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/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2003 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.
*
* $Header$
*/
#ifndef COMMON_UTIL_H
#define COMMON_UTIL_H
#include "common/scummsys.h"
#include "common/system.h"
template<typename T> inline T ABS (T x) { return (x>=0) ? x : -x; }
template<typename T> inline T MIN (T a, T b) { return (a<b) ? a : b; }
template<typename T> inline T MAX (T a, T b) { return (a>b) ? a : b; }
/**
* Template method which swaps the vaulues of its two parameters.
*/
template<typename T> inline void SWAP(T &a, T &b) { T tmp = a; a = b; b = tmp; }
#define ARRAYSIZE(x) ((int)(sizeof(x) / sizeof(x[0])))
int RGBMatch(byte *palette, int r, int g, int b);
int Blend(int src, int dst, byte *palette);
void ClearBlendCache();
/**
* Print a hexdump of the data passed in. The number of bytes per line
* is customizable.
* @param data the data to be dumped
* @param len the lenght of that data
* @param bytes_per_line number of bytes to print per line (default: 16)
*/
void hexdump(const byte * data, int len, int bytes_per_line = 16);
/**
* A simple random number generator. Although it is definitely not suitable
* for cryptographic purposes, it serves our purposes just fine.
*/
class RandomSource {
private:
uint32 _randSeed;
public:
RandomSource(uint32 seed = 0xA943DE33);
void setSeed(uint32 seed);
/**
* Generates a random unsigned integer in the interval [0, max].
* @param max the upper bound
* @return a random number in the interval [0, max].
*/
uint getRandomNumber(uint max);
/**
* Generates a random unsigned integer in the interval [min, max].
* @param min the lower bound
* @param max the upper bound
* @return a random number in the interval [min, max].
*/
uint getRandomNumberRng(uint min, uint max);
};
/**
* Auxillary class to (un)lock a mutex on the stack.
*/
class StackLock {
OSystem::MutexRef _mutex;
OSystem *_syst;
void lock();
void unlock();
public:
StackLock(OSystem::MutexRef mutex, OSystem *syst = 0);
~StackLock();
};
#endif
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