Color mixing function (#1332)

Co-authored-by: Laurenz <laurmaedje@gmail.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/typ/compute/construct.typ b/tests/typ/compute/construct.typ
index f094b6b2..ddd4c591 100644
--- a/tests/typ/compute/construct.typ
+++ b/tests/typ/compute/construct.typ
@@ -14,6 +14,26 @@
 #test(rgb("#133337").negate(), rgb(236, 204, 200))
 #test(white.lighten(100%), white)
 
+// Color mixing, in Oklab space by default.
+#test(color.mix(rgb("#ff0000"), rgb("#00ff00")), rgb("#d0a800"))
+#test(color.mix(rgb("#ff0000"), rgb("#00ff00"), space: "oklab"), rgb("#d0a800"))
+#test(color.mix(rgb("#ff0000"), rgb("#00ff00"), space: "srgb"), rgb("#808000"))
+
+#test(color.mix(red, green, blue), rgb("#909282"))
+#test(color.mix(red, blue, green), rgb("#909282"))
+#test(color.mix(blue, red, green), rgb("#909282"))
+
+// Mix with weights.
+#test(color.mix((red, 50%), (green, 50%)), rgb("#c0983b"))
+#test(color.mix((red, 0.5), (green, 0.5)), rgb("#c0983b"))
+#test(color.mix((red, 5), (green, 5)), rgb("#c0983b"))
+#test(color.mix((green, 5), (white, 0), (red, 5)), rgb("#c0983b"))
+#test(color.mix((red, 100%), (green, 0%)), red)
+#test(color.mix((red, 0%), (green, 100%)), green)
+#test(color.mix((rgb("#aaff00"), 25%), (rgb("#aa00ff"), 75%), space: "srgb"), rgb("#aa40bf"))
+#test(color.mix((rgb("#aaff00"), 50%), (rgb("#aa00ff"), 50%), space: "srgb"), rgb("#aa8080"))
+#test(color.mix((rgb("#aaff00"), 75%), (rgb("#aa00ff"), 25%), space: "srgb"), rgb("#aabf40"))
+
 ---
 // Test gray color conversion.
 // Ref: true
@@ -41,6 +61,18 @@
 #rgb(10%, 20%, 30%, false)
 
 ---
+// Error: 12-24 expected float or ratio, found string
+#color.mix((red, "yes"), (green, "no"))
+
+---
+// Error: 12-23 expected a color or color-weight pair
+#color.mix((red, 1, 2))
+
+---
+// Error: 31-38 expected "oklab" or "srgb"
+#color.mix(red, green, space: "cyber")
+
+---
 // Ref: true
 #let envelope = symbol(
   "🖂",