/* ScummVM - Scumm Interpreter
 * Copyright (C) 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.
 *
 * $Header$
 */

#ifndef COMMON_UTIL_H
#define COMMON_UTIL_H

#include "scummsys.h"

#ifndef ABS
#define ABS(x) ((x)>=0?(x):-(x))
#endif

#ifndef MIN
#define	MIN(a,b) (((a)<(b))?(a):(b))
#endif

#ifndef MAX
#define	MAX(a,b) (((a)>(b))?(a):(b))
#endif

static inline void SWAP(int &a, int &b) { int tmp=a; a=b; b=tmp; }
#define ARRAYSIZE(x) (sizeof(x)/sizeof(x[0]))

#if USE_555_FORMAT
// Assume the 16 bit graphics data is in 5-5-5 format
#define RGB_TO_16(r,g,b)	(((((r)>>3)&0x1F) << 10) | ((((g)>>3)&0x1F) << 5) | (((b)>>3)&0x1F))
#define RED_FROM_16(x)		((((x)>>10)&0x1F) << 3)
#define GREEN_FROM_16(x)	((((x)>>5)&0x1F) << 3)
#define BLUE_FROM_16(x)		(((x)&0x1F) << 3)

#elif defined(__GP32__) //ph0x
// GP32 format 5-5-5-1 (first bit means intensity)
#define RGB_TO_16(r,g,b)	(((((r)>>3)&0x1F) << 11) | ((((g)>>3)&0x1F) << 6) | (((b)>>3)&0x1F)<<1)
#define RED_FROM_16(x)		((((x)>>11)&0x1F) << 3)
#define GREEN_FROM_16(x)	((((x)>>6) &0x1F) << 3)
#define BLUE_FROM_16(x)		((((x)>>1) &0x1F) << 3)

#else
// Assume the 16 bit graphics data is in 5-6-5 format
#define RGB_TO_16(r,g,b)	(((((r)>>3)&0x1F) << 11) | ((((g)>>2)&0x3F) << 5) | (((b)>>3)&0x1F))
#define RED_FROM_16(x)		((((x)>>11)&0x1F) << 3)
#define GREEN_FROM_16(x)	((((x)>>5)&0x3F) << 2)
#define BLUE_FROM_16(x)		(((x)&0x1F) << 3)
#endif

int RGBMatch(byte *palette, int r, int g, int b);
int Blend(int src, int dst, byte *palette);
void ClearBlendCache(byte *palette, int weight);

/*
 * Print hexdump of the data passed in, 8 bytes a row
 */
void hexdump(const byte * data, int len);

// Resource string length
int resStrLen(const char *src);


class RandomSource {
private:
	uint32 _randSeed;

public:
	RandomSource(uint32 seed = 0xA943DE33);
	void setSeed(uint32 seed);
	uint getRandomNumber(uint max);
	uint getRandomNumberRng(uint min, uint max);
};

#endif