/usr/include/OTB-6.4/otbAlphaBlendingFunctor.h is in libotb-dev 6.4.0+dfsg-1.
This file is owned by root:root, with mode 0o644.
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* Copyright (C) 2005-2017 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef otbAlphaBlendingFunctor_h
#define otbAlphaBlendingFunctor_h
#include "itkRGBAPixel.h"
namespace otb
{
namespace Functor
{
/**
* \class AlphaBlendingFunctor
* \brief Implements simple blending
*
* For each channel the blending function is as follows:
* \f[ P_{o} = (1 - \alpha) P_{i1} + \alpha P_{i2} \f]
* with
* \f[ \alpha = \alpha_{pix} * \alpha_{glo} \f]
* \f$ \alpha_{pix} \f$ is retrieved from the second pixel RGBA
* \f$ \alpha_{glo} \f$ is provided by the SetAlpha() method (1.0 by default)
*
*
* \ingroup OTBImageManipulation
*/
template<class TInputPixel1, class TInputPixel2, class TOutputPixel>
class ITK_EXPORT AlphaBlendingFunctorBase
{
public:
AlphaBlendingFunctorBase(): m_Alpha(1.0) {}
~AlphaBlendingFunctorBase(){}
typedef TInputPixel1 InputPixel1Type;
typedef TInputPixel2 InputPixel2Type;
typedef TOutputPixel OutputPixelType;
virtual void SetAlpha(double a)
{
//Keep alpha between 0 and 1
m_Alpha = a<0.0?0.0:(a>1.0?1.0:a);
}
virtual double GetAlpha() const
{
return m_Alpha;
}
virtual inline OutputPixelType operator ()(InputPixel1Type input1, InputPixel2Type input2) const = 0;
protected:
double m_Alpha;
};
template<class TInputPixel1, class TInputPixel2, class TOutputPixel>
class ITK_EXPORT AlphaBlendingFunctor
:public AlphaBlendingFunctorBase< TInputPixel1, TInputPixel2, TOutputPixel >
{
public:
AlphaBlendingFunctor(){}
~AlphaBlendingFunctor(){}
typedef TInputPixel1 InputPixel1Type;
typedef TInputPixel2 InputPixel2Type;
typedef TOutputPixel OutputPixelType;
inline OutputPixelType operator ()(InputPixel1Type input1, InputPixel2Type input2) const
{
OutputPixelType resp;
double alpha = this->GetAlpha();
resp = static_cast<OutputPixelType>(vcl_floor(0.5 + (1.0 - alpha) * static_cast<double>(input1)
+ alpha * static_cast<double>(input2)));
return resp;
}
protected:
double m_Alpha;
};
template<class TInputInternalPixel1, class TInputInternalPixel2, class TOutputInternalPixel>
class ITK_EXPORT AlphaBlendingFunctor< itk::RGBAPixel<TInputInternalPixel1>,
itk::RGBAPixel<TInputInternalPixel2>,
itk::RGBAPixel<TOutputInternalPixel> > :
public AlphaBlendingFunctorBase<itk::RGBAPixel<TInputInternalPixel1>,
itk::RGBAPixel<TInputInternalPixel2>,
itk::RGBAPixel<TOutputInternalPixel> >
{
public:
AlphaBlendingFunctor(){}
~AlphaBlendingFunctor(){}
typedef TInputInternalPixel1 InternalInputPixel1Type;
typedef itk::RGBAPixel<InternalInputPixel1Type> InputPixel1Type;
typedef TInputInternalPixel2 InternalInputPixel2Type;
typedef itk::RGBAPixel<InternalInputPixel2Type> InputPixel2Type;
typedef TOutputInternalPixel InternalOutputPixelType;
typedef itk::RGBAPixel<InternalOutputPixelType> OutputPixelType;
inline OutputPixelType operator ()(InputPixel1Type input1, InputPixel2Type input2) const
{
OutputPixelType resp;
resp.Fill(itk::NumericTraits<InternalOutputPixelType>::max());
double alpha = static_cast<double>(input2.GetAlpha()) / 255.0 * this->GetAlpha();
resp.SetRed(static_cast<InternalOutputPixelType>(vcl_floor(0.5 +
(1.0 - alpha) * static_cast<double>(input1.GetRed())
+ alpha * static_cast<double>(input2.GetRed())
)));
resp.SetGreen(static_cast<InternalOutputPixelType>(vcl_floor(0.5 +
(1.0 - alpha) * static_cast<double>(input1.GetGreen())
+ alpha * static_cast<double>(input2.GetGreen())
)));
resp.SetBlue(static_cast<InternalOutputPixelType>(vcl_floor(0.5 +
(1.0 - alpha) * static_cast<double>(input1.GetBlue())
+ alpha * static_cast<double>(input2.GetBlue())
)));
return resp;
}
protected:
double m_Alpha;
};
}
}
#endif
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