// image.cpp -- base class for image data
//
// Written by Frederic Bouvier, started October 2001.
//
// Copyright (C) 2001  Frederic Bouvier - fredb@users.sourceforge.net
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id: image.cpp,v 1.6 2005/05/09 07:01:52 fredb Exp $

#include "image.hpp"

FGSD_Image::FGSD_Image()
   :  _buffer( 0 )
   ,  _width( 0 )
   ,  _height( 0 )
   ,  _rowStride( 0 )
   ,  _depth( 0 )
{
}

FGSD_Image::~FGSD_Image()
{
   if ( _buffer != 0 )
      delete[] _buffer;
}

void FGSD_Image::allocImage( unsigned int __width, unsigned int __height, unsigned int __depth )
{
   if ( _buffer )
      delete _buffer;

   _buffer = new unsigned char[ __width * __height * __depth ];
   _width = __width;
   _height = __height;
   _rowStride = __depth * _width;
   _depth = __depth;
}

unsigned char * FGSD_Image::buffer( unsigned int __row )
{
   return &_buffer[ __row * _rowStride ];
}

bool FGSD_Image::load( const char *__fileName )
{
   return false;
}

bool FGSD_Image::save( const char *__fileName )
{
   return false;
}

void FGSD_Image::getAverageColor( float &red, float &green, float &blue )
{
   red = green = blue = 0.0;
   float total = 0.0;
   for ( unsigned int r = 0; r < _height; ++r )
      {
      unsigned char *b = buffer( r );
      for ( unsigned int c = 0; c < _width; c += _depth )
         {
         red += (float)b[ c * _depth ];
         green += (float)b[ c * _depth + 1 ];
         blue += (float)b[ c * _depth + 2 ];
         total += 255.0;
         }
      }
   if ( total == 0.0 )
      return;
   red /= total;
   green /= total;
   blue /= total;
}