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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">cell</span>::<span class="ident">Cell</span>;

<span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Bounds</span>, <span class="ident">Polygon</span>, <span class="ident">Pt2D</span>};

<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">assets</span>::<span class="ident">Assets</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">backend</span>::{<span class="ident">GfxCtxInnards</span>, <span class="ident">PrerenderInnards</span>};
<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">Canvas</span>, <span class="ident">Color</span>, <span class="ident">Drawable</span>, <span class="ident">EventCtx</span>, <span class="ident">GeomBatch</span>, <span class="ident">Key</span>, <span class="ident">ScreenDims</span>, <span class="ident">ScreenPt</span>, <span class="ident">ScreenRectangle</span>,
    <span class="ident">Style</span>, <span class="ident">Text</span>,
};

<span class="comment">// We organize major layers of the app with whole number z values, with lower values being more on</span>
<span class="comment">// top.</span>
<span class="comment">//</span>
<span class="comment">// Within each layer, we must only adjust the z-offset of individual polygons within (-1, 0] to</span>
<span class="comment">// avoid traversing layers.</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const</span> <span class="ident">MAPSPACE_Z</span>: <span class="ident">f32</span> <span class="op">=</span> <span class="number">1.0</span>;
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const</span> <span class="ident">SCREENSPACE_Z</span>: <span class="ident">f32</span> <span class="op">=</span> <span class="number">0.0</span>;
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const</span> <span class="ident">MENU_Z</span>: <span class="ident">f32</span> <span class="op">=</span> <span class="op">-</span><span class="number">1.0</span>;
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const</span> <span class="ident">TOOLTIP_Z</span>: <span class="ident">f32</span> <span class="op">=</span> <span class="op">-</span><span class="number">2.0</span>;

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Uniforms</span> {
    <span class="comment">// (cam_x, cam_y, cam_zoom)</span>
    <span class="kw">pub</span> <span class="ident">transform</span>: [<span class="ident">f32</span>; <span class="number">3</span>],
    <span class="comment">// (window_width, window_height, Z values)</span>
    <span class="kw">pub</span> <span class="ident">window</span>: [<span class="ident">f32</span>; <span class="number">3</span>],
}

<span class="kw">impl</span> <span class="ident">Uniforms</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">canvas</span>: <span class="kw-2">&amp;</span><span class="ident">Canvas</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Uniforms</span> {
        <span class="ident">Uniforms</span> {
            <span class="ident">transform</span>: [
                <span class="ident">canvas</span>.<span class="ident">cam_x</span> <span class="kw">as</span> <span class="ident">f32</span>,
                <span class="ident">canvas</span>.<span class="ident">cam_y</span> <span class="kw">as</span> <span class="ident">f32</span>,
                <span class="ident">canvas</span>.<span class="ident">cam_zoom</span> <span class="kw">as</span> <span class="ident">f32</span>,
            ],
            <span class="ident">window</span>: [
                <span class="ident">canvas</span>.<span class="ident">window_width</span> <span class="kw">as</span> <span class="ident">f32</span>,
                <span class="ident">canvas</span>.<span class="ident">window_height</span> <span class="kw">as</span> <span class="ident">f32</span>,
                <span class="ident">MAPSPACE_Z</span>,
            ],
        }
    }
}

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">GfxCtx</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">inner</span>: <span class="ident">GfxCtxInnards</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
    <span class="ident">uniforms</span>: <span class="ident">Uniforms</span>,

    <span class="ident">screencap_mode</span>: <span class="ident">bool</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">naming_hint</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,

    <span class="comment">// TODO Don&#39;t be pub. Delegate everything.</span>
    <span class="kw">pub</span> <span class="ident">canvas</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Canvas</span>,
    <span class="kw">pub</span> <span class="ident">prerender</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Prerender</span>,
    <span class="ident">style</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Style</span>,

