thresholdmodifier.cpp

// © Copyright 2010 - 2016 BlackTopp Studios Inc.
/* This file is part of The Mezzanine Engine.

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*/
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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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 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
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 -----------------------------------------------------------------------------
 */
#ifndef _graphicsproceduralthresholdmodifier_cpp
#define _graphicsproceduralthresholdmodifier_cpp

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

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            ThresholdModifier::ThresholdModifier() :
                ThresholdColour(0.0,0.0,0.0,1.0),
                LowerLimit(0.0),
                UpperLimit(1.0),
                Threshold(ThresholdModifier::TM_Below),
                Replace(ThresholdModifier::RM_PixelIntensity)
                {  }

            ThresholdModifier::~ThresholdModifier()
                {  }

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

            void ThresholdModifier::Modify(TextureBuffer& Buffer)
            {
                Whole TargetWidth = Buffer.GetWidth();
                Whole TargetHeight = Buffer.GetHeight();

                for( Whole Y = 0 ; Y < TargetHeight ; ++Y )
                {
                    for( Whole X = 0 ; X < TargetWidth ; ++X )
                    {
                        const ColourValue Pixel = Buffer.GetPixel(X,Y);

                        if( this->Replace == ThresholdModifier::RM_PixelIntensity ) {
                            Real Intensity = ( Pixel.RedChannel + Pixel.GreenChannel + Pixel.BlueChannel ) / 3;

                            if( this->Threshold & ThresholdModifier::TM_Below && Intensity < this->LowerLimit ) {
                                Buffer.SetPixel(X,Y,this->ThresholdColour);
                            }else if( this->Threshold & ThresholdModifier::TM_Above && Intensity > this->UpperLimit ) {
                                Buffer.SetPixel(X,Y,this->ThresholdColour);
                            }
                        }else if( this->Replace == ThresholdModifier::RM_ColourChannels ) {
                            if( this->Threshold & ThresholdModifier::TM_Below && Pixel.RedChannel < this->LowerLimit ) {
                                Buffer.SetRedReal(X,Y,this->ThresholdColour.RedChannel);
                            }else if( this->Threshold & ThresholdModifier::TM_Above && Pixel.RedChannel > this->UpperLimit ) {
                                Buffer.SetRedReal(X,Y,this->ThresholdColour.RedChannel);
                            }

                            if( this->Threshold & ThresholdModifier::TM_Below && Pixel.GreenChannel < this->LowerLimit ) {
                                Buffer.SetGreenReal(X,Y,this->ThresholdColour.GreenChannel);
                            }else if( this->Threshold & ThresholdModifier::TM_Above && Pixel.GreenChannel > this->UpperLimit ) {
                                Buffer.SetGreenReal(X,Y,this->ThresholdColour.GreenChannel);
                            }

                            if( this->Threshold & ThresholdModifier::TM_Below && Pixel.BlueChannel < this->LowerLimit ) {
                                Buffer.SetBlueReal(X,Y,this->ThresholdColour.BlueChannel);
                            }else if( this->Threshold & ThresholdModifier::TM_Above && Pixel.BlueChannel > this->UpperLimit ) {
                                Buffer.SetBlueReal(X,Y,this->ThresholdColour.BlueChannel);
                            }
                        }
                    }
                }
            }

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

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

            ThresholdModifier& ThresholdModifier::SetColour(const ColourValue& Colour)
                { this->ThresholdColour = Colour;  return *this; }

            ThresholdModifier& ThresholdModifier::SetColour(const Real Red, const Real Green, const Real Blue, const Real Alpha)
                { this->ThresholdColour.SetValues(Red,Green,Blue,Alpha);  return *this; }

            ThresholdModifier& ThresholdModifier::SetLowerLimit(const Real Lower)
                { this->LowerLimit = Lower;  return *this; }

            ThresholdModifier& ThresholdModifier::SetUpperLimit(const Real Upper)
                { this->UpperLimit = Upper;  return *this; }

            ThresholdModifier& ThresholdModifier::SetLimitRange(const Real Lower, const Real Upper)
                { this->LowerLimit = Lower;  this->UpperLimit = Upper;  return *this; }

            ThresholdModifier& ThresholdModifier::SetThresholdMode(const ThresholdModifier::ThresholdMode Mode)
                { this->Threshold = Mode;  return *this; }

            ThresholdModifier& ThresholdModifier::SetReplaceMode(const ThresholdModifier::ReplaceMode Mode)
                { this->Replace = Mode;  return *this; }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif