tgt.c File Reference

#include "opj_includes.h"

Functions
opj_tgt_tree_t *	tgt_create (int numleafsh, int numleafsv)
	Create a tag-tree.
void	tgt_destroy (opj_tgt_tree_t *tree)
	Destroy a tag-tree, liberating memory.
void	tgt_reset (opj_tgt_tree_t *tree)
	Reset a tag-tree (set all leaves to 0).
void	tgt_setvalue (opj_tgt_tree_t *tree, int leafno, int value)
	Set the value of a leaf of a tag-tree.
void	tgt_encode (opj_bio_t *bio, opj_tgt_tree_t *tree, int leafno, int threshold)
	Encode the value of a leaf of the tag-tree up to a given threshold.
int	tgt_decode (opj_bio_t *bio, opj_tgt_tree_t *tree, int leafno, int threshold)
	Decode the value of a leaf of the tag-tree up to a given threshold.

Function Documentation

tgt_create()

opj_tgt_tree_t * tgt_create	(	int	numleafsh,
		int	numleafsv )

Create a tag-tree.

Parameters

numleafsh	Width of the array of leafs of the tree
numleafsv	Height of the array of leafs of the tree

Returns

Returns a new tag-tree if successful, returns NULL otherwise

References opj_tgt_tree::nodes, opj_tgt_tree::numleafsh, opj_tgt_tree::numleafsv, opj_tgt_tree::numnodes, opj_calloc, opj_free, opj_malloc, opj_tgt_node::parent, and tgt_reset().

Referenced by tcd_init_encode(), tcd_malloc_decode_tile(), and tcd_malloc_encode().

tgt_decode()

int tgt_decode	(	opj_bio_t *	bio,
		opj_tgt_tree_t *	tree,
		int	leafno,
		int	threshold )

Decode the value of a leaf of the tag-tree up to a given threshold.

Parameters

bio	Pointer to a BIO handle
tree	Tag-tree to decode
leafno	Number that identifies the leaf to decode
threshold	Threshold to use when decoding value of the leaf

Returns

Returns 1 if the node's value < threshold, returns 0 otherwise

References bio_read(), opj_tgt_node::low, opj_tgt_tree::nodes, opj_tgt_node::parent, and opj_tgt_node::value.

Referenced by t2_decode_packet().

tgt_destroy()

void tgt_destroy

(

opj_tgt_tree_t *

tree

)

Destroy a tag-tree, liberating memory.

Parameters

tree	Tag-tree to destroy

References opj_tgt_tree::nodes, and opj_free.

Referenced by tcd_free_decode_tile(), tcd_free_encode(), and tcd_init_encode().

tgt_encode()

void tgt_encode	(	opj_bio_t *	bio,
		opj_tgt_tree_t *	tree,
		int	leafno,
		int	threshold )

Encode the value of a leaf of the tag-tree up to a given threshold.

Parameters

bio	Pointer to a BIO handle
tree	Tag-tree to modify
leafno	Number that identifies the leaf to encode
threshold	Threshold to use when encoding value of the leaf

References bio_write(), opj_tgt_node::known, opj_tgt_node::low, opj_tgt_tree::nodes, opj_tgt_node::parent, and opj_tgt_node::value.

Referenced by t2_encode_packet().

tgt_reset()

void tgt_reset

(

opj_tgt_tree_t *

tree

)

Reset a tag-tree (set all leaves to 0).

Parameters

tree	Tag-tree to reset

References opj_tgt_node::known, opj_tgt_node::low, opj_tgt_tree::nodes, opj_tgt_tree::numnodes, and opj_tgt_node::value.

Referenced by t2_decode_packet(), t2_encode_packet(), and tgt_create().

tgt_setvalue()

void tgt_setvalue	(	opj_tgt_tree_t *	tree,
		int	leafno,
		int	value )

Set the value of a leaf of a tag-tree.

Parameters

tree	Tag-tree to modify
leafno	Number that identifies the leaf to modify
value	New value of the leaf

References opj_tgt_tree::nodes, opj_tgt_node::parent, and opj_tgt_node::value.

Referenced by t2_encode_packet().