---

Imaging/vtkImageBlend.h

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

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

  Copyright (c) 1993-2002 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 "vtkImageMultipleInputFilter.h"

class vtkImageStencilData;

#define VTK_IMAGE_BLEND_MODE_NORMAL    0
#define VTK_IMAGE_BLEND_MODE_COMPOUND 1

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


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


  virtual void SetStencil(vtkImageStencilData*);
  vtkGetObjectMacro(Stencil, vtkImageStencilData);


  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,float);
  vtkGetMacro(CompoundThreshold,float);

protected:
  vtkImageBlend();
  ~vtkImageBlend();

  void ComputeInputUpdateExtent(int inExt[6], int outExt[6],
                                int whichInput);

  void ExecuteInformation() {
    this->vtkImageMultipleInputFilter::ExecuteInformation(); };

  void ExecuteInformation(vtkImageData **, vtkImageData *);

  void ThreadedExecute(vtkImageData **inDatas, 
                       vtkImageData *outData,
                       int extent[6], 
                       int id);

  void ExecuteData(vtkDataObject *output);
  
  vtkImageStencilData *Stencil;
  double *Opacity;
  int OpacityArrayLength;
  int BlendMode;
  float 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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