Method ReadMeshSimple

IO/Legacy/vtkPolyDataReader.cxx:43–284

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//------------------------------------------------------------------------------
int vtkPolyDataReader::ReadMeshSimple(const std::string& fname, vtkDataObject* doOutput)
{
  vtkIdType numPts = 0;
  char line[256];
  vtkIdType npts, size = 0, ncells;
  vtkPolyData* output = vtkPolyData::SafeDownCast(doOutput);

  // Helper function to handle legacy cell data fallback:
  auto readCellArray = [&](vtkSmartPointer<vtkCellArray>& cellArray) -> bool
  {
    if (this->FileMajorVersion >= 5)
    { // Cells are written as offsets + connectivity arrays:
      return this->ReadCells(cellArray) != 0;
    }
    else
    { // Import cells from legacy format:
      if (!(this->Read(&ncells) && this->Read(&size)))
      {
        return false;
      }

      std::size_t connSize = static_cast<std::size_t>(size);
      std::vector<int> tempArray(connSize);
      std::vector<vtkIdType> idArray(connSize);

      if (!this->ReadCellsLegacy(size, tempArray.data()))
      {
        this->CloseVTKFile();
        return false;
      }

      // Convert to id type
      for (std::size_t connIdx = 0; connIdx < connSize; connIdx++)
      {
        idArray[connIdx] = static_cast<vtkIdType>(tempArray[connIdx]);
      }

      cellArray = vtkSmartPointer<vtkCellArray>::New();
      cellArray->ImportLegacyFormat(idArray.data(), size);
      return true;
    } // end legacy cell read
  };

  vtkDebugMacro(<< "Reading vtk polygonal data...");

  if (!(this->OpenVTKFile(fname.c_str())) || !this->ReadHeader(fname.c_str()))
  {
    return 1;
  }
  //
  // Read polygonal data specific stuff
  //
  if (!this->ReadString(line))
  {
    vtkErrorMacro(<< "Data file ends prematurely!");
    this->CloseVTKFile();
    return 1;
  }