Khawar Zamman Wani 539f5bd58f perf(algo): row-parallel local_sharpen with fast-path protect_detail (#5426) (#9651) ...

* perf(algo): row-parallel local_sharpen with fast-path protect_detail (#5426)

Refs #5426. Follow-up to #5499.

Cause:
While #5499 parallelized local_blur and the per-dab mix in DabTool::Focus,
local_sharpen in crates/algo/src/retouch.rs remained single-threaded.
In addition, protect_detail redundantly evaluated coordinate clamping
and strided memory lookups across 8 neighbors inside the per-channel
inner loop for every pixel in the dab. On large brush sizes (e.g. 1000–2500 px),
strokes took seconds and stalled the application.

Change:
- Process local_sharpen window rows in parallel with Rayon across threads,
  with wasm32 serial fallback matching local_blur.
- Hoist protect_detail 3x3 neighborhood offset calculations outside the
  channel loop.
- Fast-path interior pixels (x > 0 && x + 1 < w && y > 0 && y + 1 < h)
  with direct stride offsets, skipping boundary clamping entirely for >99.9%
  of pixels in large brush dabs.
- Add retouch_sharpen_exact integration test verifying bit-for-bit parity
  against the frozen scalar implementation across layouts, edges, and channels.

* bench(engine): add bench_sharpen_tool example

2026-10-29 12:11:22 -04:00

..

liquify_freeze_formats.rs

test(liquify): expand freeze-boundary regression coverage (#8082)

2026-10-23 17:40:45 -04:00

liquify_source_footprint.rs

Build each crate's integration tests as one binary

2026-10-22 16:55:34 +00:00

main.rs

perf(algo): row-parallel local_sharpen with fast-path protect_detail (#5426) (#9651)

2026-10-29 12:11:22 -04:00

retouch_blur_exact.rs

Build each crate's integration tests as one binary

2026-10-22 16:55:34 +00:00

retouch_sharpen_exact.rs

perf(algo): row-parallel local_sharpen with fast-path protect_detail (#5426) (#9651)

2026-10-29 12:11:22 -04:00

warp_clipped.rs

Build each crate's integration tests as one binary

2026-10-22 16:55:34 +00:00