blurmodifier.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
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
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 */
#ifndef _graphicsproceduralblurmodifier_cpp
#define _graphicsproceduralblurmodifier_cpp

#include "Graphics/Procedural/Texture/blurmodifier.h"
#include "Graphics/Procedural/Texture/convolutionmodifier.h"

#include "MathTools/mathtools.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            BlurModifier::BlurModifier() :
                Type(BT_Box),
                BlurBlockSize(5),
                BlurSigma(92)
                {  }

            BlurModifier::~BlurModifier()
                {  }

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

            void BlurModifier::Modify(TextureBuffer& Buffer)
            {
                ConvolutionModifier Filter;
                switch( this->Type )
                {
                    default:
                    case BT_Box:
                    {
                        Real BlurKernel[25] = { 1, 2, 3, 2, 1, 2, 4, 5, 4, 2, 3, 5, 6, 5, 3, 2, 4, 5, 4, 2, 1, 2, 3, 2, 1 };
                        Filter.SetKernel(5,BlurKernel);
                        break;
                    }
                    case BT_Mean:
                    {
                        Filter.SetKernel( Matrix3x3(1.0f,1.0f,1.0f,1.0f,1.0f,1.0f,1.0f,1.0f,1.0f) ).CalculateDivisor();
                        break;
                    }
                    case BT_Gaussian:
                    {
                        Real fSigma = 0.5 + ( (3.0 - 0.5 ) / 255.0 ) * (Real)this->BlurSigma;
                        Integer Radius = static_cast<Integer>( this->BlurBlockSize / 2 );
                        Real Min = MathTools::Exp( static_cast<Real>( 2 * Radius * Radius ) / ( -2.0 * fSigma * fSigma ) ) / ( MathTools::GetTwoPi() * fSigma * fSigma );
                        Integer* Kernel = new Integer[this->BlurBlockSize * this->BlurBlockSize];
                        Integer Divisor = 0;
                        Integer Y = -Radius;
                        Integer X = -Radius;
                        for( Integer i = 0 ; i < this->BlurBlockSize ; ++i )
                        {
                            for( Integer j = 0 ; j < this->BlurBlockSize ; ++j )
                            {
                                Kernel[i * this->BlurBlockSize + j] = static_cast<Integer>( ( MathTools::Exp( (Real)( X * X + Y * Y ) / ( -2.0 * fSigma * fSigma ) ) / ( MathTools::GetTwoPi() * fSigma * fSigma ) ) / Min );
                                Divisor += Kernel[i * this->BlurBlockSize + j];
                                ++X;
                            }
                            ++Y;
                        }
                        Filter.SetKernel(this->BlurBlockSize,Kernel).SetDivisor( static_cast<Real>(Divisor) );
                        delete[] Kernel;
                        break;
                    }
                }
                Filter.SetIncludeAlphaChannel(true).Modify(Buffer);
            }

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

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

            BlurModifier& BlurModifier::SetBlurType(const BlurType Blur)
            {
                this->Type = Blur;
                return *this;
            }

            BlurModifier& BlurModifier::SetBlockSize(const UInt8 Size)
            {
                this->BlurBlockSize = Size;
                return *this;
            }

            BlurModifier& BlurModifier::SetSigma(const UInt8 Sigma)
            {
                this->BlurSigma = Sigma;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif