openjpeg/libopenjpeg/dwt.c

/*
 * Copyright (c) 2001-2002, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2002-2003,  Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
 * 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 "dwt.h"
#include "int.h"
#include "fix.h"
#include "tcd.h"
#include <stdlib.h>
#include <stdio.h>

#define S(i) a[x*(i)*2]
#define D(i) a[x*(1+(i)*2)]
#define S_(i) ((i)<0?S(0):((i)>=sn?S(sn-1):S(i)))
#define D_(i) ((i)<0?D(0):((i)>=dn?D(dn-1):D(i)))
/* new */
#define SS_(i) ((i)<0?S(0):((i)>=dn?S(dn-1):S(i)))
#define DD_(i) ((i)<0?D(0):((i)>=sn?D(sn-1):D(i)))

/* <summary> */
/* This table contains the norms of the 5-3 wavelets for different bands.  */
/* </summary> */
double dwt_norms[4][10] = {
	{1.000, 1.500, 2.750, 5.375, 10.68, 21.34, 42.67, 85.33, 170.7, 341.3},
	{1.038, 1.592, 2.919, 5.703, 11.33, 22.64, 45.25, 90.48, 180.9},
	{1.038, 1.592, 2.919, 5.703, 11.33, 22.64, 45.25, 90.48, 180.9},
	{.7186, .9218, 1.586, 3.043, 6.019, 12.01, 24.00, 47.97, 95.93}
};

/* <summary> */
/* This table contains the norms of the 9-7 wavelets for different bands.  */
/* </summary> */
double dwt_norms_real[4][10] = {
	{1.000, 1.965, 4.177, 8.403, 16.90, 33.84, 67.69, 135.3, 270.6, 540.9},
	{2.022, 3.989, 8.355, 17.04, 34.27, 68.63, 137.3, 274.6, 549.0},
	{2.022, 3.989, 8.355, 17.04, 34.27, 68.63, 137.3, 274.6, 549.0},
	{2.080, 3.865, 8.307, 17.18, 34.71, 69.59, 139.3, 278.6, 557.2}
};

/* Add Patrick */
static int *b = NULL;
static int lastSizeOfB = 0;


void dwt_clean()
{
	if (b != NULL) {
		free(b);
	}
	b = NULL;
	lastSizeOfB = 0;
}

/* \ Add Patrick */

/* <summary> */
/* Forward lazy transform. */
/* </summary> */
void dwt_deinterleave(int *a, int n, int x, int res, int cas)
{
	int dn, sn, i;
	sn = res;
	dn = n - res;
	if (lastSizeOfB != n) {
		if (b != NULL)
			free(b);
		b = (int *) malloc(n * sizeof(int));
		lastSizeOfB = n;
	}

	if (cas) {
		for (i = 0; i < sn; i++)
			b[i] = a[(2 * i + 1) * x];
		for (i = 0; i < dn; i++)
			b[sn + i] = a[2 * i * x];
	} else {
		for (i = 0; i < sn; i++)
			b[i] = a[2 * i * x];
		for (i = 0; i < dn; i++)
			b[sn + i] = a[(2 * i + 1) * x];
	}
	for (i = 0; i < n; i++)
		a[i * x] = b[i];
}

/* <summary> */
/* Forward lazy transform. */
/* </summary> */
void dwt_deinterleave_real(int *a, int n, int x, int res, int cas)
{
	int dn, sn, i;
	sn = res;
	dn = n - res;

	if (lastSizeOfB != n) {
		if (b != NULL)
			free(b);
		b = (int *) malloc(n * sizeof(int));
		lastSizeOfB = n;
	}

	if (cas) {
		for (i = 0; i < sn; i++)
			b[i] = a[(2 * i + 1) * x];
		for (i = 0; i < dn; i++)
			b[sn + i] = a[2 * i * x];
	} else {
		for (i = 0; i < sn; i++)
			b[i] = a[2 * i * x];
		for (i = 0; i < dn; i++)
			b[sn + i] = a[(2 * i + 1) * x];
	}
	for (i = 0; i < n; i++)
		a[i * x] = b[i];

