1 /*
2 * steghide 0.5.1 - a steganography program
3 * Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 *
19 */
20
21 #include "BmpSampleValue.h"
22 #include "common.h"
23
calcDistance(const SampleValue * s) const24 UWORD32 BmpSampleValue::calcDistance (const SampleValue *s) const
25 {
26 const BmpSampleValue *sample = (const BmpSampleValue*) s ;
27 /* If s is not a BmpSampleValue then we get into real trouble here.
28 But calcDistance is called very often, a dynamic_cast costs a lot of time and
29 it does not make sense to pass anything but a BmpSampleValue as s anyway. */
30
31 int dr = (int) getRed() - (int) sample->getRed() ;
32 int dg = (int) getGreen() - (int) sample->getGreen() ;
33 int db = (int) getBlue() - (int) sample->getBlue() ;
34 return (UWORD32) (dr*dr + dg*dg + db*db) ;
35 }
36