itkBinaryContourImageFilter.h

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/*=========================================================================
 *
 *  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 __itkBinaryContourImageFilter_h
#define __itkBinaryContourImageFilter_h

#include "itkInPlaceImageFilter.h"
#include "itkConceptChecking.h"
#include "itkBarrier.h"
#include <vector>

namespace itk
{
template< class TInputImage, class TOutputImage >
class ITK_EXPORT BinaryContourImageFilter:
  public InPlaceImageFilter< TInputImage, TOutputImage >
{
public:
  typedef BinaryContourImageFilter                        Self;
  typedef InPlaceImageFilter< TInputImage, TOutputImage > Superclass;
  typedef SmartPointer< Self >                            Pointer;
  typedef SmartPointer< const Self >                      ConstPointer;

  itkTypeMacro(BinaryContourImageFilter, ImageToImageFilter);

  itkNewMacro(Self);

  typedef TInputImage                                 InputImageType;
  typedef typename InputImageType::Pointer            InputImagePointer;
  typedef typename InputImageType::ConstPointer       InputImageConstPointer;
  typedef typename InputImageType::IndexType          IndexType;
  typedef typename InputImageType::SizeType           SizeType;
  typedef typename InputImageType::OffsetType         OffsetType;
  typedef typename InputImageType::PixelType          InputImagePixelType;
  typedef typename InputImageType::InternalPixelType  InputInternalPixelType;

  typedef TOutputImage                                OutputImageType;
  typedef typename OutputImageType::Pointer           OutputImagePointer;
  typedef typename OutputImageType::RegionType        RegionType;
  typedef typename OutputImageType::IndexType         OutputIndexType;
  typedef typename OutputImageType::SizeType          OutputSizeType;
  typedef typename OutputImageType::OffsetType        OutputOffsetType;
  typedef typename OutputImageType::PixelType         OutputImagePixelType;
  typedef typename OutputImageType::InternalPixelType OutputInternalPixelType;

  itkStaticConstMacro(ImageDimension, unsigned int,
                      OutputImageType::ImageDimension);

#ifdef ITK_USE_CONCEPT_CHECKING
  itkStaticConstMacro(InputImageDimension, unsigned int,
                      InputImageType::ImageDimension);

  // Concept checking -- input and output dimensions must be the same
  itkConceptMacro( SameDimension,
                   ( Concept::SameDimension< itkGetStaticConstMacro(ImageDimension),
                                             itkGetStaticConstMacro(OutputImageDimension) > ) );
#endif

  itkSetMacro(FullyConnected, bool);
  itkGetConstReferenceMacro(FullyConnected, bool);
  itkBooleanMacro(FullyConnected);

  itkSetMacro(BackgroundValue, OutputImagePixelType);
  itkGetConstMacro(BackgroundValue, OutputImagePixelType);

  itkSetMacro(ForegroundValue, InputImagePixelType);
  itkGetConstMacro(ForegroundValue, InputImagePixelType);

protected:

  BinaryContourImageFilter();
  virtual ~BinaryContourImageFilter() {}

  void PrintSelf(std::ostream & os, Indent indent) const;

  void BeforeThreadedGenerateData();

  void AfterThreadedGenerateData();

  void ThreadedGenerateData(const RegionType & outputRegionForThread,
                            ThreadIdType threadId);

  void GenerateInputRequestedRegion();

  void EnlargeOutputRequestedRegion( DataObject * itkNotUsed(output) );

private:
  BinaryContourImageFilter(const Self &); //Purposefully not implemented
  void operator = ( const Self &);        //Purposefully not implemented

  // types to support the run length encoding of lines
  struct runLength
  {
    runLength( const OffsetValueType& iLength, const IndexType& iWhere ) :
      m_Length( iLength ), m_Where( iWhere ) {}

    // run length information - may be a more type safe way of doing this
    OffsetValueType m_Length;

    // Index of the start of the run
    IndexType       m_Where;
  };

  typedef std::vector< runLength >                  LineEncodingType;
  typedef typename LineEncodingType::iterator       LineEncodingIterator;
  typedef typename LineEncodingType::const_iterator LineEncodingConstIterator;

  // the map storing lines
  typedef std::vector< LineEncodingType > LineMapType;

  typedef std::vector< OffsetValueType > OffsetVec;

  bool CheckNeighbors(const OutputIndexType & A,
                      const OutputIndexType & B);

  void CompareLines(LineEncodingType & current,
                    const LineEncodingType & Neighbour);

  void SetupLineOffsets(OffsetVec & LineOffsets);

  void Wait();

  Barrier::Pointer m_Barrier;

  LineMapType   m_ForegroundLineMap;
  LineMapType   m_BackgroundLineMap;
  ThreadIdType  m_NumberOfThreads;

  InputImagePixelType  m_ForegroundValue;
  OutputImagePixelType m_BackgroundValue;
  bool                 m_FullyConnected;
};
} // end namespace itk

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

#endif