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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001/2002 The ScummVM project
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include <stdafx.h>
#include "color.h"
#define UPDATE_COLOR(c, inc) (((int32)((c)) << 7) + (c) + (inc)) >> 7
#define CHECK_BOUNDS(c) (((c) > 255) ? 255 : (((c) < 0) ? 0 : (c)))
void Color::delta(int16 * ptr) {
// This is a very specific method for XPALs.
int16 t;
t = UPDATE_COLOR(_r, ptr[0]);
_r = CHECK_BOUNDS(t);
t = UPDATE_COLOR(_g, ptr[1]);
_g = CHECK_BOUNDS(t);
t = UPDATE_COLOR(_b, ptr[2]);
_b = CHECK_BOUNDS(t);
}
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