tabs and tab overview

hsl.c

@@ -0,0 +1,54 @@
+#include "hsl.h"
+
+#include <math.h>
+
+uint32_t
+hsl_to_rgb(int hue, int sat, int lum)
+{
+    double L = lum / 100.0;
+    double S = sat / 100.0;
+    double C = (1. - fabs(2. * L - 1.)) * S;
+
+    double X = C * (1. - fabs(fmod((double)hue / 60., 2.) - 1.));
+    double m = L - C / 2.;
+
+    double r, g, b;
+    if (hue >= 0 && hue <= 60) {
+        r = C;
+        g = X;
+        b = 0.;
+    } else if (hue >= 60 && hue <= 120) {
+        r = X;
+        g = C;
+        b = 0.;
+    } else if (hue >= 120 && hue <= 180) {
+        r = 0.;
+        g = C;
+        b = X;
+    } else if (hue >= 180 && hue <= 240) {
+        r = 0.;
+        g = X;
+        b = C;
+    } else if (hue >= 240 && hue <= 300) {
+        r = X;
+        g = 0.;
+        b = C;
+    } else if (hue >= 300 && hue <= 360) {
+        r = C;
+        g = 0.;
+        b = X;
+    } else {
+        r = 0.;
+        g = 0.;
+        b = 0.;
+    }
+
+    r += m;
+    g += m;
+    b += m;
+
+    return (
+        (uint8_t)round(r * 255.) << 16 |
+        (uint8_t)round(g * 255.) << 8 |
+        (uint8_t)round(b * 255.) << 0);
+}