/usr/include/mapnik/util/hsl.hpp is in libmapnik-dev 2.2.0+ds1-6build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2013 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_HSL_HPP
#define MAPNIK_HSL_HPP
#include <cmath>
namespace mapnik {
static inline void rgb2hsl(unsigned char red, unsigned char green, unsigned char blue,
double & h, double & s, double & l) {
double r = red/255.0;
double g = green/255.0;
double b = blue/255.0;
double max = std::max(r,std::max(g,b));
double min = std::min(r,std::min(g,b));
double delta = max - min;
double gamma = max + min;
h = s = l = gamma / 2.0;
if (delta > 0.0) {
s = l > 0.5 ? delta / (2.0 - gamma) : delta / gamma;
if (max == r && max != g) h = (g - b) / delta + (g < b ? 6.0 : 0.0);
else if (max == g && max != b) h = (b - r) / delta + 2.0;
else if (max == b && max != r) h = (r - g) / delta + 4.0;
h /= 6.0;
}
}
static inline double hueToRGB(double m1, double m2, double h) {
// poor mans fmod
if(h < 0) h += 1;
if(h > 1) h -= 1;
if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
if (h * 2 < 1) return m2;
if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
return m1;
}
static inline void hsl2rgb(double h, double s, double l,
unsigned char & r, unsigned char & g, unsigned char & b) {
if (!s) {
r = g = b = static_cast<unsigned char>(l * 255);
}
double m2 = (l <= 0.5) ? l * (s + 1) : l + s - l * s;
double m1 = l * 2 - m2;
r = static_cast<unsigned char>(hueToRGB(m1, m2, h + 0.33333) * 255);
g = static_cast<unsigned char>(hueToRGB(m1, m2, h) * 255);
b = static_cast<unsigned char>(hueToRGB(m1, m2, h - 0.33333) * 255);
}
}
#endif // end MAPNIK_HSL_HPP
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