/usr/include/paraview/vtkImageGradient.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 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79  | /*=========================================================================
  Program:   Visualization Toolkit
  Module:    vtkImageGradient.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 vtkImageGradient - Computes the gradient vector.
// .SECTION Description
// vtkImageGradient computes the gradient vector of an image.  The
// vector results are stored as scalar components. The Dimensionality
// determines whether to perform a 2d or 3d gradient. The default is
// two dimensional XY gradient.  OutputScalarType is always
// double. Gradient is computed using central differences.
#ifndef vtkImageGradient_h
#define vtkImageGradient_h
#include "vtkImagingGeneralModule.h" // For export macro
#include "vtkThreadedImageAlgorithm.h"
class VTKIMAGINGGENERAL_EXPORT vtkImageGradient : public vtkThreadedImageAlgorithm
{
public:
  static vtkImageGradient *New();
  vtkTypeMacro(vtkImageGradient,vtkThreadedImageAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);
  // Description:
  // Determines how the input is interpreted (set of 2d slices ...)
  vtkSetClampMacro(Dimensionality,int,2,3);
  vtkGetMacro(Dimensionality,int);
  // Description:
  // Get/Set whether to handle boundaries.  If enabled, boundary
  // pixels are treated as duplicated so that central differencing
  // works for the boundary pixels.  If disabled, the output whole
  // extent of the image is reduced by one pixel.
  vtkSetMacro(HandleBoundaries, int);
  vtkGetMacro(HandleBoundaries, int);
  vtkBooleanMacro(HandleBoundaries, int);
protected:
  vtkImageGradient();
  ~vtkImageGradient() {}
  int HandleBoundaries;
  int Dimensionality;
  virtual int RequestInformation (vtkInformation*,
                                  vtkInformationVector**,
                                  vtkInformationVector*);
  virtual int RequestUpdateExtent(vtkInformation*,
                                  vtkInformationVector**,
                                  vtkInformationVector*);
  virtual int RequestData(vtkInformation*,
                          vtkInformationVector**,
                          vtkInformationVector*);
  void ThreadedRequestData(vtkInformation*,
                           vtkInformationVector**,
                           vtkInformationVector*,
                           vtkImageData*** inData,
                           vtkImageData** outData,
                           int outExt[6],
                           int threadId);
private:
  vtkImageGradient(const vtkImageGradient&);  // Not implemented.
  void operator=(const vtkImageGradient&);  // Not implemented.
};
#endif
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