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>
66 lines
2.8 KiB
TOML
66 lines
2.8 KiB
TOML
[package]
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name = "musicmouse-slint"
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version = "0.1.0"
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edition = "2021"
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description = "Native Slint front-end for the MusicMouse player"
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[dependencies]
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# default-features off so the renderer is an explicit choice below, never an
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# accident: on a Pi 5 (Mesa V3D) the default FemtoVG renderer draws every runtime
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# loaded Image as solid black - see slint-ui/slint#11785 - which for this app means
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# every album cover. The `skia` feature is the device's way out.
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slint = { version = "1.15", default-features = false, features = [
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"compat-1-2",
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"std",
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] }
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serde = { version = "1", features = ["derive"] }
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serde_json = "1"
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# Blocking HTTP and blocking websockets, each on its own thread, rather than an async
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# runtime. The whole client makes one library request, one websocket connection and a
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# trickle of covers; tokio would be more machinery than the job has work.
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ureq = { version = "2.12", default-features = false, features = ["json", "gzip"] }
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tungstenite = { version = "0.24", default-features = false, features = ["handshake"] }
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image = { version = "0.25", default-features = false, features = ["jpeg", "png"] }
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dirs = "5"
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# Only for `normalize()`: folding "Grüffelo" to "gruffelo" needs a real NFD pass, which
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# is what the web client gets from String.prototype.normalize for free.
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unicode-normalization = "0.1"
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[build-dependencies]
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slint-build = "1.15"
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[features]
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default = ["desktop"]
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# Development on a normal desktop session. FemtoVG is fine on x86/Mesa and builds in
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# seconds, which is what makes it the right default *here* and the wrong one on the Pi.
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# `renderer-software` rides along so `SLINT_BACKEND=winit-software` works without a
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# rebuild: it is how the UI can be rendered and screenshotted on a machine with no GPU
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# (or no session), and it is the fallback the Pi 5 FemtoVG bug leaves standing.
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desktop = ["slint/backend-winit", "slint/renderer-femtovg", "slint/renderer-software"]
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# Same window, Skia instead - the combination the device runs, so visual checks here
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# match what ships. Costs a long first build while rust-skia bootstraps.
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skia = ["slint/backend-winit", "slint/renderer-skia"]
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# The device: straight onto KMS/DRM with no X, no Wayland and no compositor, input
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# via libinput. (`backend-linuxkms-noseat` is deprecated upstream in favour of this.)
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#
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# Build it with `--no-default-features --features kiosk`: cargo features are additive,
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# so leaving `desktop` enabled links winit and linuxkms into the same binary.
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kiosk = ["slint/backend-linuxkms-libinput", "slint/renderer-skia"]
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[profile.release]
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opt-level = 3
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lto = "thin"
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codegen-units = 1
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panic = "abort"
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# The UI is laid out and hit-tested in debug builds too; an unoptimised image resize
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# on a 343-album first run is otherwise the slowest thing in the app by far.
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[profile.dev.package.image]
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opt-level = 3
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[profile.dev.package.slint]
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opt-level = 2
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