dox/VolumeRendering/vtkVolumeRayCastSpaceLeapingImageFilter.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkFixedPointVolumeRayCastMapper.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.

=========================================================================*/
#ifndef __vtkVolumeRayCastSpaceLeapingImageFilter_h
#define __vtkVolumeRayCastSpaceLeapingImageFilter_h

#include "vtkThreadedImageAlgorithm.h"

class vtkDataArray;

class VTK_VOLUMERENDERING_EXPORT vtkVolumeRayCastSpaceLeapingImageFilter : public vtkThreadedImageAlgorithm
{
public:
  vtkTypeMacro(vtkVolumeRayCastSpaceLeapingImageFilter,vtkThreadedImageAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkVolumeRayCastSpaceLeapingImageFilter *New();


  virtual void SetCurrentScalars( vtkDataArray * );
  vtkGetObjectMacro( CurrentScalars, vtkDataArray );


  vtkSetMacro( IndependentComponents, int );
  vtkGetMacro( IndependentComponents, int );


  vtkSetMacro( ComputeGradientOpacity, int );
  vtkGetMacro( ComputeGradientOpacity, int );
  vtkBooleanMacro( ComputeGradientOpacity, int );


  vtkSetMacro( ComputeMinMax, int );
  vtkGetMacro( ComputeMinMax, int );
  vtkBooleanMacro( ComputeMinMax, int );


  vtkSetMacro( UpdateGradientOpacityFlags, int );
  vtkGetMacro( UpdateGradientOpacityFlags, int );
  vtkBooleanMacro( UpdateGradientOpacityFlags, int );
  

  unsigned long GetLastMinMaxBuildTime()
    { return LastMinMaxBuildTime.GetMTime(); }


  unsigned long GetLastMinMaxFlagTime()
    { return LastMinMaxFlagTime.GetMTime(); }


  vtkSetVector4Macro( TableShift, float );
  vtkGetVector4Macro( TableShift, float );
  vtkSetVector4Macro( TableScale, float );
  vtkGetVector4Macro( TableScale, float );
  vtkSetVector4Macro( TableSize,  int   );
  vtkGetVector4Macro( TableSize,  int   );

  int GetNumberOfIndependentComponents();

  unsigned short * GetMinMaxVolume( int dims[4] );

  virtual void SetCache(vtkImageData * imageCache);


  static void ComputeInputExtentsForOutput( int inExt[6],
      unsigned int inDim[3], int outExt[6], vtkImageData *inData );


  unsigned short * GetMinNonZeroScalarIndex();
  unsigned char  * GetMinNonZeroGradientMagnitudeIndex();

  //BTX

  void SetGradientMagnitude( unsigned char ** gradientMagnitude );
  unsigned char **GetGradientMagnitude();


  void SetScalarOpacityTable( int c, unsigned short * t);
  void SetGradientOpacityTable( int c, unsigned short * t );
  //ETX

  unsigned long ComputeOffset(int ext[6], int wholeExt[6], int nComponents);

  //BTX
  // This method helps debug. It writes out a specific component of the
  // computed min-max-volume structure
  //static void WriteMinMaxVolume( int component, unsigned short *minMaxVolume,
  //                           int minMaxVolumeSize[4], const char *filename );
  //ETX

protected:
  vtkVolumeRayCastSpaceLeapingImageFilter();
  ~vtkVolumeRayCastSpaceLeapingImageFilter();

  int               IndependentComponents;
  vtkTimeStamp      LastMinMaxBuildTime;
  vtkTimeStamp      LastMinMaxFlagTime;
  vtkDataArray   *  CurrentScalars;
  float             TableShift[4];
  float             TableScale[4];
  int               TableSize[4];
  int               ComputeGradientOpacity;
  int               ComputeMinMax;
  int               UpdateGradientOpacityFlags;
  unsigned short *  MinNonZeroScalarIndex;
  unsigned char  *  MinNonZeroGradientMagnitudeIndex;
  unsigned char  ** GradientMagnitude;
  unsigned short  * ScalarOpacityTable[4];
  unsigned short  * GradientOpacityTable[4];
  vtkImageData    * Cache;


  void InternalRequestUpdateExtent(int *, int*);


  virtual int RequestUpdateExtent(vtkInformation *,
                                  vtkInformationVector **,
                                  vtkInformationVector *);
  void ThreadedRequestData(       vtkInformation *request,
                                  vtkInformationVector **inputVector,
                                  vtkInformationVector *outputVector,
                                  vtkImageData ***inData,
                                  vtkImageData **outData,
                                  int outExt[6], int id);
  virtual int RequestData(        vtkInformation* request,
                                  vtkInformationVector** inputVector,
                                  vtkInformationVector* outputVector);
  virtual int RequestInformation( vtkInformation *,
                                  vtkInformationVector**,
                                  vtkInformationVector *);

  void ComputeFirstNonZeroOpacityIndices();


  void FillScalarOpacityFlags(
      vtkImageData *minMaxVolume, int outExt[6] );


  void FillScalarAndGradientOpacityFlags(
      vtkImageData *minMaxVolume, int outExt[6] );


  virtual void AllocateOutputData( vtkImageData *out, int *uExtent );
  virtual vtkImageData *AllocateOutputData(vtkDataObject *out);
  
private:
  vtkVolumeRayCastSpaceLeapingImageFilter(const vtkVolumeRayCastSpaceLeapingImageFilter&);  // Not implemented.
  void operator=(const vtkVolumeRayCastSpaceLeapingImageFilter&);  // Not implemented.
};

#endif

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