/**************************************************************************
THIS IS A MODIFIED VERSION OF THE vtkTIFFReader class.
This version fixes problems with the original vtkTIFFReader class
related to tiles and floating-point pixels.

-Maik
***************************************************************************/

/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkTIFFReaderX.cxx,v $
  Language:  C++
  Date:      $Date: 2005/02/04 18:35:43 $
  Version:   $Revision: 1.6 $
 
 
Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.
 
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
 
 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
 
 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
 
 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.
 
 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
=========================================================================*/
#include "vtkTIFFReaderX.h"

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

#include <sys/stat.h>

extern "C" {
  #include <tiffio.h>
}
template <typename T>
void doNothing(vtkTIFFReaderX *self, int a, int b) {
  T rt;
  vtkIdType ie = self->InternalExtents[0];
}
//-------------------------------------------------------------------------
vtkStandardNewMacro(vtkTIFFReaderX);
vtkCxxRevisionMacro(vtkTIFFReaderX, "$Revision: 1.6 $");

class vtkTIFFReaderXInternal {
public:
  vtkTIFFReaderXInternal();
  int Initialize();
  void Clean();
  int CanRead();
  int Open( const char *filename );
  TIFF *Image;
  unsigned int Width;
  unsigned int Height;
  unsigned short SamplesPerPixel;
  unsigned short Compression;
  unsigned short BitsPerSample;
  unsigned short Photometrics;
  unsigned short PlanarConfig;
  unsigned long int TileDepth;
  static void ErrorHandler(const char* module, const char* fmt, va_list ap);
};


extern "C" {
  void vtkTIFFReaderXInternalErrorHandler(const char* vtkNotUsed(module),
                                          const char* vtkNotUsed(fmt),
                                          va_list vtkNotUsed(ap)) {
    // Do nothing
    // Ignore errors
  }
}

int vtkTIFFReaderXInternal::Open( const char *filename ) {
  this->Clean();
  struct stat fs;
  if ( stat(filename, &fs) ) {
    return 0;
  }
  this->Image = TIFFOpen(filename, "r");
  if ( !this->Image) {
    this->Clean();
    return 0;
  }
  if ( !this->Initialize() ) {
    this->Clean();
    return 0;
  }
  return 1;
}

void vtkTIFFReaderXInternal::Clean() {
  if ( this->Image ) {
    TIFFClose(this->Image);
  }
  this->Image=NULL;
  this->Width = 0;
  this->Height = 0;
  this->SamplesPerPixel = 0;
  this->Compression = 0;
  this->BitsPerSample = 0;
  this->Photometrics = 0;
  this->PlanarConfig = 0;
  this->TileDepth = 0;
}

vtkTIFFReaderXInternal::vtkTIFFReaderXInternal() {
  this->Image           = NULL;
  TIFFSetErrorHandler(&vtkTIFFReaderXInternalErrorHandler);
  TIFFSetWarningHandler(&vtkTIFFReaderXInternalErrorHandler);
  this->Clean();
}

int vtkTIFFReaderXInternal::Initialize() {
  if ( this->Image ) {
    if ( !TIFFGetField(this->Image, TIFFTAG_IMAGEWIDTH, &this->Width) ||
         !TIFFGetField(this->Image, TIFFTAG_IMAGELENGTH, &this->Height) ) {
      return 0;
    }
    TIFFGetField(this->Image, TIFFTAG_SAMPLESPERPIXEL,
                 &this->SamplesPerPixel);
    TIFFGetField(this->Image, TIFFTAG_COMPRESSION, &this->Compression);
    TIFFGetField(this->Image, TIFFTAG_BITSPERSAMPLE,
                 &this->BitsPerSample);
    TIFFGetField(this->Image, TIFFTAG_PHOTOMETRIC, &this->Photometrics);
    TIFFGetField(this->Image, TIFFTAG_PLANARCONFIG, &this->PlanarConfig);
    if ( !TIFFGetField(this->Image, TIFFTAG_TILEDEPTH, &this->TileDepth) ) {
      this->TileDepth = 0;
    }
  }
  return 1;
}

