/*
 * 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 otbRGBAPixelConverter_h
#define otbRGBAPixelConverter_h

#include "itkProcessObject.h"
#include "itkRGBAPixel.h"
#include "itkRGBPixel.h"

namespace otb
{
/**
 * \class RGBAPixelConverter
 * \brief Convert an itk::RGBApixel<InternalType> into another pixel
 * type
 *
 * To be usable, the desired conversion must be implemented through
 * partial specialisation mechanism.
 *
 *
 * \ingroup OTBCommon
 */


//RGBA to Scalar
template <class TInternalInputPixelType, class TOutputPixelType>
class ITK_EXPORT RGBAPixelConverter :
public itk::ProcessObject
{
public:
  /** Standard class typedefs */
  typedef RGBAPixelConverter                           Self;
  typedef itk::ProcessObject                           Superclass;
  typedef itk::SmartPointer<Self>                      Pointer;
  typedef itk::SmartPointer<const Self>                ConstPointer;

  /** Run-time type information (and related methods). */
  itkTypeMacro(RGBAPixelConverter, ProcessObject);

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  typedef typename itk::RGBAPixel<TInternalInputPixelType>   InputPixelType;
  typedef TOutputPixelType                                   OutputPixelType;

  OutputPixelType Convert (InputPixelType input);

protected:
  RGBAPixelConverter(){}
  ~RGBAPixelConverter() override{}
  void PrintSelf(std::ostream& os, itk::Indent indent) const override
  {
    Superclass::PrintSelf(os, indent);
  }

private:
  RGBAPixelConverter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
};

//RGBA to RGBA
template <class TInternalInputPixelType, class TInternalOutputPixelType>
class ITK_EXPORT RGBAPixelConverter<TInternalInputPixelType,
                                    typename itk::RGBAPixel<TInternalOutputPixelType> > :
public itk::ProcessObject
{
public:
  /** Standard class typedefs */
  typedef RGBAPixelConverter                           Self;
  typedef itk::ProcessObject                           Superclass;
  typedef itk::SmartPointer<Self>                      Pointer;
  typedef itk::SmartPointer<const Self>                ConstPointer;

  /** Run-time type information (and related methods). */
  itkTypeMacro(RGBAPixelConverter, ProcessObject);

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  typedef typename itk::RGBAPixel<TInternalInputPixelType>   InputPixelType;
  typedef typename itk::RGBAPixel<TInternalOutputPixelType>  OutputPixelType;

  OutputPixelType Convert (InputPixelType input);

protected:
  RGBAPixelConverter(){}
  ~RGBAPixelConverter() override{}
  void PrintSelf(std::ostream& os, itk::Indent indent) const override
  {
    Superclass::PrintSelf(os, indent);
  }

private:
  RGBAPixelConverter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
};

//RGBA to RGB
template <class TInternalInputPixelType, class TInternalOutputPixelType>
class ITK_EXPORT RGBAPixelConverter<TInternalInputPixelType,
                                    typename itk::RGBPixel<TInternalOutputPixelType> > :
public itk::ProcessObject
{
public:
  /** Standard class typedefs */
  typedef RGBAPixelConverter                           Self;
  typedef itk::ProcessObject                           Superclass;
  typedef itk::SmartPointer<Self>                      Pointer;
  typedef itk::SmartPointer<const Self>                ConstPointer;

  /** Run-time type information (and related methods). */
  itkTypeMacro(RGBAPixelConverter, ProcessObject);

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  typedef typename itk::RGBAPixel<TInternalInputPixelType>   InputPixelType;
  typedef typename itk::RGBPixel<TInternalOutputPixelType>  OutputPixelType;

  OutputPixelType Convert (InputPixelType input);

protected:
  RGBAPixelConverter(){}
  ~RGBAPixelConverter() override{}
  void PrintSelf(std::ostream& os, itk::Indent indent) const override
  {
    Superclass::PrintSelf(os, indent);
  }

private:
  RGBAPixelConverter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
};

} // end namespace otb

#ifndef OTB_MANUAL_INSTANTIATION
#include "otbRGBAPixelConverter.txx"
#endif

#endif
