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

  Program:   Visualization Toolkit
  Module:    vtkImageStencil.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.

=========================================================================*/
// .NAME vtkImageStencil - combine images via a cookie-cutter operation
// .SECTION Description
// vtkImageStencil will combine two images together using a stencil.
// The stencil should be provided in the form of a vtkImageStencilData,


#ifndef __vtkImageStencil_h
#define __vtkImageStencil_h

#include "vtkThreadedImageAlgorithm.h"

class vtkImageStencilData;

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

  // Description:
  // Specify the stencil to use.  The stencil can be created
  // from a vtkImplicitFunction or a vtkPolyData.
  virtual void SetStencil(vtkImageStencilData *stencil);
  vtkImageStencilData *GetStencil();

  // Description:
  // Reverse the stencil.
  vtkSetMacro(ReverseStencil, int);
  vtkBooleanMacro(ReverseStencil, int);
  vtkGetMacro(ReverseStencil, int);

  // Description:
  // Set the second input.  This image will be used for the 'outside' of the
  // stencil.  If not set, the output voxels will be filled with
  // BackgroundValue instead.
  virtual void SetBackgroundInput(vtkImageData *input);
  vtkImageData *GetBackgroundInput();

  // Description:
  // Set the default output value to use when the second input is not set.
  void SetBackgroundValue(double val) {
    this->SetBackgroundColor(val,val,val,val); };
  double GetBackgroundValue() {
    return this->BackgroundColor[0]; };

  // Description:
  // Set the default color to use when the second input is not set.
  // This is like SetBackgroundValue, but for multi-component images.
  vtkSetVector4Macro(BackgroundColor, double);
  vtkGetVector4Macro(BackgroundColor, double);

protected:
  vtkImageStencil();
  ~vtkImageStencil();
  
  void ThreadedRequestData(vtkInformation *request,
                           vtkInformationVector **inputVector,
                           vtkInformationVector *outputVector,
                           vtkImageData ***inData, vtkImageData **outData,
                           int extent[6], int id);
  
  int ReverseStencil;
  double BackgroundColor[4];

  virtual int FillInputPortInformation(int, vtkInformation*);

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

#endif