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Greg Pomerantz 8f06b85376 120Hz: re-enable render-ahead under the corrected timing model 
The 'callback arrives 3-6 ms late' model that invalidated render-ahead in
earlier sessions was a mislabeled STG field: the Choreographer callback
actually fires at edge+0.5 ms (measured from the VSYNC ftn/mon pair). With
the wake ON the edge, the held frame presented at render START lands at
edge+~1.5 ms (constant phase, 4 ms of deadline margin), and render spikes
(5-10 ms, the measured cause of the residual 1% drops + 1.5 ms phase
spread) only stretch the PREPARE phase of the frame held for the NEXT
slot — spikes stop delaying visible frames.

- lib.rs: RENDER_AHEAD_ACTIVE = locked again (was false)
- lib.rs/stg.rs: IT lines gain rcpu (CPU us inside do_render) — spike
  classifier: rcpu≈render ⇒ Skia/driver CPU work; rcpu≪render ⇒ blocked
  on GPU/driver
- hypotheses-120hz.md: model correction + sltest baseline + results

Emulator behavior verified: scroll, settle (transition flush), mid-drag
pause/resume (no black window), no AlreadyAcquired panics, held-frame
presents at 0.6-2.1 ms. Phone cadence measurement pending (phone out for
user use ~2h).
2026-10-30 12:12:44 -04:00
docs/BUGS 120Hz: re-enable render-ahead under the corrected timing model 2026-10-30 12:12:44 -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: re-enable render-ahead under the corrected timing model 2026-10-30 12:12:44 -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).