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__
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 * Copyright (c) 2001-2006 Michael David Adams
 * Copyright (c) 1999-2000 Image Power, Inc.
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/*
 * 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.
\******************************************************************************/
 
/*
jpc_fix_t.
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).
 
jpc_fix_big_t.
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).
 
JPC_FIX_FRACBITS.
The number of bits used for the fractional part of a fixed-point number.
*/
 
typedef jas_fix_t jpc_fix_t;
typedef jas_fix_big_t jpc_fix_big_t;
 
#if defined(JAS_ENABLE_32BIT)
#define JPC_FIX_FRACBITS        13
#else
#define JPC_FIX_FRACBITS        18
#endif
 
/******************************************************************************\
* 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)
 
#if 0
#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
#endif
#define jpc_fix_asl jas_fix_asl
#define jpc_fix_asr jas_fix_asr
 
#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