}

/* <summary> */
/* Inverse lazy transform. */
/* </summary> */
void dwt_interleave(int *a, int n, int x, int res, int cas)
{
	int dn, sn, i;
	sn = res;
	dn = n - res;

	if (lastSizeOfB != n) {
		if (b != NULL)
			free(b);
		b = (int *) malloc(n * sizeof(int));
		lastSizeOfB = n;
	}

	if (cas) {
		for (i = 0; i < sn; i++)
			b[2 * i + 1] = a[i * x];
		for (i = 0; i < dn; i++)
			b[2 * i] = a[(sn + i) * x];
	} else {
		for (i = 0; i < sn; i++)
			b[2 * i] = a[i * x];
		for (i = 0; i < dn; i++)
			b[2 * i + 1] = a[(sn + i) * x];
	}
	for (i = 0; i < n; i++)
		a[i * x] = b[i];
}

/* <summary> */
/* Inverse lazy transform. */
/* </summary> */
void dwt_interleave_real(int *a, int n, int x, int res, int cas)
{
	int dn, sn, i;
	sn = res;
	dn = n - res;

	if (lastSizeOfB != n) {
		if (b != NULL)
			free(b);
		b = (int *) malloc(n * sizeof(int));
		lastSizeOfB = n;
	}

	if (cas) {
		for (i = 0; i < sn; i++)
			b[2 * i + 1] = a[i * x];
		for (i = 0; i < dn; i++)
			b[2 * i] = a[(sn + i) * x];
	} else {
		for (i = 0; i < sn; i++)
			b[2 * i] = a[i * x];
		for (i = 0; i < dn; i++)
			b[2 * i + 1] = a[(sn + i) * x];
	}
	for (i = 0; i < n; i++)
		a[i * x] = b[i];

}

/* <summary> */
/* Forward 5-3 wavelet tranform in 1-D. */
/* </summary> */
void dwt_encode_1(int *a, int n, int x, int res, int cas)
{
	int dn, sn, i = 0;
	sn = res;
	dn = n - res;

	if (cas) {
		if (!sn && dn == 1)					/* NEW :  CASE ONE ELEMENT */
			S(i) *= 2;
		else {
			for (i = 0; i < dn; i++)
				S(i) -= (DD_(i) + DD_(i - 1)) >> 1;
			for (i = 0; i < sn; i++)
				D(i) += (SS_(i) + SS_(i + 1) + 2) >> 2;
		}
	} else {
		if ((dn > 0) || (sn > 1)) {  /* NEW :  CASE ONE ELEMENT */
			for (i = 0; i < dn; i++)
				D(i) -= (S_(i) + S_(i + 1)) >> 1;
			for (i = 0; i < sn; i++)
				S(i) += (D_(i - 1) + D_(i) + 2) >> 2;
		}
	}
	dwt_deinterleave(a, n, x, res, cas);
}

/* <summary> */
/* Inverse 5-3 wavelet tranform in 1-D. */
/* </summary> */
void dwt_decode_1(int *a, int n, int x, int res, int cas)
{
	int dn, sn, i = 0;
	/* dn=n/2; */
	/* sn=(n+1)/2; */
	sn = res;
	dn = n - res;

	dwt_interleave(a, n, x, res, cas);
	if (cas) {
		if (!sn && dn == 1)					/* NEW :  CASE ONE ELEMENT */
			S(i) /= 2;
		else {
			for (i = 0; i < sn; i++)
				D(i) -= (SS_(i) + SS_(i + 1) + 2) >> 2;
			for (i = 0; i < dn; i++)
				S(i) += (DD_(i) + DD_(i - 1)) >> 1;
		}
	} else {
		if ((dn > 0) || (sn > 1)) { /* NEW :  CASE ONE ELEMENT */
			for (i = 0; i < sn; i++)
				S(i) -= (D_(i - 1) + D_(i) + 2) >> 2;
			for (i = 0; i < dn; i++)
				D(i) += (S_(i) + S_(i + 1)) >> 1;
		}
	}
}