int vtkTIFFReaderXInternal::CanRead() {
  return ( this->Image && ( this->Width > 0 ) && ( this->Height > 0 ) &&
           ( this->SamplesPerPixel > 0 ) &&
           ( this->Compression == COMPRESSION_NONE ) &&
           ( this->Photometrics == PHOTOMETRIC_RGB ||
             this->Photometrics == PHOTOMETRIC_MINISWHITE ||
             this->Photometrics == PHOTOMETRIC_MINISBLACK ||
             this->Photometrics == PHOTOMETRIC_PALETTE ) &&
           this->PlanarConfig == PLANARCONFIG_CONTIG &&
           ( !this->TileDepth ) &&
           ( this->BitsPerSample == 8 )|| this->BitsPerSample == 32 );
}

vtkTIFFReaderX::vtkTIFFReaderX() {
  this->InitializeColors();
  this->InternalImage = new vtkTIFFReaderXInternal;
  this->InternalExtents = 0;
}

vtkTIFFReaderX::~vtkTIFFReaderX() {
  delete this->InternalImage;
}

void vtkTIFFReaderX::ExecuteInformation() {
  this->InitializeColors();
  this->ComputeInternalFileName(this->DataExtent[4]);
  if (this->InternalFileName == NULL) {
    return;
  }

  if ( !this->InternalImage->Open(this->InternalFileName) ) {
    vtkErrorMacro("Unable to open file " <<this->InternalFileName );
    this->DataExtent[0] = 0;
    this->DataExtent[1] = 0;
    this->DataExtent[2] = 0;
    this->DataExtent[3] = 0;
    this->DataExtent[4] = 0;
    this->DataExtent[5] = 0;
    this->SetNumberOfScalarComponents(1);
    this->vtkImageReader2::ExecuteInformation();
    return;
  }

  // pull out the width/height, etc.
  this->DataExtent[0] = 0;
  this->DataExtent[1] = this->GetInternalImage()->Width - 1;
  this->DataExtent[2] = 0;
  this->DataExtent[3] = this->GetInternalImage()->Height - 1;

  switch (this->GetInternalImage()->BitsPerSample) {
  case 32:
    this->SetDataScalarTypeToFloat();
    break;
  default:
    this->SetDataScalarTypeToUnsignedChar();
  }

  switch ( this->GetFormat() ) {
  case vtkTIFFReaderX::GRAYSCALE:
  case vtkTIFFReaderX::PALETTE_GRAYSCALE:
    this->SetNumberOfScalarComponents( 1 );
    break;
  case vtkTIFFReaderX::RGB:
    this->SetNumberOfScalarComponents(
      this->GetInternalImage()->SamplesPerPixel );
    break;
  case vtkTIFFReaderX::PALETTE_RGB:
    this->SetNumberOfScalarComponents( 3 );
    break;
  default:
    this->SetNumberOfScalarComponents( 4 );
  }

  if ( !this->GetInternalImage()->CanRead() ) {
    this->SetNumberOfScalarComponents( 4 );
  }

  this->vtkImageReader2::ExecuteInformation();

  // close the file
  this->GetInternalImage()->Clean();
}


template <class OT>
void vtkTIFFReaderXUpdate2(vtkTIFFReaderX *self, OT *outPtr,
                           int *outExt, int* vtkNotUsed(outInc), long) {
  if ( !self->GetInternalImage()->Open(self->GetInternalFileName()) ) {
    return;
  }
  self->InitializeColors();
  self->ReadImageInternal(self->GetInternalImage()->Image,
                          outPtr, outExt, sizeof(OT) );

  // close the file
  self->GetInternalImage()->Clean();
}

//----------------------------------------------------------------------------
// This function reads in one data of data.
// templated to handle different data types.
template <class OT>
void vtkTIFFReaderXUpdate(vtkTIFFReaderX *self, vtkImageData *data, OT *outPtr) {
  int outIncr[3];
  int outExtent[6];
  OT *outPtr2;

  data->GetExtent(outExtent);
  data->GetIncrements(outIncr);

  long pixSize = data->GetNumberOfScalarComponents()*sizeof(OT);

  outPtr2 = outPtr;
  int idx2;
  for (idx2 = outExtent[4]; idx2 <= outExtent[5]; ++idx2) {
    self->ComputeInternalFileName(idx2);
    // read in a TIFF file
    vtkTIFFReaderXUpdate2(self, outPtr2, outExtent, outIncr, pixSize);
    self->UpdateProgress((idx2 - outExtent[4])/
                         (outExtent[5] - outExtent[4] + 1.0));
    outPtr2 += outIncr[2];
  }
}


