jpc_tagtree.h

/*
 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2002 Michael David Adams.
 * All rights reserved.
 */
 
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 * Copyright (c) 2001-2006 Michael David Adams
 * Copyright (c) 1999-2000 Image Power, Inc.
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/*
 * Tag Tree Library
 *
 * $Id$
 */
 
#ifndef JPC_TAGTREE_H
#define JPC_TAGTREE_H
 
/******************************************************************************\
* Includes
\******************************************************************************/
 
#include <stdio.h>
 
#include "jpc_bs.h"
 
/******************************************************************************\
* Constants
\******************************************************************************/
 
/* The maximum allowable depth for a tag tree. */
#define JPC_TAGTREE_MAXDEPTH    32
 
/******************************************************************************\
* Types
\******************************************************************************/
 
/*
 * Tag tree node.
 */
 
typedef struct jpc_tagtreenode_ {
 
        /* The parent of this node. */
        struct jpc_tagtreenode_ *parent_;
 
        /* The value associated with this node. */
        int value_;
 
        /* The lower bound on the value associated with this node. */
        int low_;
 
        /* A flag indicating if the value is known exactly. */
        int known_;
 
} jpc_tagtreenode_t;
 
/*
 * Tag tree.
 */
 
typedef struct {
 
        /* The number of leaves in the horizontal direction. */
        int numleafsh_;
 
        /* The number of leaves in the vertical direction. */
        int numleafsv_;
 
        /* The total number of nodes in the tree. */
        int numnodes_;
 
        /* The nodes. */
        jpc_tagtreenode_t *nodes_;
 
} jpc_tagtree_t;
 
/******************************************************************************\
* Functions.
\******************************************************************************/
 
/* Create a tag tree. */
jpc_tagtree_t *jpc_tagtree_create(int numleafsh, int numleafsv);
 
/* Destroy a tag tree. */
void jpc_tagtree_destroy(jpc_tagtree_t *tree);
 
/* Copy data from one tag tree to another. */
void jpc_tagtree_copy(jpc_tagtree_t *dsttree, const jpc_tagtree_t *srctree);
 
/* Reset the tag tree state. */
void jpc_tagtree_reset(jpc_tagtree_t *tree);
 
/* Set the value associated with a particular leaf node of a tag tree. */
void jpc_tagtree_setvalue(jpc_tagtree_t *tree, jpc_tagtreenode_t *leaf,
  int value);
 
/* Get a pointer to a particular leaf node. */
JAS_ATTRIBUTE_PURE
jpc_tagtreenode_t *jpc_tagtree_getleaf(jpc_tagtree_t *tree, int n);
 
/* Invoke the tag tree decoding procedure. */
int jpc_tagtree_decode(jpc_tagtree_t *tree, jpc_tagtreenode_t *leaf,
  int threshold, jpc_bitstream_t *in);
 
/* Invoke the tag tree encoding procedure. */
int jpc_tagtree_encode(jpc_tagtree_t *tree, jpc_tagtreenode_t *leaf,
  int threshold, jpc_bitstream_t *out);
 
/* Dump a tag tree (for debugging purposes). */
void jpc_tagtree_dump(const jpc_tagtree_t *tree, FILE *out);
 
#endif