/*=========================================================================
 *
 *  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 itkBinaryMorphologicalClosingImageFilter_h
#define itkBinaryMorphologicalClosingImageFilter_h

#include "itkKernelImageFilter.h"

namespace itk
{
/**
 * \class BinaryMorphologicalClosingImageFilter
 * \brief binary morphological closing of an image.
 *
 * This filter removes small (i.e., smaller than the structuring
 * element) holes and tube like structures in the interior or at the
 * boundaries of the image. The morphological closing of an image
 * "f" is defined as:
 * Closing(f) = Erosion(Dilation(f)).
 *
 * The structuring element is assumed to be composed of binary
 * values (zero or one). Only elements of the structuring element
 * having values > 0 are candidates for affecting the center pixel.
 *
 *
 * This code was contributed in the Insight Journal paper:
 * "Binary morphological closing and opening image filters"
 * by Lehmann G.
 * https://hdl.handle.net/1926/141
 * http://www.insight-journal.org/browse/publication/58
 *
 *
 * \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France.
 *
 * \sa MorphologyImageFilter, GrayscaleDilateImageFilter, GrayscaleErodeImageFilter
 * \ingroup ImageEnhancement  MathematicalMorphologyImageFilters
 * \ingroup ITKBinaryMathematicalMorphology
 */

template< typename TInputImage, typename TOutputImage, typename TKernel >
class ITK_TEMPLATE_EXPORT BinaryMorphologicalClosingImageFilter:
  public KernelImageFilter< TInputImage, TOutputImage, TKernel >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(BinaryMorphologicalClosingImageFilter);

  /** Standard class type aliases. */
  using Self = BinaryMorphologicalClosingImageFilter;
  using Superclass = KernelImageFilter< TInputImage, TOutputImage, TKernel >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  /** Standard New method. */
  itkNewMacro(Self);

  /** Runtime information support. */
  itkTypeMacro(BinaryMorphologicalClosingImageFilter,
               KernelImageFilter);

  using InputImageType = TInputImage;
  using OutputImageType = TOutputImage;
  using InputImagePointer = typename InputImageType::Pointer;
  using OutputImageRegionType = typename OutputImageType::RegionType;

  /** Declaration of pixel type. */
  using InputPixelType = typename TInputImage::PixelType;
  using OutputPixelType = typename TInputImage::PixelType;

  /** Kernel type alias. */
  using KernelType = TKernel;

  /** Set the value in the image to consider as "foreground". Defaults to
   * maximum value of InputPixelType. */
  itkSetMacro(ForegroundValue, InputPixelType);

  /** Get the value in the image considered as "foreground". Defaults to
   * maximum value of InputPixelType. */
  itkGetConstMacro(ForegroundValue, InputPixelType);

  /** A safe border is added to input image to avoid borders effects
   * and remove it once the closing is done */
  itkSetMacro(SafeBorder, bool);
  itkGetConstReferenceMacro(SafeBorder, bool);
  itkBooleanMacro(SafeBorder);

protected:
  BinaryMorphologicalClosingImageFilter();
  ~BinaryMorphologicalClosingImageFilter() override = default;
  void PrintSelf(std::ostream & os, Indent indent) const override;

  /** Single-threaded version of GenerateData.  This filter delegates
   * to GrayscaleDilateImageFilter GrayscaleErodeImageFilter. */
  void  GenerateData() override;

private:
  InputPixelType m_ForegroundValue;

  bool m_SafeBorder;
}; // end of class
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkBinaryMorphologicalClosingImageFilter.hxx"
#endif

#endif
