libavcodec/dirac

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This source file includes following definitions.
vertical_compose53iL0
interleave
horizontal_compose_dirac53i
horizontal_compose_dd97i
horizontal_compose_dd137i
horizontal_compose_haari
horizontal_compose_haar0i
horizontal_compose_haar1i
horizontal_compose_fidelityi
horizontal_compose_daub97i
vertical_compose_dirac53iH0
vertical_compose_dd97iH0
vertical_compose_dd137iL0
vertical_compose_haar
vertical_compose_fidelityiH0
vertical_compose_fidelityiL0
vertical_compose_daub97iH0
vertical_compose_daub97iH1
vertical_compose_daub97iL0
vertical_compose_daub97iL1
spatial_compose_dd97i_dy
spatial_compose_dirac53i_dy
spatial_compose_dd137i_dy
spatial_compose_haari_dy
spatial_compose_fidelity
spatial_compose_daub97i_dy
spatial_compose97i_init2
spatial_compose53i_init2
spatial_compose_dd97i_init
spatial_compose_dd137i_init
ff_spatial_idwt_init2
ff_spatial_idwt_slice2
/*
 * Copyright (C) 2004-2010 Michael Niedermayer <michaelni@gmx.at>
 * Copyright (C) 2008 David Conrad
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/common.h"
#include "dirac_dwt.h"
#include "libavcodec/x86/dirac_dwt.h"


static void vertical_compose53iL0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                  int width)
{
    int i;

    for (i = 0; i < width; i++)
        b1[i] -= (b0[i] + b2[i] + 2) >> 2;
}


static av_always_inline
void interleave(IDWTELEM *dst, IDWTELEM *src0, IDWTELEM *src1, int w2, int add, int shift)
{
    int i;
    for (i = 0; i < w2; i++) {
        dst[2*i  ] = (src0[i] + add) >> shift;
        dst[2*i+1] = (src1[i] + add) >> shift;
    }
}

static void horizontal_compose_dirac53i(IDWTELEM *b, IDWTELEM *temp, int w)
{
    const int w2 = w >> 1;
    int x;

    temp[0] = COMPOSE_53iL0(b[w2], b[0], b[w2]);
    for (x = 1; x < w2; x++) {
        temp[x     ] = COMPOSE_53iL0     (b[x+w2-1], b[x     ], b[x+w2]);
        temp[x+w2-1] = COMPOSE_DIRAC53iH0(temp[x-1], b[x+w2-1], temp[x]);
    }
    temp[w-1] = COMPOSE_DIRAC53iH0(temp[w2-1], b[w-1], temp[w2-1]);

    interleave(b, temp, temp+w2, w2, 1, 1);
}

static void horizontal_compose_dd97i(IDWTELEM *b, IDWTELEM *tmp, int w)
{
    const int w2 = w >> 1;
    int x;

    tmp[0] = COMPOSE_53iL0(b[w2], b[0], b[w2]);
    for (x = 1; x < w2; x++)
        tmp[x] = COMPOSE_53iL0(b[x+w2-1], b[x], b[x+w2]);

    // extend the edges
    tmp[-1]   = tmp[0];
    tmp[w2+1] = tmp[w2] = tmp[w2-1];

    for (x = 0; x < w2; x++) {
        b[2*x  ] = (tmp[x] + 1)>>1;
        b[2*x+1] = (COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1)>>1;
    }
}

static void horizontal_compose_dd137i(IDWTELEM *b, IDWTELEM *tmp, int w)
{
    const int w2 = w >> 1;
    int x;

    tmp[0] = COMPOSE_DD137iL0(b[w2], b[w2], b[0], b[w2  ], b[w2+1]);
    tmp[1] = COMPOSE_DD137iL0(b[w2], b[w2], b[1], b[w2+1], b[w2+2]);
    for (x = 2; x < w2-1; x++)
        tmp[x] = COMPOSE_DD137iL0(b[x+w2-2], b[x+w2-1], b[x], b[x+w2], b[x+w2+1]);
    tmp[w2-1] = COMPOSE_DD137iL0(b[w-3], b[w-2], b[w2-1], b[w-1], b[w-1]);

