corrade-vassal – Blame information for rev 1

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1 vero 1 /*
2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
3 * Copyright (c) 2002-2007, Professor Benoit Macq
4 * Copyright (c) 2001-2003, David Janssens
5 * Copyright (c) 2002-2003, Yannick Verschueren
6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31  
32 #ifndef __MQC_H
33 #define __MQC_H
34 /**
35 @file mqc.h
36 @brief Implementation of an MQ-Coder (MQC)
37  
38 The functions in MQC.C have for goal to realize the MQ-coder operations. The functions
39 in MQC.C are used by some function in T1.C.
40 */
41  
42 /** @defgroup MQC MQC - Implementation of an MQ-Coder */
43 /*@{*/
44  
45 /**
46 This struct defines the state of a context.
47 */
48 typedef struct opj_mqc_state {
49 /** the probability of the Least Probable Symbol (0.75->0x8000, 1.5->0xffff) */
50 unsigned int qeval;
51 /** the Most Probable Symbol (0 or 1) */
52 int mps;
53 /** next state if the next encoded symbol is the MPS */
54 struct opj_mqc_state *nmps;
55 /** next state if the next encoded symbol is the LPS */
56 struct opj_mqc_state *nlps;
57 } opj_mqc_state_t;
58  
59 #define MQC_NUMCTXS 19
60  
61 /**
62 MQ coder
63 */
64 typedef struct opj_mqc {
65 unsigned int c;
66 unsigned int a;
67 unsigned int ct;
68 unsigned char *bp;
69 unsigned char *start;
70 unsigned char *end;
71 opj_mqc_state_t *ctxs[MQC_NUMCTXS];
72 opj_mqc_state_t **curctx;
73 #ifdef MQC_PERF_OPT
74 unsigned char *buffer;
75 #endif
76 } opj_mqc_t;
77  
78 /** @name Exported functions */
79 /*@{*/
80 /* ----------------------------------------------------------------------- */
81 /**
82 Create a new MQC handle
83 @return Returns a new MQC handle if successful, returns NULL otherwise
84 */
85 opj_mqc_t* mqc_create(void);
86 /**
87 Destroy a previously created MQC handle
88 @param mqc MQC handle to destroy
89 */
90 void mqc_destroy(opj_mqc_t *mqc);
91 /**
92 Return the number of bytes written/read since initialisation
93 @param mqc MQC handle
94 @return Returns the number of bytes already encoded
95 */
96 int mqc_numbytes(opj_mqc_t *mqc);
97 /**
98 Reset the states of all the context of the coder/decoder
99 (each context is set to a state where 0 and 1 are more or less equiprobable)
100 @param mqc MQC handle
101 */
102 void mqc_resetstates(opj_mqc_t *mqc);
103 /**
104 Set the state of a particular context
105 @param mqc MQC handle
106 @param ctxno Number that identifies the context
107 @param msb The MSB of the new state of the context
108 @param prob Number that identifies the probability of the symbols for the new state of the context
109 */
110 void mqc_setstate(opj_mqc_t *mqc, int ctxno, int msb, int prob);
111 /**
112 Initialize the encoder
113 @param mqc MQC handle
114 @param bp Pointer to the start of the buffer where the bytes will be written
115 */
116 void mqc_init_enc(opj_mqc_t *mqc, unsigned char *bp);
117 /**
118 Set the current context used for coding/decoding
119 @param mqc MQC handle
120 @param ctxno Number that identifies the context
121 */
122 #define mqc_setcurctx(mqc, ctxno) (mqc)->curctx = &(mqc)->ctxs[(int)(ctxno)]
123 /**
124 Encode a symbol using the MQ-coder
125 @param mqc MQC handle
126 @param d The symbol to be encoded (0 or 1)
127 */
128 void mqc_encode(opj_mqc_t *mqc, int d);
129 /**
130 Flush the encoder, so that all remaining data is written
131 @param mqc MQC handle
132 */
133 void mqc_flush(opj_mqc_t *mqc);
134 /**
135 BYPASS mode switch, initialization operation.
136 JPEG 2000 p 505.
137 <h2>Not fully implemented and tested !!</h2>
138 @param mqc MQC handle
139 */
140 void mqc_bypass_init_enc(opj_mqc_t *mqc);
141 /**
142 BYPASS mode switch, coding operation.
143 JPEG 2000 p 505.
144 <h2>Not fully implemented and tested !!</h2>
145 @param mqc MQC handle
146 @param d The symbol to be encoded (0 or 1)
147 */
148 void mqc_bypass_enc(opj_mqc_t *mqc, int d);
149 /**
150 BYPASS mode switch, flush operation
151 <h2>Not fully implemented and tested !!</h2>
152 @param mqc MQC handle
153 @return Returns 1 (always)
154 */
155 int mqc_bypass_flush_enc(opj_mqc_t *mqc);
156 /**
157 RESET mode switch
158 @param mqc MQC handle
159 */
160 void mqc_reset_enc(opj_mqc_t *mqc);
161 /**
162 RESTART mode switch (TERMALL)
163 @param mqc MQC handle
164 @return Returns 1 (always)
165 */
166 int mqc_restart_enc(opj_mqc_t *mqc);
167 /**
168 RESTART mode switch (TERMALL) reinitialisation
169 @param mqc MQC handle
170 */
171 void mqc_restart_init_enc(opj_mqc_t *mqc);
172 /**
173 ERTERM mode switch (PTERM)
174 @param mqc MQC handle
175 */
176 void mqc_erterm_enc(opj_mqc_t *mqc);
177 /**
178 SEGMARK mode switch (SEGSYM)
179 @param mqc MQC handle
180 */
181 void mqc_segmark_enc(opj_mqc_t *mqc);
182 /**
183 Initialize the decoder
184 @param mqc MQC handle
185 @param bp Pointer to the start of the buffer from which the bytes will be read
186 @param len Length of the input buffer
187 */
188 void mqc_init_dec(opj_mqc_t *mqc, unsigned char *bp, int len);
189 /**
190 Decode a symbol
191 @param mqc MQC handle
192 @return Returns the decoded symbol (0 or 1)
193 */
194 int mqc_decode(opj_mqc_t *const mqc);
195 /* ----------------------------------------------------------------------- */
196 /*@}*/
197  
198 /*@}*/
199  
200 #endif /* __MQC_H */