/usr/include/vtk-6.3/vtkExtractCells.h is in libvtk6-dev 6.3.0+dfsg1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 | /*=========================================================================
  Program:   Visualization Toolkit
  Module:    vtkExtractCells.h
  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.
=========================================================================*/
/*----------------------------------------------------------------------------
 Copyright (c) Sandia Corporation
 See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.
----------------------------------------------------------------------------*/
// .NAME vtkExtractCells - subset a vtkDataSet to create a vtkUnstructuredGrid
//
// .SECTION Description
//    Given a vtkDataSet and a list of cell Ids, create a vtkUnstructuredGrid
//    composed of these cells.  If the cell list is empty when vtkExtractCells
//    executes, it will set up the ugrid, point and cell arrays, with no points,
//    cells or data.
#ifndef vtkExtractCells_h
#define vtkExtractCells_h
#include "vtkFiltersExtractionModule.h" // For export macro
#include "vtkUnstructuredGridAlgorithm.h"
class vtkIdList;
class vtkExtractCellsSTLCloak;
class VTKFILTERSEXTRACTION_EXPORT vtkExtractCells : public vtkUnstructuredGridAlgorithm
{
public:
  vtkTypeMacro(vtkExtractCells, vtkUnstructuredGridAlgorithm);
  virtual void PrintSelf(ostream &os, vtkIndent indent);
  static vtkExtractCells *New();
  // Description:
  // Set the list of cell IDs that the output vtkUnstructuredGrid
  // will be composed of.  Replaces any other cell ID list supplied
  // so far.  (Set to NULL to free memory used by cell list.)
  void SetCellList(vtkIdList *l);
  // Description:
  // Add the supplied list of cell IDs to those that will be included
  // in the output vtkUnstructuredGrid.
  void AddCellList(vtkIdList *l);
  // Description:
  // Add this range of cell IDs to those that will be included
  // in the output vtkUnstructuredGrid.
  void AddCellRange(vtkIdType from, vtkIdType to);
protected:
  virtual int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
  virtual int FillInputPortInformation(int port, vtkInformation *info);
  vtkExtractCells();
  ~vtkExtractCells();
private:
  void Copy(vtkDataSet *input, vtkUnstructuredGrid *output);
  static vtkIdType findInSortedList(vtkIdList *idList, vtkIdType id);
  vtkIdList *reMapPointIds(vtkDataSet *grid);
  void CopyCellsDataSet(vtkIdList *ptMap, vtkDataSet *input,
                        vtkUnstructuredGrid *output);
  void CopyCellsUnstructuredGrid(vtkIdList *ptMap, vtkDataSet *input,
                                 vtkUnstructuredGrid *output);
  vtkExtractCellsSTLCloak *CellList;
  int SubSetUGridCellArraySize;
  char InputIsUgrid;
  vtkExtractCells(const vtkExtractCells&); // Not implemented
  void operator=(const vtkExtractCells&); // Not implemented
};
#endif
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