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

  Program:   Visualization Toolkit
  Module:    vtkImageIterator.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.

=========================================================================*/
/**
 * @class   vtkImageIterator
 * @brief   a simple image iterator
 *
 * This is a simple image iterator that can be used to iterate over an
 * image. This should be used internally by Filter writers.
 *
 * @sa
 * vtkImageData vtkImageProgressIterator
*/

#ifndef vtkImageIterator_h
#define vtkImageIterator_h

#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkSystemIncludes.h"
class vtkImageData;

template<class DType>
class VTKCOMMONDATAMODEL_EXPORT vtkImageIterator
{
public:
  typedef DType *SpanIterator;

  /**
   * Default empty constructor, useful only when creating an array of iterators
   * You need to call Initialize afterward
   */
  vtkImageIterator();

  /**
   * Create an image iterator for a given image data and a given extent
   */
  vtkImageIterator(vtkImageData *id, int *ext);

  /**
   * Initialize the image iterator for a given image data, and given extent
   */
  void Initialize(vtkImageData *id, int *ext);

  /**
   * Move the iterator to the next span
   */
  void NextSpan();

  /**
   * Return an iterator (pointer) for the span
   */
  SpanIterator BeginSpan()
  {
    return this->Pointer;
  }

  /**
   * Return an iterator (pointer) for the end of the span
   */
  SpanIterator EndSpan()
  {
    return this->SpanEndPointer;
  }

  /**
   * Test if the end of the extent has been reached
   */
  int IsAtEnd()
  {
    return (this->Pointer >= this->EndPointer);
  }

protected:
  DType *Pointer;
  DType *SpanEndPointer;
  DType *SliceEndPointer;
  DType *EndPointer;
  vtkIdType    Increments[3];
  vtkIdType    ContinuousIncrements[3];
};

#ifndef vtkImageIterator_cxx
#ifdef _MSC_VER
#pragma warning (push)
// The following is needed when the vtkImageIterator is declared
// dllexport and is used from another class in vtkCommonCore
#pragma warning (disable: 4910) // extern and dllexport incompatible
#endif
vtkExternTemplateMacro(
  extern template class VTKCOMMONDATAMODEL_EXPORT vtkImageIterator
)
#ifdef _MSC_VER
#pragma warning (pop)
#endif
#endif

#endif
// VTK-HeaderTest-Exclude: vtkImageIterator.h
