convolutionmodifier.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 _graphicsproceduralconvolutionmodifier_cpp
#define _graphicsproceduralconvolutionmodifier_cpp

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

#include <cstring>

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            ConvolutionModifier::ConvolutionModifier() :
                KernelData(NULL),
                Divisor(1.0),
                KernelSize(3),
                Threshold(128),
                CalculateEdgeDivisor(true),
                IncludeAlphaChannel(false)
            {
                Integer Mid = 2;
                if( ( this->KernelSize % 2 ) == 0 ) {
                    Mid = this->KernelSize / 2;
                }else{
                    Mid = ( ( this->KernelSize - 1 ) / 2 ) + 1;
                }
                Whole SquaredSize = this->KernelSize * this->KernelSize;
                this->KernelData = new Real[ SquaredSize ];
                memset(this->KernelData,0,SquaredSize * sizeof(Real));
                this->KernelData[ this->KernelSize * Mid + Mid ] = 1.0;
            }

            ConvolutionModifier::~ConvolutionModifier()
            {
                if( this->KernelData != NULL ) {
                    delete[] this->KernelData;
                }
            }

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

            void ConvolutionModifier::Modify(TextureBuffer& Buffer)
            {
                Whole TargetWidth = Buffer.GetWidth();
                Whole TargetHeight = Buffer.GetHeight();
                Integer Radius = static_cast<Integer>( this->KernelSize ) >> 1;
                TextureBuffer TempBuffer( Buffer );

                for( Whole Y = 0 ; Y < TargetHeight ; ++Y )
                {
                    for( Whole X = 0 ; X < TargetWidth ; ++X )
                    {
                        Integer Red = 0;
                        Integer Green = 0;
                        Integer Blue = 0;
                        Integer Alpha = 0;
                        Integer Div = 0;
                        Integer ProcessedKernelSize = 0;

                        for( UInt8 i = 0 ; i < this->KernelSize ; ++i )
                        {
                            Integer iRad = i - Radius;
                            Integer YPos = static_cast<Integer>(Y) + iRad;

                            if( YPos < 0 )
                                continue;
                            if( YPos >= static_cast<Integer>( TargetHeight ) )
                                break;

                            for( UInt8 j = 0 ; j < this->KernelSize ; ++j )
                            {
                                Integer jRad = j - Radius;
                                Integer XPos = static_cast<Integer>(X) + jRad;

                                if( XPos < 0 )
                                    continue;
                                if( XPos < static_cast<Integer>( TargetWidth ) ) {
                                    Real KernelVal = this->KernelData[ i * this->KernelSize + j ];
                                    ColourValue Pixel = Buffer.GetPixel(XPos,YPos);
                                    Div += static_cast<Integer>( KernelVal );
                                    KernelVal *= 255.0;
                                    Red += static_cast<Integer>( KernelVal * Pixel.RedChannel );
                                    Green += static_cast<Integer>( KernelVal * Pixel.GreenChannel );
                                    Blue += static_cast<Integer>( KernelVal * Pixel.BlueChannel );
                                    Alpha += static_cast<Integer>( KernelVal * Pixel.AlphaChannel );

                                    ProcessedKernelSize++;
                                }
                            }
                        }

                        if( ProcessedKernelSize == ( this->KernelSize * this->KernelSize ) ) {
                            Div = static_cast<Integer>( this->Divisor );
                        }else{
                            if( !this->CalculateEdgeDivisor ) {
                                Div = static_cast<Integer>( this->Divisor );
                            }
                        }

                        if( Div != 0 ) {
                            Red /= Div;
                            Green /= Div;
                            Blue /= Div;
                            Alpha /= Div;
                        }
                        Red += ( static_cast<Integer>( this->Threshold ) - 128 );
                        Green += ( static_cast<Integer>( this->Threshold ) - 128 );
                        Blue += ( static_cast<Integer>( this->Threshold ) - 128 );
                        if( this->IncludeAlphaChannel ) {
                            Alpha += ( static_cast<Integer>( this->Threshold ) - 128 );
                        }else{
                            Alpha = static_cast<Integer>( Buffer.GetAlphaByte(X,Y) );
                        }

