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

  Program:   Visualization Toolkit
  Module:    vtkImageStencilSource.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 vtkImageStencilSource - generate an image stencil
// .SECTION Description
// vtkImageStencilSource is a superclass for filters that generate image
// stencils.  Given a clipping object such as a vtkImplicitFunction, it
// will set up a list of clipping extents for each x-row through the
// image data.  The extents for each x-row can be retrieved via the 
// GetNextExtent() method after the extent lists have been built
// with the BuildExtents() method.  For large images, using clipping
// extents is much more memory efficient (and slightly more time-efficient)
// than building a mask.  This class can be subclassed to allow clipping
// with objects other than vtkImplicitFunction.
// .SECTION see also
// vtkImplicitFunction vtkImageStencil vtkPolyDataToImageStencil

#ifndef __vtkImageStencilSource_h
#define __vtkImageStencilSource_h


#include "vtkImageStencilAlgorithm.h"

class vtkImageStencilData;
class vtkImageData;

class VTK_IMAGING_EXPORT vtkImageStencilSource :
  public vtkImageStencilAlgorithm
{
public:
  static vtkImageStencilSource *New();
  vtkTypeMacro(vtkImageStencilSource, vtkImageStencilAlgorithm);

  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Set a vtkImageData that has the Spacing, Origin, and
  // WholeExtent that will be used for the stencil.  This
  // input should be set to the image that you wish to
  // apply the stencil to.  If you use this method, then
  // any values set with the SetOutputSpacing, SetOutputOrigin,
  // and SetOutputWholeExtent methods will be ignored.
  virtual void SetInformationInput(vtkImageData*);
  vtkGetObjectMacro(InformationInput, vtkImageData);

  // Description:
  // Set the Origin to be used for the stencil.  It should be
  // set to the Origin of the image you intend to apply the
  // stencil to. The default value is (0,0,0).
  vtkSetVector3Macro(OutputOrigin, double);
  vtkGetVector3Macro(OutputOrigin, double);

  // Description:
  // Set the Spacing to be used for the stencil. It should be
  // set to the Spacing of the image you intend to apply the
  // stencil to. The default value is (1,1,1)
  vtkSetVector3Macro(OutputSpacing, double);
  vtkGetVector3Macro(OutputSpacing, double);

  // Description:
  // Set the whole extent for the stencil (anything outside
  // this extent will be considered to be "outside" the stencil).
  vtkSetVector6Macro(OutputWholeExtent, int);
  vtkGetVector6Macro(OutputWholeExtent, int);

  // Description:
  // Report object referenced by instances of this class.
  virtual void ReportReferences(vtkGarbageCollector*);

protected:
  vtkImageStencilSource();
  ~vtkImageStencilSource();

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

  vtkImageData *InformationInput;

  int OutputWholeExtent[6];
  double OutputOrigin[3];
  double OutputSpacing[3];

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

#endif