[deb_ffmpeg.git] / ffmpeg / libavcodec / dirac_dwt.c

/*
 * 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 inline int mirror(int v, int m)
{
    while ((unsigned)v > (unsigned)m) {
        v = -v;
        if (v < 0)
            v += 2 * m;
    }
    return v;
}

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 + mirror(y+1, height-1)*stride;
    b[3] = d->buffer + 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 + mirror(y+3, height-1)*stride;
    b[5] = d->buffer + 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 + mirror(-3-1, height-1)*stride;
    cs->b[1] = buffer + mirror(-3  , height-1)*stride;
    cs->b[2] = buffer + mirror(-3+1, height-1)*stride;
    cs->b[3] = buffer + 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 + mirror(-1-1, height-1)*stride;
    cs->b[1] = buffer + 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);
    }
}
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Copyright (C) 2004-2010 Michael Niedermayer <michaelni@gmx.at>
	3	* Copyright (C) 2008 David Conrad
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include "libavutil/attributes.h"
	23	#include "libavutil/avassert.h"
	24	#include "libavutil/common.h"
	25	#include "dirac_dwt.h"
	26	#include "libavcodec/x86/dirac_dwt.h"
	27
	28
	29	static inline int mirror(int v, int m)
	30	{
	31	while ((unsigned)v > (unsigned)m) {
	32	v = -v;
	33	if (v < 0)
	34	v += 2 * m;
	35	}
	36	return v;
	37	}
	38
	39	static void vertical_compose53iL0(IDWTELEM b0, IDWTELEM b1, IDWTELEM *b2,
	40	int width)
	41	{
	42	int i;
	43
	44	for (i = 0; i < width; i++)
	45	b1[i] -= (b0[i] + b2[i] + 2) >> 2;
	46	}
	47
	48
	49	static av_always_inline
	50	void interleave(IDWTELEM dst, IDWTELEM src0, IDWTELEM *src1, int w2, int add, int shift)
	51	{
	52	int i;
	53	for (i = 0; i < w2; i++) {
	54	dst[2*i ] = (src0[i] + add) >> shift;
	55	dst[2*i+1] = (src1[i] + add) >> shift;
	56	}
	57	}
	58
	59	static void horizontal_compose_dirac53i(IDWTELEM b, IDWTELEM temp, int w)
	60	{
	61	const int w2 = w >> 1;
	62	int x;
	63
	64	temp[0] = COMPOSE_53iL0(b[w2], b[0], b[w2]);
65	for (x = 1; x < w2; x++) {
66	temp[x ] = COMPOSE_53iL0 (b[x+w2-1], b[x ], b[x+w2]);
67	temp[x+w2-1] = COMPOSE_DIRAC53iH0(temp[x-1], b[x+w2-1], temp[x]);
68	}
69	temp[w-1] = COMPOSE_DIRAC53iH0(temp[w2-1], b[w-1], temp[w2-1]);
70
71	interleave(b, temp, temp+w2, w2, 1, 1);
72	}
73
74	static void horizontal_compose_dd97i(IDWTELEM b, IDWTELEM tmp, int w)
75	{
76	const int w2 = w >> 1;
77	int x;
78
79	tmp[0] = COMPOSE_53iL0(b[w2], b[0], b[w2]);
80	for (x = 1; x < w2; x++)
81	tmp[x] = COMPOSE_53iL0(b[x+w2-1], b[x], b[x+w2]);
82
83	// extend the edges
84	tmp[-1] = tmp[0];
85	tmp[w2+1] = tmp[w2] = tmp[w2-1];
86
87	for (x = 0; x < w2; x++) {
88	b[2*x ] = (tmp[x] + 1)>>1;
89	b[2*x+1] = (COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1)>>1;
90	}
91	}
92
93	static void horizontal_compose_dd137i(IDWTELEM b, IDWTELEM tmp, int w)
94	{
95	const int w2 = w >> 1;
96	int x;
97
98	tmp[0] = COMPOSE_DD137iL0(b[w2], b[w2], b[0], b[w2 ], b[w2+1]);
99	tmp[1] = COMPOSE_DD137iL0(b[w2], b[w2], b[1], b[w2+1], b[w2+2]);