/* <summary> */
/* Forward 5-3 wavelet tranform in 2-D. */
/* </summary> */
void dwt_encode(int *a, int w, int h, tcd_tilecomp_t * tilec, int l)
{
	int i, j, rw, rh, rw1, rh1;
	int previous_rw, previous_rh, previous_rw1, previous_rh1;

	for (i = 0; i < l; i++) {
		int cas_col = 0;
		int cas_row = 0;
		rw = tilec->resolutions[l - i].x1 - tilec->resolutions[l - i].x0;
		rh = tilec->resolutions[l - i].y1 - tilec->resolutions[l - i].y0;
		rw1 =
			tilec->resolutions[l - i - 1].x1 - tilec->resolutions[l - i - 1].x0;
		rh1 =
			tilec->resolutions[l - i - 1].y1 - tilec->resolutions[l - i - 1].y0;

		/* Check the different cases for that it's necessary to invert high pass and low pass filter */

		if (tilec->previous_row) {
			previous_rw =
				tilec->resolutions[l - i].previous_x1 - tilec->resolutions[l -
																																	 i].
				previous_x0;
			previous_rw1 =
				tilec->resolutions[l - i - 1].previous_x1 - tilec->resolutions[l -
																																			 i -
																																			 1].
				previous_x0;
			/* inversion on the previous and propagation of the inversion on the other tile */
			if ((previous_rw1 > previous_rw - previous_rw1 && rw1 == rw - rw1)
					|| (tilec->resolutions[l - i - 1].cas_row
							&& previous_rw1 == previous_rw - previous_rw1))
				cas_row = 1;
		}

		if (tilec->previous_col) {
			previous_rh =
				tilec->resolutions[l - i].previous_y1 - tilec->resolutions[l -
																																	 i].
				previous_y0;
			previous_rh1 =
				tilec->resolutions[l - i - 1].previous_y1 - tilec->resolutions[l -
																																			 i -
																																			 1].
				previous_y0;
			/* inversion on the previous and propagation of the inversion on the other tile */
			if ((previous_rh1 > previous_rh - previous_rh1 && rh1 == rh - rh1)
					|| (tilec->resolutions[l - i - 1].cas_col
							&& previous_rh1 == previous_rh - previous_rh1))
				cas_col = 1;
		}

		/* subband LL shorter than LH or HL */
		if (rw1 < rw - rw1)
			cas_row = 1;
		if (rh1 < rh - rh1)
			cas_col = 1;

		/* OFFSET IMAGE (If origin of the resolution is odd and first tile on the row or column) */
		if (!tilec->previous_row && ((tilec->resolutions[l - i].x0 % 2) == 1))
			cas_row = 1;
		if (!tilec->previous_col && ((tilec->resolutions[l - i].y0 % 2) == 1))
			cas_col = 1;

		tilec->resolutions[l - i - 1].cas_row = cas_row;
		tilec->resolutions[l - i - 1].cas_col = cas_col;

		for (j = 0; j < rw; j++)
			dwt_encode_1(a + j, rh, w, rh1, cas_col);
		for (j = 0; j < rh; j++)
			dwt_encode_1(a + j * w, rw, 1, rw1, cas_row);
	}

	dwt_clean();
}

/* <summary> */
/* Inverse 5-3 wavelet tranform in 2-D. */
/* </summary> */
void dwt_decode(int *a, int w, int h, tcd_tilecomp_t * tilec, int l,
								tcd_tilecomp_t * row_tilec, tcd_tilecomp_t * col_tilec)
{
	int i, j, rw, rh, rw1, rh1;
	int previous_rw, previous_rh, previous_rw1, previous_rh1;
	for (i = l - 1; i >= 0; i--) {
		int cas_col = 0;
		int cas_row = 0;

		rw = tilec->resolutions[l - i].x1 - tilec->resolutions[l - i].x0;
		rh = tilec->resolutions[l - i].y1 - tilec->resolutions[l - i].y0;
		rw1 =
			tilec->resolutions[l - i - 1].x1 - tilec->resolutions[l - i - 1].x0;
		rh1 =
			tilec->resolutions[l - i - 1].y1 - tilec->resolutions[l - i - 1].y0;

