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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkMetaImageReader.h,v $

  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 vtkMetaImageReader - read binary UNC meta image data
// .SECTION Description
// One of the formats for which a reader is already available in the toolkit is
// the MetaImage file format. This is a fairly simple yet powerful format
// consisting of a text header and a binary data section. The following
// instructions describe how you can write a MetaImage header for the data that
// you download from the BrainWeb page.
//
// The minimal structure of the MetaImage header is the following:
//
//    NDims = 3
//    DimSize = 181 217 181
//    ElementType = MET_UCHAR
//    ElementSpacing = 1.0 1.0 1.0
//    ElementByteOrderMSB = False
//    ElementDataFile = brainweb1.raw
//
//    * NDims indicate that this is a 3D image. ITK can handle images of
//      arbitrary dimension.
//    * DimSize indicates the size of the volume in pixels along each
//      direction.
//    * ElementType indicate the primitive type used for pixels. In this case
//      is "unsigned char", implying that the data is digitized in 8 bits /
//      pixel.
//    * ElementSpacing indicates the physical separation between the center of
//      one pixel and the center of the next pixel along each direction in space.
//      The units used are millimeters.
//    * ElementByteOrderMSB indicates is the data is encoded in little or big
//      endian order. You might want to play with this value when moving data
//      between different computer platforms.
//    * ElementDataFile is the name of the file containing the raw binary data
//      of the image. This file must be in the same directory as the header. 
//
// MetaImage headers are expected to have extension: ".mha" or ".mhd"
//
// Once you write this header text file, it should be possible to read the
// image into your ITK based application using the itk::FileIOToImageFilter
// class.

// .SECTION Caveats
// 

// .SECTION See Also
// vtkImageReader

#ifndef __vtkMetaImageReader_h
#define __vtkMetaImageReader_h

#include "vtkImageReader.h"

class VTK_IO_EXPORT vtkMetaImageReader : public vtkImageReader
{
public:
  vtkTypeRevisionMacro(vtkMetaImageReader,vtkImageReader);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Construct object with FlipNormals turned off and Normals set to true.
  static vtkMetaImageReader *New();

  // Description:
  // Specify file name of meta file
  virtual void SetFileName(const char* fname);
  virtual char* GetFileName() { return this->MHDFileName; }

  // Description:
  // Test whether the file with the given name can be read by this
  // reader.
  virtual int CanReadFile(const char* name);

protected:
  vtkMetaImageReader();
  ~vtkMetaImageReader();

  virtual int RequestInformation(vtkInformation* request,
                                 vtkInformationVector** inputVector,
                                 vtkInformationVector* outputVector);

  int GetFileInformation(const char* fname, int populate);

  vtkSetStringMacro(MHDFileName);
  char* MHDFileName;

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

#endif