My Project  2.0.17
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
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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_config.h"
78 #include "jasper/jas_types.h"
79 #include "jasper/jas_fix.h"
80 #include "jasper/jas_math.h"
81 
82 /******************************************************************************\
83 * Basic parameters of the fixed-point type.
84 \******************************************************************************/
85 
86 /* The integral type used to represent a fixed-point number. This
87  type must be capable of representing values from -(2^31) to 2^31-1
88  (inclusive). */
89 #ifdef JAS_ENABLE_32BIT
90 typedef int_least32_t jpc_fix_t;
91 #else
92 typedef int_fast32_t jpc_fix_t;
93 #endif
94 
95 /* The integral type used to respresent higher-precision intermediate results.
96  This type should be capable of representing values from -(2^63) to 2^63-1
97  (inclusive). */
98 typedef int_fast64_t jpc_fix_big_t;
99 
100 /* The number of bits used for the fractional part of a fixed-point number. */
101 #define JPC_FIX_FRACBITS 13
102 
103 /******************************************************************************\
104 * Instantiations of the generic fixed-point number macros for the
105 * parameters given above. (Too bad C does not support templates, eh?)
106 * The purpose of these macros is self-evident if one examines the
107 * corresponding macros in the jasper/jas_fix.h header file.
108 \******************************************************************************/
109 
110 #define JPC_FIX_ZERO JAS_FIX_ZERO(jpc_fix_t, JPC_FIX_FRACBITS)
111 #define JPC_FIX_ONE JAS_FIX_ONE(jpc_fix_t, JPC_FIX_FRACBITS)
112 #define JPC_FIX_HALF JAS_FIX_HALF(jpc_fix_t, JPC_FIX_FRACBITS)
113 
114 #define jpc_inttofix(x) JAS_INTTOFIX(jpc_fix_t, JPC_FIX_FRACBITS, x)
115 #define jpc_fixtoint(x) JAS_FIXTOINT(jpc_fix_t, JPC_FIX_FRACBITS, x)
116 #define jpc_fixtodbl(x) JAS_FIXTODBL(jpc_fix_t, JPC_FIX_FRACBITS, x)
117 #define jpc_dbltofix(x) JAS_DBLTOFIX(jpc_fix_t, JPC_FIX_FRACBITS, x)
118 
119 JAS_ATTRIBUTE_CONST
120 static inline jpc_fix_t jpc_fix_add(jpc_fix_t x, jpc_fix_t y)
121 {
122  return JAS_FIX_ADD(jpc_fix_t, JPC_FIX_FRACBITS, x, y);
123 }
124 
125 JAS_ATTRIBUTE_CONST
126 static inline jpc_fix_t jpc_fix_sub(jpc_fix_t x, jpc_fix_t y)
127 {
128  return JAS_FIX_SUB(jpc_fix_t, JPC_FIX_FRACBITS, x, y);
129 }
130 
131 JAS_ATTRIBUTE_CONST
132 static inline jpc_fix_t jpc_fix_mul(jpc_fix_big_t x, jpc_fix_big_t y)
133 {
134  return JAS_FIX_MUL(jpc_fix_t, JPC_FIX_FRACBITS, jpc_fix_big_t, x, y);
135 }
136 
137 #define jpc_fix_mulbyint(x, y) \
138  JAS_FIX_MULBYINT(jpc_fix_t, JPC_FIX_FRACBITS, x, y)
139 
140 JAS_ATTRIBUTE_CONST
141 static inline jpc_fix_t jpc_fix_div(jpc_fix_big_t x, jpc_fix_t y)
142 {
143  return JAS_FIX_DIV(jpc_fix_t, JPC_FIX_FRACBITS, jpc_fix_big_t, x, y);
144 }
145 
146 JAS_ATTRIBUTE_CONST
147 static inline jpc_fix_t jpc_fix_neg(jpc_fix_big_t x)
148 {
149  return JAS_FIX_NEG(jpc_fix_t, JPC_FIX_FRACBITS, x);
150 }
151 
152 //#define jpc_fix_asl(x, n) JAS_FIX_ASL(jpc_fix_t, JPC_FIX_FRACBITS, x, n)
153 //#define jpc_fix_asr(x, n) JAS_FIX_ASR(jpc_fix_t, JPC_FIX_FRACBITS, x, n)
154 #define jpc_fix_asl jas_fast32_asl
155 #define jpc_fix_asr jas_fast32_asr
156 
157 #define jpc_fix_pluseq(x, y) JAS_FIX_PLUSEQ(jpc_fix_t, JPC_FIX_FRACBITS, x, y)
158 #define jpc_fix_minuseq(x, y) JAS_FIX_MINUSEQ(jpc_fix_t, JPC_FIX_FRACBITS, x, y)
159 #define jpc_fix_muleq(x, y) \
160  JAS_FIX_MULEQ(jpc_fix_t, JPC_FIX_FRACBITS, jpc_fix_big_t, x, y)
161 
162 #define jpc_fix_abs(x) JAS_FIX_ABS(jpc_fix_t, JPC_FIX_FRACBITS, x)
163 #define jpc_fix_isint(x) JAS_FIX_ISINT(jpc_fix_t, JPC_FIX_FRACBITS, x)
164 #define jpc_fix_sgn(x) JAS_FIX_SGN(jpc_fix_t, JPC_FIX_FRACBITS, x)
165 #define jpc_fix_round(x) JAS_FIX_ROUND(jpc_fix_t, JPC_FIX_FRACBITS, x)
166 #define jpc_fix_floor(x) JAS_FIX_FLOOR(jpc_fix_t, JPC_FIX_FRACBITS, x)
167 #define jpc_fix_trunc(x) JAS_FIX_TRUNC(jpc_fix_t, JPC_FIX_FRACBITS, x)
168 
169 /******************************************************************************\
170 * Extra macros for convenience.
171 \******************************************************************************/
172 
173 /* Compute the sum of three fixed-point numbers. */
174 #define jpc_fix_add3(x, y, z) jpc_fix_add(jpc_fix_add(x, y), z)
175 
176 #endif