359 lines
13 KiB
C
359 lines
13 KiB
C
/*
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* Copyright (c) 1999-2000 Image Power, Inc. and the University of
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* British Columbia.
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* Copyright (c) 2001-2002 Michael David Adams.
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* All rights reserved.
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*/
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/* __START_OF_JASPER_LICENSE__
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*
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* JasPer License Version 2.0
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*
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* Copyright (c) 2001-2006 Michael David Adams
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* Copyright (c) 1999-2000 Image Power, Inc.
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* Copyright (c) 1999-2000 The University of British Columbia
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*
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person (the
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* "User") obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, and/or sell copies of the Software, and to permit
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* persons to whom the Software is furnished to do so, subject to the
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* following conditions:
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*
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* 1. The above copyright notices and this permission notice (which
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* includes the disclaimer below) shall be included in all copies or
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* substantial portions of the Software.
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*
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* 2. The name of a copyright holder shall not be used to endorse or
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* promote products derived from the Software without specific prior
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* written permission.
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*
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* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
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* LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
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* THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
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* "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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* PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
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* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
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* PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
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* THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
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* EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
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* BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
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* PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
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* GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
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* ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
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* IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
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* SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
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* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
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* SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
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* THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
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* PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
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* RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
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* EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
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*
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* __END_OF_JASPER_LICENSE__
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*/
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/*
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* Fixed-Point Number Class
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*
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* $Id: jas_fix.h,v 1.2 2008-05-26 09:41:51 vp153 Exp $
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*/
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#ifndef JAS_FIX_H
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#define JAS_FIX_H
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/******************************************************************************\
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* Includes.
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\******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <jasper/jas_config.h>
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#include <jasper/jas_types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/******************************************************************************\
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* Constants.
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\******************************************************************************/
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/* The representation of the value zero. */
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#define JAS_FIX_ZERO(fix_t, fracbits) \
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JAS_CAST(fix_t, 0)
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/* The representation of the value one. */
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#define JAS_FIX_ONE(fix_t, fracbits) \
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(JAS_CAST(fix_t, 1) << (fracbits))
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/* The representation of the value one half. */
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#define JAS_FIX_HALF(fix_t, fracbits) \
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(JAS_CAST(fix_t, 1) << ((fracbits) - 1))
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/******************************************************************************\
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* Conversion operations.
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\******************************************************************************/
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/* Convert an int to a fixed-point number. */
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#define JAS_INTTOFIX(fix_t, fracbits, x) \
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JAS_CAST(fix_t, (x) << (fracbits))
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/* Convert a fixed-point number to an int. */
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#define JAS_FIXTOINT(fix_t, fracbits, x) \
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JAS_CAST(int, (x) >> (fracbits))
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/* Convert a fixed-point number to a double. */
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#define JAS_FIXTODBL(fix_t, fracbits, x) \
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(JAS_CAST(double, x) / (JAS_CAST(fix_t, 1) << (fracbits)))
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/* Convert a double to a fixed-point number. */
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#define JAS_DBLTOFIX(fix_t, fracbits, x) \
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JAS_CAST(fix_t, ((x) * JAS_CAST(double, JAS_CAST(fix_t, 1) << (fracbits))))
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/******************************************************************************\
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* Basic arithmetic operations.
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* All other arithmetic operations are synthesized from these basic operations.
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* There are three macros for each type of arithmetic operation.
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* One macro always performs overflow/underflow checking, one never performs
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* overflow/underflow checking, and one is generic with its behavior
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* depending on compile-time flags.
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* Only the generic macros should be invoked directly by application code.
