<!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 of the Rust file `widgetry/src/assets.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>assets.rs - 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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg"> <link rel="alternate icon" 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id="180">180</span> </pre><div class="example-wrap"><pre class="rust "> <span class="kw">use</span> <span class="ident">std::cell::RefCell</span>; <span class="kw">use</span> <span class="ident">std::collections</span>::{<span class="ident">HashMap</span>, <span class="ident">HashSet</span>}; <span class="kw">use</span> <span class="ident">lru::LruCache</span>; <span class="kw">use</span> <span class="ident">usvg::fontdb</span>; <span class="kw">use</span> <span class="ident">usvg::Options</span>; <span class="kw">use</span> <span class="ident">geom::Bounds</span>; <span class="kw">use</span> <span class="kw">crate</span><span class="ident">::text::Font</span>; <span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">text</span>, <span class="ident">EventCtx</span>, <span class="ident">GeomBatch</span>, <span class="ident">GfxCtx</span>, <span class="ident">Prerender</span>, <span class="ident">Style</span>}; <span class="comment">// TODO We don't need refcell maybe? Can we take &mut Assets?</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Assets</span> { <span class="kw">pub</span> <span class="ident">default_line_height</span>: <span class="ident">RefCell</span><span class="op"><</span><span class="ident">f64</span><span class="op">></span>, <span class="ident">text_cache</span>: <span class="ident">RefCell</span><span class="op"><</span><span class="ident">LruCache</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">GeomBatch</span><span class="op">></span><span class="op">></span>, <span class="ident">line_height_cache</span>: <span class="ident">RefCell</span><span class="op"><</span><span class="ident">HashMap</span><span class="op"><</span>(<span class="ident">Font</span>, <span class="ident">usize</span>), <span class="ident">f64</span><span class="op">></span><span class="op">></span>, <span class="comment">// Keyed by filename</span> <span class="ident">svg_cache</span>: <span class="ident">RefCell</span><span class="op"><</span><span class="ident">HashMap</span><span class="op"><</span><span class="ident">String</span>, (<span class="ident">GeomBatch</span>, <span class="ident">Bounds</span>)<span class="op">></span><span class="op">></span>, <span class="ident">font_to_id</span>: <span class="ident">HashMap</span><span class="op"><</span><span class="ident">Font</span>, <span class="ident">fontdb::ID</span><span class="op">></span>, <span class="ident">extra_fonts</span>: <span class="ident">RefCell</span><span class="op"><</span><span class="ident">HashSet</span><span class="op"><</span><span class="ident">String</span><span class="op">></span><span class="op">></span>, <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">style</span>: <span class="ident">RefCell</span><span class="op"><</span><span class="ident">Style</span><span class="op">></span>, <span class="kw">pub</span> <span class="ident">text_opts</span>: <span class="ident">RefCell</span><span class="op"><</span><span class="ident">Options</span><span class="op">></span>, <span class="kw">pub</span> <span class="ident">read_svg</span>: <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">str</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="op">></span>, <span class="ident">base_url</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">are_gzipped</span>: <span class="ident">bool</span>, } <span class="kw">impl</span> <span class="ident">Assets</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>( <span class="ident">style</span>: <span class="ident">Style</span>, <span class="ident">base_url</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">are_gzipped</span>: <span class="ident">bool</span>, <span class="ident">read_svg</span>: <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">str</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="op">></span>, ) <span class="op">-</span><span class="op">></span> <span class="ident">Assets</span> { <span class="comment">// Many fonts are statically bundled with the library right now, on both native and web.</span> <span class="comment">// ctx.is_font_loaded and ctx.load_font can be used to dynamically add more later.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fontdb</span> <span class="op">=</span> <span class="ident">fontdb::Database::new</span>(); <span class="ident">fontdb</span>.<span class="ident">load_font_data</span>(<span class="macro">include_bytes!</span>(<span class="string">"../fonts/BungeeInline-Regular.ttf"</span>).<span class="ident">to_vec</span>()); <span class="ident">fontdb</span>.<span class="ident">load_font_data</span>(<span class="macro">include_bytes!</span>(<span class="string">"../fonts/Bungee-Regular.ttf"</span>).<span class="ident">to_vec</span>()); <span class="ident">fontdb</span>.<span class="ident">load_font_data</span>(<span class="macro">include_bytes!</span>(<span class="string">"../fonts/Overpass-Bold.ttf"</span>).<span class="ident">to_vec</span>()); <span class="ident">fontdb</span>.<span class="ident">load_font_data</span>(<span class="macro">include_bytes!</span>(<span class="string">"../fonts/OverpassMono-Bold.ttf"</span>).<span class="ident">to_vec</span>()); <span class="ident">fontdb</span>.<span class="ident">load_font_data</span>(<span class="macro">include_bytes!</span>(<span class="string">"../fonts/Overpass-Regular.ttf"</span>).<span class="ident">to_vec</span>()); <span class="ident">fontdb</span>.<span class="ident">load_font_data</span>(<span class="macro">include_bytes!</span>(<span class="string">"../fonts/Overpass-SemiBold.ttf"</span>).