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/*
* Copyright (C) 2002 Terence M. Welsh
* Ported to Linux by Tugrul Galatali <tugrul@galatali.com>
*
* Rgbhsl is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Rgbhsl 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// This library converts between colors defined with RGB values and HSL
// values. It also finds in-between colors by moving linearly through
// HSL space.
// All functions take values for r, g, b, h, s, and l between 0.0 and 1.0
// (RGB = red, green, blue; HSL = hue, saturation, luminosity)
#ifndef RGBHSL_H
#define RGBHSL_H
void rgb2hsl (float r, float g, float b, float &h, float &s, float &l);
void hsl2rgb (float h, float s, float l, float &r, float &g, float &b);
// For these 'tween functions, a tween value of 0.0 will output the first
// color while a tween value of 1.0 will output the second color.
// A value of 0 for direction indicates a positive progression around
// the color wheel (i.e. red -> yellow -> green -> cyan...). A value of
// 1 does the opposite.
void hslTween (float h1, float s1, float l1, float h2, float s2, float l2, float tween, int direction, float &outh, float &outs, float &outl);
void rgbTween (float r1, float g1, float b1, float r2, float g2, float b2, float tween, int direction, float &outr, float &outg, float &outb);
#endif // RGBHSL_H
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