v3color.h

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#ifndef LL_V3COLOR_H
#define LL_V3COLOR_H

class LLColor4;

#include "llerror.h"
#include "llmath.h"
#include "llsd.h"

//  LLColor3 = |r g b|

static const U32 LENGTHOFCOLOR3 = 3;

class LLColor3
{
public:
        F32 mV[LENGTHOFCOLOR3];

        static LLColor3 white;
        static LLColor3 black;
        static LLColor3 grey;

public:
        LLColor3();                                                     // Initializes LLColor3 to (0, 0, 0)
        LLColor3(F32 r, F32 g, F32 b);          // Initializes LLColor3 to (r, g, b)
        LLColor3(const F32 *vec);                       // Initializes LLColor3 to (vec[0]. vec[1], vec[2])
        LLColor3(char *color_string);       // html format color ie "#FFDDEE"
        explicit LLColor3(const LLColor4& color4);  // "explicit" to avoid automatic conversion
        LLColor3(const LLSD& sd);
        

        LLSD getValue() const
        {
                LLSD ret;
                ret[0] = mV[0];
                ret[1] = mV[1];
                ret[2] = mV[2];
                return ret;
        }

        void setValue(const LLSD& sd)
        {
                mV[0] = (F32) sd[0].asReal();;
                mV[1] = (F32) sd[1].asReal();;
                mV[2] = (F32) sd[2].asReal();;
        }

        void calcHSL(F32* hue, F32* saturation, F32* luminance) const;
        
        const LLColor3& setToBlack();                                   // Clears LLColor3 to (0, 0, 0)
        const LLColor3& setToWhite();                                   // Zero LLColor3 to (0, 0, 0)
        const LLColor3& setVec(F32 x, F32 y, F32 z);    // Sets LLColor3 to (x, y, z)
        const LLColor3& setVec(const LLColor3 &vec);    // Sets LLColor3 to vec
        const LLColor3& setVec(const F32 *vec);                 // Sets LLColor3 to vec

        F32             magVec() const;                         // Returns magnitude of LLColor3
        F32             magVecSquared() const;          // Returns magnitude squared of LLColor3
        F32             normVec();                                      // Normalizes and returns the magnitude of LLColor3

        const LLColor3& operator=(const LLColor4 &a);
        
        friend std::ostream&     operator<<(std::ostream& s, const LLColor3 &a);                // Print a
        friend LLColor3 operator+(const LLColor3 &a, const LLColor3 &b);        // Return vector a + b
        friend LLColor3 operator-(const LLColor3 &a, const LLColor3 &b);        // Return vector a minus b

        friend const LLColor3& operator+=(LLColor3 &a, const LLColor3 &b);      // Return vector a + b
        friend const LLColor3& operator-=(LLColor3 &a, const LLColor3 &b);      // Return vector a minus b
        friend const LLColor3& operator*=(LLColor3 &a, const LLColor3 &b);

        friend LLColor3 operator*(const LLColor3 &a, const LLColor3 &b);                // Return a dot b
        friend LLColor3 operator*(const LLColor3 &a, F32 k);                            // Return a times scaler k
        friend LLColor3 operator*(F32 k, const LLColor3 &a);                            // Return a times scaler k

        friend bool operator==(const LLColor3 &a, const LLColor3 &b);           // Return a == b
        friend bool operator!=(const LLColor3 &a, const LLColor3 &b);           // Return a != b

        friend const LLColor3& operator*=(LLColor3 &a, F32 k);                          // Return a times scaler k

        friend LLColor3 operator-(const LLColor3 &a);                                   // Return vector 1-rgb (inverse)

        inline void clamp();
        inline void exp();      // Do an exponential on the color
};