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">num_draw_calls</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">num_forks</span>: <span class="ident">usize</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">GfxCtx</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new</span>(
        <span class="ident">prerender</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Prerender</span>,
        <span class="ident">canvas</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Canvas</span>,
        <span class="ident">style</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">Style</span>,
        <span class="ident">screencap_mode</span>: <span class="ident">bool</span>,
    ) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">GfxCtx</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">uniforms</span> <span class="op">=</span> <span class="ident">Uniforms</span>::<span class="ident">new</span>(<span class="ident">canvas</span>);
        <span class="ident">GfxCtx</span> {
            <span class="ident">inner</span>: <span class="ident">prerender</span>.<span class="ident">inner</span>.<span class="ident">draw_new_frame</span>(),
            <span class="ident">uniforms</span>,
            <span class="ident">canvas</span>,
            <span class="ident">style</span>,
            <span class="ident">prerender</span>,
            <span class="ident">num_draw_calls</span>: <span class="number">0</span>,
            <span class="ident">num_forks</span>: <span class="number">0</span>,
            <span class="ident">screencap_mode</span>,
            <span class="ident">naming_hint</span>: <span class="prelude-val">None</span>,
        }
    }

    <span class="comment">// Up to the caller to call unfork()!</span>
    <span class="comment">// TODO Canvas doesn&#39;t understand this change, so things like text drawing that use</span>
    <span class="comment">// map_to_screen will just be confusing.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fork</span>(
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>,
        <span class="ident">top_left_map</span>: <span class="ident">Pt2D</span>,
        <span class="ident">top_left_screen</span>: <span class="ident">ScreenPt</span>,
        <span class="ident">zoom</span>: <span class="ident">f64</span>,
        <span class="ident">z</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">f32</span><span class="op">&gt;</span>,
    ) {
        <span class="comment">// map_to_screen of top_left_map should be top_left_screen</span>
        <span class="kw">let</span> <span class="ident">cam_x</span> <span class="op">=</span> (<span class="ident">top_left_map</span>.<span class="ident">x</span>() <span class="op">*</span> <span class="ident">zoom</span>) <span class="op">-</span> <span class="ident">top_left_screen</span>.<span class="ident">x</span>;
        <span class="kw">let</span> <span class="ident">cam_y</span> <span class="op">=</span> (<span class="ident">top_left_map</span>.<span class="ident">y</span>() <span class="op">*</span> <span class="ident">zoom</span>) <span class="op">-</span> <span class="ident">top_left_screen</span>.<span class="ident">y</span>;

        <span class="self">self</span>.<span class="ident">uniforms</span>.<span class="ident">transform</span> <span class="op">=</span> [<span class="ident">cam_x</span> <span class="kw">as</span> <span class="ident">f32</span>, <span class="ident">cam_y</span> <span class="kw">as</span> <span class="ident">f32</span>, <span class="ident">zoom</span> <span class="kw">as</span> <span class="ident">f32</span>];
        <span class="self">self</span>.<span class="ident">uniforms</span>.<span class="ident">window</span> <span class="op">=</span> [
            <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_width</span> <span class="kw">as</span> <span class="ident">f32</span>,
            <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_height</span> <span class="kw">as</span> <span class="ident">f32</span>,
            <span class="ident">z</span>.<span class="ident">unwrap_or</span>(<span class="ident">SCREENSPACE_Z</span>),
        ];
        <span class="self">self</span>.<span class="ident">num_forks</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fork_screenspace</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">uniforms</span>.<span class="ident">transform</span> <span class="op">=</span> [<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">1.0</span>];
        <span class="self">self</span>.<span class="ident">uniforms</span>.<span class="ident">window</span> <span class="op">=</span> [
            <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_width</span> <span class="kw">as</span> <span class="ident">f32</span>,
            <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_height</span> <span class="kw">as</span> <span class="ident">f32</span>,
            <span class="ident">SCREENSPACE_Z</span>,
        ];
        <span class="self">self</span>.<span class="ident">num_forks</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unfork</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">uniforms</span> <span class="op">=</span> <span class="ident">Uniforms</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">canvas</span>);
        <span class="self">self</span>.<span class="ident">num_forks</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;

