coloursmodifier.cpp

// © Copyright 2010 - 2016 BlackTopp Studios Inc.
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/*
 -----------------------------------------------------------------------------
 This source file is part of ogre-procedural

 For the latest info, see http://code.google.com/p/ogre-procedural/

 Copyright (c) 2010-2013 Michael Broutin

 Permission is hereby granted, free of charge, to any person obtaining a copy
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 */
#ifndef _graphicsproceduralcoloursmodifier_cpp
#define _graphicsproceduralcoloursmodifier_cpp

#include "Graphics/Procedural/Texture/coloursmodifier.h"

#include "MathTools/mathtools.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            ColoursModifier::ColoursModifier() :
                ColourBase(0.0,0.0,0.0,1.0),
                ColourPercent(1.0,1.0,1.0,1.0),
                ColourBrightness(127),
                ColourContrast(127),
                ColourSaturation(127),
                ColourAlpha(127)
                {  }

            ColoursModifier::~ColoursModifier()
                {  }

            ///////////////////////////////////////////////////////////////////////////////
            // Utility

            void ColoursModifier::Modify(TextureBuffer& Buffer)
            {
                Whole Width = Buffer.GetWidth();
                Whole Height = Buffer.GetHeight();
                Integer Brightness = ( ( static_cast<Integer>(this->ColourBrightness) ) * 2 ) - 256;
                Integer Contrast = static_cast<Integer>( this->ColourContrast );
                Real fConstrast = static_cast<Real>( this->ColourContrast ) / 128.0;
                fConstrast = fConstrast * fConstrast * fConstrast;
                Contrast = static_cast<Integer>( fConstrast * 256.0 );
                UInt8 MinAlpha = ( this->ColourAlpha > 127 ) ? static_cast<UInt8>( ( this->ColourAlpha - 127 ) * 2.0 - ( this->ColourAlpha - 127 ) / 128.0 ) : 0;
                UInt8 MaxAlpha = ( this->ColourAlpha < 127 ) ? static_cast<UInt8>( this->ColourAlpha * 2.0 + this->ColourAlpha / 127.0 ) : 255;
                Real AlphaMult = static_cast<Real>( MaxAlpha - MinAlpha ) / 255.0;

                for( Whole Y = 0 ; Y < Height ; ++Y )
                {
                    for( Whole X = 0 ; X < Width ; ++X )
                    {
                        Integer Red = static_cast<Integer>( this->ColourBase.RedChannel * 255.0 ) + ( ( static_cast<Integer>( Buffer.GetRedByte(X,Y) ) * static_cast<Integer>( this->ColourPercent.RedChannel * 255.0 ) ) >> 8 ) + Brightness;
                        Integer Green = static_cast<Integer>( this->ColourBase.GreenChannel * 255.0 ) + ( ( static_cast<Integer>( Buffer.GetGreenByte(X,Y) ) * static_cast<Integer>( this->ColourPercent.GreenChannel * 255.0 ) ) >> 8 ) + Brightness;
                        Integer Blue = static_cast<Integer>( this->ColourBase.BlueChannel * 255.0 ) + ( ( static_cast<Integer>( Buffer.GetBlueByte(X,Y) ) * static_cast<Integer>( this->ColourPercent.BlueChannel * 255.0 ) ) >> 8 ) + Brightness;

                        Integer Colour = static_cast<Integer>( ( ( Red - 127 ) * Contrast ) >> 8 ) + 127;
                        Red = (Colour < 0x00) ? 0x00 : (Colour > 0xff) ? 0xff : Colour;

                        Colour = static_cast<Integer>( ( ( Green - 127 ) * Contrast ) >> 8 ) + 127;
                        Green = (Colour < 0x00) ? 0x00 : (Colour > 0xff) ? 0xff : Colour;

                        Colour = static_cast<Integer>( ( ( Blue - 127 ) * Contrast ) >> 8 ) + 127;
                        Blue = (Colour < 0x00) ? 0x00 : (Colour > 0xff) ? 0xff : Colour;

                        if( this->ColourSaturation != 127 ) {
                            Integer Intensity = Red + Green + Blue;
                            Integer U = ( 3 * Red - Intensity ) * this->ColourSaturation / 127;
                            Integer V = ( 3 * Blue - Intensity ) * this->ColourSaturation / 127;
                            Red = ( U + Intensity ) / 3;
                            Green = ( Intensity - ( U + V ) ) / 3;
                            Blue = ( V + Intensity ) / 3;
                        }

                        Buffer.SetRedByte(X,Y,static_cast<UInt8>( MathTools::Clamp(Red,Integer(0),Integer(255)) ));
                        Buffer.SetGreenByte(X,Y,static_cast<UInt8>( MathTools::Clamp(Green,Integer(0),Integer(255)) ));
                        Buffer.SetBlueByte(X,Y,static_cast<UInt8>( MathTools::Clamp(Blue,Integer(0),Integer(255)) ));
                        Buffer.SetAlphaByte(X,Y,static_cast<UInt8>( MathTools::Clamp( ( static_cast<Real>( Buffer.GetAlphaByte(X,Y) ) * AlphaMult ) + static_cast<Real>( MinAlpha ),Real(0),Real(255)) ));
                    }
                }
            }

            String ColoursModifier::GetName() const
                { return "ColoursModifier"; }

            ///////////////////////////////////////////////////////////////////////////////
            // Configuration

            ColoursModifier& ColoursModifier::SetColourBase(const ColourValue& Colour)
            {
                this->ColourBase = Colour;
                return *this;
            }

            ColoursModifier& ColoursModifier::SetColourBase(const Real Red, const Real Green, const Real Blue, const Real Alpha)
            {
                this->ColourBase.SetValues(Red,Green,Blue,Alpha);
                return *this;
            }

            ColoursModifier& ColoursModifier::SetColourPercent(const ColourValue& Colour)
            {
                this->ColourPercent = Colour;
                return *this;
            }

            ColoursModifier& ColoursModifier::SetColourPercent(const Real Red, const Real Green, const Real Blue, const Real Alpha)
            {
                this->ColourPercent.SetValues(Red,Green,Blue,Alpha);
                return *this;
            }

            ColoursModifier& ColoursModifier::SetBrightness(const UInt8 Brightness)
            {
                this->ColourBrightness = Brightness;
                return *this;
            }

            ColoursModifier& ColoursModifier::SetContrast(const UInt8 Contrast)
            {
                this->ColourContrast = Contrast;
                return *this;
            }

            ColoursModifier& ColoursModifier::SetSaturation(const UInt8 Saturation)
            {
                this->ColourSaturation = Saturation;
                return *this;
            }

            ColoursModifier& ColoursModifier::SetAlpha(const UInt8 Alpha)
            {
                this->ColourAlpha = Alpha;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif