corrade-vassal – Rev 1
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/*
* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
* Copyright (c) 2002-2007, Professor Benoit Macq
* Copyright (c) 2001-2003, David Janssens
* Copyright (c) 2002-2003, Yannick Verschueren
* Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
* Copyright (c) 2005, Herve Drolon, FreeImage Team
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "opj_includes.h"
/*
==========================================================
Tag-tree coder interface
==========================================================
*/
opj_tgt_tree_t *tgt_create(int numleafsh, int numleafsv) {
int nplh[32];
int nplv[32];
opj_tgt_node_t *node = NULL;
opj_tgt_node_t *parentnode = NULL;
opj_tgt_node_t *parentnode0 = NULL;
opj_tgt_tree_t *tree = NULL;
int i, j, k;
int numlvls;
int n;
tree = (opj_tgt_tree_t *) opj_malloc(sizeof(opj_tgt_tree_t));
if(!tree) return NULL;
tree->numleafsh = numleafsh;
tree->numleafsv = numleafsv;
numlvls = 0;
nplh[0] = numleafsh;
nplv[0] = numleafsv;
tree->numnodes = 0;
do {
n = nplh[numlvls] * nplv[numlvls];
nplh[numlvls + 1] = (nplh[numlvls] + 1) / 2;
nplv[numlvls + 1] = (nplv[numlvls] + 1) / 2;
tree->numnodes += n;
++numlvls;
} while (n > 1);
/* ADD */
if (tree->numnodes == 0) {
opj_free(tree);
return NULL;
}
tree->nodes = (opj_tgt_node_t*) opj_calloc(tree->numnodes, sizeof(opj_tgt_node_t));
if(!tree->nodes) {
opj_free(tree);
return NULL;
}
node = tree->nodes;
parentnode = &tree->nodes[tree->numleafsh * tree->numleafsv];
parentnode0 = parentnode;
for (i = 0; i < numlvls - 1; ++i) {
for (j = 0; j < nplv[i]; ++j) {
k = nplh[i];
while (--k >= 0) {
node->parent = parentnode;
++node;
if (--k >= 0) {
node->parent = parentnode;
++node;
}
++parentnode;
}
if ((j & 1) || j == nplv[i] - 1) {
parentnode0 = parentnode;
} else {
parentnode = parentnode0;
parentnode0 += nplh[i];
}
}
}
node->parent = 0;
tgt_reset(tree);
return tree;
}
void tgt_destroy(opj_tgt_tree_t *tree) {
opj_free(tree->nodes);
opj_free(tree);
}
void tgt_reset(opj_tgt_tree_t *tree) {
int i;
if (NULL == tree)
return;
for (i = 0; i < tree->numnodes; i++) {
tree->nodes[i].value = 999;
tree->nodes[i].low = 0;
tree->nodes[i].known = 0;
}
}
void tgt_setvalue(opj_tgt_tree_t *tree, int leafno, int value) {
opj_tgt_node_t *node;
node = &tree->nodes[leafno];
while (node && node->value > value) {
node->value = value;
node = node->parent;
}
}
void tgt_encode(opj_bio_t *bio, opj_tgt_tree_t *tree, int leafno, int threshold) {
opj_tgt_node_t *stk[31];
opj_tgt_node_t **stkptr;
opj_tgt_node_t *node;
int low;
stkptr = stk;
node = &tree->nodes[leafno];
while (node->parent) {
*stkptr++ = node;
node = node->parent;
}
low = 0;
for (;;) {
if (low > node->low) {
node->low = low;
} else {
low = node->low;
}
while (low < threshold) {
if (low >= node->value) {
if (!node->known) {
bio_write(bio, 1, 1);
node->known = 1;
}
break;
}
bio_write(bio, 0, 1);
++low;
}
node->low = low;
if (stkptr == stk)
break;
node = *--stkptr;
}
}
int tgt_decode(opj_bio_t *bio, opj_tgt_tree_t *tree, int leafno, int threshold) {
opj_tgt_node_t *stk[31];
opj_tgt_node_t **stkptr;
opj_tgt_node_t *node;
int low;
stkptr = stk;
node = &tree->nodes[leafno];
while (node->parent) {
*stkptr++ = node;
node = node->parent;
}
low = 0;
for (;;) {
if (low > node->low) {
node->low = low;
} else {
low = node->low;
}
while (low < threshold && low < node->value) {
if (bio_read(bio, 1)) {
node->value = low;
} else {
++low;
}
}
node->low = low;
if (stkptr == stk) {
break;
}
node = *--stkptr;
}
return (node->value < threshold) ? 1 : 0;
}