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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2005-12-02
* Description : 8-16 bits color container.
*
* Copyright (C) 2005-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
*
* RGB<->HLS transformation algorithms are inspired from methods
* describe at this url :
* http://www.paris-pc-gis.com/MI_Enviro/Colors/color_models.htm
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software Foundation;
* either version 2, or (at your option)
* any later version.
*
* This program 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.
*
* ============================================================ */
// C++ includes.
#include <cmath>
// Local includes.
#include "ddebug.h"
#include "dcolor.h"
namespace Digikam
{
/*
DColor::DColor(const DColor& color)
{
m_red = color.m_red;
m_green = color.m_green;
m_blue = color.m_blue;
m_alpha = color.m_alpha;
m_sixteenBit = color.m_sixteenBit;
}
*/
DColor::DColor(const TQColor& color, bool sixteenBit)
{
// initialize as eight bit
m_red = color.red();
m_green = color.green();
m_blue = color.blue();
m_alpha = 255;
m_sixteenBit = false;
// convert to sixteen bit if requested
if (sixteenBit)
convertToSixteenBit();
}
/*
DColor& DColor::operator=(const DColor& color)
{
m_red = color.m_red;
m_green = color.m_green;
m_blue = color.m_blue;
m_alpha = color.m_alpha;
m_sixteenBit = color.m_sixteenBit;
return *this;
}
*/
TQColor DColor::getTQColor() const
{
if (m_sixteenBit)
{
DColor eightBit(*this);
eightBit.convertToEightBit();
return eightBit.getTQColor();
}
return (TQColor(m_red, m_green, m_blue));
}
void DColor::convertToSixteenBit()
{
if (m_sixteenBit)
return;
m_red = (m_red + 1) * 256 - 1;
m_green = (m_green + 1) * 256 - 1;
m_blue = (m_blue + 1) * 256 - 1;
m_alpha = (m_alpha + 1) * 256 - 1;
m_sixteenBit = true;
}
void DColor::convertToEightBit()
{
if (!m_sixteenBit)
return;
m_red = (m_red + 1) / 256 - 1;
m_green = (m_green + 1) / 256 - 1;
m_blue = (m_blue + 1) / 256 - 1;
m_alpha = (m_alpha + 1) / 256 - 1;
m_sixteenBit = false;
}
void DColor::getHSL(int* h, int* s, int* l) const
{
double min;
double max;
double red;
double green;
double blue;
double delta;
double sum;
double hue, sat, lig;
double range = m_sixteenBit ? 65535.0 : 255.0;
red = m_red / range;
green = m_green / range;
blue = m_blue / range;
if (red > green)
{
if (red > blue)
max = red;
else
max = blue;
if (green < blue)
min = green;
else
min = blue;
}
else
{
if (green > blue)
max = green;
else
max = blue;
if (red < blue)
min = red;
else
min = blue;
}
sum = max + min;
lig = sum / 2;
sat = 0;
hue = 0;
if (max != min)
{
delta = max - min;
if (lig <= 0.5)
sat = delta / sum;
else
sat = delta / (2 - sum);
if (red == max)
hue = (green - blue) / delta;
else if (green == max)
hue = 2 + (blue - red) / delta;
else if (blue == max)
hue = 4 + (red - green) / delta;
if (hue < 0)
hue += 6;
if (hue > 6)
hue -= 6;
hue *= 60;
}
*h = lround(hue * range / 360.0);
*s = lround(sat * range);
*l = lround(lig * range);
}
void DColor::setRGB(int h, int s, int l, bool sixteenBit)
{
double hue;
double lightness;
double saturation;
double m1, m2;
double r, g, b;
double range = m_sixteenBit ? 65535.0 : 255.0;
if (s == 0)
{
m_red = l;
m_green = l;
m_blue = l;
}
else
{
hue = (double)(h * 360.0 / range);
lightness = (double)(l / range);
saturation = (double)(s / range);
if (lightness <= 0.5)
m2 = lightness * (1 + saturation);
else
m2 = lightness + saturation - lightness * saturation;
m1 = 2 * lightness - m2;
double mh;
mh = hue + 120;
while (mh > 360)
mh -= 360;
while (mh < 0)
mh += 360;
if (mh < 60)
r = m1 + (m2 - m1) * mh / 60;
else if (mh < 180)
r = m2;
else if (mh < 240)
r = m1 + (m2 - m1) * (240 - mh) / 60;
else
r = m1;
mh = hue;
while (mh > 360)
mh -= 360;
while (mh < 0)
mh += 360;
if (mh < 60)
g = m1 + (m2 - m1) * mh / 60;
else if (mh < 180)
g = m2;
else if (mh < 240)
g = m1 + (m2 - m1) * (240 - mh) / 60;
else
g = m1;
mh = hue - 120;
while (mh > 360)
mh -= 360;
while (mh < 0)
mh += 360;
if (mh < 60)
b = m1 + (m2 - m1) * mh / 60;
else if (mh < 180)
b = m2;
else if (mh < 240)
b = m1 + (m2 - m1) * (240 - mh) / 60;
else
b = m1;
m_red = lround(r * range);
m_green = lround(g * range);
m_blue = lround(b * range);
}
m_sixteenBit = sixteenBit;
// Fully opaque color.
if (m_sixteenBit)
m_alpha = 65535;
else
m_alpha = 255;
}
} // NameSpace Digikam
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