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

  Program:   Visualization Toolkit
  Module:    vtkPNMWriter.cxx
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 1993-2002 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.

=========================================================================*/
#include "vtkPNMWriter.h"

#include "vtkObjectFactory.h"
#include "vtkImageData.h"

vtkCxxRevisionMacro(vtkPNMWriter, "1.20");
vtkStandardNewMacro(vtkPNMWriter);

#ifdef write
#undef write
#endif

#ifdef close
#undef close
#endif

void vtkPNMWriter::WriteFileHeader(ofstream *file, vtkImageData *cache)
{
  int min1, max1, min2, max2, min3, max3;
  int bpp;
  
  // Find the length of the rows to write.
  cache->GetWholeExtent(min1, max1, min2, max2, min3, max3);
  bpp = cache->GetNumberOfScalarComponents();
  
  // spit out the pnm header
  if (bpp == 1)
    {
    *file << "P5\n";
    *file << "# pgm file written by the visualization toolkit\n";
    *file << (max1 - min1 + 1) << " " << (max2 - min2 + 1) << "\n255\n";
    }
  else 
    {
    *file << "P6\n";
    *file << "# ppm file written by the visualization toolkit\n";
    *file << (max1 - min1 + 1) << " " << (max2 - min2 + 1) << "\n255\n";
    }
}


void vtkPNMWriter::WriteFile(ofstream *file, vtkImageData *data,
                             int extent[6])
{
  int idx0, idx1, idx2;
  int rowLength; // in bytes
  void *ptr;
  unsigned long count = 0;
  unsigned long target;
  float progress = this->Progress;
  float area;
  int *wExtent;
  
  // Make sure we actually have data.
  if ( !data->GetPointData()->GetScalars())
    {
    vtkErrorMacro(<< "Could not get data from input.");
    return;
    }

  // take into consideration the scalar type
  switch (data->GetScalarType())
    {
    case VTK_UNSIGNED_CHAR:
      rowLength = sizeof(unsigned char); 
      break;
    default:
      vtkErrorMacro("PNMWriter only accepts unsigned char scalars!");
      return; 
    }
  rowLength *= data->GetNumberOfScalarComponents();

  wExtent = this->GetInput()->GetWholeExtent();
  area = static_cast<float>(((extent[5] - extent[4] + 1)*(extent[3] - extent[2] + 1)*
                             (extent[1] - extent[0] + 1))) / 
         static_cast<float>(((wExtent[5] -wExtent[4] + 1)*(wExtent[3] -wExtent[2] + 1)*
                             (wExtent[1] -wExtent[0] + 1)));
    
  target = (unsigned long)((extent[5]-extent[4]+1)*
                           (extent[3]-extent[2]+1)/(50.0*area));
  target++;

  for (idx2 = extent[4]; idx2 <= extent[5]; ++idx2)
    {
    for (idx1 = extent[3]; idx1 >= extent[2]; idx1--)
      {
      if (!(count%target))
        {
        this->UpdateProgress(progress + count/(50.0*target));
        }
      count++;
      for (idx0 = extent[0]; idx0 <= extent[1]; idx0++)
        {
        ptr = data->GetScalarPointer(idx0, idx1, idx2);
        if ( ! file->write((char *)ptr, rowLength))
          {
          vtkErrorMacro("WriteFile: write failed");
          file->close();
          delete file;
          }
        }
      }
    }
}

//----------------------------------------------------------------------------
void vtkPNMWriter::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);
}