<span class="ident">to_vec</span>()); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">Assets</span> { <span class="ident">default_line_height</span>: <span class="ident">RefCell::new</span>(<span class="number">0.0</span>), <span class="ident">text_cache</span>: <span class="ident">RefCell::new</span>(<span class="ident">LruCache::new</span>(<span class="number">500</span>)), <span class="ident">line_height_cache</span>: <span class="ident">RefCell::new</span>(<span class="ident">HashMap::new</span>()), <span class="ident">svg_cache</span>: <span class="ident">RefCell::new</span>(<span class="ident">HashMap::new</span>()), <span class="ident">font_to_id</span>: <span class="ident">HashMap::new</span>(), <span class="ident">extra_fonts</span>: <span class="ident">RefCell::new</span>(<span class="ident">HashSet::new</span>()), <span class="ident">text_opts</span>: <span class="ident">RefCell::new</span>(<span class="ident">Options::default</span>()), <span class="ident">style</span>: <span class="ident">RefCell::new</span>(<span class="ident">style</span>), <span class="ident">base_url</span>, <span class="ident">are_gzipped</span>, <span class="ident">read_svg</span>, }; <span class="ident">a</span>.<span class="ident">text_opts</span>.<span class="ident">borrow_mut</span>().<span class="ident">fontdb</span> <span class="op">=</span> <span class="ident">fontdb</span>; <span class="kw">for</span> <span class="ident">font</span> <span class="kw">in</span> [ <span class="ident">Font::BungeeInlineRegular</span>, <span class="ident">Font::BungeeRegular</span>, <span class="ident">Font::OverpassBold</span>, <span class="ident">Font::OverpassRegular</span>, <span class="ident">Font::OverpassSemiBold</span>, <span class="ident">Font::OverpassMonoBold</span>, ] { <span class="ident">a</span>.<span class="ident">font_to_id</span>.<span class="ident">insert</span>( <span class="ident">font</span>, <span class="ident">a</span>.<span class="ident">text_opts</span> .<span class="ident">borrow</span>() .<span class="ident">fontdb</span> .<span class="ident">query</span>(<span class="kw-2">&</span><span class="ident">fontdb::Query</span> { <span class="ident">families</span>: <span class="kw-2">&</span>[<span class="ident">fontdb::Family::Name</span>(<span class="ident">font</span>.<span class="ident">family</span>())], <span class="ident">weight</span>: <span class="kw">match</span> <span class="ident">font</span> { <span class="ident">Font::OverpassBold</span> <span class="op">|</span> <span class="ident">Font::OverpassMonoBold</span> <span class="op">=</span><span class="op">></span> <span class="ident">fontdb::Weight::BOLD</span>, <span class="ident">Font::OverpassSemiBold</span> <span class="op">=</span><span class="op">></span> <span class="ident">fontdb::Weight::SEMIBOLD</span>, <span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="ident">fontdb::Weight::NORMAL</span>, }, <span class="ident">stretch</span>: <span class="ident">fontdb::Stretch::Normal</span>, <span class="ident">style</span>: <span class="ident">fontdb::Style::Normal</span>, }) .<span class="ident">unwrap</span>(), ); } <span class="kw-2">*</span><span class="ident">a</span>.<span class="ident">default_line_height</span>.<span class="ident">borrow_mut</span>() <span class="op">=</span> <span class="ident">a</span>.<span class="ident">line_height</span>(<span class="ident">text::DEFAULT_FONT</span>, <span class="ident">text::DEFAULT_FONT_SIZE</span>); <span class="ident">a</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">base_url</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">str</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">base_url</span>.<span class="ident">as_deref</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">are_gzipped</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">are_gzipped</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_font_loaded</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">filename</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">extra_fonts</span>.<span class="ident">borrow</span>().<span class="ident">contains</span>(<span class="ident">filename</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load_font</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">filename</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">bytes</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) { <span class="macro">info!</span>(<span class="string">"Loaded extra font {}"</span>, <span class="ident">filename</span>); <span class="self">self</span>.<span class="ident">extra_fonts</span>.<span class="ident">borrow_mut</span>().<span class="ident">insert</span>(<span class="ident">filename</span>.<span class="ident">to_string</span>()); <span class="self">self</span>.<span class="ident">text_opts</span>.<span class="ident">borrow_mut</span>().<span class="ident">fontdb</span>.<span class="ident">load_font_data</span>(<span class="ident">bytes</span>); <span class="comment">// We don't need to fill out font_to_id, because we can't directly create text using this</span> <span class="comment">// font.</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">line_height</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">font</span>: <span class="ident">Font</span>, <span class="ident">font_size</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">f64</span> { <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> (<span class="ident">font</span>, <span class="ident">font_size</span>); <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">height</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">line_height_cache</span>.<span class="ident">borrow</span>().<span class="ident">get</span>(<span class="kw-2">&</span><span class="ident">key</span>) { <span class="kw">return</span> <span class="kw-2">*</span><span class="ident">height</span>; } <span class="comment">// This seems to be missing line_gap, and line_gap is 0, so manually adjust here.</span> <span class="kw">let</span> <span class="ident">line_height</span> <span class="op">=</span> <span class="self">self</span> .<span class="ident">text_opts</span> .<span class="ident">borrow</span>() .<span class="ident">fontdb</span> .<span class="ident">with_face_data</span>(<span class="self">self</span>.