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 "vtkRenderingVolumeModule.h" // For export macro
#include "vtkThreadedImageAlgorithm.h"

class vtkDataArray;

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

  static vtkVolumeRayCastSpaceLeapingImageFilter *New();


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


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


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


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


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

  vtkMTimeType GetLastMinMaxBuildTime()
    { return LastMinMaxBuildTime.GetMTime(); }

  vtkMTimeType 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],
      int inDim[3], int outExt[6], vtkImageData *inData );


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


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


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

  vtkIdType ComputeOffset(const int ext[6], const int wholeExt[6],
      int nComponents);

  // 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 );

protected:
  vtkVolumeRayCastSpaceLeapingImageFilter();
  ~vtkVolumeRayCastSpaceLeapingImageFilter() override;

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


  void InternalRequestUpdateExtent(int *, int*);


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

  void ComputeFirstNonZeroOpacityIndices();

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

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


  void AllocateOutputData(vtkImageData *out,
                                  vtkInformation* outInfo,
                                  int *uExtent) override;
  vtkImageData *AllocateOutputData(vtkDataObject *out,
                                           vtkInformation *outInfo) override;

private:
  vtkVolumeRayCastSpaceLeapingImageFilter(const vtkVolumeRayCastSpaceLeapingImageFilter&) = delete;
  void operator=(const vtkVolumeRayCastSpaceLeapingImageFilter&) = delete;
};

#endif