ref: 7cdf839293bf3c0b5c3f52d368635156530ddf85
dir: /jpc_fix.h/
/*
* Copyright (c) 1999-2000 Image Power, Inc. and the University of
* British Columbia.
* Copyright (c) 2001-2002 Michael David Adams.
* All rights reserved.
*/
/* __START_OF_JASPER_LICENSE__
*
* JasPer License Version 2.0
*
* Copyright (c) 2001-2006 Michael David Adams
* Copyright (c) 1999-2000 Image Power, Inc.
* Copyright (c) 1999-2000 The University of British Columbia
*
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person (the
* "User") obtaining a copy of this software and associated documentation
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*
* 1. The above copyright notices and this permission notice (which
* includes the disclaimer below) shall be included in all copies or
* substantial portions of the Software.
*
* 2. The name of a copyright holder shall not be used to endorse or
* promote products derived from the Software without specific prior
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*
* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
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* __END_OF_JASPER_LICENSE__
*/
/*
* Fixed-Point Number Class
*
* $Id$
*/
#ifndef JPC_FIX_H
#define JPC_FIX_H
/******************************************************************************\
* Includes.
\******************************************************************************/
#include "jasper/jas_config.h"
#include "jasper/jas_types.h"
#include "jasper/jas_fix.h"
#include "jasper/jas_math.h"
/******************************************************************************\
* Basic parameters of the fixed-point type.
\******************************************************************************/
/* The integral type used to represent a fixed-point number. This
type must be capable of representing values from -(2^31) to 2^31-1
(inclusive). */
#ifdef JAS_ENABLE_32BIT
typedef int_least32_t jpc_fix_t;
#else
typedef int_fast32_t jpc_fix_t;
#endif
/* The integral type used to respresent higher-precision intermediate results.
This type should be capable of representing values from -(2^63) to 2^63-1
(inclusive). */
typedef int_fast64_t jpc_fix_big_t;
/* The number of bits used for the fractional part of a fixed-point number. */
#define JPC_FIX_FRACBITS 13
/******************************************************************************\
* Instantiations of the generic fixed-point number macros for the
* parameters given above. (Too bad C does not support templates, eh?)
* The purpose of these macros is self-evident if one examines the
* corresponding macros in the jasper/jas_fix.h header file.
\******************************************************************************/
#define JPC_FIX_ZERO JAS_FIX_ZERO(jpc_fix_t, JPC_FIX_FRACBITS)
#define JPC_FIX_ONE JAS_FIX_ONE(jpc_fix_t, JPC_FIX_FRACBITS)
#define JPC_FIX_HALF JAS_FIX_HALF(jpc_fix_t, JPC_FIX_FRACBITS)
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_inttofix(int x)
{
return JAS_INTTOFIX(jpc_fix_t, JPC_FIX_FRACBITS, x);
}
JAS_ATTRIBUTE_CONST
static inline int jpc_fixtoint(jpc_fix_t x)
{
return JAS_FIXTOINT(jpc_fix_t, JPC_FIX_FRACBITS, x);
}
JAS_ATTRIBUTE_CONST
static inline double jpc_fixtodbl(jpc_fix_t x)
{
return JAS_FIXTODBL(jpc_fix_t, JPC_FIX_FRACBITS, x);
}
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_dbltofix(double x)
{
return JAS_DBLTOFIX(jpc_fix_t, JPC_FIX_FRACBITS, x);
}
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_fix_add(jpc_fix_t x, jpc_fix_t y)
{
return JAS_FIX_ADD(jpc_fix_t, JPC_FIX_FRACBITS, x, y);
}
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_fix_sub(jpc_fix_t x, jpc_fix_t y)
{
return JAS_FIX_SUB(jpc_fix_t, JPC_FIX_FRACBITS, x, y);
}
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_fix_mul(jpc_fix_big_t x, jpc_fix_big_t y)
{
return JAS_FIX_MUL(jpc_fix_t, JPC_FIX_FRACBITS, jpc_fix_big_t, x, y);
}
JAS_ATTRIBUTE_CONST
static inline jpc_fix_big_t jpc_fix_mulbyint(jpc_fix_big_t x, int y)
{
return JAS_FIX_MUL(jpc_fix_t, JPC_FIX_FRACBITS, jpc_fix_big_t, x, y);
}
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_fix_div(jpc_fix_big_t x, jpc_fix_t y)
{
return JAS_FIX_DIV(jpc_fix_t, JPC_FIX_FRACBITS, jpc_fix_big_t, x, y);
}
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_fix_neg(jpc_fix_t x)
{
return JAS_FIX_NEG(jpc_fix_t, JPC_FIX_FRACBITS, x);
}
//#define jpc_fix_asl(x, n) JAS_FIX_ASL(jpc_fix_t, JPC_FIX_FRACBITS, x, n)
//#define jpc_fix_asr(x, n) JAS_FIX_ASR(jpc_fix_t, JPC_FIX_FRACBITS, x, n)
#ifdef JAS_ENABLE_32BIT
#define jpc_fix_asl jas_least32_asl
#define jpc_fix_asr jas_least32_asr
#else
#define jpc_fix_asl jas_fast32_asl
#define jpc_fix_asr jas_fast32_asr
#endif
#define jpc_fix_pluseq(x, y) JAS_FIX_PLUSEQ(jpc_fix_t, JPC_FIX_FRACBITS, x, y)
#define jpc_fix_minuseq(x, y) JAS_FIX_MINUSEQ(jpc_fix_t, JPC_FIX_FRACBITS, x, y)
#define jpc_fix_muleq(x, y) \
JAS_FIX_MULEQ(jpc_fix_t, JPC_FIX_FRACBITS, jpc_fix_big_t, x, y)
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_fix_abs(jpc_fix_t x)
{
return JAS_FIX_ABS(jpc_fix_t, JPC_FIX_FRACBITS, x);
}
JAS_ATTRIBUTE_CONST
static inline bool jpc_fix_isint(jpc_fix_t x)
{
return JAS_FIX_ISINT(jpc_fix_t, JPC_FIX_FRACBITS, x);
}
JAS_ATTRIBUTE_CONST
static inline int jpc_fix_sgn(jpc_fix_t x)
{
return JAS_FIX_SGN(jpc_fix_t, JPC_FIX_FRACBITS, x);
}
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_fix_round(jpc_fix_t x)
{
return JAS_FIX_ROUND(jpc_fix_t, JPC_FIX_FRACBITS, x);
}
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_fix_floor(jpc_fix_t x)
{
return JAS_FIX_FLOOR(jpc_fix_t, JPC_FIX_FRACBITS, x);
}
/******************************************************************************\
* Extra macros for convenience.
\******************************************************************************/
/* Compute the sum of three fixed-point numbers. */
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t jpc_fix_add3(jpc_fix_t x, jpc_fix_t y, jpc_fix_t z)
{
return jpc_fix_add(jpc_fix_add(x, y), z);
}
#endif