        <span class="comment">// println!(&quot;{:?}&quot;, backtrace::Backtrace::new());</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">color</span>: <span class="ident">Color</span>) {
        <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clear</span>(<span class="ident">color</span>);
    }

    <span class="comment">// Doesn&#39;t take &amp;Polygon, because this is inherently inefficient. If performance matters,</span>
    <span class="comment">// upload, cache, and redraw.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">draw_polygon</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">color</span>: <span class="ident">Color</span>, <span class="ident">poly</span>: <span class="ident">Polygon</span>) {
        <span class="ident">GeomBatch</span>::<span class="ident">from</span>(<span class="macro">vec</span><span class="macro">!</span>[(<span class="ident">color</span>, <span class="ident">poly</span>)]).<span class="ident">draw</span>(<span class="self">self</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">redraw</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">obj</span>: <span class="kw-2">&amp;</span><span class="ident">Drawable</span>) {
        <span class="self">self</span>.<span class="ident">inner</span>
            .<span class="ident">redraw</span>(<span class="ident">obj</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">uniforms</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">prerender</span>.<span class="ident">inner</span>);
        <span class="self">self</span>.<span class="ident">num_draw_calls</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;

        <span class="comment">// println!(&quot;{:?}&quot;, backtrace::Backtrace::new());</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">redraw_at</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>, <span class="ident">obj</span>: <span class="kw-2">&amp;</span><span class="ident">Drawable</span>) {
        <span class="self">self</span>.<span class="ident">fork</span>(<span class="ident">Pt2D</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>), <span class="ident">top_left</span>, <span class="number">1.0</span>, <span class="prelude-val">None</span>);
        <span class="self">self</span>.<span class="ident">redraw</span>(<span class="ident">obj</span>);
        <span class="self">self</span>.<span class="ident">unfork</span>();
    }

    <span class="comment">// TODO Stateful API :(</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">enable_clipping</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">rect</span>: <span class="ident">ScreenRectangle</span>) {
        <span class="kw">let</span> <span class="ident">scale_factor</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">prerender</span>.<span class="ident">get_scale_factor</span>();
        <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">enable_clipping</span>(<span class="ident">rect</span>, <span class="ident">scale_factor</span>, <span class="self">self</span>.<span class="ident">canvas</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">disable_clipping</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="kw">let</span> <span class="ident">scale_factor</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">prerender</span>.<span class="ident">get_scale_factor</span>();
        <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">disable_clipping</span>(<span class="ident">scale_factor</span>, <span class="self">self</span>.<span class="ident">canvas</span>);
    }

    <span class="comment">// Canvas stuff.</span>

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">draw_mouse_tooltip</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">txt</span>: <span class="ident">Text</span>) {
        <span class="comment">// Add some padding</span>
        <span class="kw">let</span> <span class="ident">pad</span> <span class="op">=</span> <span class="number">5.0</span>;
        <span class="kw">let</span> <span class="ident">txt</span> <span class="op">=</span> <span class="ident">txt</span>.<span class="ident">default_fg</span>(<span class="self">self</span>.<span class="ident">style</span>.<span class="ident">text_tooltip_color</span>);
        <span class="kw">let</span> <span class="ident">txt_batch</span> <span class="op">=</span> <span class="ident">txt</span>.<span class="ident">render</span>(<span class="self">self</span>);
        <span class="kw">let</span> <span class="ident">raw_dims</span> <span class="op">=</span> <span class="ident">txt_batch</span>.<span class="ident">get_dims</span>();
        <span class="kw">let</span> <span class="ident">dims</span> <span class="op">=</span> <span class="ident">ScreenDims</span>::<span class="ident">new</span>(<span class="ident">raw_dims</span>.<span class="ident">width</span> <span class="op">+</span> <span class="number">2.0</span> <span class="op">*</span> <span class="ident">pad</span>, <span class="ident">raw_dims</span>.<span class="ident">height</span> <span class="op">+</span> <span class="number">2.0</span> <span class="op">*</span> <span class="ident">pad</span>);

