/**
 * @file v4color.cpp
 * @brief LLColor4 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 "llboost.h"

#include "v4color.h"
#include "v4coloru.h"
#include "v3color.h"
#include "v4math.h"
#include "llmath.h"

// LLColor4

//////////////////////////////////////////////////////////////////////////////

LLColor4 LLColor4::red(     1.f, 0.f, 0.f, 1.f);
LLColor4 LLColor4::green(   0.f, 1.f, 0.f, 1.f);
LLColor4 LLColor4::blue(    0.f, 0.f, 1.f, 1.f);
LLColor4 LLColor4::black(   0.f, 0.f, 0.f, 1.f);
LLColor4 LLColor4::yellow(  1.f, 1.f, 0.f, 1.f);
LLColor4 LLColor4::magenta( 1.0f, 0.0f, 1.0f, 1.0f);
LLColor4 LLColor4::cyan(    0.0f, 1.0f, 1.0f, 1.0f);
LLColor4 LLColor4::white(   1.f, 1.f, 1.f, 1.f);
LLColor4 LLColor4::smoke(   0.5f, 0.5f, 0.5f, 0.5f);
LLColor4 LLColor4::grey(    0.5f, 0.5f, 0.5f, 1.0f);
LLColor4 LLColor4::orange(  1.f, 0.5, 0.f, 1.f );
LLColor4 LLColor4::purple(  0.6f, 0.2f, 0.8f, 1.0f);
LLColor4 LLColor4::pink(    1.0f, 0.5f, 0.8f, 1.0f);
LLColor4 LLColor4::transparent( 0.f, 0.f, 0.f, 0.f );

//////////////////////////////////////////////////////////////////////////////

LLColor4 LLColor4::grey1(0.8f, 0.8f, 0.8f, 1.0f);
LLColor4 LLColor4::grey2(0.6f, 0.6f, 0.6f, 1.0f);
LLColor4 LLColor4::grey3(0.4f, 0.4f, 0.4f, 1.0f);
LLColor4 LLColor4::grey4(0.3f, 0.3f, 0.3f, 1.0f);

LLColor4 LLColor4::red1(1.0f, 0.0f, 0.0f, 1.0f);
LLColor4 LLColor4::red2(0.6f, 0.0f, 0.0f, 1.0f);
LLColor4 LLColor4::red3(1.0f, 0.2f, 0.2f, 1.0f);
LLColor4 LLColor4::red4(0.5f, 0.1f, 0.1f, 1.0f);
LLColor4 LLColor4::red5(0.8f, 0.1f, 0.0f, 1.0f);

LLColor4 LLColor4::green1(0.0f, 1.0f, 0.0f, 1.0f);
LLColor4 LLColor4::green2(0.0f, 0.6f, 0.0f, 1.0f);
LLColor4 LLColor4::green3(0.0f, 0.4f, 0.0f, 1.0f);
LLColor4 LLColor4::green4(0.0f, 1.0f, 0.4f, 1.0f);
LLColor4 LLColor4::green5(0.2f, 0.6f, 0.4f, 1.0f);
LLColor4 LLColor4::green6(0.4f, 0.6f, 0.2f, 1.0f);

LLColor4 LLColor4::blue1(0.0f, 0.0f, 1.0f, 1.0f);
LLColor4 LLColor4::blue2(0.0f, 0.4f, 1.0f, 1.0f);
LLColor4 LLColor4::blue3(0.2f, 0.2f, 0.8f, 1.0f);
LLColor4 LLColor4::blue4(0.0f, 0.0f, 0.6f, 1.0f);
LLColor4 LLColor4::blue5(0.4f, 0.2f, 1.0f, 1.0f);
LLColor4 LLColor4::blue6(0.4f, 0.5f, 1.0f, 1.0f);

LLColor4 LLColor4::yellow1(1.0f, 1.0f, 0.0f, 1.0f);
LLColor4 LLColor4::yellow2(0.6f, 0.6f, 0.0f, 1.0f);
LLColor4 LLColor4::yellow3(0.8f, 1.0f, 0.2f, 1.0f);
LLColor4 LLColor4::yellow4(1.0f, 1.0f, 0.4f, 1.0f);
LLColor4 LLColor4::yellow5(0.6f, 0.4f, 0.2f, 1.0f);
LLColor4 LLColor4::yellow6(1.0f, 0.8f, 0.4f, 1.0f);
LLColor4 LLColor4::yellow7(0.8f, 0.8f, 0.0f, 1.0f);
LLColor4 LLColor4::yellow8(0.8f, 0.8f, 0.2f, 1.0f);
LLColor4 LLColor4::yellow9(0.8f, 0.8f, 0.4f, 1.0f);

