gallery/vendor/i-slint-backend-android-activity-1.18.1
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
..
java Jank-hunt perf feature: FR/STG/DECODE instrumentation, off by default 2026-10-29 08:11:51 -04:00
LICENSES Jank-hunt perf feature: FR/STG/DECODE instrumentation, off by default 2026-10-29 08:11:51 -04:00
.cargo_vcs_info.json Jank-hunt perf feature: FR/STG/DECODE instrumentation, off by default 2026-10-29 08:11:51 -04:00
.cargo-ok Jank-hunt perf feature: FR/STG/DECODE instrumentation, off by default 2026-10-29 08:11:51 -04:00
androidwindowadapter.rs 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 Jank-hunt perf feature: FR/STG/DECODE instrumentation, off by default 2026-10-29 08:11:51 -04:00
Cargo.lock Jank-hunt perf feature: FR/STG/DECODE instrumentation, off by default 2026-10-29 08:11:51 -04:00
Cargo.toml 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.orig Jank-hunt perf feature: FR/STG/DECODE instrumentation, off by default 2026-10-29 08:11:51 -04:00
javahelper.rs Jank-hunt perf feature: FR/STG/DECODE instrumentation, off by default 2026-10-29 08:11:51 -04:00
lib.rs 120Hz: re-enable render-ahead under the corrected timing model 2026-10-30 12:12:44 -04:00
README.md Jank-hunt perf feature: FR/STG/DECODE instrumentation, off by default 2026-10-29 08:11:51 -04:00
stg.rs 120Hz: re-enable render-ahead under the corrected timing model 2026-10-30 12:12:44 -04:00
vsync.rs 120Hz hunt: EW wake probe + poll/render CPU-time splits; sltest baseline 2026-10-30 11:59:39 -04:00

NOTE: This library is an internal crate of the Slint project.

WARNING: This crate does not follow the semver convention for versioning and can only be used with version = "=x.y.z" in Cargo.toml.

Slint Android Activity Backend

This crate implements the Android backend/platform for Slint.

It uses the android-activity crate to initialize the app and provide events handling.

It can be used by using functions from the slint::android module