text: /*=========================================================================
   *
   *  Copyright Insight Software Consortium
   *
   *  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.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 itkPolylineMask2DImageFilter_h
  #define itkPolylineMask2DImageFilter_h
  
  #include "itkImageToImageFilter.h"
  #include "itkImageRegionIteratorWithIndex.h"
  
  namespace itk
  {
  /** \class PolylineMask2DImageFilter
   * \brief Implements 2D image masking operation constrained by a contour.
   *
   * This class is parameterized over input image type, contour defined by a polyline,
   * and output image type. If the input image is three dimensional, the masking operation is
   * performed on each slice (2D image). The output image will have two regions demarcated
   * by the contour i.e inside(masked) and outside region.  The pixels in the
   * masked region will keep their original intensity values. Whereas, intensity
   * value of pixels outside the masked region will be set to zero.
   *
   * \warning The Polygon represented by the input Polyline must be a convex polygon.
   * \warning The Polygon's inside is defined by the standard clock-wise
   * convention. That is, when walking along the polygon, the inside of the
   * polygon is at the right-hand side. Note also that this must be interpreted
   * in the natural coordinate system used by ITK, not the one used in computer
   * graphics.
   *
   * \ingroup ImageToImageFilter
   * \sa  PolylineMaskImageFilter
   * \ingroup ITKImageIntensity
   */
  template< typename TInputImage, typename TPolyline,
            typename TOutputImage >
  class ITK_TEMPLATE_EXPORT PolylineMask2DImageFilter:public ImageToImageFilter< TInputImage, TOutputImage >
  {
  public:
    ITK_DISALLOW_COPY_AND_ASSIGN(PolylineMask2DImageFilter);
  
    /** Standard class type aliases. */
    using Self = PolylineMask2DImageFilter;
    using Superclass = ImageToImageFilter< TInputImage, TOutputImage >;
    using Pointer = SmartPointer< Self >;
    using ConstPointer = SmartPointer< const Self >;
  
    /** Method for creation through the object factory. */
    itkNewMacro(Self);
  
    /** Run-time type information (and related methods). */
    itkTypeMacro(PolylineMask2DImageFilter, ImageToImageFilter);
  
    /** Number of dimensions. */
    static constexpr unsigned int NDimensions = TInputImage::ImageDimension;
    static constexpr unsigned int NOutputDimensions = TOutputImage::ImageDimension;
  
    /** Some convenient type alias for input image */
    using InputImageType = TInputImage;
    using InputImageConstPointer = typename InputImageType::ConstPointer;
    using InputImagePointer = typename InputImageType::Pointer;
    using InputImageRegionType = typename InputImageType::RegionType;
    using InputImagePixelType = typename InputImageType::PixelType;
  
    /* type alias for the polyline type */
    using PolylineType = TPolyline;
  
    /* type alias for the output image */
    using OutputImageType = TOutputImage;
    using OutputImagePointer = typename OutputImageType::Pointer;
    using OutputImageRegionType = typename OutputImageType::RegionType;
    using OutputImagePixelType = typename OutputImageType::PixelType;
  
    /** Read in image and polyline inputs */
    void SetInput1(const InputImageType *image);
  
    void SetInput2(const PolylineType *polyline);
  
  #ifdef ITK_USE_CONCEPT_CHECKING
    // Begin concept checking
    itkConceptMacro( SameDimensionCheck,
                     ( Concept::SameDimension< NDimensions, NOutputDimensions > ) );
    itkConceptMacro( IntConvertibleOutputCheck,
                     ( Concept::Convertible< int, OutputImagePixelType > ) );
    itkConceptMacro( OutputEqualityComparableCheck,
                     ( Concept::EqualityComparable< OutputImagePixelType > ) );
    itkConceptMacro( InputConvertibleToOutputCheck,
                     ( Concept::Convertible< InputImagePixelType, OutputImagePixelType > ) );
    // End concept checking
  #endif
  
  protected:
    PolylineMask2DImageFilter();
    ~PolylineMask2DImageFilter() override = default;
  
    void GenerateData() override;
  };
  } // end namespace itk
  
  #ifndef ITK_MANUAL_INSTANTIATION
  #include "itkPolylineMask2DImageFilter.hxx"
  #endif
  
  #endif
  