        <span class="comment">// TODO Maybe also consider the cursor as a valid center</span>
        <span class="kw">let</span> <span class="ident">pt</span> <span class="op">=</span> <span class="ident">dims</span>.<span class="ident">top_left_for_corner</span>(
            <span class="ident">ScreenPt</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">cursor</span>.<span class="ident">x</span>, <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">cursor</span>.<span class="ident">y</span> <span class="op">+</span> <span class="number">20.0</span>),
            <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">canvas</span>,
        );
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">batch</span> <span class="op">=</span> <span class="ident">GeomBatch</span>::<span class="ident">new</span>();
        <span class="comment">// TODO Outline?</span>
        <span class="ident">batch</span>.<span class="ident">push</span>(
            <span class="ident">Color</span>::<span class="ident">BLACK</span>,
            <span class="ident">Polygon</span>::<span class="ident">rectangle</span>(<span class="ident">dims</span>.<span class="ident">width</span>, <span class="ident">dims</span>.<span class="ident">height</span>).<span class="ident">translate</span>(<span class="ident">pt</span>.<span class="ident">x</span>, <span class="ident">pt</span>.<span class="ident">y</span>),
        );
        <span class="ident">batch</span>.<span class="ident">append</span>(<span class="ident">txt_batch</span>.<span class="ident">translate</span>(<span class="ident">pt</span>.<span class="ident">x</span> <span class="op">+</span> <span class="ident">pad</span>, <span class="ident">pt</span>.<span class="ident">y</span> <span class="op">+</span> <span class="ident">pad</span>));

        <span class="comment">// fork_screenspace, but with an even more prominent Z</span>
        <span class="self">self</span>.<span class="ident">uniforms</span>.<span class="ident">transform</span> <span class="op">=</span> [<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">1.0</span>];
        <span class="self">self</span>.<span class="ident">uniforms</span>.<span class="ident">window</span> <span class="op">=</span> [
            <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_width</span> <span class="kw">as</span> <span class="ident">f32</span>,
            <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">window_height</span> <span class="kw">as</span> <span class="ident">f32</span>,
            <span class="ident">TOOLTIP_Z</span>,
        ];
        <span class="self">self</span>.<span class="ident">num_forks</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
        <span class="comment">// Temporarily disable clipping if needed.</span>
        <span class="kw">let</span> <span class="ident">clip</span> <span class="op">=</span> <span class="self">self</span>
            .<span class="ident">inner</span>
            .<span class="ident">take_clip</span>(<span class="self">self</span>.<span class="ident">prerender</span>.<span class="ident">get_scale_factor</span>(), <span class="self">self</span>.<span class="ident">canvas</span>);
        <span class="ident">batch</span>.<span class="ident">draw</span>(<span class="self">self</span>);
        <span class="self">self</span>.<span class="ident">unfork</span>();
        <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">restore_clip</span>(<span class="ident">clip</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_screen_bounds</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Bounds</span> {
        <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">get_screen_bounds</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">screen_to_map</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pt</span>: <span class="ident">ScreenPt</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Pt2D</span> {
        <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">screen_to_map</span>(<span class="ident">pt</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_cursor_in_map_space</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="ident">Pt2D</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">get_cursor_in_map_space</span>()
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_num_uploads</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">prerender</span>.<span class="ident">num_uploads</span>.<span class="ident">get</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_screencap</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">screencap_mode</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_screencap_naming_hint</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">hint</span>: <span class="ident">String</span>) {
        <span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">screencap_mode</span>);
        <span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">naming_hint</span>.<span class="ident">is_none</span>());
        <span class="self">self</span>.<span class="ident">naming_hint</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">hint</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">upload</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">batch</span>: <span class="ident">GeomBatch</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Drawable</span> {
        <span class="self">self</span>.<span class="ident">prerender</span>.<span class="ident">upload</span>(<span class="ident">batch</span>)
    }

