itkImageIORegion.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
 *
 *         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 itkImageIORegion_h
#define itkImageIORegion_h
 
#include <algorithm>
#include "itkIntTypes.h"
#include "itkObjectFactory.h"
#include "itkImageRegion.h"
 
namespace itk
{
class ITKCommon_EXPORT ImageIORegion : public Region
{
public:
  using Self = ImageIORegion;
  using Superclass = Region;
 
  using SizeValueType = ::itk::SizeValueType;
  using IndexValueType = ::itk::IndexValueType;
  using OffsetValueType = ::itk::OffsetValueType;
 
  using IndexType = std::vector<IndexValueType>;
 
  using SizeType = std::vector<SizeValueType>;
 
  using RegionType = Superclass::RegionEnum;
 
  itkTypeMacro(ImageIORegion, Region);
 
  unsigned int
  GetImageDimension() const;
 
  unsigned int
  GetRegionDimension() const;
 
  RegionType
  GetRegionType() const override;
 
  ImageIORegion(unsigned int dimension);
 
  ImageIORegion() = default;
 
  ~ImageIORegion() override;
 
  ImageIORegion(const Self &) = default;
 
  ImageIORegion(Self &&) = default;
 
  Self &
  operator=(const Self & region);
 
  Self &
  operator=(Self &&) = default;
 
  void
  SetIndex(const IndexType & index);
 
  const IndexType &
  GetIndex() const;
  IndexType &
  GetModifiableIndex();
 
  void
  SetSize(const SizeType & size);
 
  const SizeType &
  GetSize() const;
  SizeType &
  GetModifiableSize();
 
  SizeValueType
  GetSize(unsigned long i) const;
 
  IndexValueType
  GetIndex(unsigned long i) const;
 
  void
  SetSize(const unsigned long i, SizeValueType size);
 
  void
  SetIndex(const unsigned long i, IndexValueType idx);
 
  bool
  operator==(const Self & region) const;
 
  bool
  operator!=(const Self & region) const;
 
  bool
  IsInside(const IndexType & index) const;
 
  bool
  IsInside(const Self & region) const;
 
  SizeValueType
  GetNumberOfPixels() const;
 
protected:
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
private:
  unsigned int m_ImageDimension{ 2 };
  IndexType    m_Index{ IndexType(2) };
  SizeType     m_Size{ SizeType(2) };
};
 
 
// Declare operator<<
extern ITKCommon_EXPORT std::ostream &
                        operator<<(std::ostream & os, const ImageIORegion & region);
 
 
template <unsigned int VDimension>
class ImageIORegionAdaptor
{
public:
  using ImageRegionType = ImageRegion<VDimension>;
  using ImageIORegionType = ImageIORegion;
 
  using ImageSizeType = typename ImageRegionType::SizeType;
  using ImageIndexType = typename ImageRegionType::IndexType;
 
  static void
  Convert(const ImageRegionType & inImageRegion,
          ImageIORegionType &     outIORegion,
          const ImageIndexType &  largestRegionIndex)
  {
    //
    // The ImageRegion and ImageIORegion objects may have different dimensions.
    // Here we only copy the common dimensions between the two. If the
    // ImageRegion
    // has more dimensions than the ImageIORegion, then the defaults of the
    // ImageRegion
    // will take care of the remaining codimension. If the ImageRegion has less
    // dimensions
    // than the ImageIORegion, then the remaining IO dimensions are simply
    // ignored.
    //
    const unsigned int ioDimension = outIORegion.GetImageDimension();
    const unsigned int imageDimension = VDimension;
 
    const unsigned int minDimension = std::min(ioDimension, imageDimension);
 
    const ImageSizeType &  size = inImageRegion.GetSize();
    const ImageIndexType & index = inImageRegion.GetIndex();
 
    for (unsigned int i = 0; i < minDimension; ++i)
    {
      outIORegion.SetSize(i, size[i]);
      outIORegion.SetIndex(i, index[i] - largestRegionIndex[i]);
    }
 
    //
    // Fill in the remaining codimension (if any) with default values
    //
    for (unsigned int k = minDimension; k < ioDimension; ++k)
    {
      outIORegion.SetSize(k, 1); // Note that default size in IO is 1 not 0
      outIORegion.SetIndex(k, 0);
    }
  }
 
  static void
  Convert(const ImageIORegionType & inIORegion,
          ImageRegionType &         outImageRegion,
          const ImageIndexType &    largestRegionIndex)
  {
    ImageSizeType  size;
    ImageIndexType index;
 
    size.Fill(1); // initialize with default values
    index.Fill(0);
 
    //
    // The ImageRegion and ImageIORegion objects may have different dimensions.
    // Here we only copy the common dimensions between the two. If the
    // ImageRegion
    // has more dimensions than the ImageIORegion, then the defaults of the
    // ImageRegion
    // will take care of the remaining codimension. If the ImageRegion has less
    // dimensions
    // than the ImageIORegion, then the remaining IO dimensions are simply
    // ignored.
    //
    const unsigned int ioDimension = inIORegion.GetImageDimension();
    const unsigned int imageDimension = VDimension;
 
    const unsigned int minDimension = std::min(ioDimension, imageDimension);
 
    for (unsigned int i = 0; i < minDimension; ++i)
    {
      size[i] = inIORegion.GetSize(i);
      index[i] = inIORegion.GetIndex(i) + largestRegionIndex[i];
    }
 
    outImageRegion.SetSize(size);
    outImageRegion.SetIndex(index);
  }
};
} // end namespace itk
 
#endif