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gems: HSV-to-RGB color-conversion function

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Norman Feske 2015-07-01 11:19:12 +02:00 committed by Christian Helmuth
parent fd45a70acc
commit e45e01ee8e
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/*
* \brief Color-conversion between HSV and RGB color spaces
* \date 2015-07-01
* \author Norman Feske
*/
/*
* Copyright (C) 2015 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__GEMS__COLOR_HSV_H_
#define _INCLUDE__GEMS__COLOR_HSV_H_
#include <util/color.h>
/**
* Create color from specified hue, saturation, and value
*/
static inline Genode::Color color_from_hsv(unsigned h, unsigned s, unsigned v)
{
typedef Genode::Color Color;
if (s == 0)
return Color(v, v, v);
unsigned char const region = h / 43;
unsigned char const remainder = (h - (region*43)) * 6;
unsigned char const p = (v*(255 - s)) >> 8,
q = (v*(255 - ((s*remainder) >> 8))) >> 8,
t = (v*(255 - ((s*(255 - remainder)) >> 8))) >> 8;
switch (region) {
case 0: return Color(v, t, p);
case 1: return Color(q, v, p);
case 2: return Color(p, v, t);
case 3: return Color(p, q, v);
case 4: return Color(t, p, v);
}
return Color(v, p, q);
}
#endif /* _INCLUDE__GEMS__COLOR_HSV_H_ */