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\******************************************************************************/
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/* Calculate the sum of two fixed-point numbers. */
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#if !defined(DEBUG_OVERFLOW)
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#define JAS_FIX_ADD JAS_FIX_ADD_FAST
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#else
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#define JAS_FIX_ADD JAS_FIX_ADD_OFLOW
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#endif
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/* Calculate the sum of two fixed-point numbers without overflow checking. */
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#define JAS_FIX_ADD_FAST(fix_t, fracbits, x, y) ((x) + (y))
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/* Calculate the sum of two fixed-point numbers with overflow checking. */
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#define JAS_FIX_ADD_OFLOW(fix_t, fracbits, x, y) \
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((x) >= 0) ? \
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(((y) >= 0) ? ((x) + (y) >= 0 || JAS_FIX_OFLOW(), (x) + (y)) : \
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((x) + (y))) : \
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(((y) >= 0) ? ((x) + (y)) : ((x) + (y) < 0 || JAS_FIX_OFLOW(), \
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(x) + (y)))
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/* Calculate the product of two fixed-point numbers. */
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#if !defined(DEBUG_OVERFLOW)
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#define JAS_FIX_MUL JAS_FIX_MUL_FAST
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#else
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#define JAS_FIX_MUL JAS_FIX_MUL_OFLOW
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#endif
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/* Calculate the product of two fixed-point numbers without overflow
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checking. */
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#define JAS_FIX_MUL_FAST(fix_t, fracbits, bigfix_t, x, y) \
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JAS_CAST(fix_t, (JAS_CAST(bigfix_t, x) * JAS_CAST(bigfix_t, y)) >> \
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(fracbits))
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/* Calculate the product of two fixed-point numbers with overflow
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checking. */
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#define JAS_FIX_MUL_OFLOW(fix_t, fracbits, bigfix_t, x, y) \
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((JAS_CAST(bigfix_t, x) * JAS_CAST(bigfix_t, y) >> (fracbits)) == \
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JAS_CAST(fix_t, (JAS_CAST(bigfix_t, x) * JAS_CAST(bigfix_t, y) >> \
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(fracbits))) ? \
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JAS_CAST(fix_t, (JAS_CAST(bigfix_t, x) * JAS_CAST(bigfix_t, y) >> \
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(fracbits))) : JAS_FIX_OFLOW())
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/* Calculate the product of a fixed-point number and an int. */
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#if !defined(DEBUG_OVERFLOW)
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#define JAS_FIX_MULBYINT JAS_FIX_MULBYINT_FAST
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#else
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#define JAS_FIX_MULBYINT JAS_FIX_MULBYINT_OFLOW
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#endif
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/* Calculate the product of a fixed-point number and an int without overflow
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checking. */
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#define JAS_FIX_MULBYINT_FAST(fix_t, fracbits, x, y) \
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JAS_CAST(fix_t, ((x) * (y)))
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/* Calculate the product of a fixed-point number and an int with overflow
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checking. */
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#define JAS_FIX_MULBYINT_OFLOW(fix_t, fracbits, x, y) \
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JAS_FIX_MULBYINT_FAST(fix_t, fracbits, x, y)
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/* Calculate the quotient of two fixed-point numbers. */
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#if !defined(DEBUG_OVERFLOW)
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#define JAS_FIX_DIV JAS_FIX_DIV_FAST
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#else
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#define JAS_FIX_DIV JAS_FIX_DIV_UFLOW
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#endif
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/* Calculate the quotient of two fixed-point numbers without underflow
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checking. */
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#define JAS_FIX_DIV_FAST(fix_t, fracbits, bigfix_t, x, y) \
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JAS_CAST(fix_t, (JAS_CAST(bigfix_t, x) << (fracbits)) / (y))
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/* Calculate the quotient of two fixed-point numbers with underflow
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checking. */
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#define JAS_FIX_DIV_UFLOW(fix_t, fracbits, bigfix_t, x, y) \
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JAS_FIX_DIV_FAST(fix_t, fracbits, bigfix_t, x, y)
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/* Negate a fixed-point number. */
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#if !defined(DEBUG_OVERFLOW)
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#define JAS_FIX_NEG JAS_FIX_NEG_FAST
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#else
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#define JAS_FIX_NEG JAS_FIX_NEG_OFLOW
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#endif
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/* Negate a fixed-point number without overflow checking. */
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#define JAS_FIX_NEG_FAST(fix_t, fracbits, x) \
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(-(x))
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/* Negate a fixed-point number with overflow checking. */
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/* Yes, overflow is actually possible for two's complement representations,
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although highly unlikely to occur. */
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#define JAS_FIX_NEG_OFLOW(fix_t, fracbits, x) \
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(((x) < 0) ? (-(x) > 0 || JAS_FIX_OFLOW(), -(x)) : (-(x)))
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/* Perform an arithmetic shift left of a fixed-point number. */
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#if !defined(DEBUG_OVERFLOW)
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#define JAS_FIX_ASL JAS_FIX_ASL_FAST
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#else
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#define JAS_FIX_ASL JAS_FIX_ASL_OFLOW
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#endif
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/* Perform an arithmetic shift left of a fixed-point number without overflow
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checking. */
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#define JAS_FIX_ASL_FAST(fix_t, fracbits, x, n) \
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((x) << (n))
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/* Perform an arithmetic shift left of a fixed-point number with overflow
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checking. */
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#define JAS_FIX_ASL_OFLOW(fix_t, fracbits, x, n) \
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((((x) << (n)) >> (n)) == (x) || JAS_FIX_OFLOW(), (x) << (n))
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/* Perform an arithmetic shift right of a fixed-point number. */
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#if !defined(DEBUG_OVERFLOW)
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#define JAS_FIX_ASR JAS_FIX_ASR_FAST
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#else
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#define JAS_FIX_ASR JAS_FIX_ASR_UFLOW
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#endif
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/* Perform an arithmetic shift right of a fixed-point number without underflow
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checking. */
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#define JAS_FIX_ASR_FAST(fix_t, fracbits, x, n) \
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((x) >> (n))
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/* Perform an arithmetic shift right of a fixed-point number with underflow
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checking. */
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#define JAS_FIX_ASR_UFLOW(fix_t, fracbits, x, n) \
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JAS_FIX_ASR_FAST(fix_t, fracbits, x, n)
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/******************************************************************************\
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* Other basic arithmetic operations.
