154 lines
3.9 KiB
C++
154 lines
3.9 KiB
C++
/**
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* @file v3color.cpp
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* @brief LLColor3 class implementation.
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*
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* $LicenseInfo:firstyear=2000&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#include "linden_common.h"
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#include "v3color.h"
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#include "v4color.h"
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#include "v4math.h"
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LLColor3 LLColor3::white(1.0f, 1.0f, 1.0f);
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LLColor3 LLColor3::black(0.0f, 0.0f, 0.0f);
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LLColor3 LLColor3::grey (0.5f, 0.5f, 0.5f);
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LLColor3::LLColor3(const LLColor4 &a)
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{
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mV[0] = a.mV[0];
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mV[1] = a.mV[1];
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mV[2] = a.mV[2];
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}
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LLColor3::LLColor3(const LLVector4 &a)
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{
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mV[0] = a.mV[0];
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mV[1] = a.mV[1];
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mV[2] = a.mV[2];
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}
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LLColor3::LLColor3(const LLSD &sd)
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{
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setValue(sd);
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}
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const LLColor3& LLColor3::operator=(const LLColor4 &a)
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{
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mV[0] = a.mV[0];
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mV[1] = a.mV[1];
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mV[2] = a.mV[2];
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return (*this);
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}
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std::ostream& operator<<(std::ostream& s, const LLColor3 &a)
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{
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s << "{ " << a.mV[VX] << ", " << a.mV[VY] << ", " << a.mV[VZ] << " }";
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return s;
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}
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static F32 hueToRgb ( F32 val1In, F32 val2In, F32 valHUeIn )
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{
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if ( valHUeIn < 0.0f ) valHUeIn += 1.0f;
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if ( valHUeIn > 1.0f ) valHUeIn -= 1.0f;
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if ( ( 6.0f * valHUeIn ) < 1.0f ) return ( val1In + ( val2In - val1In ) * 6.0f * valHUeIn );
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if ( ( 2.0f * valHUeIn ) < 1.0f ) return ( val2In );
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if ( ( 3.0f * valHUeIn ) < 2.0f ) return ( val1In + ( val2In - val1In ) * ( ( 2.0f / 3.0f ) - valHUeIn ) * 6.0f );
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return ( val1In );
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}
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void LLColor3::setHSL ( F32 hValIn, F32 sValIn, F32 lValIn)
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{
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if ( sValIn < 0.00001f )
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{
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mV[VRED] = lValIn;
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mV[VGREEN] = lValIn;
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mV[VBLUE] = lValIn;
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}
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else
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{
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F32 interVal1;
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F32 interVal2;
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if ( lValIn < 0.5f )
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interVal2 = lValIn * ( 1.0f + sValIn );
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else
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interVal2 = ( lValIn + sValIn ) - ( sValIn * lValIn );
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interVal1 = 2.0f * lValIn - interVal2;
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mV[VRED] = hueToRgb ( interVal1, interVal2, hValIn + ( 1.f / 3.f ) );
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mV[VGREEN] = hueToRgb ( interVal1, interVal2, hValIn );
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mV[VBLUE] = hueToRgb ( interVal1, interVal2, hValIn - ( 1.f / 3.f ) );
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}
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}
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void LLColor3::calcHSL(F32* hue, F32* saturation, F32* luminance) const
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{
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F32 var_R = mV[VRED];
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F32 var_G = mV[VGREEN];
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F32 var_B = mV[VBLUE];
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F32 var_Min = ( var_R < ( var_G < var_B ? var_G : var_B ) ? var_R : ( var_G < var_B ? var_G : var_B ) );
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F32 var_Max = ( var_R > ( var_G > var_B ? var_G : var_B ) ? var_R : ( var_G > var_B ? var_G : var_B ) );
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F32 del_Max = var_Max - var_Min;
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F32 L = ( var_Max + var_Min ) / 2.0f;
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F32 H = 0.0f;
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F32 S = 0.0f;
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if ( del_Max == 0.0f )
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{
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H = 0.0f;
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S = 0.0f;
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}
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else
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{
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if ( L < 0.5 )
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S = del_Max / ( var_Max + var_Min );
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else
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S = del_Max / ( 2.0f - var_Max - var_Min );
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F32 del_R = ( ( ( var_Max - var_R ) / 6.0f ) + ( del_Max / 2.0f ) ) / del_Max;
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F32 del_G = ( ( ( var_Max - var_G ) / 6.0f ) + ( del_Max / 2.0f ) ) / del_Max;
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F32 del_B = ( ( ( var_Max - var_B ) / 6.0f ) + ( del_Max / 2.0f ) ) / del_Max;
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if ( var_R >= var_Max )
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H = del_B - del_G;
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else
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if ( var_G >= var_Max )
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H = ( 1.0f / 3.0f ) + del_R - del_B;
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else
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if ( var_B >= var_Max )
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H = ( 2.0f / 3.0f ) + del_G - del_R;
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if ( H < 0.0f ) H += 1.0f;
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if ( H > 1.0f ) H -= 1.0f;
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}
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if (hue) *hue = H;
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if (saturation) *saturation = S;
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if (luminance) *luminance = L;
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}
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