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 * Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr>
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37 @brief Implementation of a tag-tree coder (TGT)
39 The functions in TGT.C have for goal to realize a tag-tree coder. The functions in TGT.C
40 are used by some function in T2.C.
43 /** @defgroup TGT TGT - Implementation of a tag-tree coder */
49 typedef struct opj_tgt_node {
50 struct opj_tgt_node *parent;
59 typedef struct opj_tgt_tree
64 opj_tgt_node_t *nodes;
65 OPJ_UINT32 nodes_size; /* maximum size taken by nodes */
69 /** @name Exported functions */
71 /* ----------------------------------------------------------------------- */
74 @param numleafsh Width of the array of leafs of the tree
75 @param numleafsv Height of the array of leafs of the tree
76 @return Returns a new tag-tree if successful, returns NULL otherwise
78 opj_tgt_tree_t *tgt_create(int numleafsh, int numleafsv);
79 opj_tgt_tree_t *tgt_create_v2(OPJ_UINT32 numleafsh, OPJ_UINT32 numleafsv);
82 * Reinitialises a tag-tree from an exixting one.
84 * @param p_tree the tree to reinitialize.
85 * @param p_num_leafs_h the width of the array of leafs of the tree
86 * @param p_num_leafs_v the height of the array of leafs of the tree
87 * @return a new tag-tree if successful, NULL otherwise
89 opj_tgt_tree_t *tgt_init(opj_tgt_tree_t * p_tree, OPJ_UINT32 p_num_leafs_h, OPJ_UINT32 p_num_leafs_v);
93 Destroy a tag-tree, liberating memory
94 @param tree Tag-tree to destroy
96 void tgt_destroy(opj_tgt_tree_t *tree);
98 Reset a tag-tree (set all leaves to 0)
99 @param tree Tag-tree to reset
101 void tgt_reset(opj_tgt_tree_t *tree);
103 Set the value of a leaf of a tag-tree
104 @param tree Tag-tree to modify
105 @param leafno Number that identifies the leaf to modify
106 @param value New value of the leaf
108 void tgt_setvalue(opj_tgt_tree_t *tree, OPJ_UINT32 leafno, OPJ_INT32 value);
110 Encode the value of a leaf of the tag-tree up to a given threshold
111 @param bio Pointer to a BIO handle
112 @param tree Tag-tree to modify
113 @param leafno Number that identifies the leaf to encode
114 @param threshold Threshold to use when encoding value of the leaf
116 void tgt_encode(opj_bio_t *bio, opj_tgt_tree_t *tree, OPJ_UINT32 leafno, OPJ_INT32 threshold);
118 Decode the value of a leaf of the tag-tree up to a given threshold
119 @param bio Pointer to a BIO handle
120 @param tree Tag-tree to decode
121 @param leafno Number that identifies the leaf to decode
122 @param threshold Threshold to use when decoding value of the leaf
123 @return Returns 1 if the node's value < threshold, returns 0 otherwise
125 OPJ_UINT32 tgt_decode(opj_bio_t *bio, opj_tgt_tree_t *tree, OPJ_UINT32 leafno, OPJ_INT32 threshold);
126 /* ----------------------------------------------------------------------- */