OgreColourValue.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2011 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef _COLOURVALUE_H__
#define _COLOURVALUE_H__

#include "OgrePrerequisites.h"

namespace Ogre {
    typedef uint32 RGBA;
    typedef uint32 ARGB;
    typedef uint32 ABGR;
    typedef uint32 BGRA;

    class _OgreExport ColourValue
    {
    public:
        static const ColourValue ZERO;
        static const ColourValue Black;
        static const ColourValue White;
        static const ColourValue Red;
        static const ColourValue Green;
        static const ColourValue Blue;

        explicit ColourValue( float red = 1.0f,
                    float green = 1.0f,
                    float blue = 1.0f,
                    float alpha = 1.0f ) : r(red), g(green), b(blue), a(alpha)
        { }

        bool operator==(const ColourValue& rhs) const;
        bool operator!=(const ColourValue& rhs) const;

        float r,g,b,a;

        RGBA getAsRGBA(void) const;

        ARGB getAsARGB(void) const;

        BGRA getAsBGRA(void) const;

        ABGR getAsABGR(void) const;

        void setAsRGBA(const RGBA val);

        void setAsARGB(const ARGB val);

        void setAsBGRA(const BGRA val);

        void setAsABGR(const ABGR val);

        void saturate(void)
        {
            if (r < 0)
                r = 0;
            else if (r > 1)
                r = 1;

            if (g < 0)
                g = 0;
            else if (g > 1)
                g = 1;

            if (b < 0)
                b = 0;
            else if (b > 1)
                b = 1;

            if (a < 0)
                a = 0;
            else if (a > 1)
                a = 1;
        }

        ColourValue saturateCopy(void) const
        {
            ColourValue ret = *this;
            ret.saturate();
            return ret;
        }

        inline float operator [] ( const size_t i ) const
        {
            assert( i < 4 );

            return *(&r+i);
        }

        inline float& operator [] ( const size_t i )
        {
            assert( i < 4 );

            return *(&r+i);
        }

        inline float* ptr()
        {
            return &r;
        }
        inline const float* ptr() const
        {
            return &r;
        }

        
        // arithmetic operations
        inline ColourValue operator + ( const ColourValue& rkVector ) const
        {
            ColourValue kSum;

            kSum.r = r + rkVector.r;
            kSum.g = g + rkVector.g;
            kSum.b = b + rkVector.b;
            kSum.a = a + rkVector.a;

            return kSum;
        }

        inline ColourValue operator - ( const ColourValue& rkVector ) const
        {
            ColourValue kDiff;

            kDiff.r = r - rkVector.r;
            kDiff.g = g - rkVector.g;
            kDiff.b = b - rkVector.b;
            kDiff.a = a - rkVector.a;

            return kDiff;
        }

        inline ColourValue operator * (const float fScalar ) const
        {
            ColourValue kProd;

            kProd.r = fScalar*r;
            kProd.g = fScalar*g;
            kProd.b = fScalar*b;
            kProd.a = fScalar*a;

            return kProd;
        }

        inline ColourValue operator * ( const ColourValue& rhs) const
        {
            ColourValue kProd;

            kProd.r = rhs.r * r;
            kProd.g = rhs.g * g;
            kProd.b = rhs.b * b;
            kProd.a = rhs.a * a;

            return kProd;
        }

        inline ColourValue operator / ( const ColourValue& rhs) const
        {
            ColourValue kProd;

            kProd.r = rhs.r / r;
            kProd.g = rhs.g / g;
            kProd.b = rhs.b / b;
            kProd.a = rhs.a / a;

            return kProd;
        }

        inline ColourValue operator / (const float fScalar ) const
        {
            assert( fScalar != 0.0 );

            ColourValue kDiv;

            float fInv = 1.0f / fScalar;
            kDiv.r = r * fInv;
            kDiv.g = g * fInv;
            kDiv.b = b * fInv;
            kDiv.a = a * fInv;

            return kDiv;
        }

        inline friend ColourValue operator * (const float fScalar, const ColourValue& rkVector )
        {
            ColourValue kProd;

            kProd.r = fScalar * rkVector.r;
            kProd.g = fScalar * rkVector.g;
            kProd.b = fScalar * rkVector.b;
            kProd.a = fScalar * rkVector.a;

            return kProd;
        }

        // arithmetic updates
        inline ColourValue& operator += ( const ColourValue& rkVector )
        {
            r += rkVector.r;
            g += rkVector.g;
            b += rkVector.b;
            a += rkVector.a;

            return *this;
        }

        inline ColourValue& operator -= ( const ColourValue& rkVector )
        {
            r -= rkVector.r;
            g -= rkVector.g;
            b -= rkVector.b;
            a -= rkVector.a;

            return *this;
        }

        inline ColourValue& operator *= (const float fScalar )
        {
            r *= fScalar;
            g *= fScalar;
            b *= fScalar;
            a *= fScalar;
            return *this;
        }

        inline ColourValue& operator /= (const float fScalar )
        {
            assert( fScalar != 0.0 );

            float fInv = 1.0f / fScalar;

            r *= fInv;
            g *= fInv;
            b *= fInv;
            a *= fInv;

            return *this;
        }

        void setHSB(Real hue, Real saturation, Real brightness);

        void getHSB(Real* hue, Real* saturation, Real* brightness) const;



        inline _OgreExport friend std::ostream& operator <<
            ( std::ostream& o, const ColourValue& c )
        {
            o << "ColourValue(" << c.r << ", " << c.g << ", " << c.b << ", " << c.a << ")";
            return o;
        }

    };
} // namespace

#endif