		if (tilec->previous_row) {
			previous_rw =
				tilec->resolutions[l - i].previous_x1 - tilec->resolutions[l -
																																	 i].
				previous_x0;
			previous_rw1 =
				tilec->resolutions[l - i - 1].previous_x1 - tilec->resolutions[l -
																																			 i -
																																			 1].
				previous_x0;
			if ((previous_rw1 > previous_rw - previous_rw1 && rw1 == rw - rw1)
					|| (row_tilec->resolutions[l - i - 1].cas_row
							&& previous_rw1 == previous_rw - previous_rw1))
				cas_row = 1;
		}

		if (tilec->previous_col) {
			previous_rh =
				tilec->resolutions[l - i].previous_y1 - tilec->resolutions[l -
																																	 i].
				previous_y0;
			previous_rh1 =
				tilec->resolutions[l - i - 1].previous_y1 - tilec->resolutions[l -
																																			 i -
																																			 1].
				previous_y0;
			if ((previous_rh1 > previous_rh - previous_rh1 && rh1 == rh - rh1)
					|| (col_tilec->resolutions[l - i - 1].cas_col
							&& previous_rh1 == previous_rh - previous_rh1))
				cas_col = 1;
		}

		if (rw1 < rw - rw1)
			cas_row = 1;
		if (rh1 < rh - rh1)
			cas_col = 1;

		/* OFFSET IMAGE (If origin of the resolution is odd and first tile on the row or column) */
		if (!tilec->previous_row && ((tilec->resolutions[l - i].x0 % 2) == 1))
			cas_row = 1;
		if (!tilec->previous_col && ((tilec->resolutions[l - i].y0 % 2) == 1))
			cas_col = 1;

		tilec->resolutions[l - i - 1].cas_row = cas_row;
		tilec->resolutions[l - i - 1].cas_col = cas_col;

		for (j = 0; j < rh; j++)
			dwt_decode_1(a + j * w, rw, 1, rw1, cas_row);
		for (j = 0; j < rw; j++)
			dwt_decode_1(a + j, rh, w, rh1, cas_col);
	}
	dwt_clean();
}

/* <summary> */
/* Get gain of 5-3 wavelet transform. */
/* </summary> */
int dwt_getgain(int orient)
{
	if (orient == 0)
		return 0;
	if (orient == 1 || orient == 2)
		return 1;
	return 2;
}

/* <summary> */
/* Get norm of 5-3 wavelet. */
/* </summary> */
double dwt_getnorm(int level, int orient)
{
	return dwt_norms[orient][level];
}

/* <summary> */
/* Forward 9-7 wavelet transform in 1-D. */
/* </summary> */
void dwt_encode_1_real(int *a, int n, int x, int res, int cas)
{
	int dn, sn, i = 0;
	dn = n - res;
	sn = res;

	if (cas) {
		if ((sn > 0) || (dn > 1)) {  /* NEW :  CASE ONE ELEMENT */
			for (i = 0; i < dn; i++)
				S(i) -= fix_mul(DD_(i) + DD_(i - 1), 12993);
			for (i = 0; i < sn; i++)
				D(i) -= fix_mul(SS_(i) + SS_(i + 1), 434);
			for (i = 0; i < dn; i++)
				S(i) += fix_mul(DD_(i) + DD_(i - 1), 7233);
			for (i = 0; i < sn; i++)
				D(i) += fix_mul(SS_(i) + SS_(i + 1), 3633);
			for (i = 0; i < dn; i++)
				S(i) = fix_mul(S(i), 5038);
			for (i = 0; i < sn; i++)
				D(i) = fix_mul(D(i), 6660);
		}
	} else {
	  if ((dn > 0) || (sn > 1)) {  /* NEW :  CASE ONE ELEMENT */
			for (i = 0; i < dn; i++)
				D(i) -= fix_mul(S_(i) + S_(i + 1), 12993);
			for (i = 0; i < sn; i++)
				S(i) -= fix_mul(D_(i - 1) + D_(i), 434);
			for (i = 0; i < dn; i++)
				D(i) += fix_mul(S_(i) + S_(i + 1), 7233);
			for (i = 0; i < sn; i++)
				S(i) += fix_mul(D_(i - 1) + D_(i), 3633);
			for (i = 0; i < dn; i++)
				D(i) = fix_mul(D(i), 5038);
			for (i = 0; i < sn; i++)
				S(i) = fix_mul(S(i), 6660);
		}
	}
	dwt_deinterleave_real(a, n, x, res, cas);
}