LLColor4 LLColor4::orange1(1.0f, 0.8f, 0.0f, 1.0f);
LLColor4 LLColor4::orange2(1.0f, 0.6f, 0.0f, 1.0f);
LLColor4 LLColor4::orange3(1.0f, 0.4f, 0.2f, 1.0f);
LLColor4 LLColor4::orange4(0.8f, 0.4f, 0.0f, 1.0f);
LLColor4 LLColor4::orange5(0.9f, 0.5f, 0.0f, 1.0f);
LLColor4 LLColor4::orange6(1.0f, 0.8f, 0.2f, 1.0f);

LLColor4 LLColor4::magenta1(1.0f, 0.0f, 1.0f, 1.0f);
LLColor4 LLColor4::magenta2(0.6f, 0.2f, 0.4f, 1.0f);
LLColor4 LLColor4::magenta3(1.0f, 0.4f, 0.6f, 1.0f);
LLColor4 LLColor4::magenta4(1.0f, 0.2f, 0.8f, 1.0f);

LLColor4 LLColor4::purple1(0.6f, 0.2f, 0.8f, 1.0f);
LLColor4 LLColor4::purple2(0.8f, 0.2f, 1.0f, 1.0f);
LLColor4 LLColor4::purple3(0.6f, 0.0f, 1.0f, 1.0f);
LLColor4 LLColor4::purple4(0.4f, 0.0f, 0.8f, 1.0f);
LLColor4 LLColor4::purple5(0.6f, 0.0f, 0.8f, 1.0f);
LLColor4 LLColor4::purple6(0.8f, 0.0f, 0.6f, 1.0f);

LLColor4 LLColor4::pink1(1.0f, 0.5f, 0.8f, 1.0f);
LLColor4 LLColor4::pink2(1.0f, 0.8f, 0.9f, 1.0f);

LLColor4 LLColor4::cyan1(0.0f, 1.0f, 1.0f, 1.0f);
LLColor4 LLColor4::cyan2(0.4f, 0.8f, 0.8f, 1.0f);
LLColor4 LLColor4::cyan3(0.0f, 1.0f, 0.6f, 1.0f);
LLColor4 LLColor4::cyan4(0.6f, 1.0f, 1.0f, 1.0f);
LLColor4 LLColor4::cyan5(0.2f, 0.6f, 1.0f, 1.0f);
LLColor4 LLColor4::cyan6(0.2f, 0.6f, 0.6f, 1.0f);

//////////////////////////////////////////////////////////////////////////////

// conversion
LLColor4::operator LLColor4U() const
{
    return LLColor4U(
        (U8)llclampb(ll_round(mV[VRED]*255.f)),
        (U8)llclampb(ll_round(mV[VGREEN]*255.f)),
        (U8)llclampb(ll_round(mV[VBLUE]*255.f)),
        (U8)llclampb(ll_round(mV[VALPHA]*255.f)));
}

LLColor4::LLColor4(const LLColor3 &vec, F32 a)
{
    mV[VRED] = vec.mV[VRED];
    mV[VGREEN] = vec.mV[VGREEN];
    mV[VBLUE] = vec.mV[VBLUE];
    mV[VALPHA] = a;
}

LLColor4::LLColor4(const LLColor4U& color4u)
{
    const F32 SCALE = 1.f/255.f;
    mV[VRED] = color4u.mV[VRED] * SCALE;
    mV[VGREEN] = color4u.mV[VGREEN] * SCALE;
    mV[VBLUE] = color4u.mV[VBLUE] * SCALE;
    mV[VALPHA] = color4u.mV[VALPHA] * SCALE;
}

LLColor4::LLColor4(const LLVector4& vector4)
{
    mV[VRED] = vector4.mV[VRED];
    mV[VGREEN] = vector4.mV[VGREEN];
    mV[VBLUE] = vector4.mV[VBLUE];
    mV[VALPHA] = vector4.mV[VALPHA];
}

const LLColor4& LLColor4::set(const LLColor4U& color4u)
{
    const F32 SCALE = 1.f/255.f;
    mV[VRED] = color4u.mV[VRED] * SCALE;
    mV[VGREEN] = color4u.mV[VGREEN] * SCALE;
    mV[VBLUE] = color4u.mV[VBLUE] * SCALE;
    mV[VALPHA] = color4u.mV[VALPHA] * SCALE;
    return (*this);
}

const LLColor4& LLColor4::set(const LLColor3 &vec)
{
    mV[VRED] = vec.mV[VRED];
    mV[VGREEN] = vec.mV[VGREEN];
    mV[VBLUE] = vec.mV[VBLUE];

