Fix #3621: function-based PDF shadings keep their colours

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PDF import turned every function-based shading (ShadingType 1) into a
flat mid-grey. Chromium writes a CSS repeating-linear-gradient this way,
so a red and white hatch came in as a grey bar.

A function-based shading whose colour changes along one axis of its
domain only now becomes a linear gradient across the domain: stops
sampled along that axis, each hard colour change (found by halving the
interval between two samples) two stops at one offset. One whose colour
changes in two directions comes in as its average colour, with a
warning. Either paints only over the shading's domain.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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This commit is contained in:

Patrick Lenzen

2026-10-24 19:27:44 +07:00

committed by bflatastic

co-authored by Claude Opus 5.5

parent 95436e7212

commit 095d2bd2fd

4 changed files with 268 additions and 25 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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docs/target-app-parity.md

+3 -1

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