    <span class="comment">// Delegation to assets</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">default_line_height</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">f64</span> {
        <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">prerender</span>.<span class="ident">assets</span>.<span class="ident">default_line_height</span>.<span class="ident">borrow</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">style</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">Style</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">style</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_key_down</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">key</span>: <span class="ident">Key</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">canvas</span>.<span class="ident">keys_held</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">key</span>)
    }
}

<span class="comment">// TODO Don&#39;t expose this directly</span>
<span class="comment">// TODO Rename or something maybe. This actually owns all the permanent state of everything.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Prerender</span> {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">inner</span>: <span class="ident">PrerenderInnards</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">assets</span>: <span class="ident">Assets</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">num_uploads</span>: <span class="ident">Cell</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="ident">scale_factor</span>: <span class="ident">f64</span>,
}

<span class="kw">impl</span> <span class="ident">Prerender</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">upload</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">batch</span>: <span class="ident">GeomBatch</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Drawable</span> {
        <span class="self">self</span>.<span class="ident">actually_upload</span>(<span class="bool-val">true</span>, <span class="ident">batch</span>)
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">upload_temporary</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">batch</span>: <span class="ident">GeomBatch</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Drawable</span> {
        <span class="self">self</span>.<span class="ident">actually_upload</span>(<span class="bool-val">false</span>, <span class="ident">batch</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_total_bytes_uploaded</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">total_bytes_uploaded</span>.<span class="ident">get</span>()
    }

    <span class="kw">fn</span> <span class="ident">actually_upload</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">permanent</span>: <span class="ident">bool</span>, <span class="ident">batch</span>: <span class="ident">GeomBatch</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Drawable</span> {
        <span class="self">self</span>.<span class="ident">num_uploads</span>.<span class="ident">set</span>(<span class="self">self</span>.<span class="ident">num_uploads</span>.<span class="ident">get</span>() <span class="op">+</span> <span class="number">1</span>);
        <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">actually_upload</span>(<span class="ident">permanent</span>, <span class="ident">batch</span>)

        <span class="comment">// println!(&quot;{:?}&quot;, backtrace::Backtrace::new());</span>
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">request_redraw</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">request_redraw</span>()
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">get_scale_factor</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">f64</span> {
        <span class="self">self</span>.<span class="ident">scale_factor</span>
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">window_size</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">ScreenDims</span> {
        <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">window_size</span>(<span class="self">self</span>.<span class="ident">get_scale_factor</span>())
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">window_resized</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">new_size</span>: <span class="ident">ScreenDims</span>) {
        <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">window_resized</span>(<span class="ident">new_size</span>, <span class="self">self</span>.<span class="ident">get_scale_factor</span>())
    }
}

<span class="kw">impl</span> <span class="ident">std</span>::<span class="ident">convert</span>::<span class="ident">AsRef</span><span class="op">&lt;</span><span class="ident">Prerender</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">Prerender</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">prerender</span>
    }
}

<span class="kw">impl</span> <span class="ident">std</span>::<span class="ident">convert</span>::<span class="ident">AsRef</span><span class="op">&lt;</span><span class="ident">Prerender</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">Prerender</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">prerender</span>
    }
}

<span class="kw">impl</span> <span class="ident">std</span>::<span class="ident">convert</span>::<span class="ident">AsRef</span><span class="op">&lt;</span><span class="ident">Prerender</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">Prerender</span> {
        <span class="self">self</span>
    }
}
</pre></div>
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