class="comment">// blank the rows that are to be skipped.</span>
<span class="ident">blank_bytes</span>((<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">row_iter</span>).<span class="ident">take</span>(<span class="ident">skip_rows</span>.<span class="ident">into</span>()));
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">insns_iter</span> <span class="op">=</span> <span class="ident">RLEInsnIterator</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">r</span>,
<span class="ident">image_type</span>,
};
<span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">palette</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap</span>();
<span class="lifetime">'row_loop</span>: <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">row</span>) <span class="op">=</span> <span class="ident">row_iter</span>.<span class="ident">next</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pixel_iter</span> <span class="op">=</span> <span class="ident">row</span>.<span class="ident">chunks_mut</span>(<span class="ident">num_channels</span>);
<span class="comment">// Blank delta skipped pixels if any.</span>
<span class="ident">blank_bytes</span>((<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_iter</span>).<span class="ident">take</span>(<span class="ident">delta_pixels_left</span>.<span class="ident">into</span>()));
<span class="ident">delta_pixels_left</span> <span class="op">=</span> <span class="number">0</span>;
<span class="lifetime">'rle_loop</span>: <span class="kw">loop</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">insn</span>) <span class="op">=</span> <span class="ident">insns_iter</span>.<span class="ident">next</span>() {
<span class="kw">match</span> <span class="ident">insn</span> {
<span class="ident">RLEInsn</span>::<span class="ident">EndOfFile</span> <span class="op">=</span><span class="op">></span> {
<span class="ident">blank_bytes</span>(<span class="ident">pixel_iter</span>);
<span class="ident">blank_bytes</span>(<span class="ident">row_iter</span>);
<span class="ident">eof_hit</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">break</span> <span class="lifetime">'row_loop</span>;
}
<span class="ident">RLEInsn</span>::<span class="ident">EndOfRow</span> <span class="op">=</span><span class="op">></span> {
<span class="ident">blank_bytes</span>(<span class="ident">pixel_iter</span>);
<span class="kw">break</span> <span class="lifetime">'rle_loop</span>;
}
<span class="ident">RLEInsn</span>::<span class="ident">Delta</span>(<span class="ident">x_delta</span>, <span class="ident">y_delta</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">y_delta</span> <span class="op">></span> <span class="number">0</span> {
<span class="kw">for</span> <span class="ident">n</span> <span class="kw">in</span> <span class="number">1</span>..<span class="ident">y_delta</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">row</span>) <span class="op">=</span> <span class="ident">row_iter</span>.<span class="ident">next</span>() {
<span class="comment">// The msdn site on bitmap compression doesn't specify</span>
<span class="comment">// what happens to the values skipped when encountering</span>
<span class="comment">// a delta code, however IE and the windows image</span>
<span class="comment">// preview seems to replace them with black pixels,</span>
<span class="comment">// so we stick to that.</span>
<span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> <span class="ident">row</span> {
<span class="kw-2">*</span><span class="ident">b</span> <span class="op">=</span> <span class="number">0</span>;
}
} <span class="kw">else</span> {
<span class="ident">delta_pixels_left</span> <span class="op">=</span> <span class="ident">x_delta</span>;
<span class="comment">// We've reached the end of the buffer.</span>
<span class="ident">delta_rows_left</span> <span class="op">=</span> <span class="ident">y_delta</span> <span class="op">-</span> <span class="ident">n</span>;
<span class="kw">break</span> <span class="lifetime">'row_loop</span>;
}
}
}
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">x_delta</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">pixel</span>) <span class="op">=</span> <span class="ident">pixel_iter</span>.<span class="ident">next</span>() {
<span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> <span class="ident">pixel</span> {
<span class="kw-2">*</span><span class="ident">b</span> <span class="op">=</span> <span class="number">0</span>;
}
} <span class="kw">else</span> {
<span class="comment">// We can't go any further in this row.</span>
<span class="kw">break</span>;
}
}
}
<span class="ident">RLEInsn</span>::<span class="ident">Absolute</span>(<span class="ident">length</span>, <span class="ident">indices</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// Absolute mode cannot span rows, so if we run</span>
<span class="comment">// out of pixels to process, we should stop</span>
