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Greg Pomerantz c72bfa481d 120Hz hunt: EW wake probe + poll/render CPU-time splits; sltest baseline 
Measurements only, no behavior change:
- vsync.rs: EW lines (every early-waker landing, EW_ON flag, off by default)
- lib.rs/stg.rs: IT lines gain dec (locked/saw_wake/pr_before/do_render) and
  pcpu (CPU us inside poll_events — 2% = asleep in epoll, rules out CPU
  spin/deschedule as the wake latency)

Findings (docs/BUGS/hypotheses-120hz.md, sltest baseline):
- Choreographer callback fires at edge+0.52ms (p90 0.65) — the 'late
  Choreographer' model from earlier sessions was a mislabeled STG field
  (poll block time, not callback latency). The pipeline actually works at
  median: present at edge+~4ms, inside the 5.5ms deadline.
- sltest zero-jank definition measured: 98.8% of frames land in the next
  display slot; residual = 0.5-0.7% drops + 0.7-0.9% doubles + 1.4ms
  phase spread (p10-p90) = the visible micro-judder.
- Residual cost is VARIANCE, not median: per-frame render 3.5ms median
  (SKD 1.07 + CLR 0.8 + PRE 1.0 + SKF/ORD 0.65) with spikes to 10.7ms
  (SKD max 5.2, CLR max 3.2, PRE max 2.5). Spikes push presents past the
  deadline (drops) and shake the phase (judder).
Next: classify spikes (CPU work vs GPU/driver block) via render-window
CPU splits, then kill the top source.
2026-10-30 11:59:39 -04:00
docs/BUGS 120Hz hunt: EW wake probe + poll/render CPU-time splits; sltest baseline 2026-10-30 11:59:39 -04:00
scripts Fix 120Hz scroll jank end-to-end: render-ahead present + full-cache eviction off the UI thread 2026-10-30 02:49:23 -04:00
shim Fix 120Hz scroll jank end-to-end: render-ahead present + full-cache eviction off the UI thread 2026-10-30 02:49:23 -04:00
src Fix thumbnail pop-in: hold-queue for paint-cap overflow + append-only scan streaming + window-liveness watchdog 2026-10-30 09:04:01 -04:00
vendor 120Hz hunt: EW wake probe + poll/render CPU-time splits; sltest baseline 2026-10-30 11:59:39 -04:00
.gitignore Fix 120Hz scroll jank end-to-end: render-ahead present + full-cache eviction off the UI thread 2026-10-30 02:49:23 -04:00
build.rs M0: Slint gallery scaffold + development hand-off 2026-10-27 12:22:59 -04:00
Cargo.lock Fix 120Hz scroll jank end-to-end: render-ahead present + full-cache eviction off the UI thread 2026-10-30 02:49:23 -04:00
Cargo.toml Fix thumbnail pop-in: hold-queue for paint-cap overflow + append-only scan streaming + window-liveness watchdog 2026-10-30 09:04:01 -04:00
HANDOFF.md HANDOFF §8.10: pop-in root causes (paint-cap drop, scan storm, black window) + test hygiene 2026-10-30 09:05:08 -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).