/usr/include/paraview/vtkImageCheckerboard.h is in paraview-dev 5.0.1+dfsg1-4.
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  | /*=========================================================================
  Program:   Visualization Toolkit
  Module:    vtkImageCheckerboard.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.
=========================================================================*/
// .NAME vtkImageCheckerboard - show two images at once using a checkboard pattern
// .SECTION Description
//  vtkImageCheckerboard displays two images as one using a checkerboard
//  pattern. This filter can be used to compare two images. The
//  checkerboard pattern is controlled by the NumberOfDivisions
//  ivar. This controls the number of checkerboard divisions in the whole
//  extent of the image.
#ifndef vtkImageCheckerboard_h
#define vtkImageCheckerboard_h
#include "vtkImagingGeneralModule.h" // For export macro
#include "vtkThreadedImageAlgorithm.h"
class VTKIMAGINGGENERAL_EXPORT vtkImageCheckerboard : public vtkThreadedImageAlgorithm
{
public:
  static vtkImageCheckerboard *New();
  vtkTypeMacro(vtkImageCheckerboard,vtkThreadedImageAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);
  // Description:
  // Set/Get the number of divisions along each axis.
  vtkSetVector3Macro(NumberOfDivisions,int);
  vtkGetVectorMacro(NumberOfDivisions,int,3);
  // Description:
  // Set the two inputs to this filter
  virtual void SetInput1Data(vtkDataObject *in) { this->SetInputData(0,in); }
  virtual void SetInput2Data(vtkDataObject *in) { this->SetInputData(1,in); }
protected:
  vtkImageCheckerboard();
  ~vtkImageCheckerboard() {}
  virtual void ThreadedRequestData(vtkInformation *request,
                                   vtkInformationVector **inputVector,
                                   vtkInformationVector *outputVector,
                                   vtkImageData ***inData,
                                   vtkImageData **outData,
                                   int extent[6], int threadId);
  int NumberOfDivisions[3];
private:
  vtkImageCheckerboard(const vtkImageCheckerboard&);  // Not implemented.
  void operator=(const vtkImageCheckerboard&);  // Not implemented.
};
#endif
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