/* <summary> */
/* Inverse 9-7 wavelet transform in 1-D. */
/* </summary> */
void dwt_decode_1_real(int *a, int n, int x, int res, int cas)
{
	int dn, sn, i = 0;
	dn = n - res;
	sn = res;
	dwt_interleave_real(a, n, x, res, cas);
	if (cas) {
		if ((sn > 0) || (dn > 1)) {  /* NEW :  CASE ONE ELEMENT */
			for (i = 0; i < sn; i++)
				D(i) = fix_mul(D(i), 10076);
			for (i = 0; i < dn; i++)
				S(i) = fix_mul(S(i), 13320);
			for (i = 0; i < sn; i++)
				D(i) -= fix_mul(SS_(i) + SS_(i + 1), 3633);
			for (i = 0; i < dn; i++)
				S(i) -= fix_mul(DD_(i) + DD_(i - 1), 7233);
			for (i = 0; i < sn; i++)
				D(i) += fix_mul(SS_(i) + SS_(i + 1), 434);
			for (i = 0; i < dn; i++)
				S(i) += fix_mul(DD_(i) + DD_(i - 1), 12993);
		}
	} else {
		if ((dn > 0) || (sn > 1)) {  /* NEW :  CASE ONE ELEMENT */
			for (i = 0; i < sn; i++)
				S(i) = fix_mul(S(i), 10076);
			for (i = 0; i < dn; i++)
				D(i) = fix_mul(D(i), 13320);
			for (i = 0; i < sn; i++)
				S(i) -= fix_mul(D_(i - 1) + D_(i), 3633);
			for (i = 0; i < dn; i++)
				D(i) -= fix_mul(S_(i) + S_(i + 1), 7233);
			for (i = 0; i < sn; i++)
				S(i) += fix_mul(D_(i - 1) + D_(i), 434);
			for (i = 0; i < dn; i++)
				D(i) += fix_mul(S_(i) + S_(i + 1), 12993);
		}
	}
}

/* <summary> */
/* Forward 9-7 wavelet transform in 2-D. */
/* </summary> */

void dwt_encode_real(int *a, int w, int h, tcd_tilecomp_t * tilec, int l)
{
	int i, j, rw, rh, rw1, rh1;
	int previous_rw, previous_rh, previous_rw1, previous_rh1;

	for (i = 0; i < l; i++) {
		int cas_col = 0;
		int cas_row = 0;
		rw = tilec->resolutions[l - i].x1 - tilec->resolutions[l - i].x0;
		rh = tilec->resolutions[l - i].y1 - tilec->resolutions[l - i].y0;
		rw1 =
			tilec->resolutions[l - i - 1].x1 - tilec->resolutions[l - i - 1].x0;
		rh1 =
			tilec->resolutions[l - i - 1].y1 - tilec->resolutions[l - i - 1].y0;

		if (tilec->previous_row) {
			previous_rw =
				tilec->resolutions[l - i].previous_x1 - tilec->resolutions[l -
																																	 i].
				previous_x0;
			previous_rw1 =
				tilec->resolutions[l - i - 1].previous_x1 - tilec->resolutions[l -
																																			 i -
																																			 1].
				previous_x0;
			if ((previous_rw1 > previous_rw - previous_rw1 && rw1 == rw - rw1)
					|| (tilec->resolutions[l - i - 1].cas_row
							&& previous_rw1 == previous_rw - previous_rw1))
				cas_row = 1;
		}

		if (tilec->previous_col) {
			previous_rh =
				tilec->resolutions[l - i].previous_y1 - tilec->resolutions[l -
																																	 i].
				previous_y0;
			previous_rh1 =
				tilec->resolutions[l - i - 1].previous_y1 - tilec->resolutions[l -
																																			 i -
																																			 1].
				previous_y0;
			if ((previous_rh1 > previous_rh - previous_rh1 && rh1 == rh - rh1)
					|| (tilec->resolutions[l - i - 1].cas_col
							&& previous_rh1 == previous_rh - previous_rh1))
				cas_col = 1;
		}

		if (rw1 < rw - rw1)
			cas_row = 1;
		if (rh1 < rh - rh1)
			cas_col = 1;

