alphamodifier.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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 furnished to do so, subject to the following conditions:

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 all copies or substantial portions of the Software.

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 */
#ifndef _graphicsproceduralalphamodifier_cpp
#define _graphicsproceduralalphamodifier_cpp

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

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            AlphaModifier::AlphaModifier() :
                ExtractColour(1.0,1.0,1.0,1.0)
                {  }

            AlphaModifier::~AlphaModifier()
                {  }

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

            void AlphaModifier::Modify(TextureBuffer& Buffer)
            {
                Whole Width = Buffer.GetWidth();
                Whole Height = Buffer.GetHeight();

                for( Whole Y = 0 ; Y < Height ; ++Y )
                {
                    for( Whole X = 0 ; X < Width ; ++X )
                    {
                        Real Red = static_cast<Real>( Buffer.GetRedByte(X,Y) ) * this->ExtractColour.RedChannel;
                        Real Green = static_cast<Real>( Buffer.GetGreenByte(X,Y) ) * this->ExtractColour.GreenChannel;
                        Real Blue = static_cast<Real>( Buffer.GetBlueByte(X,Y) ) * this->ExtractColour.BlueChannel;
                        UInt8 Alpha = static_cast<UInt8>( ( static_cast<Whole>( Buffer.GetAlphaByte(X,Y) ) + static_cast<Whole>(Red + Green + Blue) ) >> 1 );
                        Buffer.SetPixelByte(X,Y,Alpha,Alpha,Alpha,Alpha);
                    }
                }
            }

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

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

            AlphaModifier& AlphaModifier::SetExtractColour(const ColourValue& Extract)
                { this->ExtractColour = Extract;  return *this; }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif