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Greg Pomerantz 9c0525e93f Jank fix: thread priorities — raise vsync waker, demote decoders 
Slint's android-activity backend wakes the main loop from a dedicated
"slint vsync" Choreographer thread while any animation is active
(i-slint-backend-android-activity/vsync.rs). Android schedules that
thread at nice +10 (lowest on device), while our 4 turbojpeg workers
inherited the UI thread's nice -10. Under CPU bursts the +10 waker
starves and the main loop's next wakeup lands 3-4 frames late: 25-33 ms
of pure wake latency at 120 Hz, with zero cost in our tick (d=7-34 us) —
exactly the phone stall signature (measured: 28-39 ms gaps, catch-up
events).

- prio module: setpriority FFI (self + by-tid), raise_slint_vsync()
- thumb workers + dispatcher: nice +2 at spawn (ahead of background
  apps, behind the UI's -10)
- android_main: prio-fix thread raises "slint vsync" to nice 0 with a
  readback log
- verified on emulator: thumb-* hold nice 2, slint vsync holds 0 while
  foreground (Android re-nices backgrounded processes — expected)
- emulator scroll cadence unchanged (llvmpipe rasterization ceiling,
  not a priority issue) — phone is the acceptance target, A/B test
  planned for when it is back online

Also: drop unused android_logger dependency (nblog replaced it).
2026-10-28 00:53:30 -04:00
scripts M2: thumbnail engine — turbojpeg DCT-shrink decode, worker pool, disk cache 2026-10-27 16:32:12 -04:00
src Jank fix: thread priorities — raise vsync waker, demote decoders 2026-10-28 00:53:30 -04:00
.gitignore M0: Slint gallery scaffold + development hand-off 2026-10-27 12:22:59 -04:00
build.rs M0: Slint gallery scaffold + development hand-off 2026-10-27 12:22:59 -04:00
Cargo.lock Jank fix: thread priorities — raise vsync waker, demote decoders 2026-10-28 00:53:30 -04:00
Cargo.toml Jank fix: thread priorities — raise vsync waker, demote decoders 2026-10-28 00:53:30 -04:00
HANDOFF.md Jank fix: thread priorities — raise vsync waker, demote decoders 2026-10-28 00:53:30 -04:00
LICENSE Initial commit 2026-10-27 12:13:22 -04:00
README.md M1: metadata scan + sqlite DB + placeholder list 2026-10-27 13:28:33 -04:00

README.md

gallery

A high-performance image gallery for Android (primary), Linux and macOS — Rust + Slint 1.18.

Status: M1 (metadata scan + DB) done. See HANDOFF.md — the development hand-off with the full plan: architecture, thumbnail pipeline, milestones M1–M7, Slint gotchas, permission flow, and performance targets. Next: M2 (thumbnail engine).

Build

./scripts/build.sh debug     # debug x86_64 APK + install on emulator
./scripts/build.sh           # release x86_64 (emulator)
./scripts/build.sh aarch64   # release aarch64 (device)
cargo run                    # desktop (Linux needs libfontconfig1 + pkg-config)

Requires: Rust (rustup), cargo-apk2, Android SDK + NDK 27 (see HANDOFF.md §3 for exact paths/env).

License

GPL-3.0 (see LICENSE). Built on Slint, used under the Slint royalty-free license for proprietary apps (see HANDOFF.md §10.4).