<span class="comment">// processing the image.</span>
<span class="kw">match</span> <span class="ident">image_type</span> {
<span class="ident">ImageType</span>::<span class="ident">RLE8</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">set_8bit_pixel_run</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_iter</span>,
<span class="ident">p</span>,
<span class="ident">indices</span>.<span class="ident">iter</span>(),
<span class="ident">length</span> <span class="kw">as</span> <span class="ident">usize</span>,
) {
<span class="kw">break</span> <span class="lifetime">'row_loop</span>;
}
}
<span class="ident">ImageType</span>::<span class="ident">RLE4</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">set_4bit_pixel_run</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_iter</span>,
<span class="ident">p</span>,
<span class="ident">indices</span>.<span class="ident">iter</span>(),
<span class="ident">length</span> <span class="kw">as</span> <span class="ident">usize</span>,
) {
<span class="kw">break</span> <span class="lifetime">'row_loop</span>;
}
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(),
}
}
<span class="ident">RLEInsn</span>::<span class="ident">PixelRun</span>(<span class="ident">n_pixels</span>, <span class="ident">palette_index</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// A pixel run isn't allowed to span rows, but we</span>
<span class="comment">// simply continue on to the next row if we run</span>
<span class="comment">// out of pixels to set.</span>
<span class="kw">match</span> <span class="ident">image_type</span> {
<span class="ident">ImageType</span>::<span class="ident">RLE8</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">set_8bit_pixel_run</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_iter</span>,
<span class="ident">p</span>,
<span class="ident">repeat</span>(<span class="kw-2">&</span><span class="ident">palette_index</span>),
<span class="ident">n_pixels</span> <span class="kw">as</span> <span class="ident">usize</span>,
) {
<span class="kw">break</span> <span class="lifetime">'rle_loop</span>;
}
}
<span class="ident">ImageType</span>::<span class="ident">RLE4</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">set_4bit_pixel_run</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">pixel_iter</span>,
<span class="ident">p</span>,
<span class="ident">repeat</span>(<span class="kw-2">&</span><span class="ident">palette_index</span>),
<span class="ident">n_pixels</span> <span class="kw">as</span> <span class="ident">usize</span>,
) {
<span class="kw">break</span> <span class="lifetime">'rle_loop</span>;
}
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(),
}
}
}
} <span class="kw">else</span> {
<span class="comment">// We ran out of data while we still had rows to fill in.</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">"Not enough RLE data"</span>.<span class="ident">to_string</span>()));
}
}
}
}
<span class="prelude-val">Ok</span>((<span class="ident">delta_pixels_left</span>, <span class="ident">delta_rows_left</span>, <span class="ident">eof_hit</span>))
}
<span class="doccomment">/// Read the actual data of the image. This function is deliberately not public because it</span>
<span class="doccomment">/// cannot be called multiple times without seeking back the underlying reader in between.</span>
<span class="kw">pub</span>(<span class="kw">crate</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="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">image_type</span> {
<span class="ident">ImageType</span>::<span class="ident">Palette</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_palettized_pixel_data</span>(),
<span class="ident">ImageType</span>::<span class="ident">RGB16</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_16_bit_pixel_data</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">R5_G5_B5_COLOR_MASK</span>)),
<span class="ident">ImageType</span>::<span class="ident">RGB24</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_full_byte_pixel_data</span>(<span class="kw-2">&</span><span class="ident">FormatFullBytes</span>::<span class="ident">RGB24</span>),
<span class="ident">ImageType</span>::<span class="ident">RGB32</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_full_byte_pixel_data</span>(<span class="kw-2">&</span><span class="ident">FormatFullBytes</span>::<span class="ident">RGB32</span>),
<span class="ident">ImageType</span>::<span class="ident">RGBA32</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_full_byte_pixel_data</span>(<span class="kw-2">&</span><span class="ident">FormatFullBytes</span>::<span class="ident">RGBA32</span>),
<span class="ident">ImageType</span>::<span class="ident">RLE8</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_rle_data</span>(<span class="ident">ImageType</span>::<span class="ident">RLE8</span>),
