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/*
* $Id: common.h,v 1.30 2010/02/05 23:50:22 simakov Exp $
*
* EPSILON - wavelet image compression library.
* Copyright (C) 2006,2007,2010 Alexander Simakov, <xander@entropyware.info>
*
* This file is part of EPSILON
*
* EPSILON is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* EPSILON 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with EPSILON. If not, see <http://www.gnu.org/licenses/>.
*
* http://epsilon-project.sourceforge.net
*/
/** \file
*
* \brief Useful macro and defines
*
* This file contains useful macro and defines which are
* common to all library parts. */
#ifndef __COMMON_H__
#define __COMMON_H__
#ifdef __cplusplus
extern "C" {
#endif
/** \addtogroup misc Miscellanea */
/*@{*/
/* Use _snprintf instead of snprintf under MSVC compiler */
#if defined(_WIN32) && !defined(__MINGW32__)
#define snprintf _snprintf
#endif
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <sys/types.h>
/** Maximum value */
#define MAX(_x, _y) ((_x) > (_y) ? (_x) : (_y))
/** Minimum value */
#define MIN(_x, _y) ((_x) < (_y) ? (_x) : (_y))
/** Absolute value */
#define ABS(_x) ((_x) >= 0 ? (_x) : -(_x))
/** Square root */
#define SQRT2 1.414213562373095
/** Very helpful definition */
#define local static
/** Table to speed-up number_of_bits() calculation */
local int number_of_bits_table[256] = {
0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
};
/** Number of bits in a byte value */
#define NUMBER_OF_BITS(_x) (number_of_bits_table[(_x)])
/** Extract one byte from integer */
#define GET_BYTE(_x, _i) (((unsigned char *) &(_x))[(_i)])
/** Type definition for filter coefficients */
typedef double coeff_t;
/** Number of bits in the value
*
* This function computes the number of bits in the \a value
* (e.g. number_of_bits(13) = 4).
*
* \param value Target value
*
* \return Number of bits */
int number_of_bits(int value);
/** Check whether the \a value is a power of two or not
*
* This function checks whether the \a value is a
* power of two or not.
*
* \param value Target value
*
* \return \c 1 if \a value is a power of two and \c 0 otherwise */
int is_power_of_two(int value);
/*@}*/
#ifdef __cplusplus
}
#endif
#endif /* __COMMON_H__ */
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