//----------------------------------------------------------------------------
// This function reads a data from a file.  The datas extent/axes
// are assumed to be the same as the file extent/order.
void vtkTIFFReaderX::ExecuteData(vtkDataObject *output) {
  vtkImageData *data = this->AllocateOutputData(output);

  if (this->InternalFileName == NULL) {
    vtkErrorMacro("Either a FileName or FilePrefix must be specified.");
    return;
  }

  this->ComputeDataIncrements();

  // Call the correct templated function for the output
  void *outPtr;

  // Call the correct templated function for the input
  outPtr = data->GetScalarPointer();
  switch (data->GetScalarType()) {
    vtkTemplateMacro3(vtkTIFFReaderXUpdate, this, data, (VTK_TT *)(outPtr));
  default:
    vtkErrorMacro("UpdateFromFile: Unknown data type");
  }
}

unsigned int vtkTIFFReaderX::GetFormat( ) {
  unsigned int cc;

  if ( this->ImageFormat != vtkTIFFReaderX::NOFORMAT ) {
    return this->ImageFormat;
  }


  switch ( this->GetInternalImage()->Photometrics ) {
  case PHOTOMETRIC_RGB:
  case PHOTOMETRIC_YCBCR:
    this->ImageFormat = vtkTIFFReaderX::RGB;
    return this->ImageFormat;
  case PHOTOMETRIC_MINISWHITE:
  case PHOTOMETRIC_MINISBLACK:
    this->ImageFormat = vtkTIFFReaderX::GRAYSCALE;
    return this->ImageFormat;
  case PHOTOMETRIC_PALETTE:
    for( cc=0; cc<256; cc++ ) {
      unsigned short red, green, blue;
      this->GetColor( cc, &red, &green, &blue );
      if ( red != green || red != blue ) {
        this->ImageFormat = vtkTIFFReaderX::PALETTE_RGB;
        return this->ImageFormat;
      }
    }
    this->ImageFormat = vtkTIFFReaderX::PALETTE_GRAYSCALE;
    return this->ImageFormat;
  }
  this->ImageFormat = vtkTIFFReaderX::OTHER;
  return this->ImageFormat;
}

void vtkTIFFReaderX::GetColor( int index, unsigned short *red,
                               unsigned short *green, unsigned short *blue ) {
  *red   = 0;
  *green = 0;
  *blue  = 0;
  if ( index < 0 ) {
    vtkErrorMacro("Color index has to be greater than 0");
    return;
  }
  if ( this->TotalColors > 0 &&
       this->ColorRed && this->ColorGreen && this->ColorBlue ) {
    if ( index >= this->TotalColors ) {
      vtkErrorMacro("Color index has to be less than number of colors ("
                    << this->TotalColors << ")");
      return;
    }
    *red   = *(this->ColorRed   + index);
    *green = *(this->ColorGreen + index);
    *blue  = *(this->ColorBlue  + index);
    return;
  }

  unsigned short photometric;

  if (!TIFFGetField(this->GetInternalImage()->Image, TIFFTAG_PHOTOMETRIC, &photometric)) {
    if ( this->GetInternalImage()->Photometrics != PHOTOMETRIC_PALETTE ) {
      vtkErrorMacro("You can only access colors for palette images");
      return;
    }
  }

  unsigned short *red_orig, *green_orig, *blue_orig;

