Martin Bauer
6ccb3e458f
The React UI is sluggish on the kiosk and the reasons are browser-shaped: a compositor deciding what gets its own layer, a requestAnimationFrame loop repainting the viewport, and a JPEG decode per album card per cold start. The last three commits chased that through the service worker and the cover pipeline. This is the other direction - the same backend, the same layout, the same German copy, without a browser. Browse and play only. The typing game, the room-lights page, parent mode and the IR-remote assignment stay web-only, and nothing here touches python-backend. Four things carry the performance claim, in rough order of how much they should matter: Covers are downscaled once, ever. The backend serves one size - 640px on the long edge, no ?size= - and a grid card is 180. src/covers.rs fetches each cover once on a worker thread, resizes it, and writes a JPEG thumbnail to ~/.cache/musicmouse-slint/covers/. Two tiers and only two, which is what makes the cache worth keeping: a per-widget pixel size would give each album a dozen near-identical files and a fresh decode for each. The cache is dropped when the websocket announces a rescan, because that is the one moment the backend rewrites the art behind an unchanged cover URL - the trap sw.js had to learn about the hard way. The grid is virtualized. Rust hands the UI the album list pre-chunked into rows and the view puts those in a ListView, which instantiates only what is on screen. A flat list of 660 cards gives it no rows to skip, hence the chunking. Same purpose as content-visibility: auto on .grid > .card. The progress bar animates between the 2 Hz pushes rather than running a clock, so interpolation costs a property evaluation per frame on the render side and there is no equivalent of usePlaybackClock. It is suppressed for the frame a track changes on, so a new track jumps instead of sliding across two unrelated positions. Nothing on screen animates by itself. The ambient canvas is not ported, for the reason lib/lowPower.ts already gives: a loop repainting the viewport is a floor you cannot get under while it runs at all. The device must not use FemtoVG. On Mesa V3D it draws every runtime-loaded Image as solid black (slint-ui/slint#11785, open), which here means every album cover; Skia and the software renderer are unaffected. So `kiosk` is linuxkms + Skia and FemtoVG stays the default only for desktop development. Both profiles are verified to build; the kiosk binary links libinput/libgbm/libdrm and no X11 or Wayland at all. lib/search.ts, lib/keyboard.ts and lib/format.ts were already pure functions with their own tests, so they port across as pure Rust with theirs: 43 tests, no window required. The .slint files are layout only - nothing in them formats a number or picks a word. Verified against the real 660-album library rather than a fixture. tools/headless-shots.sh renders the UI inside a nested headless compositor and grabs a frame per screen, which is how that was checked on a machine whose session was locked; a Slint window needs a real compositor, and under bare Xvfb nothing maps at all. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
92 lines
2.7 KiB
Plaintext
92 lines
2.7 KiB
Plaintext
// The shapes that cross between Rust and the UI.
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//
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// Everything here is already *presentation*: labels are formatted, durations are
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// strings, covers are decoded images. Nothing in the .slint files formats a number or
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// picks a word, so the German copy and the duration format live in one place (Rust)
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// rather than being split across two languages.
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//
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// `nav` is each item's position in the single flat selection order that runs songs ->
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// categories -> albums, so one pair of arrow keys walks the whole page. It is assigned
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// in Rust, where the three lists are built together.
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export struct AlbumTile {
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id: string,
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title: string,
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artist: string,
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// "12 Songs · 45:03 · 🧸" - already assembled, including the figurine marker.
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meta: string,
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cover: image,
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is-book: bool,
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locked: bool,
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// This album is the one playing; drawn with the accent ring rather than the
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// selection ring, and outranked by it when they coincide.
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current: bool,
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nav: int,
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}
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// The grid is handed to the UI pre-chunked into rows, because a `ListView` virtualizes
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// its model and a flat list of 343 cards has no rows to skip. This is the direct
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// counterpart of the web app's `content-visibility: auto` on `.grid > .card`, which
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// exists for exactly the same measurement: 340 live cards saturated the Pi's renderer.
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export struct GridRow {
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tiles: [AlbumTile],
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}
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export struct CategoryTile {
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key: string,
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// "7 Hörbücher"
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count-label: string,
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// Up to four covers in a 2x2, or one filling the tile when the category holds a
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// single album. Four fields rather than an array: the count is fixed and small, and
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// this keeps the tile a plain struct.
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cover1: image,
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cover2: image,
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cover3: image,
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cover4: image,
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cover-count: int,
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is-book: bool,
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nav: int,
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}
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export struct CategoryRow {
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tiles: [CategoryTile],
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}
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// One of the three shelves on the root screen.
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export struct Shelf {
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label: string,
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icon: string,
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tiles: [CategoryTile],
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empty-label: string,
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}
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export struct TrackRow {
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title: string,
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subtitle: string,
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duration: string,
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cover: image,
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is-book: bool,
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current: bool,
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locked: bool,
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album-id: string,
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index: int,
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nav: int,
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}
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// What the player bar and the full-screen view both say. Shared so the two cannot
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// drift apart on a copy change.
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export struct NowPlaying {
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title: string,
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subtitle: string,
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// "Song 3 von 8" / "Kapitel 3 von 8"
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counter: string,
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cover: image,
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hero-cover: image,
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is-book: bool,
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has-album: bool,
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// "−4:12", the time left in this track.
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clock-label: string,
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// "Noch 38:20 im Album" - empty for a podcast, where it means nothing.
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remaining-label: string,
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}
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