/*=========================================================================
 *
 *  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 __itkCropImageFilter_h
#define __itkCropImageFilter_h

#include "itkExtractImageFilter.h"

namespace itk
{
/** \class CropImageFilter
 * \brief Decrease the image size by cropping the image by an itk::Size at
 * both the upper and lower bounds of the largest possible region.
 *
 * CropImageFilter changes the image boundary of an image by removing
 * pixels outside the target region.  The target region is not specified in
 * advance, but calculated in BeforeThreadedGenerateData().
 *
 * This filter uses ExtractImageFilter to perform the cropping.
 *
 * \ingroup GeometricTransform
 * \ingroup ITKImageGrid
 *
 * \wiki
 * \wikiexample{ImageProcessing/CropImageFilter,Crop an image by specifying the region to throw away}
 * \endwiki
 */
template< typename TInputImage, typename TOutputImage >
class CropImageFilter:
  public ExtractImageFilter< TInputImage, TOutputImage >
{
public:
  /** Standard class typedefs. */
  typedef CropImageFilter                                 Self;
  typedef ExtractImageFilter< TInputImage, TOutputImage > Superclass;
  typedef SmartPointer< Self >                            Pointer;
  typedef SmartPointer< const Self >                      ConstPointer;

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

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

  /** Typedef to describe the output and input image region types. */
  typedef typename Superclass::OutputImageRegionType OutputImageRegionType;
  typedef typename Superclass::InputImageRegionType  InputImageRegionType;

  /** Typedef to describe the type of pixel. */
  typedef typename Superclass::OutputImagePixelType OutputImagePixelType;
  typedef typename Superclass::InputImagePixelType  InputImagePixelType;

  /** Typedef to describe the output and input image index and size types. */
  typedef typename Superclass::OutputImageIndexType OutputImageIndexType;
  typedef typename Superclass::InputImageIndexType  InputImageIndexType;
  typedef typename Superclass::OutputImageSizeType  OutputImageSizeType;
  typedef typename Superclass::InputImageSizeType   InputImageSizeType;
  typedef InputImageSizeType                        SizeType;

  /** ImageDimension constants */
  itkStaticConstMacro(InputImageDimension, unsigned int,
                      Superclass::InputImageDimension);
  itkStaticConstMacro(OutputImageDimension, unsigned int,
                      Superclass::OutputImageDimension);

  /** Set/Get the cropping sizes for the upper and lower boundaries. */
  itkSetMacro(UpperBoundaryCropSize, SizeType);
  itkGetConstMacro(UpperBoundaryCropSize, SizeType);
  itkSetMacro(LowerBoundaryCropSize, SizeType);
  itkGetConstMacro(LowerBoundaryCropSize, SizeType);

  void SetBoundaryCropSize(const SizeType & s)
  {
    this->SetUpperBoundaryCropSize(s);
    this->SetLowerBoundaryCropSize(s);
  }

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( InputConvertibleToOutputCheck,
                   ( Concept::Convertible< InputImagePixelType, OutputImagePixelType > ) );
  itkConceptMacro( SameDimensionCheck,
                   ( Concept::SameDimension< InputImageDimension, OutputImageDimension > ) );
  // End concept checking
#endif

protected:
  CropImageFilter()
  {
    this->SetDirectionCollapseToSubmatrix();
    m_UpperBoundaryCropSize.Fill(0);
    m_LowerBoundaryCropSize.Fill(0);
  }

  ~CropImageFilter() {}
  void PrintSelf(std::ostream & os, Indent indent) const;

  void GenerateOutputInformation();

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

  SizeType m_UpperBoundaryCropSize;
  SizeType m_LowerBoundaryCropSize;
};
} // end namespace itk

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

#endif