LLColor3 lerp(const LLColor3 &a, const LLColor3 &b, F32 u);


void LLColor3::clamp()
{
        // Clamp the color...
        if (mV[0] < 0.f)
        {
                mV[0] = 0.f;
        }
        else if (mV[0] > 1.f)
        {
                mV[0] = 1.f;
        }
        if (mV[1] < 0.f)
        {
                mV[1] = 0.f;
        }
        else if (mV[1] > 1.f)
        {
                mV[1] = 1.f;
        }
        if (mV[2] < 0.f)
        {
                mV[2] = 0.f;
        }
        else if (mV[2] > 1.f)
        {
                mV[2] = 1.f;
        }
}

// Non-member functions 
F32             distVec(const LLColor3 &a, const LLColor3 &b);          // Returns distance between a and b
F32             distVec_squared(const LLColor3 &a, const LLColor3 &b);// Returns distance sqaured between a and b

inline LLColor3::LLColor3(void)
{
        mV[0] = 0.f;
        mV[1] = 0.f;
        mV[2] = 0.f;
}

inline LLColor3::LLColor3(F32 r, F32 g, F32 b)
{
        mV[VX] = r;
        mV[VY] = g;
        mV[VZ] = b;
}

inline LLColor3::LLColor3(const F32 *vec)
{
        mV[VX] = vec[VX];
        mV[VY] = vec[VY];
        mV[VZ] = vec[VZ];
}

inline LLColor3::LLColor3(char* color_string) // takes a string of format "RRGGBB" where RR is hex 00..FF 
{
        if (strlen(color_string) <  6)          /* Flawfinder: ignore */
        {
                mV[0] = 0.f;
                mV[1] = 0.f;
                mV[2] = 0.f;            
                return;
        }

        static char tempstr[7];         /* Flawfinder: ignore */
        strncpy(tempstr,color_string,6);                /* Flawfinder: ignore */
        tempstr[6] = '\0';
        mV[VZ] = (F32)strtol(&tempstr[4],NULL,16)/255.f;
        tempstr[4] = '\0';
        mV[VY] = (F32)strtol(&tempstr[2],NULL,16)/255.f;
        tempstr[2] = '\0';
        mV[VX] = (F32)strtol(&tempstr[0],NULL,16)/255.f;
}

inline const LLColor3&  LLColor3::setToBlack(void)
{
        mV[0] = 0.f;
        mV[1] = 0.f;
        mV[2] = 0.f;
        return (*this);
}

inline const LLColor3&  LLColor3::setToWhite(void)
{
        mV[0] = 1.f;
        mV[1] = 1.f;
        mV[2] = 1.f;
        return (*this);
}

inline const LLColor3&  LLColor3::setVec(F32 r, F32 g, F32 b)
{
        mV[0] = r;
        mV[1] = g;
        mV[2] = b;
        return (*this);
}

inline const LLColor3&  LLColor3::setVec(const LLColor3 &vec)
{
        mV[0] = vec.mV[0];
        mV[1] = vec.mV[1];
        mV[2] = vec.mV[2];
        return (*this);
}

inline const LLColor3&  LLColor3::setVec(const F32 *vec)
{
        mV[0] = vec[0];
        mV[1] = vec[1];
        mV[2] = vec[2];
        return (*this);
}

inline F32              LLColor3::magVec(void) const
{
        return fsqrtf(mV[0]*mV[0] + mV[1]*mV[1] + mV[2]*mV[2]);
}

inline F32              LLColor3::magVecSquared(void) const
{
        return mV[0]*mV[0] + mV[1]*mV[1] + mV[2]*mV[2];
}

inline F32              LLColor3::normVec(void)
{
        F32 mag = fsqrtf(mV[0]*mV[0] + mV[1]*mV[1] + mV[2]*mV[2]);
        F32 oomag;

        if (mag)
        {
                oomag = 1.f/mag;
                mV[0] *= oomag;
                mV[1] *= oomag;
                mV[2] *= oomag;
        }
        return (mag);
}

