Fix CMYK on gradients (#3142)

2 files changed, 27 insertions, 0 deletions

diff --git a/tests/ref/bugs/gradient-cmyk-encode.png b/tests/ref/bugs/gradient-cmyk-encode.png
new file mode 100644
index 00000000..7bd82cce
--- /dev/null
+++ b/tests/ref/bugs/gradient-cmyk-encode.png
diff --git a/tests/typ/bugs/gradient-cmyk-encode.typ b/tests/typ/bugs/gradient-cmyk-encode.typ
new file mode 100644
index 00000000..5e0b58dc
--- /dev/null
+++ b/tests/typ/bugs/gradient-cmyk-encode.typ
@@ -0,0 +1,27 @@
+// Test that CMYK works on gradients
+
+---
+#set page(margin: 0pt, width: 200pt, height: auto)
+
+#let violet = cmyk(75%, 80%, 0%, 0%)
+#let blue = cmyk(75%, 30%, 0%, 0%)
+
+#rect(
+  width: 100%,
+  height: 30pt,
+  fill: gradient.linear(violet, blue)
+)
+
+#rect(
+  width: 100%,
+  height: 30pt,
+  fill: gradient.linear(rgb(violet), rgb(blue))
+)
+
+// In PDF format, this gradient can look different from the others.
+// This is because PDF readers do weird things with CMYK.
+#rect(
+  width: 100%,
+  height: 30pt,
+  fill: gradient.linear(violet, blue, space: cmyk)
+)