ref: 0d62e74e14ccf4e123d5c2d7af76cb02e695c0ee
dir: /jpc_math.h/
/*
* Copyright (c) 2001-2002 Michael David Adams.
* All rights reserved.
*/
/* __START_OF_JASPER_LICENSE__
*
* JasPer License Version 2.0
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* Copyright (c) 2001-2006 Michael David Adams
* Copyright (c) 1999-2000 Image Power, Inc.
* Copyright (c) 1999-2000 The University of British Columbia
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*/
#ifndef JPC_MATH_H
#define JPC_MATH_H
/******************************************************************************\
* Includes
\******************************************************************************/
#include "jasper/jas_config.h"
#include "jpc_fix.h"
/******************************************************************************\
* Macros
\******************************************************************************/
/* Compute the floor of the quotient of two integers. */
#define JPC_FLOORDIV(x, y) ((x) / (y))
/* Compute the ceiling of the quotient of two integers. */
#define JPC_CEILDIV(x, y) (((x) + (y) - 1) / (y))
/* Compute the floor of (x / 2^y). */
#define JPC_FLOORDIVPOW2(x, y) ((x) >> (y))
/* Compute the ceiling of (x / 2^y). */
#define JPC_CEILDIVPOW2(x, y) (((x) + (1 << (y)) - 1) >> (y))
/******************************************************************************\
* Functions.
\******************************************************************************/
/* Calculate the bit position of the first leading one in a nonnegative
integer. */
JAS_ATTRIBUTE_CONST
int jpc_int_firstone(int x);
JAS_ATTRIBUTE_CONST
int jpc_fix_firstone(jpc_fix_t x);
/* Calculate the integer quantity floor(log2(x)), where x is a positive
integer. */
JAS_ATTRIBUTE_CONST
unsigned jpc_floorlog2(uint_fast32_t x);
#endif