  switch (this->GetInternalImage()->BitsPerSample) {
  case 1:
  case 2:
  case 4:
  case 8:
  case 16:
    break;
  default:
    vtkErrorMacro( "Sorry, can not image with "
                   << this->GetInternalImage()->BitsPerSample
                   << "-bit samples" );
    return;
  }
  if (!TIFFGetField(this->GetInternalImage()->Image, TIFFTAG_COLORMAP,
                    &red_orig, &green_orig, &blue_orig)) {
    vtkErrorMacro("Missing required \"Colormap\" tag");
    return;
  }
  this->TotalColors = (1L << this->GetInternalImage()->BitsPerSample);

  if ( index >= this->TotalColors ) {
    vtkErrorMacro("Color index has to be less than number of colors ("
                  << this->TotalColors << ")");
    return;
  }
  this->ColorRed   =   red_orig;
  this->ColorGreen = green_orig;
  this->ColorBlue  =  blue_orig;

  *red   = *(red_orig   + index);
  *green = *(green_orig + index);
  *blue  = *(blue_orig  + index);
}

void vtkTIFFReaderX::InitializeColors() {
  this->ColorRed    = 0;
  this->ColorGreen  = 0;
  this->ColorBlue   = 0;
  this->TotalColors = -1;
  this->ImageFormat = vtkTIFFReaderX::NOFORMAT;
}

template <typename T>
void ReadTiledImage(vtkTIFFReaderX *self, void *out,unsigned int width,unsigned int height,unsigned int size, int *InternalExtents) {
  TIFF *tiff;
  uint32 tileWidth, tileLength, x, y, yi, rows, cols, tileSize;
  unsigned int xx,yy;
  double oneRow;
  int pixelDepth = self->GetInternalImage()->SamplesPerPixel;
  T *buffer, *image;
  uint32 imagepos;

  image = (T*) out;
  tiff = self->GetInternalImage()->Image;
  TIFFGetField(tiff, TIFFTAG_TILEWIDTH, &tileWidth);
  TIFFGetField(tiff, TIFFTAG_TILELENGTH, &tileLength);
  oneRow = (double) tileLength / (double) height;
  tileSize = TIFFTileSize(tiff);
  buffer = new T[tileSize];

  for(yi=0;yi<height;yi+=tileLength) {
    for(x=0;x<width;x+=tileWidth) {
      y = yi;
      TIFFReadTile(tiff, buffer, x,y,0,0);
      if (tileWidth > width - x) {
        cols = width-x;
      } else {
        cols = tileWidth;
      }
      if(tileLength > height - y) {
        rows = height - y;
      } else {
        rows = tileLength;
      }
      for(uint32 j = 0;j< rows;j++) {
        for(uint32 i=0;i<cols;i++) {
          uint32 tilepos = (i+j*cols)*pixelDepth;
          imagepos  = (((height -1) - y)*width+(x) + i - (j)*width)*pixelDepth;
          xx = x + i;
          yy = (height-1-y-j);
          if ( xx >= InternalExtents[0] &&
               xx <= InternalExtents[1] &&
               yy >= InternalExtents[2] &&
               yy <= InternalExtents[3] ) {
            imagepos = (xx + width*yy)*pixelDepth;
            self->EvaluateImageAt(image+imagepos, buffer+tilepos);
          }
        }
      }
    }
  }
  delete [] buffer;
}

template<typename T>
void ReadScanlineImage(vtkTIFFReaderX *self, void *out, unsigned int width, unsigned height, unsigned int vtkNotUsed(size), int *InternalExtents) {
	unsigned int isize = TIFFScanlineSize(self->GetInternalImage()->Image);
  unsigned int cc;
  int row, inc;
  int xx=0, yy=0;
  /*tdata_t*/ T* buf =  new T[isize];//_TIFFmalloc(isize);
  T *image = (T *)out;
	unsigned int c_inc = self->GetInternalImage()->SamplesPerPixel * self->GetInternalImage()->BitsPerSample;
	if ( self->GetInternalImage()->PlanarConfig == PLANARCONFIG_CONTIG ) {
    for ( row = height-1; row >= 0; row -- ) {
      if (TIFFReadScanline(self->GetInternalImage()->Image, buf, row, 0) <= 0) {
        cout << "Problem reading the row: " << row << endl;
				
