From bfd8db0098413474514eab4dfebeb0803ad94fc4 Mon Sep 17 00:00:00 2001
From: jaseg <git@jaseg.net>
Date: Sun, 30 Aug 2020 12:17:33 +0200
Subject: Dimming works

---
 color.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 color.c

(limited to 'color.c')

diff --git a/color.c b/color.c
new file mode 100644
index 0000000..9522fd5
--- /dev/null
+++ b/color.c
@@ -0,0 +1,40 @@
+
+#include <math.h>
+
+#include "color.h"
+
+
+void hsv_to_rgb(struct hsvf *hsv, struct rgbf *rgb) {
+    float h = hsv->h, s = hsv->s, v = hsv->v;
+    float c = v * s; // Chroma
+    float hmod = fmodf(h * 6.0f, 6.0f);
+    float x = c * (1.0f - fabsf(fmodf(hmod, 2.0f) - 1.0f));
+    float m = v - c;
+
+    switch ((int)hmod) {
+        case 0:
+            rgb->r = c; rgb->g = x; rgb->b = 0;
+            break;
+        case 1:
+            rgb->r = x; rgb->g = c; rgb->b = 0;
+            break;
+        case 2:
+            rgb->r = 0; rgb->g = c; rgb->b = x;
+            break;
+        case 3:
+            rgb->r = 0; rgb->g = x; rgb->b = c;
+            break;
+        case 4:
+            rgb->r = x; rgb->g = 0; rgb->b = c;
+            break;
+        case 5:
+            rgb->r = c; rgb->g = 0; rgb->b = x;
+            break;
+        default:
+            rgb->r = 0; rgb->g = 0; rgb->b = 0;
+    }
+
+    rgb->r += m;
+    rgb->g += m;
+    rgb->b += m;
+}
-- 
cgit