<!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/winit-0.19.1/src/icon.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>icon.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='../../winit/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">fmt</span>, <span class="ident">mem</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"icon_loading"</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">BufRead</span>, <span class="ident">Seek</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"icon_loading"</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">path</span>::<span class="ident">Path</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"icon_loading"</span>)]</span>
<span class="kw">use</span> <span class="ident">image</span>;
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct</span> <span class="ident">Pixel</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">r</span>: <span class="ident">u8</span>,
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">g</span>: <span class="ident">u8</span>,
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">b</span>: <span class="ident">u8</span>,
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">a</span>: <span class="ident">u8</span>,
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const</span> <span class="ident">PIXEL_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">Pixel</span><span class="op">></span>();
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="doccomment">/// An error produced when using `Icon::from_rgba` with invalid arguments.</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">BadIcon</span> {
<span class="doccomment">/// Produced when the length of the `rgba` argument isn't divisible by 4, thus `rgba` can't be</span>
<span class="doccomment">/// safely interpreted as 32bpp RGBA pixels.</span>
<span class="ident">ByteCountNotDivisibleBy4</span> {
<span class="ident">byte_count</span>: <span class="ident">usize</span>,
},
<span class="doccomment">/// Produced when the number of pixels (`rgba.len() / 4`) isn't equal to `width * height`.</span>
<span class="doccomment">/// At least one of your arguments is incorrect.</span>
<span class="ident">DimensionsVsPixelCount</span> {
<span class="ident">width</span>: <span class="ident">u32</span>,
<span class="ident">height</span>: <span class="ident">u32</span>,
<span class="ident">width_x_height</span>: <span class="ident">usize</span>,
<span class="ident">pixel_count</span>: <span class="ident">usize</span>,
},
}
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">BadIcon</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span> {
<span class="kw-2">&</span><span class="ident">BadIcon</span>::<span class="ident">ByteCountNotDivisibleBy4</span> { <span class="ident">byte_count</span> } <span class="op">=</span><span class="op">></span> <span class="macro">format</span><span class="macro">!</span>(
<span class="string">"The length of the `rgba` argument ({:?}) isn't divisible by 4, making it impossible to interpret as 32bpp RGBA pixels."</span>,
<span class="ident">byte_count</span>,
),
<span class="kw-2">&</span><span class="ident">BadIcon</span>::<span class="ident">DimensionsVsPixelCount</span> {
<span class="ident">width</span>,
<span class="ident">height</span>,
<span class="ident">width_x_height</span>,
<span class="ident">pixel_count</span>,
} <span class="op">=</span><span class="op">></span> <span class="macro">format</span><span class="macro">!</span>(
<span class="string">"The specified dimensions ({:?}x{:?}) don't match the number of pixels supplied by the `rgba` argument ({:?}). For those dimensions, the expected pixel count is {:?}."</span>,
<span class="ident">width</span>, <span class="ident">height</span>, <span class="ident">pixel_count</span>, <span class="ident">width_x_height</span>,
),
};
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">formatter</span>, <span class="string">"{}"</span>, <span class="ident">msg</span>)
}
}
<span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">BadIcon</span> {
<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="string">"A valid icon cannot be created from these arguments"</span>
}
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Error</span><span class="op">></span> {
<span class="prelude-val">Some</span>(<span class="self">self</span>)
}
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="doccomment">/// An icon used for the window titlebar, taskbar, etc.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Enabling the `icon_loading` feature provides you with several convenience methods for creating</span>
<span class="doccomment">/// an `Icon` from any format supported by the [image](https://github.com/PistonDevelopers/image)</span>
<span class="doccomment">/// crate.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Icon</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">rgba</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">width</span>: <span class="ident">u32</span>,
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">height</span>: <span class="ident">u32</span>,
}
<span class="kw">impl</span> <span class="ident">Icon</span> {
<span class="doccomment">/// Creates an `Icon` from 32bpp RGBA data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The length of `rgba` must be divisible by 4, and `width * height` must equal</span>
<span class="doccomment">/// `rgba.len() / 4`. Otherwise, this will return a `BadIcon` error.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_rgba</span>(<span class="ident">rgba</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">u32</span>, <span class="ident">height</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">BadIcon</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">rgba</span>.<span class="ident">len</span>() <span class="op">%</span> <span class="ident">PIXEL_SIZE</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">BadIcon</span>::<span class="ident">ByteCountNotDivisibleBy4</span> { <span class="ident">byte_count</span>: <span class="ident">rgba</span>.<span class="ident">len</span>() });
}
<span class="kw">let</span> <span class="ident">pixel_count</span> <span class="op">=</span> <span class="ident">rgba</span>.<span class="ident">len</span>() <span class="op">/</span> <span class="ident">PIXEL_SIZE</span>;
<span class="kw">if</span> <span class="ident">pixel_count</span> <span class="op">!</span><span class="op">=</span> (<span class="ident">width</span> <span class="op">*</span> <span class="ident">height</span>) <span class="kw">as</span> <span class="ident">usize</span> {
<span class="prelude-val">Err</span>(<span class="ident">BadIcon</span>::<span class="ident">DimensionsVsPixelCount</span> {
<span class="ident">width</span>,
<span class="ident">height</span>,
<span class="ident">width_x_height</span>: (<span class="ident">width</span> <span class="op">*</span> <span class="ident">height</span>) <span class="kw">as</span> <span class="ident">usize</span>,