        break;
      }

      for (cc = 0; cc < isize;
           cc ++/*= c_inc*/ ) {
        if ( xx >= InternalExtents[0] &&
             xx <= InternalExtents[1] &&
             yy >= InternalExtents[2] &&
             yy <= InternalExtents[3] ) {
          //unsigned char *c = static_cast<unsigned char *>(buf)+cc;
          inc = self->EvaluateImageAt( image,
                                       buf + cc
                                       );
					//cout << *image << " " << endl;
          //image += inc;
					image++;
        }
        xx++;
      }
      xx=0;
      yy++;
    }
  } else {
    cout << "This reader can only do PLANARCONFIG_CONTIG" << endl;
  }

	delete [] buf;
  //_TIFFfree(buf);
}

void vtkTIFFReaderX::ReadImageInternal( void* vtkNotUsed(in), void* outPtr,
                                        int* outExt,
                                        unsigned int size ) {
  if ( this->GetInternalImage()->Compression == COMPRESSION_OJPEG ) {
    vtkErrorMacro("This reader cannot read old JPEG compression");
    return;
  }

  int width  = this->GetInternalImage()->Width;
  int height = this->GetInternalImage()->Height;
  this->InternalExtents = outExt;

  if ( !this->GetInternalImage()->CanRead() ) {
    uint32 *tempImage
    = static_cast<uint32*>( outPtr );

    if ( this->InternalExtents[0] != 0 ||
         this->InternalExtents[1] != width -1 ||
         this->InternalExtents[2] != 0 ||
         this->InternalExtents[3] != height-1 ) {
      tempImage = new uint32[ width * height ];
    }
    if ( !TIFFReadRGBAImage(this->GetInternalImage()->Image,
                            width, height,
                            tempImage, 0 ) ) {
      vtkErrorMacro("Problem reading RGB image");
      if ( tempImage != outPtr ) {
        delete [] tempImage;
      }

      return;
    }
    int xx, yy;
    unsigned char *simage = (unsigned char *)tempImage;
    uint32* ssimage = tempImage;
    unsigned char *fimage = (unsigned char *)outPtr;
    for ( yy = 0; yy < height; yy ++ ) {
      for ( xx = 0; xx < width; xx++ ) {
        if ( xx >= this->InternalExtents[0] &&
             xx <= this->InternalExtents[1] &&
             yy >= this->InternalExtents[2] &&
             yy <= this->InternalExtents[3] ) {
          /*
          unsigned char red   = *(simage);
          unsigned char green = *(simage+1);
          unsigned char blue  = *(simage+2);
          unsigned char alpha = *(simage+3);
          */
          unsigned char red   = static_cast<unsigned char>(TIFFGetR(*ssimage));
          unsigned char green = static_cast<unsigned char>(TIFFGetG(*ssimage));
          unsigned char blue  = static_cast<unsigned char>(TIFFGetB(*ssimage));
          unsigned char alpha = static_cast<unsigned char>(TIFFGetA(*ssimage));

          *(fimage  ) = red;//red;
          *(fimage+1) = green;//green;
          *(fimage+2) = blue;//blue;
          *(fimage+3) = alpha;//alpha;
          fimage += 4;
        }
        simage += 4;
        ssimage ++;
      }
    }

    if ( tempImage != 0 && tempImage != outPtr ) {
      delete [] tempImage;
    }
    return;
  }

  unsigned int format = this->GetFormat();


  if ( this->GetInternalImage()->Compression == COMPRESSION_PACKBITS ) {
    height /= this->GetInternalImage()->BitsPerSample;
  }

  switch ( format ) {
  case vtkTIFFReaderX::GRAYSCALE:
  case vtkTIFFReaderX::RGB:
  case vtkTIFFReaderX::PALETTE_RGB:
  case vtkTIFFReaderX::PALETTE_GRAYSCALE:
    if (TIFFIsTiled(this->GetInternalImage()->Image)) {
      switch(this->GetInternalImage()->BitsPerSample) {
      case 32:
        ReadTiledImage<float>(this, outPtr, width, height, size, this->InternalExtents);
        break;
      default:
        ReadTiledImage<unsigned char>(this, outPtr, width, height, size, this->InternalExtents);