inline void LLColor3::exp()
{
#if 0
        mV[0] = ::exp(mV[0]);
        mV[1] = ::exp(mV[1]);
        mV[2] = ::exp(mV[2]);
#else
        mV[0] = (F32)LL_FAST_EXP(mV[0]);
        mV[1] = (F32)LL_FAST_EXP(mV[1]);
        mV[2] = (F32)LL_FAST_EXP(mV[2]);
#endif
}


inline LLColor3 operator+(const LLColor3 &a, const LLColor3 &b)
{
        return LLColor3(
                a.mV[0] + b.mV[0],
                a.mV[1] + b.mV[1],
                a.mV[2] + b.mV[2]);
}

inline LLColor3 operator-(const LLColor3 &a, const LLColor3 &b)
{
        return LLColor3(
                a.mV[0] - b.mV[0],
                a.mV[1] - b.mV[1],
                a.mV[2] - b.mV[2]);
}

inline LLColor3  operator*(const LLColor3 &a, const LLColor3 &b)
{
        return LLColor3(
                a.mV[0] * b.mV[0],
                a.mV[1] * b.mV[1],
                a.mV[2] * b.mV[2]);
}

inline LLColor3 operator*(const LLColor3 &a, F32 k)
{
        return LLColor3( a.mV[0] * k, a.mV[1] * k, a.mV[2] * k );
}

inline LLColor3 operator*(F32 k, const LLColor3 &a)
{
        return LLColor3( a.mV[0] * k, a.mV[1] * k, a.mV[2] * k );
}

inline bool operator==(const LLColor3 &a, const LLColor3 &b)
{
        return (  (a.mV[0] == b.mV[0])
                        &&(a.mV[1] == b.mV[1])
                        &&(a.mV[2] == b.mV[2]));
}

inline bool operator!=(const LLColor3 &a, const LLColor3 &b)
{
        return (  (a.mV[0] != b.mV[0])
                        ||(a.mV[1] != b.mV[1])
                        ||(a.mV[2] != b.mV[2]));
}

inline const LLColor3 &operator*=(LLColor3 &a, const LLColor3 &b)
{
        a.mV[0] *= b.mV[0];
        a.mV[1] *= b.mV[1];
        a.mV[2] *= b.mV[2];
        return a;
}

inline const LLColor3& operator+=(LLColor3 &a, const LLColor3 &b)
{
        a.mV[0] += b.mV[0];
        a.mV[1] += b.mV[1];
        a.mV[2] += b.mV[2];
        return a;
}

inline const LLColor3& operator-=(LLColor3 &a, const LLColor3 &b)
{
        a.mV[0] -= b.mV[0];
        a.mV[1] -= b.mV[1];
        a.mV[2] -= b.mV[2];
        return a;
}

inline const LLColor3& operator*=(LLColor3 &a, F32 k)
{
        a.mV[0] *= k;
        a.mV[1] *= k;
        a.mV[2] *= k;
        return a;
}

inline LLColor3 operator-(const LLColor3 &a)
{
        return LLColor3(
                1.f - a.mV[0],
                1.f - a.mV[1],
                1.f - a.mV[2] );
}

// Non-member functions

inline F32              distVec(const LLColor3 &a, const LLColor3 &b)
{
        F32 x = a.mV[0] - b.mV[0];
        F32 y = a.mV[1] - b.mV[1];
        F32 z = a.mV[2] - b.mV[2];
        return fsqrtf( x*x + y*y + z*z );
}

inline F32              distVec_squared(const LLColor3 &a, const LLColor3 &b)
{
        F32 x = a.mV[0] - b.mV[0];
        F32 y = a.mV[1] - b.mV[1];
        F32 z = a.mV[2] - b.mV[2];
        return x*x + y*y + z*z;
}

inline LLColor3 lerp(const LLColor3 &a, const LLColor3 &b, F32 u)
{
        return LLColor3(
                a.mV[VX] + (b.mV[VX] - a.mV[VX]) * u,
                a.mV[VY] + (b.mV[VY] - a.mV[VY]) * u,
                a.mV[VZ] + (b.mV[VZ] - a.mV[VZ]) * u);
}


#endif

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