    // extend the edges
    tmp[-1]   = tmp[0];
    tmp[w2+1] = tmp[w2] = tmp[w2-1];

    for (x = 0; x < w2; x++) {
        b[2*x  ] = (tmp[x] + 1)>>1;
        b[2*x+1] = (COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1)>>1;
    }
}

static av_always_inline
void horizontal_compose_haari(IDWTELEM *b, IDWTELEM *temp, int w, int shift)
{
    const int w2 = w >> 1;
    int x;

    for (x = 0; x < w2; x++) {
        temp[x   ] = COMPOSE_HAARiL0(b[x   ], b[x+w2]);
        temp[x+w2] = COMPOSE_HAARiH0(b[x+w2], temp[x]);
    }

    interleave(b, temp, temp+w2, w2, shift, shift);
}

static void horizontal_compose_haar0i(IDWTELEM *b, IDWTELEM *temp, int w)
{
    horizontal_compose_haari(b, temp, w, 0);
}

static void horizontal_compose_haar1i(IDWTELEM *b, IDWTELEM *temp, int w)
{
    horizontal_compose_haari(b, temp, w, 1);
}

static void horizontal_compose_fidelityi(IDWTELEM *b, IDWTELEM *tmp, int w)
{
    const int w2 = w >> 1;
    int i, x;
    IDWTELEM v[8];

    for (x = 0; x < w2; x++) {
        for (i = 0; i < 8; i++)
            v[i] = b[av_clip(x-3+i, 0, w2-1)];
        tmp[x] = COMPOSE_FIDELITYiH0(v[0], v[1], v[2], v[3], b[x+w2], v[4], v[5], v[6], v[7]);
    }

    for (x = 0; x < w2; x++) {
        for (i = 0; i < 8; i++)
            v[i] = tmp[av_clip(x-4+i, 0, w2-1)];
        tmp[x+w2] = COMPOSE_FIDELITYiL0(v[0], v[1], v[2], v[3], b[x], v[4], v[5], v[6], v[7]);
    }

    interleave(b, tmp+w2, tmp, w2, 0, 0);
}

static void horizontal_compose_daub97i(IDWTELEM *b, IDWTELEM *temp, int w)
{
    const int w2 = w >> 1;
    int x, b0, b1, b2;

    temp[0] = COMPOSE_DAUB97iL1(b[w2], b[0], b[w2]);
    for (x = 1; x < w2; x++) {
        temp[x     ] = COMPOSE_DAUB97iL1(b[x+w2-1], b[x     ], b[x+w2]);
        temp[x+w2-1] = COMPOSE_DAUB97iH1(temp[x-1], b[x+w2-1], temp[x]);
    }
    temp[w-1] = COMPOSE_DAUB97iH1(temp[w2-1], b[w-1], temp[w2-1]);

    // second stage combined with interleave and shift
    b0 = b2 = COMPOSE_DAUB97iL0(temp[w2], temp[0], temp[w2]);
    b[0] = (b0 + 1) >> 1;
    for (x = 1; x < w2; x++) {
        b2 = COMPOSE_DAUB97iL0(temp[x+w2-1], temp[x     ], temp[x+w2]);
        b1 = COMPOSE_DAUB97iH0(          b0, temp[x+w2-1], b2        );
        b[2*x-1] = (b1 + 1) >> 1;
        b[2*x  ] = (b2 + 1) >> 1;
        b0 = b2;
    }
    b[w-1] = (COMPOSE_DAUB97iH0(b2, temp[w-1], b2) + 1) >> 1;
}

static void vertical_compose_dirac53iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width)
{
    int i;

    for(i=0; i<width; i++){
        b1[i] = COMPOSE_DIRAC53iH0(b0[i], b1[i], b2[i]);
    }
}

static void vertical_compose_dd97iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                  IDWTELEM *b3, IDWTELEM *b4, int width)
{
    int i;

    for(i=0; i<width; i++){
        b2[i] = COMPOSE_DD97iH0(b0[i], b1[i], b2[i], b3[i], b4[i]);
    }
}

static void vertical_compose_dd137iL0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                      IDWTELEM *b3, IDWTELEM *b4, int width)
{
    int i;

    for(i=0; i<width; i++){
        b2[i] = COMPOSE_DD137iL0(b0[i], b1[i], b2[i], b3[i], b4[i]);
    }
}

static void vertical_compose_haar(IDWTELEM *b0, IDWTELEM *b1, int width)
{
    int i;

    for (i = 0; i < width; i++) {
        b0[i] = COMPOSE_HAARiL0(b0[i], b1[i]);
        b1[i] = COMPOSE_HAARiH0(b1[i], b0[i]);
    }
}

static void vertical_compose_fidelityiH0(IDWTELEM *dst, IDWTELEM *b[8], int width)
{
    int i;

    for(i=0; i<width; i++){
        dst[i] = COMPOSE_FIDELITYiH0(b[0][i], b[1][i], b[2][i], b[3][i], dst[i], b[4][i], b[5][i], b[6][i], b[7][i]);
    }
}

