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Greg Pomerantz ed52109dba GPU-resident thumbnails: worker uploads to Slint's wgpu device (gputex) 
Root cause of scroll jank: first-present of each Image uploaded pixels
inside the render frame (~11-30 ms per 400px texture, 1.3 visible
hitches/s at 120 Hz; grey-image A/B: 20 -> 1). Slint has no render
thread and no pre-upload API.

Fix: decode worker creates the Rgba8Unorm texture on Slint's own wgpu
device (captured from GraphicsAPI::WGPU30 at RenderingSetup) and submits
the async upload; UI wraps it in Image::try_from(tex). Zero pixel work
in the render frame. CPU from_rgba8 fallback retained.

Measured (Pixel 9 Pro 120 Hz, 400 px, per-frame FR hook):
  before: >10ms renders 20 in 15s (max 30 ms), 3 borderline 8-9 ms
  after:  0 mid-scroll renders > 4.4 ms (median 1.9, p95 2.9);
          only post-idle first-frames expensive (invisible)

Also: FR per-frame logging via set_rendering_notifier; APLY timestamp.
2026-10-28 10:57:15 -04:00
scripts GPU-resident thumbnails: worker uploads to Slint's wgpu device (gputex) 2026-10-28 10:57:15 -04:00
src GPU-resident thumbnails: worker uploads to Slint's wgpu device (gputex) 2026-10-28 10:57:15 -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 GPU-resident thumbnails: worker uploads to Slint's wgpu device (gputex) 2026-10-28 10:57:15 -04:00
Cargo.toml GPU-resident thumbnails: worker uploads to Slint's wgpu device (gputex) 2026-10-28 10:57:15 -04:00
HANDOFF.md GPU-resident thumbnails: worker uploads to Slint's wgpu device (gputex) 2026-10-28 10:57:15 -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).