mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-23 02:11:38 +00:00
38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
/* 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);
|
|
}
|