static void vertical_compose_fidelityiL0(IDWTELEM *dst, IDWTELEM *b[8], int width)
{
    int i;

    for(i=0; i<width; i++){
        dst[i] = COMPOSE_FIDELITYiL0(b[0][i], b[1][i], b[2][i], b[3][i], dst[i], b[4][i], b[5][i], b[6][i], b[7][i]);
    }
}

static void vertical_compose_daub97iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width)
{
    int i;

    for(i=0; i<width; i++){
        b1[i] = COMPOSE_DAUB97iH0(b0[i], b1[i], b2[i]);
    }
}

static void vertical_compose_daub97iH1(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width)
{
    int i;

    for(i=0; i<width; i++){
        b1[i] = COMPOSE_DAUB97iH1(b0[i], b1[i], b2[i]);
    }
}

static void vertical_compose_daub97iL0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width)
{
    int i;

    for(i=0; i<width; i++){
        b1[i] = COMPOSE_DAUB97iL0(b0[i], b1[i], b2[i]);
    }
}

static void vertical_compose_daub97iL1(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width)
{
    int i;

    for(i=0; i<width; i++){
        b1[i] = COMPOSE_DAUB97iL1(b0[i], b1[i], b2[i]);
    }
}


static void spatial_compose_dd97i_dy(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_3tap vertical_compose_l0 = (void*)d->vertical_compose_l0;
    vertical_compose_5tap vertical_compose_h0 = (void*)d->vertical_compose_h0;
    DWTCompose *cs = d->cs + level;

    int i, y = cs->y;
    IDWTELEM *b[8];
    for (i = 0; i < 6; i++)
        b[i] = cs->b[i];
    b[6] = d->buffer + av_clip(y+5, 0, height-2)*stride;
    b[7] = d->buffer + av_clip(y+6, 1, height-1)*stride;

        if(y+5<(unsigned)height) vertical_compose_l0(      b[5], b[6], b[7],       width);
        if(y+1<(unsigned)height) vertical_compose_h0(b[0], b[2], b[3], b[4], b[6], width);

        if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
        if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);

    for (i = 0; i < 6; i++)
        cs->b[i] = b[i+2];
    cs->y += 2;
}

static void spatial_compose_dirac53i_dy(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_3tap vertical_compose_l0 = (void*)d->vertical_compose_l0;
    vertical_compose_3tap vertical_compose_h0 = (void*)d->vertical_compose_h0;
    DWTCompose *cs = d->cs + level;

    int y= cs->y;
    IDWTELEM *b[4] = { cs->b[0], cs->b[1] };
    b[2] = d->buffer + avpriv_mirror(y+1, height-1)*stride;
    b[3] = d->buffer + avpriv_mirror(y+2, height-1)*stride;

        if(y+1<(unsigned)height) vertical_compose_l0(b[1], b[2], b[3], width);
        if(y+0<(unsigned)height) vertical_compose_h0(b[0], b[1], b[2], width);

        if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
        if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);

    cs->b[0] = b[2];
    cs->b[1] = b[3];
    cs->y += 2;
}


static void spatial_compose_dd137i_dy(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_5tap vertical_compose_l0 = (void*)d->vertical_compose_l0;
    vertical_compose_5tap vertical_compose_h0 = (void*)d->vertical_compose_h0;
    DWTCompose *cs = d->cs + level;

    int i, y = cs->y;
    IDWTELEM *b[10];
    for (i = 0; i < 8; i++)
        b[i] = cs->b[i];
    b[8] = d->buffer + av_clip(y+7, 0, height-2)*stride;
    b[9] = d->buffer + av_clip(y+8, 1, height-1)*stride;

        if(y+5<(unsigned)height) vertical_compose_l0(b[3], b[5], b[6], b[7], b[9], width);
        if(y+1<(unsigned)height) vertical_compose_h0(b[0], b[2], b[3], b[4], b[6], width);

        if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
        if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);

    for (i = 0; i < 8; i++)
        cs->b[i] = b[i+2];
    cs->y += 2;
}

// haar makes the assumption that height is even (always true for dirac)
static void spatial_compose_haari_dy(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_2tap vertical_compose = (void*)d->vertical_compose;
    int y = d->cs[level].y;
    IDWTELEM *b0 = d->buffer + (y-1)*stride;
    IDWTELEM *b1 = d->buffer + (y  )*stride;

    vertical_compose(b0, b1, width);
    d->horizontal_compose(b0, d->temp, width);
    d->horizontal_compose(b1, d->temp, width);

