4 static float min3(float a, float b, float c)
6 if(a < b && a < c) return a;
10 static float max3(float a, float b, float c)
12 if(a > b && a > c) return a;
16 void rgb_to_hsv(float r, float g, float b, float *h, float *s, float *v)
18 float min, max, delta;
34 if(!delta) delta = 1.0f;
39 *h = 2 + (b - r) / delta;
41 *h = 4 + (r - g) / delta;
50 #define RETRGB(red, green, blue) \
58 void hsv_to_rgb(float h, float s, float v, float *r, float *g, float *b)
60 float sec, frac, o, p, q;
68 sec = floor(h * (360.0f / 60.0f));
69 frac = (h * (360.0f / 60.0f)) - sec;
72 p = v * (1.0f - s * frac);
73 q = v * (1.0f - s * (1.0f - frac));
78 case 0: RETRGB(v, q, o);
79 case 1: RETRGB(p, v, o);
80 case 2: RETRGB(o, v, q);
81 case 3: RETRGB(o, p, v);
82 case 4: RETRGB(q, o, v);
83 case 5: RETRGB(v, o, p);