vtkDICOMImageReader.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkDICOMImageReader_h
#define vtkDICOMImageReader_h

#include "vtkIOImageModule.h" // For export macro
#include "vtkImageReader2.h"

#include <istream>   // for IStream
#include <streambuf> // for Streambuf

VTK_ABI_NAMESPACE_BEGIN
class vtkDICOMImageReaderVector;
class DICOMParser;
class DICOMAppHelper;

class VTKIOIMAGE_EXPORT vtkDICOMImageReader : public vtkImageReader2
{
public:

  static vtkDICOMImageReader* New();
  vtkTypeMacro(vtkDICOMImageReader, vtkImageReader2);

  void PrintSelf(ostream& os, vtkIndent indent) override;


  void SetFileName(VTK_FILEPATH const char* fn) override
  {
    delete[] this->DirectoryName;
    delete[] this->FileName;
    this->DirectoryName = nullptr;
    this->FileName = nullptr;
    this->vtkImageReader2::SetFileName(fn);
  }

  void SetDirectoryName(VTK_FILEPATH const char* dn);


  vtkGetFilePathMacro(DirectoryName);

  double* GetPixelSpacing() VTK_SIZEHINT(3);

  int GetWidth();

  int GetHeight();

  float* GetImagePositionPatient() VTK_SIZEHINT(3);

  float* GetImageOrientationPatient() VTK_SIZEHINT(6);

  int GetBitsAllocated();

  int GetPixelRepresentation();

  int GetNumberOfComponents();

  const char* GetTransferSyntaxUID();

  float GetRescaleSlope();

  float GetRescaleOffset();

  const char* GetPatientName();

  const char* GetStudyUID();

  const char* GetStudyID();

  float GetGantryAngle();


  int CanReadFile(VTK_FILEPATH const char* fname) override;
  int CanReadFile(vtkResourceStream* stream) override;

  //
  // What file extensions are supported?
  //
  const char* GetFileExtensions() override { return ".dcm"; }

  const char* GetDescriptiveName() override { return "DICOM"; }

protected:
  //
  // Setup the volume size
  //
  void SetupOutputInformation(int num_slices);

  void ExecuteInformation() override;
  void ExecuteDataWithInformation(vtkDataObject* out, vtkInformation* outInfo) override;

  //
  // Constructor
  //
  vtkDICOMImageReader();

  //
  // Destructor
  //
  ~vtkDICOMImageReader() override;

  //
  // Instance of the parser used to parse the file.
  //
  DICOMParser* Parser;

  //
  // Instance of the callbacks that get the data from the file.
  //
  DICOMAppHelper* AppHelper;

  //
  // vtkDICOMImageReaderVector wants to be a PIMPL and it will be, but not quite yet.
  //
  vtkDICOMImageReaderVector* DICOMFileNames;
  char* DirectoryName;

  char* PatientName;
  char* StudyUID;
  char* StudyID;
  char* TransferSyntaxUID;

  // DICOMFileNames accessor methods for subclasses:
  int GetNumberOfDICOMFileNames();
  VTK_FILEPATH const char* GetDICOMFileName(int index);

private:
  vtkDICOMImageReader(const vtkDICOMImageReader&) = delete;
  void operator=(const vtkDICOMImageReader&) = delete;

  // Used when reading streams
  std::unique_ptr<std::streambuf> Streambuf;
};

VTK_ABI_NAMESPACE_END
#endif