David MannandClaude Opus 5.5 afb7de2d3a Performance: brush dab on a CMYK document within budget (#5108) ...

A brush dab on an A4 300 ppi CMYK page spent ~5 ms per touched tile in the
GPU canvas's tile upload: every pixel of the 256x256 tile went through the
CMYK -> sRGB transform on one thread. CMYK and Lab tiles now convert in
16-row bands in parallel, and a run of identical pixels (the transparent or
flat area around a dab) is converted once. Texels are bit-identical to the
per-pixel conversion.

The band workers enter the document's CMYK profile scope; before, the rayon
workers converting tiles did not, so a CMYK document tagged with its own
profile uploaded tiles through the built-in coated CMYK instead.

P33 (Windows 11, 32 threads, RTX 5070 Ti, 15 reps): p95 13.7-16.8 ms -> 2.6-3.3 ms.
enforce stays false: the committed baseline machine measures every row
over budget, so it is left for the next baseline.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

2026-10-13 18:10:21 +02:00

..

examples

GPU composite: reuse unchanged lower-stack chunks for property edits (#1169)

2026-10-11 02:07:48 -04:00

src

Performance: brush dab on a CMYK document within budget (#5108)

2026-10-13 18:10:21 +02:00

tests

perf(gpu): closing a document frees what the compositor holds for it (#4529) (#4772)

2026-10-13 12:07:27 -04:00

Cargo.toml

Performance: brush dab on a CMYK document within budget (#5108)

2026-10-13 18:10:21 +02:00