itkRGBToLuminanceImageAdaptor.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  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 itkRGBToLuminanceImageAdaptor_h
#define itkRGBToLuminanceImageAdaptor_h
 
#include "itkImageAdaptor.h"
#include "itkMath.h"
 
namespace itk
{
namespace Accessor
{
template <typename TInternalType, typename TExternalType>
class RGBToLuminancePixelAccessor
{
public:
  using ExternalType = TExternalType;

  using InternalType = TInternalType;
 
  static inline void
  Set(TInternalType & output, const TExternalType & input)
  {
    output = static_cast<TInternalType>(input.GetLuminance());
  }
 
  static inline TExternalType
  Get(const TInternalType & input)
  {
    return static_cast<TExternalType>(input.GetLuminance());
  }
};
} // end namespace Accessor

template <typename TImage, typename TOutputPixelType>
class RGBToLuminanceImageAdaptor
  : public ImageAdaptor<TImage, Accessor::RGBToLuminancePixelAccessor<typename TImage::PixelType, TOutputPixelType>>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(RGBToLuminanceImageAdaptor);

  using Self = RGBToLuminanceImageAdaptor;
  using Superclass =
    ImageAdaptor<TImage, Accessor::RGBToLuminancePixelAccessor<typename TImage::PixelType, TOutputPixelType>>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(RGBToLuminanceImageAdaptor);
 
protected:
  RGBToLuminanceImageAdaptor() = default;
  ~RGBToLuminanceImageAdaptor() override = default;
};
} // end namespace itk
 
#endif