/*
 * filter.c
 *
 *
 *
 * Copyright (C) 2002 - 2002 Benninghaus, Rottweil
 * EMail: el@eb-themen.de
 *
 * 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.
 */

#ifndef _filter_c
#define _filter_c

#ifdef __cplusplus
extern "C" {
#endif



filtervalues fv;


int filterfirst( unsigned char *buf ) {


	int x        = 0;
	int y        = 0;
	unsigned char *p;

	fv.mincol  = 255;
	fv.maxcol  = 0;
	fv.nr_dark = 0;
	fv.nr_bright = 0;
		
	p    = buf;
	while( y < HEIGHT ) {
		x = 0;
		while( x < WIDTH ) {
/*
			p[0] = ( 255 - p[0] );
*/

			if(p[0] < fv.mincol){
				fv.mincol = p[0];
				fv.min.x = x;
				fv.min.y = y;
			}
			if(p[0] > fv.maxcol){
				fv.maxcol = p[0];
				fv.max.x = x;
				fv.max.y = y;
			}
			
			p++;
			x++;
		}
		
		y++;
	}


	x 	= 0;
	y 	= 0;
	p   = buf;
	while( y < HEIGHT ) {
		x = 0;
		while( x < WIDTH ) {
			if(p[0] <= ( fv.maxcol - cfg.coltolerance ) ){
				p[0] = 0;
				fv.nr_dark++;
			}
			else {
				p[0] = 255;
				fv.nr_bright++;
			}	
			p++;					
			x++;
		}
		
		y++;
	}
	

	return( 1 );

}				




int filter( unsigned char *buf ) {

	int x      = 0;
	int y      = 0;
	unsigned char *p;

	p    = buf;
	while( y < HEIGHT ) {
		x = 0;
		while( x < WIDTH ) {

/*
			p[0] = ( 255 - p[0] );
*/
			if(p[0] <= ( fv.maxcol - cfg.coltolerance ) ){
				p[0] = 0;
			}
			else {
				p[0] = 255;
			}
			
			p++;					
			x++;
		}
		
		y++;
	}

	return( 1 );
}				





#ifdef __cplusplus
}
#endif


#endif /*_filter_c*/