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

  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();
  vtkTypeMacro(vtkImageAppend,vtkThreadedImageAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Replace one of the input connections with a new input.  You can
  // only replace input connections that you previously created with
  // AddInputConnection() or, in the case of the first input,
  // with SetInputConnection().
  virtual void ReplaceNthInputConnection(int idx, vtkAlgorithmOutput* input);

  // Description:
  // Set an Input of this filter.  This method is only for support of
  // old-style pipeline connections.  When writing new code you should
  // use SetInputConnection(), AddInputConnection(), and
  // ReplaceNthInputConnection() instead.
  void SetInput(int num, vtkDataObject *input);
  void SetInput(vtkDataObject *input) { this->SetInput(0, input); };

  // Description:
  // Get one input to this filter. This method is only for support of
  // old-style pipeline connections.  When writing new code you should
  // use vtkAlgorithm::GetInputConnection(0, num).
  vtkDataObject *GetInput(int num);
  vtkDataObject *GetInput() { return this->GetInput(0); };

  // Description:
  // Get the number of inputs to this filter. This method is only for
  // support of old-style pipeline connections.  When writing new code
  // you should use vtkAlgorithm::GetNumberOfInputConnections(0).
  int GetNumberOfInputs() { return this->GetNumberOfInputConnections(0); };

  // 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);

  // overridden to allocate all of the output arrays, not just active scalars
  virtual void AllocateOutputData(vtkImageData *out,
                                  int *uExtent);
  virtual vtkImageData *AllocateOutputData(vtkDataObject *out);

  // overridden to prevent shallow copies across, since we have to do it elementwise
  virtual void CopyAttributeData(vtkImageData *in, vtkImageData *out,
                                 vtkInformationVector** inputVector);


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

#endif




