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+<!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="The native video surface mpv renders into (UR-080 / DR-231)."><title>jellytau_lib::player::video_surface - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-17e0aaed.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="jellytau_lib" data-themes="" data-resource-suffix="" data-rustdoc-version="1.97.1 (8bab26f4f 2026-07-14)" data-channel="1.97.1" data-search-js="search-fd9372ac.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../static.files/storage-41dd4d93.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../static.files/main-fcd733ba.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-044be391.svg"></head><body class="rustdoc mod"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Module video_surface</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../jellytau_lib/index.html">jellytau_<wbr>lib</a><span class="version">0.11.2</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module video_<wbr>surface</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#why-there-is-no-overlay-here" title="Why there is no overlay here">Why there is no overlay here</a></li></ul><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#constants" title="Constants">Constants</a></li><li><a href="#functions" title="Functions">Functions</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In jellytau_<wbr>lib::<wbr>player</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../index.html">jellytau_lib</a>::<wbr><a href="../index.html">player</a></div><h1>Module <span>video_<wbr>surface</span>&nbsp;<button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/jellytau_lib/player/video_surface.rs.html#1-412">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>The native video surface mpv renders into (UR-080 / DR-231).</p>
+<p>Linux-gated because the <em>surface</em> is GTK. Everything around it — the render
+context, its lifetime, frame pacing, the device profile — is not.
+The native video surface: mpv drawn <em>behind</em> Tauri’s webview, without
+touching the widget tree.</p>
+<h2 id="why-there-is-no-overlay-here"><a class="doc-anchor" href="#why-there-is-no-overlay-here">§</a>Why there is no overlay here</h2>
+<p>The obvious arrangement — wrap the webview in a <code>GtkOverlay</code> with a
+<code>GtkGLArea</code> beneath — attaches cleanly and then aborts the process on the
+first click. <code>tauri-runtime-wry</code> connects a button-press handler to the
+webview that walks a hard-coded path:</p>
+<div class="example-wrap"><pre class="language-text"><code>webview.parent()          // &quot;This one should be GtkBox&quot;
+       .parent()          // ...and this one the GtkWindow
+       .downcast::&lt;gtk::Window&gt;().unwrap()</code></pre></div>
+<p>An overlay makes that chain <code>webview → GtkOverlay → GtkBox</code>, the downcast
+fails, and because the panic is non-unwinding it takes the app with it.
+Nothing in configuration avoids it: on Linux the handler is attached
+<em>unconditionally</em> (the Windows path guards it behind <code>is_decorated()</code>), and
+the decoration check that would make it inert runs <em>after</em> the unwrap.</p>
+<p>So the widget tree is left exactly as Tauri built it. GTK draws a container
+before its children, so rendering into the vbox’s own <code>draw</code> handler puts the
+picture underneath the webview for free — the same z-order, no reparenting,
+one less widget, and nothing a Tauri upgrade can invalidate by assuming its
+own layout.</p>
+<p>TRACES: UR-080 | DR-231, DR-232, DR-233, IR-033</p>
+</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><dl class="item-table"><dt><a class="struct" href="struct.SurfaceState.html" title="struct jellytau_lib::player::video_surface::SurfaceState">Surface<wbr>State</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>Everything the draw handler needs, shared with the GTK callbacks.</dd><dt><a class="struct" href="struct.VideoSurface.html" title="struct jellytau_lib::player::video_surface::VideoSurface">Video<wbr>Surface</a></dt><dd>A live video surface. Dropping it tears the render context down.</dd></dl><h2 id="constants" class="section-header">Constants<a href="#constants" class="anchor">§</a></h2><dl class="item-table"><dt><a class="constant" href="constant.GL_TEXTURE.html" title="constant jellytau_lib::player::video_surface::GL_TEXTURE">GL_<wbr>TEXTURE</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>GL enum for <code>gdk_cairo_draw_from_gl</code>’s <code>source_type</code>. GDK takes the GL
+constant itself rather than an enum of its own.</dd><dt><a class="constant" href="constant.LIVE_SURFACE.html" title="constant jellytau_lib::player::video_surface::LIVE_SURFACE">LIVE_<wbr>SURFACE</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>The one live surface, on the GTK main thread.</dd></dl><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><dl class="item-table"><dt><a class="fn" href="fn.attach.html" title="fn jellytau_lib::player::video_surface::attach">attach</a></dt><dd>Start drawing mpv’s video underneath the webview.</dd><dt><a class="fn" href="fn.detach.html" title="fn jellytau_lib::player::video_surface::detach">detach</a></dt><dd>Drop the live surface, if there is one. Idempotent.</dd><dt><a class="fn" href="fn.draw.html" title="fn jellytau_lib::player::video_surface::draw">draw</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>Draw the current frame, if there is one.</dd><dt><a class="fn" href="fn.init_gl.html" title="fn jellytau_lib::player::video_surface::init_gl">init_gl</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>Create the GL context and the mpv render context over it.</dd><dt><a class="fn" href="fn.on_mpv_update.html" title="fn jellytau_lib::player::video_surface::on_mpv_update">on_<wbr>mpv_<wbr>update</a><span title="Restricted Visibility">&nbsp;🔒</span> <sup title="unsafe function">⚠</sup></dt><dd>mpv’s update callback. Runs on an mpv thread, so it does the least possible:
+flags the state and asks GTK to redraw on the main loop.</dd></dl></section></div></main></body></html>