<span class="ident">ImageType</span>::<span class="ident">RLE4</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_rle_data</span>(<span class="ident">ImageType</span>::<span class="ident">RLE4</span>),
<span class="ident">ImageType</span>::<span class="ident">Bitfields16</span> <span class="op">=</span><span class="op">></span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">bitfields</span> {
<span class="prelude-val">Some</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_16_bit_pixel_data</span>(<span class="prelude-val">None</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">FormatError</span>(
<span class="string">"Missing 16-bit bitfield masks"</span>.<span class="ident">to_string</span>(),
)),
},
<span class="ident">ImageType</span>::<span class="ident">Bitfields32</span> <span class="op">=</span><span class="op">></span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">bitfields</span> {
<span class="prelude-val">Some</span>(<span class="ident">R8_G8_B8_COLOR_MASK</span>) <span class="op">=</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">read_full_byte_pixel_data</span>(<span class="kw-2">&</span><span class="ident">FormatFullBytes</span>::<span class="ident">Format888</span>)
}
<span class="prelude-val">Some</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">read_32_bit_pixel_data</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">FormatError</span>(
<span class="string">"Missing 32-bit bitfield masks"</span>.<span class="ident">to_string</span>(),
)),
},
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span> <span class="op">+</span> <span class="ident">Seek</span><span class="op">></span> <span class="ident">ImageDecoder</span> <span class="kw">for</span> <span class="ident">BMPDecoder</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">width</span> <span class="kw">as</span> <span class="ident">u64</span>, <span class="self">self</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="kw">if</span> <span class="self">self</span>.<span class="ident">add_alpha_channel</span> {
<span class="ident">ColorType</span>::<span class="ident">RGBA</span>(<span class="number">8</span>)
} <span class="kw">else</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="self">self</span>.<span class="ident">read_image_data</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</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">BMPDecoder</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">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">r</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="number">0</span>))<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_image_data</span>();
<span class="self">self</span>.<span class="ident">r</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Start</span>(<span class="ident">start</span>))<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">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="kw">_</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="ident">data</span>); <span class="prelude-val">Ok</span>(<span class="ident">buf</span>.<span class="ident">len</span>()) })<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(())
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Bitfield</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_bitfield_len</span>() {
<span class="kw">for</span> <span class="ident">len</span> <span class="kw">in</span> <span class="number">1</span>..<span class="number">9</span> {
<span class="kw">let</span> <span class="ident">bitfield</span> <span class="op">=</span> <span class="ident">Bitfield</span> { <span class="ident">shift</span>: <span class="number">0</span>, <span class="ident">len</span> };
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..(<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="ident">len</span>) {
<span class="kw">let</span> <span class="ident">read</span> <span class="op">=</span> <span class="ident">bitfield</span>.<span class="ident">read</span>(<span class="ident">i</span>);
<span class="kw">let</span> <span class="ident">calc</span> <span class="op">=</span> (<span class="ident">i</span> <span class="kw">as</span> <span class="ident">f64</span> <span class="op">/</span> ((<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="ident">len</span>) <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">f64</span> <span class="op">*</span> <span class="number">255f64</span>).<span class="ident">round</span>() <span class="kw">as</span> <span class="ident">u8</span>;
<span class="kw">if</span> <span class="ident">read</span> <span class="op">!</span><span class="op">=</span> <span class="ident">calc</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"len:{} i:{} read:{} calc:{}"</span>, <span class="ident">len</span>, <span class="ident">i</span>, <span class="ident">read</span>, <span class="ident">calc</span>);
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">read</span>, <span class="ident">calc</span>);
}
}
}
}
</pre></div>
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