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\******************************************************************************/
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/* Calculate the difference between two fixed-point numbers. */
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#define JAS_FIX_SUB(fix_t, fracbits, x, y) \
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JAS_FIX_ADD(fix_t, fracbits, x, JAS_FIX_NEG(fix_t, fracbits, y))
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/* Add one fixed-point number to another. */
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#define JAS_FIX_PLUSEQ(fix_t, fracbits, x, y) \
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((x) = JAS_FIX_ADD(fix_t, fracbits, x, y))
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/* Subtract one fixed-point number from another. */
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#define JAS_FIX_MINUSEQ(fix_t, fracbits, x, y) \
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((x) = JAS_FIX_SUB(fix_t, fracbits, x, y))
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/* Multiply one fixed-point number by another. */
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#define JAS_FIX_MULEQ(fix_t, fracbits, bigfix_t, x, y) \
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((x) = JAS_FIX_MUL(fix_t, fracbits, bigfix_t, x, y))
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/******************************************************************************\
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* Miscellaneous operations.
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\******************************************************************************/
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/* Calculate the absolute value of a fixed-point number. */
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#define JAS_FIX_ABS(fix_t, fracbits, x) \
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(((x) >= 0) ? (x) : (JAS_FIX_NEG(fix_t, fracbits, x)))
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/* Is a fixed-point number an integer? */
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#define JAS_FIX_ISINT(fix_t, fracbits, x) \
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(JAS_FIX_FLOOR(fix_t, fracbits, x) == (x))
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/* Get the sign of a fixed-point number. */
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#define JAS_FIX_SGN(fix_t, fracbits, x) \
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((x) >= 0 ? 1 : (-1))
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/******************************************************************************\
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* Relational operations.
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\******************************************************************************/
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/* Compare two fixed-point numbers. */
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#define JAS_FIX_CMP(fix_t, fracbits, x, y) \
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((x) > (y) ? 1 : (((x) == (y)) ? 0 : (-1)))
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/* Less than. */
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#define JAS_FIX_LT(fix_t, fracbits, x, y) \
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((x) < (y))
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/* Less than or equal. */
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#define JAS_FIX_LTE(fix_t, fracbits, x, y) \
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((x) <= (y))
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/* Greater than. */
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#define JAS_FIX_GT(fix_t, fracbits, x, y) \
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((x) > (y))
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/* Greater than or equal. */
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#define JAS_FIX_GTE(fix_t, fracbits, x, y) \
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((x) >= (y))
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/******************************************************************************\
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* Rounding functions.
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\******************************************************************************/
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/* Round a fixed-point number to the nearest integer. */
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#define JAS_FIX_ROUND(fix_t, fracbits, x) \
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(((x) < 0) ? JAS_FIX_FLOOR(fix_t, fracbits, JAS_FIX_ADD(fix_t, fracbits, \
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(x), JAS_FIX_HALF(fix_t, fracbits))) : \
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JAS_FIX_NEG(fix_t, fracbits, JAS_FIX_FLOOR(fix_t, fracbits, \
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JAS_FIX_ADD(fix_t, fracbits, (-(x)), JAS_FIX_HALF(fix_t, fracbits)))))
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/* Round a fixed-point number to the nearest integer in the direction of
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negative infinity (i.e., the floor function). */
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#define JAS_FIX_FLOOR(fix_t, fracbits, x) \
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((x) & (~((JAS_CAST(fix_t, 1) << (fracbits)) - 1)))
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/* Round a fixed-point number to the nearest integer in the direction
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of zero. */
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#define JAS_FIX_TRUNC(fix_t, fracbits, x) \
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(((x) >= 0) ? JAS_FIX_FLOOR(fix_t, fracbits, x) : \
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JAS_FIX_CEIL(fix_t, fracbits, x))
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/******************************************************************************\
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* The below macros are for internal library use only. Do not invoke them
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* directly in application code.
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\******************************************************************************/
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/* Handle overflow. */
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#define JAS_FIX_OFLOW() \
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jas_eprintf("overflow error: file %s, line %d\n", __FILE__, __LINE__)
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/* Handle underflow. */
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#define JAS_FIX_UFLOW() \
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jas_eprintf("underflow error: file %s, line %d\n", __FILE__, __LINE__)
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#ifdef __cplusplus
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}
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#endif
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#endif
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