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

  Program:   Visualization Toolkit
  Module:    vtkImageAppend.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 vtkImageAppend - Collects data from multiple inputs into one image.
// .SECTION Description
// vtkImageAppend takes the components from multiple inputs and merges
// them into one output. The output images are append along the "AppendAxis".
// Except for the append axis, all inputs must have the same extent.  
// All inputs must have the same number of scalar components.  
// A future extension might be to pad or clip inputs to have the same extent.
// The output has the same origin and spacing as the first input.
// The origin and spacing of all other inputs are ignored.  All inputs
// must have the same scalar type.


#ifndef __vtkImageAppend_h
#define __vtkImageAppend_h


#include "vtkThreadedImageAlgorithm.h"

class VTK_IMAGING_EXPORT vtkImageAppend : public vtkThreadedImageAlgorithm
{
public:
  static vtkImageAppend *New();
  vtkTypeRevisionMacro(vtkImageAppend,vtkThreadedImageAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);
  
  // Description:
  // This axis is expanded to hold the multiple images.  
  // The default AppendAxis is the X axis.
  // If you want to create a volue from a series of XY images, then you should
  // set the AppendAxis to 2 (Z axis).
  vtkSetMacro(AppendAxis, int);
  vtkGetMacro(AppendAxis, int);
  
  // Description:
  // By default "PreserveExtents" is off and the append axis is used.  
  // When "PreseveExtents" is on, the extent of the inputs is used to 
  // place the image in the output.  The whole extent of the output is 
  // the union of the input whole extents.  Any portion of the 
  // output not covered by the inputs is set to zero.  The origin and 
  // spacing is taken from the first input.
  vtkSetMacro(PreserveExtents, int);
  vtkGetMacro(PreserveExtents, int);
  vtkBooleanMacro(PreserveExtents, int);

protected:
  vtkImageAppend();
  ~vtkImageAppend();

  int PreserveExtents;
  int AppendAxis;
  // Array holds the AppendAxisExtent shift for each input.
  int *Shifts;

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

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

  void ThreadedRequestData (vtkInformation* request,
                            vtkInformationVector** inputVector,
                            vtkInformationVector* outputVector,
                            vtkImageData ***inData, vtkImageData **outData,
                            int ext[6], int id);

  // see vtkAlgorithm for docs.
  virtual int FillInputPortInformation(int, vtkInformation*);

  void InitOutput(int outExt[6], vtkImageData *outData);

  void InternalComputeInputUpdateExtent(
    int *inExt, int *outExt, int *inWextent, int whichInput);
  
private:
  vtkImageAppend(const vtkImageAppend&);  // Not implemented.
  void operator=(const vtkImageAppend&);  // Not implemented.
};

#endif




