1 files changed, 88 insertions, 0 deletions

diff --git a/src/functions/colors/_oklch.scss b/src/functions/colors/_oklch.scss
new file mode 100644
index 0000000..e3df041
--- /dev/null
+++ b/src/functions/colors/_oklch.scss
@@ -0,0 +1,88 @@
+/* stylelint-disable scss/dollar-variable-pattern */
+/* stylelint-disable scss/at-function-pattern */
+
+@use 'sass:list';
+@use 'sass:math';
+@use 'sass:meta';
+@use 'sass:string';
+@use '@oddbird/blend/sass/convert' as blend-convert;
+@use '@oddbird/blend/sass/utils/pow';
+@use 'iro-sass/src/index' as iro;
+
+@function lin_sRGB_to_Oklab($color) {
+    $r_: list.nth($color, 1);
+    $g_: list.nth($color, 2);
+    $b_: list.nth($color, 3);
+
+    $l: pow.cbrt(0.4122214708 * $r_ + 0.5363325363 * $g_ + 0.0514459929 * $b_);
+    $m: pow.cbrt(0.2119034982 * $r_ + 0.6806995451 * $g_ + 0.1073969566 * $b_);
+        $s: pow.cbrt(0.0883024619 * $r_ + 0.2817188376 * $g_ + 0.6299787005 * $b_);
+    
+    @return (
+        0.2104542553 * $l + 0.7936177850 * $m - 0.0040720468 * $s,
+        1.9779984951 * $l - 2.4285922050 * $m + 0.4505937099 * $s,
+        0.0259040371 * $l + 0.7827717662 * $m - 0.8086757660 * $s,
+    );
+}
+
+@function Oklab_to_lin_sRGB($color) {
+    $l_: list.nth($color, 1);
+    $a_: list.nth($color, 2);
+    $b_: list.nth($color, 3);
+
+    $l: $l_ + 0.3963377774 * $a_ + 0.2158037573 * $b_;
+    $m: $l_ - 0.1055613458 * $a_ - 0.0638541728 * $b_;
+    $s: $l_ - 0.0894841775 * $a_ - 1.2914855480 * $b_;
+
+    $l: $l * $l * $l;
+    $m: $m * $m * $m;
+    $s: $s * $s * $s;
+    
+    @return (
+                 4.0767416621 * $l - 3.3077115913 * $m + 0.2309699292 * $s,
+                -1.2684380046 * $l + 2.6097574011 * $m - 0.3413193965 * $s,
+                -0.0041960863 * $l - 0.7034186147 * $m + 1.7076147010 * $s,
+    );
+}
+
+@function oklch($arg) {
+    $l: math.div(list.nth($arg, 1), 100%);
+    $c: list.nth($arg, 2);
+    $h: list.nth($arg, 3);
+
+    @return blend-convert.rgbToSass(
+        blend-convert.gam_sRGB(
+            Oklab_to_lin_sRGB(
+                blend-convert.LCH_to_Lab($l $c $h)
+            )
+        )
+    );
+}
+
+@function parse-oklch($color) {
+    @if meta.type-of($color) == 'color' {
+        @return blend-convert.Lab_to_LCH(
+            lin_sRGB_to_Oklab(
+                blend-convert.lin_sRGB(
+                    blend-convert.sassToRgb($color)
+                )
+            )
+        );
+    }
+
+    @if meta.type-of($color) != 'string' {
+        @return null;
+    }
+
+    @if string.slice($color, 1, 6) == 'oklch(' {
+        $args: string.split(string.slice($color, 7, -2), ' ');
+
+        $l: math.div(iro.fn-to-number(list.nth($args, 1)), 100%);
+        $c: iro.fn-to-number(list.nth($args, 2));
+        $h: iro.fn-to-number(list.nth($args, 3));
+
+        @return $l $c $h;
+    }
+
+    @return null;
+}