#ifndef _thumbnail_h_
#define _thumbnail_h_

//  thumbnail.h
//
// Copyright (c) 2003 Philip Romanik, Amy Muntz
//
// Permission to use, copy, modify, distribute, and sell this software and
// its documentation for any purpose is hereby granted without fee, provided
// that (i) the above copyright notices and this permission notice appear in
// all copies of the software and related documentation, and (ii) the names
// of Philip Romanik and Amy Muntz may not be used in any advertising or
// publicity relating to the software without the specific, prior written
// permission of Philip Romanik and Amy Muntz.
//
// Use of this software and/or its documentation will be deemed to be
// acceptance of these terms.
//
// THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
// EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
// WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
//
// IN NO EVENT SHALL PHILIP ROMANIK OR AMY MUNTZ BE LIABLE FOR
// ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
// OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
// WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
// LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
// OF THIS SOFTWARE.
//
//
//  Simple stand-alone thumbnail generator program


#include "image.h"


// Ruler
//       1         2         3         4         5         6    6
//345678901234567890123456789012345678901234567890123456789012345


// *****************
// *               *
// *  apThumbNail  *
// *               *
// *****************
//
//  apThumbNail reads an input file and produces an output file
//  which is a specified reduction of the original.


class apThumbNail
{
public:
  apThumbNail ();
  ~apThumbNail ();

  // The default copy constructor and assignment operator is ok

  void createThumbNail (const char* inputFile,
                        const char* outputFile, int factor);  
  // Create thumbnail with specified reduction factor (2,3,..)

  class invalid {};
  // Exception we'll throw when an error is detected

private:
  void readImage  (const char* inputFile);
  void writeImage (const char* outputFile) const;
  // Read original image and write thumbnail image.

  unsigned char averagePixels (int x0, int y0, int factor);
  // Produces a single output pixel in the thumbnail image

  apImage image_;         // input image
  apImage thumbnail_;     // thumbnail image
};


#endif // _thumbnail_h_