    d->cs[level].y += 2;
}

// Don't do sliced idwt for fidelity; the 9 tap filter makes it a bit annoying
// Fortunately, this filter isn't used in practice.
static void spatial_compose_fidelity(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_9tap vertical_compose_l0 = (void*)d->vertical_compose_l0;
    vertical_compose_9tap vertical_compose_h0 = (void*)d->vertical_compose_h0;
    int i, y;
    IDWTELEM *b[8];

    for (y = 1; y < height; y += 2) {
        for (i = 0; i < 8; i++)
            b[i] = d->buffer + av_clip((y-7 + 2*i), 0, height-2)*stride;
        vertical_compose_h0(d->buffer + y*stride, b, width);
    }

    for (y = 0; y < height; y += 2) {
        for (i = 0; i < 8; i++)
            b[i] = d->buffer + av_clip((y-7 + 2*i), 1, height-1)*stride;
        vertical_compose_l0(d->buffer + y*stride, b, width);
    }

    for (y = 0; y < height; y++)
        d->horizontal_compose(d->buffer + y*stride, d->temp, width);

    d->cs[level].y = height+1;
}

static void spatial_compose_daub97i_dy(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_3tap vertical_compose_l0 = (void*)d->vertical_compose_l0;
    vertical_compose_3tap vertical_compose_h0 = (void*)d->vertical_compose_h0;
    vertical_compose_3tap vertical_compose_l1 = (void*)d->vertical_compose_l1;
    vertical_compose_3tap vertical_compose_h1 = (void*)d->vertical_compose_h1;
    DWTCompose *cs = d->cs + level;

    int i, y = cs->y;
    IDWTELEM *b[6];
    for (i = 0; i < 4; i++)
        b[i] = cs->b[i];
    b[4] = d->buffer + avpriv_mirror(y+3, height-1)*stride;
    b[5] = d->buffer + avpriv_mirror(y+4, height-1)*stride;

        if(y+3<(unsigned)height) vertical_compose_l1(b[3], b[4], b[5], width);
        if(y+2<(unsigned)height) vertical_compose_h1(b[2], b[3], b[4], width);
        if(y+1<(unsigned)height) vertical_compose_l0(b[1], b[2], b[3], width);
        if(y+0<(unsigned)height) vertical_compose_h0(b[0], b[1], b[2], width);

        if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
        if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);

    for (i = 0; i < 4; i++)
        cs->b[i] = b[i+2];
    cs->y += 2;
}


static void spatial_compose97i_init2(DWTCompose *cs, IDWTELEM *buffer, int height, int stride)
{
    cs->b[0] = buffer + avpriv_mirror(-3-1, height-1)*stride;
    cs->b[1] = buffer + avpriv_mirror(-3  , height-1)*stride;
    cs->b[2] = buffer + avpriv_mirror(-3+1, height-1)*stride;
    cs->b[3] = buffer + avpriv_mirror(-3+2, height-1)*stride;
    cs->y = -3;
}

static void spatial_compose53i_init2(DWTCompose *cs, IDWTELEM *buffer, int height, int stride)
{
    cs->b[0] = buffer + avpriv_mirror(-1-1, height-1)*stride;
    cs->b[1] = buffer + avpriv_mirror(-1  , height-1)*stride;
    cs->y = -1;
}

static void spatial_compose_dd97i_init(DWTCompose *cs, IDWTELEM *buffer, int height, int stride)
{
    cs->b[0] = buffer + av_clip(-5-1, 0, height-2)*stride;
    cs->b[1] = buffer + av_clip(-5  , 1, height-1)*stride;
    cs->b[2] = buffer + av_clip(-5+1, 0, height-2)*stride;
    cs->b[3] = buffer + av_clip(-5+2, 1, height-1)*stride;
    cs->b[4] = buffer + av_clip(-5+3, 0, height-2)*stride;
    cs->b[5] = buffer + av_clip(-5+4, 1, height-1)*stride;
    cs->y = -5;
}

static void spatial_compose_dd137i_init(DWTCompose *cs, IDWTELEM *buffer, int height, int stride)
{
    cs->b[0] = buffer + av_clip(-5-1, 0, height-2)*stride;
    cs->b[1] = buffer + av_clip(-5  , 1, height-1)*stride;
    cs->b[2] = buffer + av_clip(-5+1, 0, height-2)*stride;
    cs->b[3] = buffer + av_clip(-5+2, 1, height-1)*stride;
    cs->b[4] = buffer + av_clip(-5+3, 0, height-2)*stride;
    cs->b[5] = buffer + av_clip(-5+4, 1, height-1)*stride;
    cs->b[6] = buffer + av_clip(-5+5, 0, height-2)*stride;
    cs->b[7] = buffer + av_clip(-5+6, 1, height-1)*stride;
    cs->y = -5;
}

