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/**
* @file v3color.cpp
* @brief LLColor3 class implementation.
*
* $LicenseInfo:firstyear=2000&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* 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;
* version 2.1 of the License only.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "v3color.h"
#include "v4color.h"
#include "v4math.h"
LLColor3 LLColor3::white(1.0f, 1.0f, 1.0f);
LLColor3 LLColor3::black(0.0f, 0.0f, 0.0f);
LLColor3 LLColor3::grey(0.5f, 0.5f, 0.5f);
LLColor3::LLColor3(const LLColor4& a)
{
mV[VRED] = a.mV[VRED];
mV[VGREEN] = a.mV[VGREEN];
mV[VBLUE] = a.mV[VBLUE];
}
LLColor3::LLColor3(const LLVector4& a)
{
mV[VRED] = a.mV[VRED];
mV[VGREEN] = a.mV[VGREEN];
mV[VBLUE] = a.mV[VBLUE];
}
LLColor3::LLColor3(const LLSD& sd)
{
setValue(sd);
}
const LLColor3& LLColor3::operator=(const LLColor4& a)
{
mV[VRED] = a.mV[VRED];
mV[VGREEN] = a.mV[VGREEN];
mV[VBLUE] = a.mV[VBLUE];
return (*this);
}
std::ostream& operator<<(std::ostream& s, const LLColor3& a)
{
s << "{ " << a.mV[VRED] << ", " << a.mV[VGREEN] << ", " << a.mV[VBLUE] << " }";
return s;
}
static F32 hueToRgb(F32 val1In, F32 val2In, F32 valHUeIn)
{
if (valHUeIn < 0.0f)
valHUeIn += 1.0f;
if (valHUeIn > 1.0f)
valHUeIn -= 1.0f;
if ((6.0f * valHUeIn) < 1.0f)
return (val1In + (val2In - val1In) * 6.0f * valHUeIn);
if ((2.0f * valHUeIn) < 1.0f)
return (val2In);
if ((3.0f * valHUeIn) < 2.0f)
return (val1In + (val2In - val1In) * ((2.0f / 3.0f) - valHUeIn) * 6.0f);
return (val1In);
}
void LLColor3::setHSL(F32 hValIn, F32 sValIn, F32 lValIn)
{
if (sValIn < 0.00001f)
{
mV[VRED] = lValIn;
mV[VGREEN] = lValIn;
mV[VBLUE] = lValIn;
}
else
{
F32 interVal1;
F32 interVal2;
if (lValIn < 0.5f)
interVal2 = lValIn * (1.0f + sValIn);
else
interVal2 = (lValIn + sValIn) - (sValIn * lValIn);
interVal1 = 2.0f * lValIn - interVal2;
mV[VRED] = hueToRgb(interVal1, interVal2, hValIn + (1.f / 3.f));
mV[VGREEN] = hueToRgb(interVal1, interVal2, hValIn);
mV[VBLUE] = hueToRgb(interVal1, interVal2, hValIn - (1.f / 3.f));
}
}
void LLColor3::calcHSL(F32* hue, F32* saturation, F32* luminance) const
{
F32 var_R = mV[VRED];
F32 var_G = mV[VGREEN];
F32 var_B = mV[VBLUE];
F32 var_Min = (var_R < (var_G < var_B ? var_G : var_B) ? var_R : (var_G < var_B ? var_G : var_B));
F32 var_Max = (var_R > (var_G > var_B ? var_G : var_B) ? var_R : (var_G > var_B ? var_G : var_B));
F32 del_Max = var_Max - var_Min;
F32 L = (var_Max + var_Min) / 2.0f;
F32 H = 0.0f;
F32 S = 0.0f;
if (del_Max == 0.0f)
{
H = 0.0f;
S = 0.0f;
}
else
{
if (L < 0.5)
S = del_Max / (var_Max + var_Min);
else
S = del_Max / (2.0f - var_Max - var_Min);
F32 del_R = (((var_Max - var_R) / 6.0f) + (del_Max / 2.0f)) / del_Max;
F32 del_G = (((var_Max - var_G) / 6.0f) + (del_Max / 2.0f)) / del_Max;
F32 del_B = (((var_Max - var_B) / 6.0f) + (del_Max / 2.0f)) / del_Max;
if (var_R >= var_Max)
H = del_B - del_G;
else if (var_G >= var_Max)
H = (1.0f / 3.0f) + del_R - del_B;
else if (var_B >= var_Max)
H = (2.0f / 3.0f) + del_G - del_R;
if (H < 0.0f)
H += 1.0f;
if (H > 1.0f)
H -= 1.0f;
}
if (hue)
*hue = H;
if (saturation)
*saturation = S;
if (luminance)
*luminance = L;
}
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