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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkImageMask.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.

=========================================================================*/
// .NAME vtkImageMask - Combines a mask and an image.
// .SECTION Description
// vtkImageMask combines a mask with an image.  Non zero mask
// implies the output pixel will be the same as the image.
// If a mask pixel is zero,  the the output pixel
// is set to "MaskedValue".  The filter also has the option to pass
// the mask through a boolean not operation before processing the image.
// This reverses the passed and replaced pixels.
// The two inputs should have the same "WholeExtent".
// The mask input should be unsigned char, and the image scalar type
// is the same as the output scalar type.


#ifndef __vtkImageMask_h
#define __vtkImageMask_h


#include "vtkThreadedImageAlgorithm.h"

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

  // Description:
  // SetGet the value of the output pixel replaced by mask.
  void SetMaskedOutputValue(int num, double *v);
  void SetMaskedOutputValue(double v) {this->SetMaskedOutputValue(1, &v);}
  void SetMaskedOutputValue(double v1, double v2) 
    {double v[2]; v[0]=v1; v[1]=v2; this->SetMaskedOutputValue(2, v);}
  void SetMaskedOutputValue(double v1, double v2, double v3) 
    {double v[3]; v[0]=v1; v[1]=v2; v[2]=v3; this->SetMaskedOutputValue(3, v);}
  double *GetMaskedOutputValue() {return this->MaskedOutputValue;}
  int GetMaskedOutputValueLength() {return this->MaskedOutputValueLength;}

  // Description:
  // Set/Get the alpha blending value for the mask
  // The input image is assumed to be at alpha = 1.0
  // and the mask image uses this alpha to blend using
  // an over operator.
  vtkSetClampMacro ( MaskAlpha, double, 0.0, 1.0 );
  vtkGetMacro ( MaskAlpha, double );

  // Description:
  // Set the input to be masked.
  void SetImageInput(vtkImageData *in);

  // Description:
  // Set the mask to be used.
  void SetMaskInput(vtkImageData *in);
  
  // Description:
  // When Not Mask is on, the mask is passed through a boolean not
  // before it is used to mask the image.  The effect is to pass the
  // pixels where the input mask is zero, and replace the pixels
  // where the input value is non zero.
  vtkSetMacro(NotMask,int);
  vtkGetMacro(NotMask,int);
  vtkBooleanMacro(NotMask, int);
  
  // Description:
  // Set the two inputs to this filter
  virtual void SetInput1(vtkDataObject *in) { this->SetInput(0,in); }
  virtual void SetInput2(vtkDataObject *in) { this->SetInput(1,in); }

protected:
  vtkImageMask();
  ~vtkImageMask();

  double *MaskedOutputValue;
  int MaskedOutputValueLength;
  int NotMask;
  double MaskAlpha;
  
  virtual int RequestInformation (vtkInformation *, 
                                  vtkInformationVector **,
                                  vtkInformationVector *);
  
 
  virtual void ThreadedRequestData(vtkInformation *request, 
                                   vtkInformationVector **inputVector, 
                                   vtkInformationVector *outputVector,
                                   vtkImageData ***inData, 
                                   vtkImageData **outData,
                                   int extent[6], int threadId);

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

#endif