                        /// @todo The X and Y here was originally swapped when I transposed the code from Ogre Procedural.  It didn't seem right so I changed it.  Who is wronger?
                        TempBuffer.SetPixelByte( X, Y,
                                            static_cast<UInt8>( (Red > 255) ? 255 : ( (Red < 0) ? 0 : Red ) ),
                                            static_cast<UInt8>( (Green > 255) ? 255 : ( (Green < 0) ? 0 : Green ) ),
                                            static_cast<UInt8>( (Blue > 255) ? 255 : ( (Blue < 0) ? 0 : Blue ) ),
                                            static_cast<UInt8>( (Alpha > 255) ? 255 : ( (Alpha < 0) ? 0 : Alpha ) ) );
                    }
                }

                Buffer.SetData(TempBuffer);
            }

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

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

            ConvolutionModifier& ConvolutionModifier::SetKernel(const UInt8 Size, Real* Data)
            {
                if( Size < 3 || Size % 2 == 0 ) {
                    return *this;
                }
                delete[] this->KernelData;
                this->KernelSize = Size;
                this->KernelData = new Real[this->KernelSize * this->KernelSize];
                for( Integer Y = 0 ; Y < this->KernelSize ; ++Y )
                {
                    for( Integer X = 0 ; X < this->KernelSize ; ++X )
                    {
                        this->KernelData[ Y * this->KernelSize + X ] = Data[ Y * this->KernelSize + X ];
                    }
                }
                this->CalculateDivisor();
                return *this;
            }

            ConvolutionModifier& ConvolutionModifier::SetKernel(const UInt8 Size, Integer* Data)
            {
                if( Size < 3 || Size % 2 == 0 ) {
                    return *this;
                }
                delete[] this->KernelData;
                this->KernelSize = Size;
                this->KernelData = new Real[ this->KernelSize * this->KernelSize ];
                for( Integer Y = 0 ; Y < this->KernelSize ; ++Y )
                {
                    for( Integer X = 0 ; X < this->KernelSize ; ++X )
                    {
                        this->KernelData[ Y * this->KernelSize + X ] = static_cast<Real>( Data[ Y * this->KernelSize + X ] );
                    }
                }
                this->CalculateDivisor();
                return *this;
            }

            ConvolutionModifier& ConvolutionModifier::SetKernel(const Matrix3x3& Data)
            {
                delete[] this->KernelData;
                this->KernelSize = 3;
                this->KernelData = new Real[ this->KernelSize * this->KernelSize ];
                for( Integer Y = 0 ; Y < this->KernelSize ; ++Y )
                {
                    for( Integer X = 0 ; X < this->KernelSize ; ++X )
                    {
                        this->KernelData[ Y * this->KernelSize + X ] = Data[Y][X];
                    }
                }
                this->CalculateDivisor();
                return *this;
            }

            ConvolutionModifier& ConvolutionModifier::SetDivisor(const Real Div)
                { this->Divisor = Div;  return *this; }

            ConvolutionModifier& ConvolutionModifier::SetThreshold(const UInt8 Thresh)
                { this->Threshold = Thresh;  return *this; }

            ConvolutionModifier& ConvolutionModifier::SetCalculateEdgeDivisor(const Boole CalculateEdge)
                { this->CalculateEdgeDivisor = CalculateEdge;  return *this; }

            ConvolutionModifier& ConvolutionModifier::SetIncludeAlphaChannel(const Boole IncludeAlpha)
                { this->IncludeAlphaChannel = IncludeAlpha;  return *this; }

            ConvolutionModifier& ConvolutionModifier::CalculateDivisor()
            {
                this->Divisor = 0.0;
                for( Integer Y = 0 ; Y < this->KernelSize ; ++Y )
                {
                    for( Integer X = 0 ; X < this->KernelSize ; ++X )
                    {
                        this->Divisor += this->KernelData[ Y * this->KernelSize + X ];
                    }
                }
                if( this->Divisor == 0.0 ) {
                    this->Divisor = 1.0;
                }

                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif