A fast, lightweight and minimalistic Wayland terminal emulator
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#include "hsl.h"
#include <math.h>
#include "util.h"
void
rgb_to_hsl(uint32_t rgb, int *hue, int *sat, int *lum)
{
double r = (double)((rgb >> 16) & 0xff) / 255.;
double g = (double)((rgb >> 8) & 0xff) / 255.;
double b = (double)((rgb >> 0) & 0xff) / 255.;
double x_max = max(max(r, g), b);
double x_min = min(min(r, g), b);
double V = x_max;
double C = x_max - x_min;
double L = (x_max + x_min) / 2.;
*lum = 100 * L;
if (C == 0.0)
*hue = 0;
else if (V == r)
*hue = 60. * (0. + (g - b) / C);
else if (V == g)
*hue = 60. * (2. + (b - r) / C);
else if (V == b)
*hue = 60. * (4. + (r - g) / C);
if (*hue < 0)
*hue += 360;
double S = C == 0.0
? 0
: C / (1. - fabs(2. * L - 1.));
*sat = 100 * S;
}
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 (
(int)round(r * 255.) << 16 |
(int)round(g * 255.) << 8 |
(int)round(b * 255.) << 0);
}