­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ jpc_fix.h Source File
jpc_fix.h
1 /*
2  * Copyright (c) 1999-2000 Image Power, Inc. and the University of
3  * British Columbia.
4  * Copyright (c) 2001-2002 Michael David Adams.
5  * All rights reserved.
6  */
7 
8 /* __START_OF_JASPER_LICENSE__
9  *
10  * JasPer License Version 2.0
11  *
12  * Copyright (c) 2001-2006 Michael David Adams
13  * Copyright (c) 1999-2000 Image Power, Inc.
14  * Copyright (c) 1999-2000 The University of British Columbia
15  *
16  * All rights reserved.
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18  * Permission is hereby granted, free of charge, to any person (the
19  * "User") obtaining a copy of this software and associated documentation
20  * files (the "Software"), to deal in the Software without restriction,
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22  * publish, distribute, and/or sell copies of the Software, and to permit
23  * persons to whom the Software is furnished to do so, subject to the
24  * following conditions:
25  *
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27  * includes the disclaimer below) shall be included in all copies or
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60  *
61  * __END_OF_JASPER_LICENSE__
62  */
63 
64 /*
65  * Fixed-Point Number Class
66  *
67  * $Id$
68  */
69 
70 #ifndef JPC_FIX_H
71 #define JPC_FIX_H
72 
73 /******************************************************************************\
74 * Includes.
75 \******************************************************************************/
76 
77 #include "jasper/jas_types.h"
78 #include "jasper/jas_fix.h"
79 
80 /******************************************************************************\
81 * Basic parameters of the fixed-point type.
82 \******************************************************************************/
83 
84 /* The integral type used to represent a fixed-point number. This
85  type must be capable of representing values from -(2^31) to 2^31-1
86  (inclusive). */
87 typedef int_fast32_t jpc_fix_t;
88 
89 /* The integral type used to respresent higher-precision intermediate results.
90  This type should be capable of representing values from -(2^63) to 2^63-1
91  (inclusive). */
92 typedef int_fast64_t jpc_fix_big_t;
93 
94 /* The number of bits used for the fractional part of a fixed-point number. */
95 #define JPC_FIX_FRACBITS 13
96 
97 /******************************************************************************\
98 * Instantiations of the generic fixed-point number macros for the
99 * parameters given above. (Too bad C does not support templates, eh?)
100 * The purpose of these macros is self-evident if one examines the
101 * corresponding macros in the jasper/jas_fix.h header file.
102 \******************************************************************************/
103 
104 #define JPC_FIX_ZERO JAS_FIX_ZERO(jpc_fix_t, JPC_FIX_FRACBITS)
105 #define JPC_FIX_ONE JAS_FIX_ONE(jpc_fix_t, JPC_FIX_FRACBITS)
106 #define JPC_FIX_HALF JAS_FIX_HALF(jpc_fix_t, JPC_FIX_FRACBITS)
107 
108 #define jpc_inttofix(x) JAS_INTTOFIX(jpc_fix_t, JPC_FIX_FRACBITS, x)
109 #define jpc_fixtoint(x) JAS_FIXTOINT(jpc_fix_t, JPC_FIX_FRACBITS, x)
110 #define jpc_fixtodbl(x) JAS_FIXTODBL(jpc_fix_t, JPC_FIX_FRACBITS, x)
111 #define jpc_dbltofix(x) JAS_DBLTOFIX(jpc_fix_t, JPC_FIX_FRACBITS, x)
112 
113 #define jpc_fix_add(x, y) JAS_FIX_ADD(jpc_fix_t, JPC_FIX_FRACBITS, x, y)
114 #define jpc_fix_sub(x, y) JAS_FIX_SUB(jpc_fix_t, JPC_FIX_FRACBITS, x, y)
115 #define jpc_fix_mul(x, y) \
116  JAS_FIX_MUL(jpc_fix_t, JPC_FIX_FRACBITS, jpc_fix_big_t, x, y)
117 #define jpc_fix_mulbyint(x, y) \
118  JAS_FIX_MULBYINT(jpc_fix_t, JPC_FIX_FRACBITS, x, y)
119 #define jpc_fix_div(x, y) \
120  JAS_FIX_DIV(jpc_fix_t, JPC_FIX_FRACBITS, jpc_fix_big_t, x, y)
121 #define jpc_fix_neg(x) JAS_FIX_NEG(jpc_fix_t, JPC_FIX_FRACBITS, x)
122 //#define jpc_fix_asl(x, n) JAS_FIX_ASL(jpc_fix_t, JPC_FIX_FRACBITS, x, n)
123 //#define jpc_fix_asr(x, n) JAS_FIX_ASR(jpc_fix_t, JPC_FIX_FRACBITS, x, n)
124 #define jpc_fix_asl jas_fast32_asl
125 #define jpc_fix_asr jas_fast32_asr
126 
127 #define jpc_fix_pluseq(x, y) JAS_FIX_PLUSEQ(jpc_fix_t, JPC_FIX_FRACBITS, x, y)
128 #define jpc_fix_minuseq(x, y) JAS_FIX_MINUSEQ(jpc_fix_t, JPC_FIX_FRACBITS, x, y)
129 #define jpc_fix_muleq(x, y) \
130  JAS_FIX_MULEQ(jpc_fix_t, JPC_FIX_FRACBITS, jpc_fix_big_t, x, y)
131 
132 #define jpc_fix_abs(x) JAS_FIX_ABS(jpc_fix_t, JPC_FIX_FRACBITS, x)
133 #define jpc_fix_isint(x) JAS_FIX_ISINT(jpc_fix_t, JPC_FIX_FRACBITS, x)
134 #define jpc_fix_sgn(x) JAS_FIX_SGN(jpc_fix_t, JPC_FIX_FRACBITS, x)
135 #define jpc_fix_round(x) JAS_FIX_ROUND(jpc_fix_t, JPC_FIX_FRACBITS, x)
136 #define jpc_fix_floor(x) JAS_FIX_FLOOR(jpc_fix_t, JPC_FIX_FRACBITS, x)
137 #define jpc_fix_trunc(x) JAS_FIX_TRUNC(jpc_fix_t, JPC_FIX_FRACBITS, x)
138 
139 /******************************************************************************\
140 * Extra macros for convenience.
141 \******************************************************************************/
142 
143 /* Compute the sum of three fixed-point numbers. */
144 #define jpc_fix_add3(x, y, z) jpc_fix_add(jpc_fix_add(x, y), z)
145 
146 #endif