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

  Program:   Visualization Toolkit
  Module:    vtkImageResample.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$
  Thanks:    Thanks to C. Charles Law who developed this class.

Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
// .NAME vtkImageResample - Resamples an image to be larger or smaller.
// .SECTION Description
// This filter produces an output with different spacing (and extent)
// than the input.  Linear interpolation can be used to resample the data.
// The Output spacing can be set explicitly or relative to input spacing
// with the SetAxisMagnificationFactor method.


#ifndef __vtkImageResample_h
#define __vtkImageResample_h


#include "vtkImageToImageFilter.h"

class VTK_EXPORT vtkImageResample : public vtkImageToImageFilter
{
public:
  static vtkImageResample *New();
  vtkTypeMacro(vtkImageResample,vtkImageToImageFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Set desired spacing.  
  // Zero is a reserved value indicating spacing has not been set.
  void SetAxisOutputSpacing(int axis, float spacing);
  
  // Description:
  // Set/Get Magnification factors.
  // Zero is a reserved value indicating values have not been computed.
  void SetAxisMagnificationFactor(int axis, float factor);
  float GetAxisMagnificationFactor(int axis);

  // Description:
  // Turn interpolation on and off (pixel replication is used when off).
  vtkSetMacro(Interpolate,int);
  vtkGetMacro(Interpolate,int);
  vtkBooleanMacro(Interpolate,int);
  
  // Description:
  // Dimensionality is the number of axes which are considered during
  // execution. To process images dimensionality would be set to 2.
  // This has the same effect as setting the output spacing of the third
  // axis to 1.0
  vtkSetMacro(Dimensionality,int);
  vtkGetMacro(Dimensionality,int);

protected:
  vtkImageResample();
  ~vtkImageResample() {};
  vtkImageResample(const vtkImageResample&) {};
  void operator=(const vtkImageResample&) {};

  float MagnificationFactors[3];
  float OutputSpacing[3];
  int Interpolate;
  int Dimensionality;
  
  void ComputeInputUpdateExtent(int inExt[6], int outExt[6]);
  void ExecuteInformation(vtkImageData *inData, vtkImageData *outData);
  void ExecuteInformation(){this->vtkImageToImageFilter::ExecuteInformation();};
  void ThreadedExecute(vtkImageData *inData, vtkImageData *outData,
		       int extent[6], int id);
};

#endif
