itkOFFMeshIO.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
 *
 *         https://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 itkOFFMeshIO_h
#define itkOFFMeshIO_h
#include "ITKIOMeshOFFExport.h"
 
#include "itkMeshIOBase.h"
#include "itkMakeUniqueForOverwrite.h"
 
#include <fstream>
 
namespace itk
{
 
class ITKIOMeshOFF_EXPORT OFFMeshIO : public MeshIOBase
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(OFFMeshIO);

  using Self = OFFMeshIO;
  using Superclass = MeshIOBase;
  using ConstPointer = SmartPointer<const Self>;
  using Pointer = SmartPointer<Self>;
 
  using SizeValueType = Superclass::SizeValueType;
  using StreamOffsetType = Superclass::StreamOffsetType;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(OFFMeshIO);
 
  /*-------- This part of the interfaces deals with reading data. ----- */

  bool
  CanReadFile(const char * fileName) override;

  void
  ReadMeshInformation() override;

  void
  ReadPoints(void * buffer) override;
 
  void
  ReadCells(void * buffer) override;
 
  void
  ReadPointData(void * buffer) override;
 
  void
  ReadCellData(void * buffer) override;
 
  /*-------- This part of the interfaces deals with writing data. ----- */

  bool
  CanWriteFile(const char * fileName) override;

  void
  WriteMeshInformation() override;

  void
  WritePoints(void * buffer) override;
 
  void
  WriteCells(void * buffer) override;
 
  void
  WritePointData(void * buffer) override;
 
  void
  WriteCellData(void * buffer) override;
 
  void
  Write() override;
 
protected:
  template <typename T>
  void
  ReadCellsBufferAsAscii(T * buffer, std::ifstream & inputFile)
  {
    SizeValueType index = 0;
    unsigned int  numberOfPoints = 0;
    std::string   line;
 
    for (SizeValueType ii = 0; ii < this->m_NumberOfCells; ++ii)
    {
      inputFile >> numberOfPoints;
      buffer[index++] = static_cast<T>(numberOfPoints);
      for (unsigned int jj = 0; jj < numberOfPoints; ++jj)
      {
        inputFile >> buffer[index++];
      }
      std::getline(inputFile, line, '\n');
    }
  }

  template <typename TInput, typename TOutput>
  void
  ReadCellsBuffer(TInput * input, TOutput * output)
  {
    if (input && output)
    {
      SizeValueType indInput = 0;
      SizeValueType indOutput = 0;
      for (SizeValueType ii = 0; ii < this->m_NumberOfCells; ++ii)
      {
        ++indInput; // ignore the cell type
        auto numberOfPoints = static_cast<unsigned int>(input[indInput++]);
        output[indOutput++] = static_cast<TOutput>(numberOfPoints);
        for (unsigned int jj = 0; jj < numberOfPoints; ++jj)
        {
          output[indOutput++] = static_cast<TOutput>(input[indInput++]);
        }
      }
    }
  }
 
  template <typename T>
  void
  WriteCellsAsAscii(T * buffer, std::ofstream & outputFile)
  {
    SizeValueType index = 0;
 
    for (SizeValueType ii = 0; ii < this->m_NumberOfCells; ++ii)
    {
      ++index;
      auto numberOfCellPoints = static_cast<unsigned int>(buffer[index++]);
      outputFile << numberOfCellPoints << "  ";
 
      for (unsigned int jj = 0; jj < numberOfCellPoints; ++jj)
      {
        outputFile << buffer[index++] << "  ";
      }
 
      outputFile << '\n';
    }
  }
 
  template <typename TOutput, typename TInput>
  void
  WriteCellsAsBinary(TInput * buffer, std::ofstream & outputFile)
  {
    const auto data = make_unique_for_overwrite<TOutput[]>(m_CellBufferSize - this->m_NumberOfCells);
 
    ReadCellsBuffer(buffer, data.get());
    WriteBufferAsBinary<TOutput>(data.get(), outputFile, m_CellBufferSize - this->m_NumberOfCells);
  }
 
protected:
  OFFMeshIO();
  ~OFFMeshIO() override;
 
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
  void
  OpenFile();
 
  void
  CloseFile();
 
private:
  std::ifstream    m_InputFile{};
  StreamOffsetType m_PointsStartPosition{}; // file position for points relative to std::ios::beg
  bool             m_TriangleCellType{};    // if all cells are triangle it is true. otherwise, it is false.
};
} // end namespace itk
 
#endif