itkNiftiImageIO.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 itkNiftiImageIO_h
#define itkNiftiImageIO_h
#include "ITKIONIFTIExport.h"
 
 
#include <fstream>
#include <memory>
#include "itkImageIOBase.h"
 
namespace itk
{
 
 
enum class Analyze75Flavor : uint8_t
{
  AnalyzeITK4 = 4,
 
  AnalyzeFSL = 3,
 
  AnalyzeSPM = 2,
 
  AnalyzeITK4Warning = 1,
 
  AnalyzeReject = 0
};
 
extern ITKIONIFTI_EXPORT std::ostream &
                         operator<<(std::ostream & out, const Analyze75Flavor value);
 
class ITKIONIFTI_EXPORT NiftiImageIO : public ImageIOBase
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(NiftiImageIO);
 
  using Self = NiftiImageIO;
  using Superclass = ImageIOBase;
  using Pointer = SmartPointer<Self>;
 
  itkNewMacro(Self);
 
  itkTypeMacro(NiftiImageIO, Superclass);
 
  //-------- This part of the interfaces deals with reading data. -----
 
  enum FileType
  {
 
    TwoFileNifti = 2,
 
    OneFileNifti = 1,
 
    Analyze75 = 0,
 
    OtherOrError = -1,
  };
 
 
  FileType
  DetermineFileType(const char * FileNameToRead);
 
  bool
  CanReadFile(const char * FileNameToRead) override;
 
  void
  ReadImageInformation() override;
 
  void
  Read(void * buffer) override;
 
  //-------- This part of the interfaces deals with writing data. -----
 
  bool
  CanWriteFile(const char * FileNameToWrite) override;
 
  void
  WriteImageInformation() override;
 
  void
  Write(const void * buffer) override;
 
  ImageIORegion
  GenerateStreamableReadRegionFromRequestedRegion(const ImageIORegion & requestedRegion) const override;
 
  itkSetMacro(RescaleSlope, double);
  itkSetMacro(RescaleIntercept, double);
 
  itkSetMacro(LegacyAnalyze75Mode, Analyze75Flavor);
  itkGetConstMacro(LegacyAnalyze75Mode, Analyze75Flavor);
 
protected:
  NiftiImageIO();
  ~NiftiImageIO() override;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
  virtual bool
  GetUseLegacyModeForTwoFileWriting() const
  {
    return false;
  }
 
private:
  // Try to use the Q and S form codes from MetaDataDictionary if they are specified
  // there, otherwise default to the backwards compatible values from earlier
  // versions of ITK. The qform guess would probably been better to have
  // been guessed as NIFTI_XFORM_SCANNER_ANAT
  unsigned int
  getSFormCodeFromDictionary() const;
  unsigned int
  getQFormCodeFromDictionary() const;
 
  bool
  MustRescale() const;
 
  void
  DefineHeaderObjectDataType();
 
  void
  SetNIfTIOrientationFromImageIO(unsigned short int origdims, unsigned short int dims);
 
  void
  SetImageIOOrientationFromNIfTI(unsigned short int dims);
 
  void
  SetImageIOMetadataFromNIfTI();
 
  // This proxy class provides a nifti_image pointer interface to the internal implementation
  // of itk::NiftiImageIO, while hiding the niftilib interface from the external ITK interface.
  class NiftiImageProxy;
 
  // Note that it is essential that m_NiftiImageHolder is defined before m_NiftiImage, to ensure that
  // m_NiftiImage can directly get a proxy from m_NiftiImageHolder during NiftiImageIO construction.
  const std::unique_ptr<NiftiImageProxy> m_NiftiImageHolder;
 
  NiftiImageProxy & m_NiftiImage;
 
  double m_RescaleSlope{ 1.0 };
  double m_RescaleIntercept{ 0.0 };
 
  IOComponentEnum m_OnDiskComponentType{ IOComponentEnum::UNKNOWNCOMPONENTTYPE };
 
  Analyze75Flavor m_LegacyAnalyze75Mode;
};
 
 
} // end namespace itk
 
#endif // itkNiftiImageIO_h