//  no change to alpha!
//  mV[VALPHA] = 1.f;

    return (*this);
}

const LLColor4& LLColor4::set(const LLColor3 &vec, F32 a)
{
    mV[VRED] = vec.mV[VRED];
    mV[VGREEN] = vec.mV[VGREEN];
    mV[VBLUE] = vec.mV[VBLUE];
    mV[VALPHA] = a;
    return (*this);
}

// deprecated -- use set()
const LLColor4& LLColor4::setVec(const LLColor4U& color4u)
{
    const F32 SCALE = 1.f/255.f;
    mV[VRED] = color4u.mV[VRED] * SCALE;
    mV[VGREEN] = color4u.mV[VGREEN] * SCALE;
    mV[VBLUE] = color4u.mV[VBLUE] * SCALE;
    mV[VALPHA] = color4u.mV[VALPHA] * SCALE;
    return (*this);
}

// deprecated -- use set()
const LLColor4& LLColor4::setVec(const LLColor3 &vec)
{
    mV[VRED] = vec.mV[VRED];
    mV[VGREEN] = vec.mV[VGREEN];
    mV[VBLUE] = vec.mV[VBLUE];

//  no change to alpha!
//  mV[VALPHA] = 1.f;

    return (*this);
}

// deprecated -- use set()
const LLColor4& LLColor4::setVec(const LLColor3 &vec, F32 a)
{
    mV[VRED] = vec.mV[VRED];
    mV[VGREEN] = vec.mV[VGREEN];
    mV[VBLUE] = vec.mV[VBLUE];
    mV[VALPHA] = a;
    return (*this);
}

void LLColor4::setValue(const LLSD& sd)
{
#if 0
    // Clamping on setValue from LLSD is inconsistent with other set behavior
    F32 val;
    bool out_of_range = false;
    val = sd[0].asReal();
    mV[0] = llclamp(val, 0.f, 1.f);
    out_of_range = mV[0] != val;

    val = sd[1].asReal();
    mV[1] = llclamp(val, 0.f, 1.f);
    out_of_range |= mV[1] != val;

    val = sd[2].asReal();
    mV[2] = llclamp(val, 0.f, 1.f);
    out_of_range |= mV[2] != val;

    val = sd[3].asReal();
    mV[3] = llclamp(val, 0.f, 1.f);
    out_of_range |= mV[3] != val;

    if (out_of_range)
    {
        LL_WARNS() << "LLSD color value out of range!" << LL_ENDL;
    }
#else
    mV[0] = (F32) sd[0].asReal();
    mV[1] = (F32) sd[1].asReal();
    mV[2] = (F32) sd[2].asReal();
    mV[3] = (F32) sd[3].asReal();
#endif
}

const LLColor4& LLColor4::operator=(const LLColor3 &a)
{
    mV[VRED] = a.mV[VRED];
    mV[VGREEN] = a.mV[VGREEN];
    mV[VBLUE] = a.mV[VBLUE];

// converting from an rgb sets a=1 (opaque)
    mV[VALPHA] = 1.f;
    return (*this);
}


std::ostream& operator<<(std::ostream& s, const LLColor4 &a)
{
    s << "{ " << a.mV[VRED] << ", " << a.mV[VGREEN] << ", " << a.mV[VBLUE] << ", " << a.mV[VALPHA] << " }";
    return s;
}

bool operator==(const LLColor4 &a, const LLColor3 &b)
{
    return (  (a.mV[VRED] == b.mV[VRED])
            &&(a.mV[VGREEN] == b.mV[VGREEN])
            &&(a.mV[VBLUE] == b.mV[VBLUE]));
}

bool operator!=(const LLColor4 &a, const LLColor3 &b)
{
    return (  (a.mV[VRED] != b.mV[VRED])
            ||(a.mV[VGREEN] != b.mV[VGREEN])
            ||(a.mV[VBLUE] != b.mV[VBLUE]));
}

LLColor3    vec4to3(const LLColor4 &vec)
{
    LLColor3    temp(vec.mV[VRED], vec.mV[VGREEN], vec.mV[VBLUE]);
    return temp;
}

