jpc_tsfb.c

JPEG2000是以小波变换为基础

/*
 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2004 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer License Version 2.0
 * 
 * Copyright (c) 2001-2006 Michael David Adams
 * Copyright (c) 1999-2000 Image Power, Inc.
 * Copyright (c) 1999-2000 The University of British Columbia
 * 
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/*
 * Tree-Structured Filter Bank (TSFB) Library
 *
 * $Id$
 */

/******************************************************************************\
* Includes.
\******************************************************************************/

#include <assert.h>

#include "jasper/jas_malloc.h"
#include "jasper/jas_seq.h"

#include "jpc_tsfb.h"
#include "jpc_cod.h"
#include "jpc_cs.h"
#include "jpc_util.h"
#include "jpc_math.h"

void jpc_tsfb_getbands2(jpc_tsfb_t *tsfb, int locxstart, int locystart,
  int xstart, int ystart, int xend, int yend, jpc_tsfb_band_t **bands,
  int numlvls);

/******************************************************************************\
*
\******************************************************************************/

jpc_tsfb_t *jpc_cod_gettsfb(int qmfbid, int numlvls)
{
	jpc_tsfb_t *tsfb;

	if (!(tsfb = malloc(sizeof(jpc_tsfb_t))))
		return 0;

	if (numlvls > 0) {
		switch (qmfbid) {
		case JPC_COX_INS:
			tsfb->qmfb = &jpc_ns_qmfb2d;
			break;
		default:
		case JPC_COX_RFT:
			tsfb->qmfb = &jpc_ft_qmfb2d;
			break;
		}
	} else {
		tsfb->qmfb = 0;
	}
	tsfb->numlvls = numlvls;
	return tsfb;
}

void jpc_tsfb_destroy(jpc_tsfb_t *tsfb)
{
	free(tsfb);
}

int jpc_tsfb_analyze(jpc_tsfb_t *tsfb, jas_seq2d_t *a)
{
	return (tsfb->numlvls > 0) ? jpc_tsfb_analyze2(tsfb, jas_seq2d_getref(a,
	  jas_seq2d_xstart(a), jas_seq2d_ystart(a)), jas_seq2d_xstart(a),
	  jas_seq2d_ystart(a), jas_seq2d_width(a),
	  jas_seq2d_height(a), jas_seq2d_rowstep(a), tsfb->numlvls - 1) : 0;
}

int jpc_tsfb_analyze2(jpc_tsfb_t *tsfb, int *a, int xstart, int ystart,
  int width, int height, int stride, int numlvls)
{
	if (width > 0 && height > 0) {
		if ((*tsfb->qmfb->analyze)(a, xstart, ystart, width, height, stride))
			return -1;
		if (numlvls > 0) {
			if (jpc_tsfb_analyze2(tsfb, a, JPC_CEILDIVPOW2(xstart,
			  1), JPC_CEILDIVPOW2(ystart, 1), JPC_CEILDIVPOW2(
			  xstart + width, 1) - JPC_CEILDIVPOW2(xstart, 1),
			  JPC_CEILDIVPOW2(ystart + height, 1) -
			  JPC_CEILDIVPOW2(ystart, 1), stride, numlvls - 1)) {
				return -1;
			}
		}
	}
	return 0;
}

int jpc_tsfb_synthesize(jpc_tsfb_t *tsfb, jas_seq2d_t *a)
{
	return (tsfb->numlvls > 0) ? jpc_tsfb_synthesize2(tsfb,
	  jas_seq2d_getref(a, jas_seq2d_xstart(a), jas_seq2d_ystart(a)),
	  jas_seq2d_xstart(a), jas_seq2d_ystart(a), jas_seq2d_width(a),
	  jas_seq2d_height(a), jas_seq2d_rowstep(a), tsfb->numlvls - 1) : 0;
}

int jpc_tsfb_synthesize2(jpc_tsfb_t *tsfb, int *a, int xstart, int ystart,
  int width, int height, int stride, int numlvls)
{
	if (numlvls > 0) {
		if (jpc_tsfb_synthesize2(tsfb, a, JPC_CEILDIVPOW2(xstart, 1),
		  JPC_CEILDIVPOW2(ystart, 1), JPC_CEILDIVPOW2(xstart + width,
		  1) - JPC_CEILDIVPOW2(xstart, 1), JPC_CEILDIVPOW2(ystart +
		  height, 1) - JPC_CEILDIVPOW2(ystart, 1), stride, numlvls -
		  1)) {
			return -1;
		}
	}
	if (width > 0 && height > 0) {
		if ((*tsfb->qmfb->synthesize)(a, xstart, ystart, width, height, stride)) {
			return -1;
		}
	}
	return 0;
}