<span class="ident">pixel_count</span>,
})
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(<span class="ident">Icon</span> { <span class="ident">rgba</span>, <span class="ident">width</span>, <span class="ident">height</span> })
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"icon_loading"</span>)]</span>
<span class="doccomment">/// Loads an `Icon` from the path of an image on the filesystem.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Requires the `icon_loading` feature.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_path</span><span class="op"><</span><span class="ident">P</span>: <span class="ident">AsRef</span><span class="op"><</span><span class="ident">Path</span><span class="op">></span><span class="op">></span>(<span class="ident">path</span>: <span class="ident">P</span>) <span class="op">-</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageResult</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="ident">image</span>::<span class="ident">open</span>(<span class="ident">path</span>).<span class="ident">map</span>(<span class="ident">Into</span>::<span class="ident">into</span>)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"icon_loading"</span>)]</span>
<span class="doccomment">/// Loads an `Icon` from anything implementing `BufRead` and `Seek`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Requires the `icon_loading` feature.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_reader</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span> <span class="op">+</span> <span class="ident">Seek</span><span class="op">></span>(
<span class="ident">reader</span>: <span class="ident">R</span>,
<span class="ident">format</span>: <span class="ident">image</span>::<span class="ident">ImageFormat</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageResult</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="ident">image</span>::<span class="ident">load</span>(<span class="ident">reader</span>, <span class="ident">format</span>).<span class="ident">map</span>(<span class="ident">Into</span>::<span class="ident">into</span>)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"icon_loading"</span>)]</span>
<span class="doccomment">/// Loads an `Icon` from the unprocessed bytes of an image file.</span>
<span class="doccomment">/// Uses heuristics to determine format.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Requires the `icon_loading` feature.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_bytes</span>(<span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageResult</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="ident">image</span>::<span class="ident">load_from_memory</span>(<span class="ident">bytes</span>).<span class="ident">map</span>(<span class="ident">Into</span>::<span class="ident">into</span>)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"icon_loading"</span>)]</span>
<span class="doccomment">/// Loads an `Icon` from the unprocessed bytes of an image.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Requires the `icon_loading` feature.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_bytes_with_format</span>(
<span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>],
<span class="ident">format</span>: <span class="ident">image</span>::<span class="ident">ImageFormat</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">image</span>::<span class="ident">ImageResult</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="ident">image</span>::<span class="ident">load_from_memory_with_format</span>(<span class="ident">bytes</span>, <span class="ident">format</span>).<span class="ident">map</span>(<span class="ident">Into</span>::<span class="ident">into</span>)
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"icon_loading"</span>)]</span>
<span class="doccomment">/// Requires the `icon_loading` feature.</span>
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">image</span>::<span class="ident">DynamicImage</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Icon</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">image</span>: <span class="ident">image</span>::<span class="ident">DynamicImage</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">use</span> <span class="ident">image</span>::{<span class="ident">GenericImageView</span>, <span class="ident">Pixel</span>};
<span class="kw">let</span> (<span class="ident">width</span>, <span class="ident">height</span>) <span class="op">=</span> <span class="ident">image</span>.<span class="ident">dimensions</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rgba</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>((<span class="ident">width</span> <span class="op">*</span> <span class="ident">height</span>) <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="ident">PIXEL_SIZE</span>);
<span class="kw">for</span> (<span class="kw">_</span>, <span class="kw">_</span>, <span class="ident">pixel</span>) <span class="kw">in</span> <span class="ident">image</span>.<span class="ident">pixels</span>() {
<span class="ident">rgba</span>.<span class="ident">extend_from_slice</span>(<span class="kw-2">&</span><span class="ident">pixel</span>.<span class="ident">to_rgba</span>().<span class="ident">data</span>);
}
<span class="ident">Icon</span> { <span class="ident">rgba</span>, <span class="ident">width</span>, <span class="ident">height</span> }
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"icon_loading"</span>)]</span>
<span class="doccomment">/// Requires the `icon_loading` feature.</span>
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">image</span>::<span class="ident">RgbaImage</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Icon</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">buf</span>: <span class="ident">image</span>::<span class="ident">RgbaImage</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">let</span> (<span class="ident">width</span>, <span class="ident">height</span>) <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">dimensions</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rgba</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>((<span class="ident">width</span> <span class="op">*</span> <span class="ident">height</span>) <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="ident">PIXEL_SIZE</span>);
<span class="kw">for</span> (<span class="kw">_</span>, <span class="kw">_</span>, <span class="ident">pixel</span>) <span class="kw">in</span> <span class="ident">buf</span>.<span class="ident">enumerate_pixels</span>() {
<span class="ident">rgba</span>.<span class="ident">extend_from_slice</span>(<span class="kw-2">&</span><span class="ident">pixel</span>.<span class="ident">data</span>);
}
<span class="ident">Icon</span> { <span class="ident">rgba</span>, <span class="ident">width</span>, <span class="ident">height</span> }
}
}
</pre></div>
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