An RGB pattern (every built-in one) showed in colour as a pattern fill or
Pattern Overlay in a Grayscale or CMYK document, unlike Edit > Fill, the
export, and Photoshop, which fills in grey but keeps the pattern's colours
(a Grayscale round trip brings them back).
pattern::pattern_rgba projects a pattern's pixels through the document's
mode when painted; the CPU prepared tiles and the GPU pattern textures use
it. Patterns themselves are unchanged.
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
Reserve up to 64 MiB of converted pattern pixels and 64 entries for
one render call, including pending initializers and all export bands.
Initialize outside the map lock on the requesting CMYK-scoped worker.
Budget exhaustion retains the existing uncached conversion path;
the retained-payload budget is not a cap on transient fallback buffers.