int jpc_tsfb_getbands(jpc_tsfb_t *tsfb, uint_fast32_t xstart,
  uint_fast32_t ystart, uint_fast32_t xend, uint_fast32_t yend,
  jpc_tsfb_band_t *bands)
{
	jpc_tsfb_band_t *band;

	band = bands;
	if (tsfb->numlvls > 0) {
		jpc_tsfb_getbands2(tsfb, xstart, ystart, xstart, ystart, xend, yend,
		  &band, tsfb->numlvls);
	} else {

		band->xstart = xstart;
		band->ystart = ystart;
		band->xend = xend;
		band->yend = yend;
		band->locxstart = xstart;
		band->locystart = ystart;
		band->locxend = band->locxstart + band->xend - band->xstart;
		band->locyend = band->locystart + band->yend - band->ystart;
		band->orient = JPC_TSFB_LL;
		band->synenergywt = JPC_FIX_ONE;
		++band;
	}
	return band - bands;
}

void jpc_tsfb_getbands2(jpc_tsfb_t *tsfb, int locxstart, int locystart,
  int xstart, int ystart, int xend, int yend, jpc_tsfb_band_t **bands,
  int numlvls)
{
	int newxstart;
	int newystart;
	int newxend;
	int newyend;
	jpc_tsfb_band_t *band;

	newxstart = JPC_CEILDIVPOW2(xstart, 1);
	newystart = JPC_CEILDIVPOW2(ystart, 1);
	newxend = JPC_CEILDIVPOW2(xend, 1);
	newyend = JPC_CEILDIVPOW2(yend, 1);

	if (numlvls > 0) {

		jpc_tsfb_getbands2(tsfb, locxstart, locystart, newxstart, newystart,
		  newxend, newyend, bands, numlvls - 1);

		band = *bands;
		band->xstart = JPC_FLOORDIVPOW2(xstart, 1);
		band->ystart = newystart;
		band->xend = JPC_FLOORDIVPOW2(xend, 1);
		band->yend = newyend;
		band->locxstart = locxstart + newxend - newxstart;
		band->locystart = locystart;
		band->locxend = band->locxstart + band->xend - band->xstart;
		band->locyend = band->locystart + band->yend - band->ystart;
		band->orient = JPC_TSFB_HL;
		band->synenergywt = jpc_dbltofix(tsfb->qmfb->hpenergywts[
		  tsfb->numlvls - numlvls] * tsfb->qmfb->lpenergywts[
		  tsfb->numlvls - numlvls]);
		++(*bands);

		band = *bands;
		band->xstart = newxstart;
		band->ystart = JPC_FLOORDIVPOW2(ystart, 1);
		band->xend = newxend;
		band->yend = JPC_FLOORDIVPOW2(yend, 1);
		band->locxstart = locxstart;
		band->locystart = locystart + newyend - newystart;
		band->locxend = band->locxstart + band->xend - band->xstart;
		band->locyend = band->locystart + band->yend - band->ystart;
		band->orient = JPC_TSFB_LH;
		band->synenergywt = jpc_dbltofix(tsfb->qmfb->lpenergywts[
		  tsfb->numlvls - numlvls] * tsfb->qmfb->hpenergywts[
		  tsfb->numlvls - numlvls]);
		++(*bands);

		band = *bands;
		band->xstart = JPC_FLOORDIVPOW2(xstart, 1);
		band->ystart = JPC_FLOORDIVPOW2(ystart, 1);
		band->xend = JPC_FLOORDIVPOW2(xend, 1);
		band->yend = JPC_FLOORDIVPOW2(yend, 1);
		band->locxstart = locxstart + newxend - newxstart;
		band->locystart = locystart + newyend - newystart;
		band->locxend = band->locxstart + band->xend - band->xstart;
		band->locyend = band->locystart + band->yend - band->ystart;
		band->orient = JPC_TSFB_HH;
		band->synenergywt = jpc_dbltofix(tsfb->qmfb->hpenergywts[
		  tsfb->numlvls - numlvls] * tsfb->qmfb->hpenergywts[
		  tsfb->numlvls - numlvls]);
		++(*bands);

	} else {

		band = *bands;
		band->xstart = xstart;
		band->ystart = ystart;
		band->xend = xend;
		band->yend = yend;
		band->locxstart = locxstart;
		band->locystart = locystart;
		band->locxend = band->locxstart + band->xend - band->xstart;
		band->locyend = band->locystart + band->yend - band->ystart;
		band->orient = JPC_TSFB_LL;
		band->synenergywt = jpc_dbltofix(tsfb->qmfb->lpenergywts[
		  tsfb->numlvls - numlvls - 1] * tsfb->qmfb->lpenergywts[
		  tsfb->numlvls - numlvls - 1]);
		++(*bands);

	}

}