vtkImageBlend.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkImageBlend.h,v $

  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 __vtkImageBlend_h
#define __vtkImageBlend_h


#include "vtkThreadedImageAlgorithm.h"

class vtkImageStencilData;

#define VTK_IMAGE_BLEND_MODE_NORMAL    0
#define VTK_IMAGE_BLEND_MODE_COMPOUND 1

class VTK_IMAGING_EXPORT vtkImageBlend : public vtkThreadedImageAlgorithm
{
public:
  static vtkImageBlend *New();
  vtkTypeRevisionMacro(vtkImageBlend,vtkThreadedImageAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);


  void SetInput(int num, vtkDataObject *input);
  void SetInput(vtkDataObject *input) { this->SetInput(0, input); };


  vtkDataObject *GetInput(int num);
  vtkDataObject *GetInput() { return this->GetInput(0); };

  int GetNumberOfInputs() { return this->GetNumberOfInputConnections(0); };


  void SetOpacity(int idx, double opacity);
  double GetOpacity(int idx);


  void SetStencil(vtkImageStencilData *stencil);
  vtkImageStencilData *GetStencil();


  vtkSetClampMacro(BlendMode,int,
                   VTK_IMAGE_BLEND_MODE_NORMAL, 
                   VTK_IMAGE_BLEND_MODE_COMPOUND );
  vtkGetMacro(BlendMode,int);
  void SetBlendModeToNormal() 
        {this->SetBlendMode(VTK_IMAGE_BLEND_MODE_NORMAL);};
  void SetBlendModeToCompound() 
        {this->SetBlendMode(VTK_IMAGE_BLEND_MODE_COMPOUND);};
  const char *GetBlendModeAsString(void);


  vtkSetMacro(CompoundThreshold,double);
  vtkGetMacro(CompoundThreshold,double);

protected:
  vtkImageBlend();
  ~vtkImageBlend();

  virtual int RequestUpdateExtent(vtkInformation *, 
                                  vtkInformationVector **,
                                  vtkInformationVector *);

  void InternalComputeInputUpdateExtent(int inExt[6], int outExt[6],
                                        int inWExtent[6]);

  

  virtual int RequestInformation (vtkInformation *, 
                                  vtkInformationVector **,
                                  vtkInformationVector *);

  void ThreadedRequestData (vtkInformation* request,
                            vtkInformationVector** inputVector,
                            vtkInformationVector* outputVector,
                            vtkImageData ***inData, vtkImageData **outData,
                            int ext[6], int id);

  // see vtkAlgorithm for docs.
  virtual int FillInputPortInformation(int, vtkInformation*);

  // see vtkAlgorithm for docs.
  virtual int RequestData(vtkInformation* request,
                          vtkInformationVector** inputVector,
                          vtkInformationVector* outputVector);
  
  double *Opacity;
  int OpacityArrayLength;
  int BlendMode;
  double CompoundThreshold;
  int DataWasPassed;  

private:
  vtkImageBlend(const vtkImageBlend&);  // Not implemented.
  void operator=(const vtkImageBlend&);  // Not implemented.
};

inline const char *vtkImageBlend::GetBlendModeAsString()
{
  switch (this->BlendMode)
    {
    case VTK_IMAGE_BLEND_MODE_NORMAL:
      return "Normal";
    case VTK_IMAGE_BLEND_MODE_COMPOUND:
      return "Compound";
    default:
      return "Unknown Blend Mode";
    }
}


#endif

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