LLColor4    vec3to4(const LLColor3 &vec)
{
    LLColor3    temp(vec.mV[VRED], vec.mV[VGREEN], vec.mV[VBLUE]);
    return temp;
}

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 LLColor4::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 LLColor4::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;
}

// static
bool LLColor4::parseColor(const std::string& buf, LLColor4* color)
{
    if( buf.empty() || color == nullptr)
    {
        return false;
    }

    boost_tokenizer tokens(buf, boost::char_separator<char>(", "));
    boost_tokenizer::iterator token_iter = tokens.begin();
    if (token_iter == tokens.end())
    {
        return false;
    }

    // Grab the first token into a string, since we don't know
    // if this is a float or a color name.
    std::string color_name( (*token_iter) );
    ++token_iter;

    if (token_iter != tokens.end())
    {
        // There are more tokens to read.  This must be a vector.
        LLColor4 v;
        LLStringUtil::convertToF32( color_name,  v.mV[VRED] );
        LLStringUtil::convertToF32( *token_iter, v.mV[VGREEN] );
        v.mV[VBLUE] = 0.0f;
        v.mV[VALPHA] = 1.0f;

        ++token_iter;
        if (token_iter == tokens.end())
        {
            // This is a malformed vector.
            LL_WARNS() << "LLColor4::parseColor() malformed color " << buf << LL_ENDL;
        }
        else
        {
            // There is a z-component.
            LLStringUtil::convertToF32( *token_iter, v.mV[VBLUE] );

            ++token_iter;
            if (token_iter != tokens.end())
            {
                // There is an alpha component.
                LLStringUtil::convertToF32( *token_iter, v.mV[VALPHA] );
            }
        }

