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* GPU plan: cache adjustment LUT rows between plans (#11498) adjustment_program rebuilt the Levels/Curves tone tables on every plan (twice per refresh), about 1-2 ms per Levels layer each time. Keep the rows of Levels, Curves, Color Balance and Hue/Saturation ranges in a 32-entry most-recently-used cache (photocraft_compose::lut_rows, at most 32 x 3 x 16 KiB = 1.5 MiB), built outside the lock. Entries are keyed by a u64 hash of exactly what each row builder reads, fields destructured in full and floats by bits (-0.0 and 0.0 stay apart). Hue/Saturation master sliders don't add entries; Hue/Sat ranges and Color Balance don't depend on depth. Edit > Purge > All drops the cache, and a filled cache enables it. Release, per call: Levels 8/16-bit 1.10 -> 0.003-0.018 ms, Curves 0.16 -> 0.018, Color Balance 0.11 -> 0.001-0.015, Hue/Sat ranges 0.05 -> 0.008-0.018. The tables are identical, so rendering is unchanged. Tests: cached rows match fresh tables bit for bit at 8/16/32-bit, hits and LRU eviction on a local cache, key coverage, and Purge All releasing the cache. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * compose: rustfmt the LUT row cache tests (#11498) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * GPU plan: test that plans read cached LUT rows and that curve points key them (#11498) Plant rows no builder makes under a fresh key and check the planner returns them, and check that moving a Curves point changes its key (review on #11539). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * compose: prevent in-flight LUT builds from undoing purge --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: FredApps <FredApps@users.noreply.github.com>