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HANDOFF: note current Tauri architecture + pad_aosp drawing_enabled gotcha

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Greg Pomerantz 2026-11-02 11:10:31 -05:00
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HANDOFF.md
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# Gallery — development hand-off
> **CURRENT (2026-11-02): the active app is the Tauri/WebView port in
> `harnesses/gtauri/`** (package `wow.gmp.gallery`). Slint was concluded
> janky at its base level; egui and Tauri were A/B/C tested — Tauri won
> (0.00% dropped frames scripted on the 120 Hz phone). The Slint
> material below is historical. Current watch architecture: MediaStore
> ContentObserver in `MainActivity.kt` receives the changed URI, queries
> that one row, drops a one-line payload (`.ms_recent.N`: `A|id|path|size`
> or `D|id`), wakes Rust via zero-arg JNI; Rust applies it directly.
> FS walk = startup baseline + 5-min reconciliation + mtime-diff
> incremental; a walk that ERRORS is never applied (see scan.rs docs).
>
> **Emulator `pad_aosp` gotcha:** the image ships with
> `debug.hwui.drawing_enabled=0` — every window renders BLACK (HWUI
> drawing disabled system-wide). After each cold boot run:
> `adb shell setprop debug.hwui.drawing_enabled 1` (runtime prop, not
> persistent). Boot with `emulator -avd pad_aosp -no-window -no-audio`
> (AVD has hw.gpu.enabled=no; do NOT pass -gpu flags).
A high-performance image gallery for Android (primary), Linux and macOS,
written in Rust with the **Slint** UI toolkit. This document is the starting
point for development: it captures every decision, gotcha, and measurement