        //  Make sure all values are between 0 and 1.
        if (v.mV[VRED] > 1.f || v.mV[VGREEN] > 1.f || v.mV[VBLUE] > 1.f || v.mV[VALPHA] > 1.f)
        {
            v = v * (1.f / 255.f);
        }
        color->set( v );
    }
    else // Single value.  Read as a named color.
    {
        // We have a color name
        if ( "red" == color_name )
        {
            color->set(LLColor4::red);
        }
        else if ( "red1" == color_name )
        {
            color->set(LLColor4::red1);
        }
        else if ( "red2" == color_name )
        {
            color->set(LLColor4::red2);
        }
        else if ( "red3" == color_name )
        {
            color->set(LLColor4::red3);
        }
        else if ( "red4" == color_name )
        {
            color->set(LLColor4::red4);
        }
        else if ( "red5" == color_name )
        {
            color->set(LLColor4::red5);
        }
        else if( "green" == color_name )
        {
            color->set(LLColor4::green);
        }
        else if( "green1" == color_name )
        {
            color->set(LLColor4::green1);
        }
        else if( "green2" == color_name )
        {
            color->set(LLColor4::green2);
        }
        else if( "green3" == color_name )
        {
            color->set(LLColor4::green3);
        }
        else if( "green4" == color_name )
        {
            color->set(LLColor4::green4);
        }
        else if( "green5" == color_name )
        {
            color->set(LLColor4::green5);
        }
        else if( "green6" == color_name )
        {
            color->set(LLColor4::green6);
        }
        else if( "blue" == color_name )
        {
            color->set(LLColor4::blue);
        }
        else if( "blue1" == color_name )
        {
            color->set(LLColor4::blue1);
        }
        else if( "blue2" == color_name )
        {
            color->set(LLColor4::blue2);
        }
        else if( "blue3" == color_name )
        {
            color->set(LLColor4::blue3);
        }
        else if( "blue4" == color_name )
        {
            color->set(LLColor4::blue4);
        }
        else if( "blue5" == color_name )
        {
            color->set(LLColor4::blue5);
        }
        else if( "blue6" == color_name )
        {
            color->set(LLColor4::blue6);
        }
        else if( "black" == color_name )
        {
            color->set(LLColor4::black);
        }
        else if( "white" == color_name )
        {
            color->set(LLColor4::white);
        }
        else if( "yellow" == color_name )
        {
            color->set(LLColor4::yellow);
        }
        else if( "yellow1" == color_name )
        {
            color->set(LLColor4::yellow1);
        }
        else if( "yellow2" == color_name )
        {
            color->set(LLColor4::yellow2);
        }
        else if( "yellow3" == color_name )
        {
            color->set(LLColor4::yellow3);
        }
        else if( "yellow4" == color_name )
        {
            color->set(LLColor4::yellow4);
        }
        else if( "yellow5" == color_name )
        {
            color->set(LLColor4::yellow5);
        }
        else if( "yellow6" == color_name )
        {
            color->set(LLColor4::yellow6);
        }
        else if( "magenta" == color_name )
        {
            color->set(LLColor4::magenta);
        }
        else if( "magenta1" == color_name )
        {
            color->set(LLColor4::magenta1);
        }
        else if( "magenta2" == color_name )
        {
            color->set(LLColor4::magenta2);
        }
        else if( "magenta3" == color_name )
        {
            color->set(LLColor4::magenta3);
        }
        else if( "magenta4" == color_name )
        {
            color->set(LLColor4::magenta4);
        }
        else if( "purple" == color_name )
        {
            color->set(LLColor4::purple);
        }
        else if( "purple1" == color_name )
        {
            color->set(LLColor4::purple1);
        }
        else if( "purple2" == color_name )
        {
            color->set(LLColor4::purple2);
        }
        else if( "purple3" == color_name )
        {
            color->set(LLColor4::purple3);
        }
        else if( "purple4" == color_name )
        {
            color->set(LLColor4::purple4);
        }
        else if( "purple5" == color_name )
        {
            color->set(LLColor4::purple5);
        }
        else if( "purple6" == color_name )
        {
            color->set(LLColor4::purple6);
        }
        else if( "pink" == color_name )
        {
            color->set(LLColor4::pink);
        }
        else if( "pink1" == color_name )
        {
            color->set(LLColor4::pink1);
        }
        else if( "pink2" == color_name )
        {
            color->set(LLColor4::pink2);
        }
        else if( "cyan" == color_name )
        {
            color->set(LLColor4::cyan);
        }
        else if( "cyan1" == color_name )
        {
            color->set(LLColor4::cyan1);
        }
        else if( "cyan2" == color_name )
        {
            color->set(LLColor4::cyan2);
        }
        else if( "cyan3" == color_name )
        {
            color->set(LLColor4::cyan3);
        }
        else if( "cyan4" == color_name )
        {
            color->set(LLColor4::cyan4);
        }
        else if( "cyan5" == color_name )
        {
            color->set(LLColor4::cyan5);
        }
        else if( "cyan6" == color_name )
        {
            color->set(LLColor4::cyan6);
        }
        else if( "smoke" == color_name )
        {
            color->set(LLColor4::smoke);
        }
        else if( "grey" == color_name )
        {
            color->set(LLColor4::grey);
        }
        else if( "grey1" == color_name )
        {
            color->set(LLColor4::grey1);
        }
        else if( "grey2" == color_name )
        {
            color->set(LLColor4::grey2);
        }
        else if( "grey3" == color_name )
        {
            color->set(LLColor4::grey3);
        }
        else if( "grey4" == color_name )
        {
            color->set(LLColor4::grey4);
        }
        else if( "orange" == color_name )
        {
            color->set(LLColor4::orange);
        }
        else if( "orange1" == color_name )
        {
            color->set(LLColor4::orange1);
        }
        else if( "orange2" == color_name )
        {
            color->set(LLColor4::orange2);
        }
        else if( "orange3" == color_name )
        {
            color->set(LLColor4::orange3);
        }
        else if( "orange4" == color_name )
        {
            color->set(LLColor4::orange4);
        }
        else if( "orange5" == color_name )
        {
            color->set(LLColor4::orange5);
        }
        else if( "orange6" == color_name )
        {
            color->set(LLColor4::orange6);
        }
        else if ( "clear" == color_name )
        {
            color->set(0.f, 0.f, 0.f, 0.f);
        }
        else
        {
            LL_WARNS() << "invalid color " << color_name << LL_ENDL;
        }
    }

    return true;
}

// static
bool LLColor4::parseColor4(const std::string& buf, LLColor4* value)
{
    if( buf.empty() || value == nullptr)
    {
        return false;
    }

    LLColor4 v;
    S32 count = sscanf( buf.c_str(), "%f, %f, %f, %f", v.mV + 0, v.mV + 1, v.mV + 2, v.mV + 3 );
    if (1 == count )
    {
        // try this format
        count = sscanf( buf.c_str(), "%f %f %f %f", v.mV + 0, v.mV + 1, v.mV + 2, v.mV + 3 );
    }
    if( 4 == count )
    {
        value->setVec( v );
        return true;
    }

    return false;
}

// EOF