/usr/include/vtk-5.8/vtkImageDotProduct.h is in libvtk5-dev 5.8.0-5.
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 | /*=========================================================================
  Program:   Visualization Toolkit
  Module:    vtkImageDotProduct.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 vtkImageDotProduct - Dot product of two vector images.
// .SECTION Description
// vtkImageDotProduct interprets the scalar components of two images
// as vectors and takes the dot product vector by vector (pixel by pixel).
#ifndef __vtkImageDotProduct_h
#define __vtkImageDotProduct_h
#include "vtkThreadedImageAlgorithm.h"
class VTK_IMAGING_EXPORT vtkImageDotProduct : public vtkThreadedImageAlgorithm
{
public:
  static vtkImageDotProduct *New();
  vtkTypeMacro(vtkImageDotProduct,vtkThreadedImageAlgorithm);
  // Description:
  // Set the two inputs to this filter
  virtual void SetInput1(vtkDataObject *in) { this->SetInput(0,in); }
  virtual void SetInput2(vtkDataObject *in) { this->SetInput(1,in); }
protected:
  vtkImageDotProduct();
  ~vtkImageDotProduct() {};
  virtual int RequestInformation (vtkInformation *, 
                                  vtkInformationVector **,
                                  vtkInformationVector *);
  
  virtual void ThreadedRequestData(vtkInformation *request, 
                                   vtkInformationVector **inputVector, 
                                   vtkInformationVector *outputVector,
                                   vtkImageData ***inData, 
                                   vtkImageData **outData,
                                   int extent[6], int threadId);
private:
  vtkImageDotProduct(const vtkImageDotProduct&);  // Not implemented.
  void operator=(const vtkImageDotProduct&);  // Not implemented.
};
#endif
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