      }
    } else {
			switch(this->GetInternalImage()->BitsPerSample) {
				case 32:
					ReadScanlineImage<float>(this, outPtr, width, height, size, this->InternalExtents);
					break;
				default:
					this->ReadGenericImage( outPtr, width, height, size );
			}
    }
    break;
  default:
    return;
  }
}



void vtkTIFFReaderX::ReadGenericImage( void *out,
                                       unsigned int vtkNotUsed(width),
                                       unsigned int height,
                                       unsigned int vtkNotUsed(size) ) {
  unsigned int isize = TIFFScanlineSize(this->GetInternalImage()->Image);
  unsigned int cc;
  int row, inc;
  int xx=0, yy=0;
  tdata_t buf = _TIFFmalloc(isize);
  unsigned char *image = (unsigned char *)out;

  if ( this->GetInternalImage()->PlanarConfig == PLANARCONFIG_CONTIG ) {
    for ( row = height-1; row >= 0; row -- ) {
      if (TIFFReadScanline(this->GetInternalImage()->Image, buf, row, 0) <= 0) {
        vtkErrorMacro("Problem reading the row: " << row);
        break;
      }
      for (cc = 0; cc < isize;
           cc += this->GetInternalImage()->SamplesPerPixel ) {
        if ( xx >= this->InternalExtents[0] &&
             xx <= this->InternalExtents[1] &&
             yy >= this->InternalExtents[2] &&
             yy <= this->InternalExtents[3] ) {
          //unsigned char *c = static_cast<unsigned char *>(buf)+cc;
          inc = this->EvaluateImageAt( image,
                                       static_cast<unsigned char *>(buf) +
                                       cc );
          image += inc;
        }
        xx++;
      }
      xx=0;
      yy++;
    }
  } else {
    vtkErrorMacro("This reader can only do PLANARCONFIG_CONTIG");
  }

  _TIFFfree(buf);
}

int vtkTIFFReaderX::EvaluateImageAt( void* out, void* in ) {
  unsigned char *image = (unsigned char *)out;
  unsigned char *source = (unsigned char *)in;
  int increment = 0;
  unsigned short red, green, blue, alpha;
  switch ( this->GetFormat() ) {
  case vtkTIFFReaderX::GRAYSCALE:
    if ( this->GetInternalImage()->Photometrics ==
         PHOTOMETRIC_MINISBLACK ) {
      *image = *source;
    } else {
      *image = ~( *source );
    }
    increment = 1;
    break;
  case vtkTIFFReaderX::PALETTE_GRAYSCALE:
    this->GetColor(*source, &red, &green, &blue);
    *image = red;
    increment = 1;
    break;
  case vtkTIFFReaderX::RGB:
    red   = *(source);
    green = *(source+1);
    blue  = *(source+2);
    *(image)   = red;
    *(image+1) = green;
    *(image+2) = blue;
    if ( this->GetInternalImage()->SamplesPerPixel == 4 ) {
      alpha = *(source+3);
      *(image+3) = 255-alpha;
    }
    increment = this->GetInternalImage()->SamplesPerPixel;
    break;
  case vtkTIFFReaderX::PALETTE_RGB:
    this->GetColor(*source, &red, &green, &blue);
    *(image)   = static_cast<unsigned char>(red >> 8);
    *(image+1) = static_cast<unsigned char>(green >> 8);
    *(image+2) = static_cast<unsigned char>(blue >> 8);
    increment = 3;
    break;
  default:
    return 0;
  }

  return increment;
}

int vtkTIFFReaderX::EvaluateImageAt( float* image, float* source ) {
  int increment = 0;
  switch ( this->GetFormat() ) {
  case vtkTIFFReaderX::GRAYSCALE:
    *image = *source;
    increment = 4;
		break;
  default:
    increment = 0;
  }
  return increment;
}


int vtkTIFFReaderX::CanReadFile(const char* fname) {
  vtkTIFFReaderXInternal tf;
  int res = tf.Open(fname);
  tf.Clean();
  if (res) {
    return 3;
  }
  return 0;
}

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