/usr/include/vtk-5.8/vtkOpenGLRayCastImageDisplayHelper.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 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78  | /*=========================================================================
  Program:   Visualization Toolkit
  Module:    vtkOpenGLRayCastImageDisplayHelper.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 vtkOpenGLRayCastImageDisplayHelper - OpenGL subclass that draws the image to the screen
// .SECTION Description
// This is the concrete implementation of a ray cast image display helper -
// a helper class responsible for drawing the image to the screen.
// .SECTION see also
// vtkRayCastImageDisplayHelper
#ifndef __vtkOpenGLRayCastImageDisplayHelper_h
#define __vtkOpenGLRayCastImageDisplayHelper_h
#include "vtkRayCastImageDisplayHelper.h"
class vtkVolume;
class vtkRenderer;
class vtkFixedPointRayCastImage;
class VTK_VOLUMERENDERING_EXPORT vtkOpenGLRayCastImageDisplayHelper : public vtkRayCastImageDisplayHelper
{
public:
  static vtkOpenGLRayCastImageDisplayHelper *New();
  vtkTypeMacro(vtkOpenGLRayCastImageDisplayHelper,vtkRayCastImageDisplayHelper);
  virtual void PrintSelf(ostream& os, vtkIndent indent);
  void RenderTexture( vtkVolume *vol, vtkRenderer *ren,
                      int imageMemorySize[2],
                      int imageViewportSize[2],
                      int imageInUseSize[2],
                      int imageOrigin[2],
                      float requestedDepth,
                      unsigned char *image );
  void RenderTexture( vtkVolume *vol, vtkRenderer *ren,
                      int imageMemorySize[2],
                      int imageViewportSize[2],
                      int imageInUseSize[2],
                      int imageOrigin[2],
                      float requestedDepth,
                      unsigned short *image );
  void RenderTexture( vtkVolume *vol, vtkRenderer *ren,
                      vtkFixedPointRayCastImage *image,
                      float requestedDepth );
protected:
  vtkOpenGLRayCastImageDisplayHelper();
  ~vtkOpenGLRayCastImageDisplayHelper();
  
  void RenderTextureInternal( vtkVolume *vol, vtkRenderer *ren,
                              int imageMemorySize[2],
                              int imageViewportSize[2],
                              int imageInUseSize[2],
                              int imageOrigin[2],
                              float requestedDepth,
                              int imageScalarType,
                              void *image );
private:
  vtkOpenGLRayCastImageDisplayHelper(const vtkOpenGLRayCastImageDisplayHelper&);  // Not implemented.
  void operator=(const vtkOpenGLRayCastImageDisplayHelper&);  // Not implemented.
};
#endif
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