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>
9 * Copyright (c) 2011-2012, Centre National d'Etudes Spatiales (CNES), France
10 * Copyright (c) 2012, CS Systemes d'Information, France
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39 @brief Implementation of a tag-tree coder (TGT)
41 The functions in TGT.C have for goal to realize a tag-tree coder. The functions in TGT.C
42 are used by some function in T2.C.
45 /** @defgroup TGT TGT - Implementation of a tag-tree coder */
51 typedef struct opj_tgt_node {
52 struct opj_tgt_node *parent;
61 typedef struct opj_tgt_tree
66 opj_tgt_node_t *nodes;
67 OPJ_UINT32 nodes_size; /* maximum size taken by nodes */
71 /** @name Exported functions */
73 /* ----------------------------------------------------------------------- */
76 @param numleafsh Width of the array of leafs of the tree
77 @param numleafsv Height of the array of leafs of the tree
78 @return Returns a new tag-tree if successful, returns NULL otherwise
80 opj_tgt_tree_t *opj_tgt_create(OPJ_UINT32 numleafsh, OPJ_UINT32 numleafsv);
83 * Reinitialises a tag-tree from an exixting one.
85 * @param p_tree the tree to reinitialize.
86 * @param p_num_leafs_h the width of the array of leafs of the tree
87 * @param p_num_leafs_v the height of the array of leafs of the tree
88 * @return a new tag-tree if successful, NULL otherwise
90 opj_tgt_tree_t *opj_tgt_init(opj_tgt_tree_t * p_tree,
91 OPJ_UINT32 p_num_leafs_h,
92 OPJ_UINT32 p_num_leafs_v);
94 Destroy a tag-tree, liberating memory
95 @param tree Tag-tree to destroy
97 void opj_tgt_destroy(opj_tgt_tree_t *tree);
99 Reset a tag-tree (set all leaves to 0)
100 @param tree Tag-tree to reset
102 void opj_tgt_reset(opj_tgt_tree_t *tree);
104 Set the value of a leaf of a tag-tree
105 @param tree Tag-tree to modify
106 @param leafno Number that identifies the leaf to modify
107 @param value New value of the leaf
109 void opj_tgt_setvalue(opj_tgt_tree_t *tree,
113 Encode the value of a leaf of the tag-tree up to a given threshold
114 @param bio Pointer to a BIO handle
115 @param tree Tag-tree to modify
116 @param leafno Number that identifies the leaf to encode
117 @param threshold Threshold to use when encoding value of the leaf
119 void opj_tgt_encode(opj_bio_t *bio,
120 opj_tgt_tree_t *tree,
122 OPJ_INT32 threshold);
124 Decode the value of a leaf of the tag-tree up to a given threshold
125 @param bio Pointer to a BIO handle
126 @param tree Tag-tree to decode
127 @param leafno Number that identifies the leaf to decode
128 @param threshold Threshold to use when decoding value of the leaf
129 @return Returns 1 if the node's value < threshold, returns 0 otherwise
131 OPJ_UINT32 opj_tgt_decode(opj_bio_t *bio,
132 opj_tgt_tree_t *tree,
134 OPJ_INT32 threshold);
135 /* ----------------------------------------------------------------------- */