int ff_spatial_idwt_init2(DWTContext *d, IDWTELEM *buffer, int width, int height,
                          int stride, enum dwt_type type, int decomposition_count,
                          IDWTELEM *temp)
{
    int level;

    d->buffer = buffer;
    d->width = width;
    d->height = height;
    d->stride = stride;
    d->decomposition_count = decomposition_count;
    d->temp = temp + 8;

    for(level=decomposition_count-1; level>=0; level--){
        int hl = height >> level;
        int stride_l = stride << level;

        switch(type){
        case DWT_DIRAC_DD9_7:
            spatial_compose_dd97i_init(d->cs+level, buffer, hl, stride_l);
            break;
        case DWT_DIRAC_LEGALL5_3:
            spatial_compose53i_init2(d->cs+level, buffer, hl, stride_l);
            break;
        case DWT_DIRAC_DD13_7:
            spatial_compose_dd137i_init(d->cs+level, buffer, hl, stride_l);
            break;
        case DWT_DIRAC_HAAR0:
        case DWT_DIRAC_HAAR1:
            d->cs[level].y = 1;
            break;
        case DWT_DIRAC_DAUB9_7:
            spatial_compose97i_init2(d->cs+level, buffer, hl, stride_l);
            break;
        default:
            d->cs[level].y = 0;
            break;
        }
    }

    switch (type) {
    case DWT_DIRAC_DD9_7:
        d->spatial_compose = spatial_compose_dd97i_dy;
        d->vertical_compose_l0 = (void*)vertical_compose53iL0;
        d->vertical_compose_h0 = (void*)vertical_compose_dd97iH0;
        d->horizontal_compose = horizontal_compose_dd97i;
        d->support = 7;
        break;
    case DWT_DIRAC_LEGALL5_3:
        d->spatial_compose = spatial_compose_dirac53i_dy;
        d->vertical_compose_l0 = (void*)vertical_compose53iL0;
        d->vertical_compose_h0 = (void*)vertical_compose_dirac53iH0;
        d->horizontal_compose = horizontal_compose_dirac53i;
        d->support = 3;
        break;
    case DWT_DIRAC_DD13_7:
        d->spatial_compose = spatial_compose_dd137i_dy;
        d->vertical_compose_l0 = (void*)vertical_compose_dd137iL0;
        d->vertical_compose_h0 = (void*)vertical_compose_dd97iH0;
        d->horizontal_compose = horizontal_compose_dd137i;
        d->support = 7;
        break;
    case DWT_DIRAC_HAAR0:
    case DWT_DIRAC_HAAR1:
        d->spatial_compose = spatial_compose_haari_dy;
        d->vertical_compose = (void*)vertical_compose_haar;
        if (type == DWT_DIRAC_HAAR0)
            d->horizontal_compose = horizontal_compose_haar0i;
        else
            d->horizontal_compose = horizontal_compose_haar1i;
        d->support = 1;
        break;
    case DWT_DIRAC_FIDELITY:
        d->spatial_compose = spatial_compose_fidelity;
        d->vertical_compose_l0 = (void*)vertical_compose_fidelityiL0;
        d->vertical_compose_h0 = (void*)vertical_compose_fidelityiH0;
        d->horizontal_compose = horizontal_compose_fidelityi;
        d->support = 0; // not really used
        break;
    case DWT_DIRAC_DAUB9_7:
        d->spatial_compose = spatial_compose_daub97i_dy;
        d->vertical_compose_l0 = (void*)vertical_compose_daub97iL0;
        d->vertical_compose_h0 = (void*)vertical_compose_daub97iH0;
        d->vertical_compose_l1 = (void*)vertical_compose_daub97iL1;
        d->vertical_compose_h1 = (void*)vertical_compose_daub97iH1;
        d->horizontal_compose = horizontal_compose_daub97i;
        d->support = 5;
        break;
    default:
        av_log(NULL, AV_LOG_ERROR, "Unknown wavelet type %d\n", type);
        return -1;
    }

    if (HAVE_MMX) ff_spatial_idwt_init_mmx(d, type);

    return 0;
}

void ff_spatial_idwt_slice2(DWTContext *d, int y)
{
    int level, support = d->support;

    for (level = d->decomposition_count-1; level >= 0; level--) {
        int wl = d->width  >> level;
        int hl = d->height >> level;
        int stride_l = d->stride << level;

        while (d->cs[level].y <= FFMIN((y>>level)+support, hl))
            d->spatial_compose(d, level, wl, hl, stride_l);
    }
}
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root/libavcodec/dirac_dwt.c

DEFINITIONS