<span class="ident">font_to_id</span>[<span class="kw-2">&</span><span class="ident">font</span>], <span class="op">|</span><span class="ident">data</span>, <span class="ident">face_index</span><span class="op">|</span> { <span class="kw">let</span> <span class="ident">font</span> <span class="op">=</span> <span class="ident">ttf_parser::Face::from_slice</span>(<span class="ident">data</span>, <span class="ident">face_index</span>).<span class="ident">unwrap</span>(); <span class="kw">let</span> <span class="ident">units_per_em</span> <span class="op">=</span> <span class="ident">font</span>.<span class="ident">units_per_em</span>().<span class="ident">unwrap</span>(); <span class="kw">let</span> <span class="ident">ascent</span> <span class="op">=</span> <span class="ident">font</span>.<span class="ident">ascender</span>(); <span class="kw">let</span> <span class="ident">descent</span> <span class="op">=</span> <span class="ident">font</span>.<span class="ident">descender</span>(); <span class="kw">let</span> <span class="ident">scale</span> <span class="op">=</span> (<span class="ident">font_size</span> <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">/</span> (<span class="ident">units_per_em</span> <span class="kw">as</span> <span class="ident">f64</span>); ((<span class="ident">ascent</span> <span class="op">-</span> <span class="ident">descent</span>) <span class="kw">as</span> <span class="ident">f64</span>) <span class="op">*</span> <span class="ident">scale</span> }) .<span class="ident">unwrap</span>(); <span class="kw">let</span> <span class="ident">height</span> <span class="op">=</span> <span class="ident">text::SCALE_LINE_HEIGHT</span> <span class="op">*</span> <span class="ident">line_height</span>; <span class="self">self</span>.<span class="ident">line_height_cache</span>.<span class="ident">borrow_mut</span>().<span class="ident">insert</span>(<span class="ident">key</span>, <span class="ident">height</span>); <span class="ident">height</span> } <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::ptr_arg</span>)]</span> <span class="comment">// &[str] does not work with `LruCache`</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_cached_text</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">String</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">GeomBatch</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">text_cache</span>.<span class="ident">borrow_mut</span>().<span class="ident">get</span>(<span class="ident">key</span>).<span class="ident">cloned</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cache_text</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">key</span>: <span class="ident">String</span>, <span class="ident">geom</span>: <span class="ident">GeomBatch</span>) { <span class="self">self</span>.<span class="ident">text_cache</span>.<span class="ident">borrow_mut</span>().<span class="ident">put</span>(<span class="ident">key</span>, <span class="ident">geom</span>); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear_text_cache</span>(<span class="kw-2">&</span><span class="self">self</span>) { <span class="self">self</span>.<span class="ident">text_cache</span>.<span class="ident">borrow_mut</span>().<span class="ident">clear</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_cached_svg</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">GeomBatch</span>, <span class="ident">Bounds</span>)<span class="op">></span> { <span class="self">self</span>.<span class="ident">svg_cache</span>.<span class="ident">borrow</span>().<span class="ident">get</span>(<span class="ident">key</span>).<span class="ident">cloned</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cache_svg</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">key</span>: <span class="ident">String</span>, <span class="ident">geom</span>: <span class="ident">GeomBatch</span>, <span class="ident">bounds</span>: <span class="ident">Bounds</span>) { <span class="self">self</span>.<span class="ident">svg_cache</span>.<span class="ident">borrow_mut</span>().<span class="ident">insert</span>(<span class="ident">key</span>, (<span class="ident">geom</span>, <span class="ident">bounds</span>)); } } <span class="kw">impl</span> <span class="ident">std::convert::AsRef</span><span class="op"><</span><span class="ident">Assets</span><span class="op">></span> <span class="kw">for</span> <span class="ident">GfxCtx</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">as_ref</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">Assets</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">prerender</span>.<span class="ident">assets</span> } } <span class="kw">impl</span> <span class="ident">std::convert::AsRef</span><span class="op"><</span><span class="ident">Assets</span><span class="op">></span> <span class="kw">for</span> <span class="ident">EventCtx</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">as_ref</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">Assets</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">prerender</span>.<span class="ident">assets</span> } } <span class="kw">impl</span> <span class="ident">std::convert::AsRef</span><span class="op"><</span><span class="ident">Assets</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Prerender</span> { <span class="kw">fn</span> <span class="ident">as_ref</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">Assets</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">assets</span> } } <span class="kw">impl</span> <span class="ident">std::convert::AsRef</span><span class="op"><</span><span class="ident">Assets</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Assets</span> { <span class="kw">fn</span> <span class="ident">as_ref</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">Assets</span> { <span class="self">self</span> } } </pre></div> </section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="widgetry" data-search-index-js="../../search-index.js" data-search-js="../../search.js"></div> <script src="../../main.js"></script><script src="../../source-script.js"></script><script src="../../source-files.js"></script></body></html>