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</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&#39;t need refcell maybe? Can we take &amp;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">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>,
    <span class="ident">text_cache</span>: <span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">LruCache</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">GeomBatch</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="ident">line_height_cache</span>: <span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">HashMap</span><span class="op">&lt;</span>(<span class="ident">Font</span>, <span class="ident">usize</span>), <span class="ident">f64</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="comment">// Keyed by filename</span>
    <span class="ident">svg_cache</span>: <span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">String</span>, (<span class="ident">GeomBatch</span>, <span class="ident">Bounds</span>)<span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="ident">font_to_id</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">Font</span>, <span class="ident">fontdb::ID</span><span class="op">&gt;</span>,
    <span class="ident">extra_fonts</span>: <span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">HashSet</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">style</span>: <span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">Style</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">text_opts</span>: <span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">Options</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">read_svg</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="ident">base_url</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</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">&lt;</span><span class="ident">String</span><span class="op">&gt;</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">&lt;</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    ) <span class="op">-</span><span class="op">&gt;</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">&quot;../fonts/BungeeInline-Regular.ttf&quot;</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">&quot;../fonts/Bungee-Regular.ttf&quot;</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">&quot;../fonts/Overpass-Bold.ttf&quot;</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">&quot;../fonts/OverpassMono-Bold.ttf&quot;</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">&quot;../fonts/Overpass-Regular.ttf&quot;</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">&quot;../fonts/Overpass-SemiBold.ttf&quot;</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">&amp;</span><span class="ident">fontdb::Query</span> {
                        <span class="ident">families</span>: <span class="kw-2">&amp;</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">&gt;</span> <span class="ident">fontdb::Weight::BOLD</span>,
                            <span class="ident">Font::OverpassSemiBold</span> <span class="op">=</span><span class="op">&gt;</span> <span class="ident">fontdb::Weight::SEMIBOLD</span>,
                            <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</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">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</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">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</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">&amp;</span><span class="self">self</span>, <span class="ident">filename</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</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">&amp;</span><span class="self">self</span>, <span class="ident">filename</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">bytes</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) {
        <span class="macro">info!</span>(<span class="string">&quot;Loaded extra font {}&quot;</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&#39;t need to fill out font_to_id, because we can&#39;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">&amp;</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">&gt;</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">&amp;</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">&amp;</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">// &amp;[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">&amp;</span><span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">String</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">GeomBatch</span><span class="op">&gt;</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">&amp;</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">&amp;</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">&amp;</span><span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">GeomBatch</span>, <span class="ident">Bounds</span>)<span class="op">&gt;</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">&amp;</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">&lt;</span><span class="ident">Assets</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">GfxCtx</span><span class="op">&lt;</span><span class="lifetime">&#39;_</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Assets</span> {
        <span class="kw-2">&amp;</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">&lt;</span><span class="ident">Assets</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">EventCtx</span><span class="op">&lt;</span><span class="lifetime">&#39;_</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Assets</span> {
        <span class="kw-2">&amp;</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">&lt;</span><span class="ident">Assets</span><span class="op">&gt;</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">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Assets</span> {
        <span class="kw-2">&amp;</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">&lt;</span><span class="ident">Assets</span><span class="op">&gt;</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">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">Assets</span> {
        <span class="self">self</span>
    }
}
</pre></div>
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