From cfb767346e7879ea021187856a61eedaa1d46f7c Mon Sep 17 00:00:00 2001
From: frozolotl <44589151+frozolotl@users.noreply.github.com>
Date: Wed, 8 Nov 2023 20:10:37 +1000
Subject: [PATCH] Fix OkLab color negation (#2609)

This changes negation to effectively rotate hue by 180deg.
Previously, negation failed in certain cases and produced unexpected results.
---
 crates/typst/src/geom/color.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/typst/src/geom/color.rs b/crates/typst/src/geom/color.rs
index bf04408c..3a02a8c2 100644
--- a/crates/typst/src/geom/color.rs
+++ b/crates/typst/src/geom/color.rs
@@ -906,7 +906,7 @@ impl Color {
     pub fn negate(self) -> Color {
         match self {
             Self::Luma(c) => Self::Luma(Luma::new(1.0 - c.luma)),
-            Self::Oklab(c) => Self::Oklab(Oklab::new(c.l, 1.0 - c.a, 1.0 - c.b, c.alpha)),
+            Self::Oklab(c) => Self::Oklab(Oklab::new(c.l, -c.a, -c.b, c.alpha)),
             Self::LinearRgb(c) => Self::LinearRgb(LinearRgba::new(
                 1.0 - c.red,
                 1.0 - c.green,