/* 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"

Color::Color() : _r(0), _g(0), _b(0) {
}

Color::Color(value_type r, value_type g, value_type b) : _r(r), _g(g), _b(b) {
}

Color::Color(const Color & c) : _r(c._r), _g(c._g), _b(c._b) {
}

Color & Color::operator=(const Color & c) {
	_r = c._r;
	_g = c._g;
	_b = c._b;
	return *this;
}

Color::~Color() {
}

Color::value_type Color::red() const { 
	return _r; 
}

Color::value_type Color::green() const { 
	return _g; 
}

Color::value_type Color::blue() const { 
	return _b;
}

void Color::delta(short * ptr) {
	// This is a very specific method for XPALs.
	int t;
#define UPDATE_COLOR(c, inc) (((int)((c)) << 7) + (c) + (inc)) >> 7
#define CHECK_BOUNDS(c) (((c) > 255) ? 255 : (((c) < 0) ? 0 : (c)))
	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);
#undef UPDATE_COLOR
#undef CHECK_BOUNDS
}