		/* OFFSET IMAGE (If origin of the resolution is odd and first tile on the row or column) */
		if (!tilec->previous_row && ((tilec->resolutions[l - i].x0 % 2) == 1))
			cas_row = 1;
		if (!tilec->previous_col && ((tilec->resolutions[l - i].y0 % 2) == 1))
			cas_col = 1;

		tilec->resolutions[l - i - 1].cas_row = cas_row;
		tilec->resolutions[l - i - 1].cas_col = cas_col;

		for (j = 0; j < rw; j++)
			dwt_encode_1_real(a + j, rh, w, rh1, cas_col);
		for (j = 0; j < rh; j++)
			dwt_encode_1_real(a + j * w, rw, 1, rw1, cas_row);
	}
}

/* <summary> */
/* Inverse 9-7 wavelet transform in 2-D. */
/* </summary> */
void dwt_decode_real(int *a, int w, int h, tcd_tilecomp_t * tilec, int l,
										 tcd_tilecomp_t * row_tilec,
										 tcd_tilecomp_t * col_tilec)
{
	int i, j, rw, rh, rw1, rh1;
	int previous_rw, previous_rh, previous_rw1, previous_rh1;

	for (i = l - 1; i >= 0; i--) {
		int cas_col = 0;
		int cas_row = 0;

		rw = tilec->resolutions[l - i].x1 - tilec->resolutions[l - i].x0;
		rh = tilec->resolutions[l - i].y1 - tilec->resolutions[l - i].y0;
		rw1 =
			tilec->resolutions[l - i - 1].x1 - tilec->resolutions[l - i - 1].x0;
		rh1 =
			tilec->resolutions[l - i - 1].y1 - tilec->resolutions[l - i - 1].y0;

		if (tilec->previous_row) {
			previous_rw =
				tilec->resolutions[l - i].previous_x1 - tilec->resolutions[l -
																																	 i].
				previous_x0;
			previous_rw1 =
				tilec->resolutions[l - i - 1].previous_x1 - tilec->resolutions[l -
																																			 i -
																																			 1].
				previous_x0;
			if ((previous_rw1 > previous_rw - previous_rw1 && rw1 == rw - rw1)
					|| (row_tilec->resolutions[l - i - 1].cas_row
							&& previous_rw1 == previous_rw - previous_rw1))
				cas_row = 1;
		}

		if (tilec->previous_col) {
			previous_rh =
				tilec->resolutions[l - i].previous_y1 - tilec->resolutions[l -
																																	 i].
				previous_y0;
			previous_rh1 =
				tilec->resolutions[l - i - 1].previous_y1 - tilec->resolutions[l -
																																			 i -
																																			 1].
				previous_y0;
			if ((previous_rh1 > previous_rh - previous_rh1 && rh1 == rh - rh1)
					|| (col_tilec->resolutions[l - i - 1].cas_col
							&& previous_rh1 == previous_rh - previous_rh1))
				cas_col = 1;
		}

		if (rw1 < rw - rw1)
			cas_row = 1;
		if (rh1 < rh - rh1)
			cas_col = 1;

		/* OFFSET IMAGE (If origin of the resolution is odd and first tile on the row or column) */
		if (!tilec->previous_row && ((tilec->resolutions[l - i].x0 % 2) == 1))
			cas_row = 1;
		if (!tilec->previous_col && ((tilec->resolutions[l - i].y0 % 2) == 1))
			cas_col = 1;

		tilec->resolutions[l - i - 1].cas_row = cas_row;
		tilec->resolutions[l - i - 1].cas_col = cas_col;

		for (j = 0; j < rh; j++)
			dwt_decode_1_real(a + j * w, rw, 1, rw1, cas_row);
		for (j = 0; j < rw; j++)
			dwt_decode_1_real(a + j, rh, w, rh1, cas_col);
	}
}

/* <summary> */
/* Get gain of 9-7 wavelet transform. */
/* </summary> */
int dwt_getgain_real(int orient)
{
	return 0;
}

/* <summary> */
/* Get norm of 9-7 wavelet. */
/* </summary> */
double dwt_getnorm_real(int level, int orient)
{
	return dwt_norms_real[orient][level];
}