100	for (x = 2; x < w2-1; x++)
101	tmp[x] = COMPOSE_DD137iL0(b[x+w2-2], b[x+w2-1], b[x], b[x+w2], b[x+w2+1]);
102	tmp[w2-1] = COMPOSE_DD137iL0(b[w-3], b[w-2], b[w2-1], b[w-1], b[w-1]);
103
104	// extend the edges
105	tmp[-1] = tmp[0];
106	tmp[w2+1] = tmp[w2] = tmp[w2-1];
107
108	for (x = 0; x < w2; x++) {
109	b[2*x ] = (tmp[x] + 1)>>1;
110	b[2*x+1] = (COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1)>>1;
111	}
112	}
113
114	static av_always_inline
115	void horizontal_compose_haari(IDWTELEM b, IDWTELEM temp, int w, int shift)
116	{
117	const int w2 = w >> 1;
118	int x;
119
120	for (x = 0; x < w2; x++) {
121	temp[x ] = COMPOSE_HAARiL0(b[x ], b[x+w2]);
122	temp[x+w2] = COMPOSE_HAARiH0(b[x+w2], temp[x]);
123	}
124
125	interleave(b, temp, temp+w2, w2, shift, shift);
126	}
127
128	static void horizontal_compose_haar0i(IDWTELEM b, IDWTELEM temp, int w)
129	{
130	horizontal_compose_haari(b, temp, w, 0);
131	}
132
133	static void horizontal_compose_haar1i(IDWTELEM b, IDWTELEM temp, int w)
134	{
135	horizontal_compose_haari(b, temp, w, 1);
136	}
137
138	static void horizontal_compose_fidelityi(IDWTELEM b, IDWTELEM tmp, int w)
139	{
140	const int w2 = w >> 1;
141	int i, x;
142	IDWTELEM v[8];
143
144	for (x = 0; x < w2; x++) {
145	for (i = 0; i < 8; i++)
146	v[i] = b[av_clip(x-3+i, 0, w2-1)];
147	tmp[x] = COMPOSE_FIDELITYiH0(v[0], v[1], v[2], v[3], b[x+w2], v[4], v[5], v[6], v[7]);
148	}
149
150	for (x = 0; x < w2; x++) {
151	for (i = 0; i < 8; i++)
152	v[i] = tmp[av_clip(x-4+i, 0, w2-1)];
153	tmp[x+w2] = COMPOSE_FIDELITYiL0(v[0], v[1], v[2], v[3], b[x], v[4], v[5], v[6], v[7]);
154	}
155
156	interleave(b, tmp+w2, tmp, w2, 0, 0);
157	}
158
159	static void horizontal_compose_daub97i(IDWTELEM b, IDWTELEM temp, int w)
160	{
161	const int w2 = w >> 1;
162	int x, b0, b1, b2;
163
164	temp[0] = COMPOSE_DAUB97iL1(b[w2], b[0], b[w2]);
165	for (x = 1; x < w2; x++) {
166	temp[x ] = COMPOSE_DAUB97iL1(b[x+w2-1], b[x ], b[x+w2]);
167	temp[x+w2-1] = COMPOSE_DAUB97iH1(temp[x-1], b[x+w2-1], temp[x]);
168	}
169	temp[w-1] = COMPOSE_DAUB97iH1(temp[w2-1], b[w-1], temp[w2-1]);
170
171	// second stage combined with interleave and shift
172	b0 = b2 = COMPOSE_DAUB97iL0(temp[w2], temp[0], temp[w2]);
173	b[0] = (b0 + 1) >> 1;
174	for (x = 1; x < w2; x++) {
175	b2 = COMPOSE_DAUB97iL0(temp[x+w2-1], temp[x ], temp[x+w2]);
176	b1 = COMPOSE_DAUB97iH0( b0, temp[x+w2-1], b2 );
177	b[2*x-1] = (b1 + 1) >> 1;
178	b[2*x ] = (b2 + 1) >> 1;
179	b0 = b2;
180	}
181	b[w-1] = (COMPOSE_DAUB97iH0(b2, temp[w-1], b2) + 1) >> 1;
182	}
183
184	static void vertical_compose_dirac53iH0(IDWTELEM b0, IDWTELEM b1, IDWTELEM *b2, int width)
185	{
186	int i;
187
188	for(i=0; i<width; i++){
189	b1[i] = COMPOSE_DIRAC53iH0(b0[i], b1[i], b2[i]);
190	}
191	}
192
193	static void vertical_compose_dd97iH0(IDWTELEM b0, IDWTELEM b1, IDWTELEM *b2,
194	IDWTELEM b3, IDWTELEM b4, int width)
195	{
196	int i;
197
198	for(i=0; i<width; i++){
199	b2[i] = COMPOSE_DD97iH0(b0[i], b1[i], b2[i], b3[i], b4[i]);
200	}
201	}
202
203	static void vertical_compose_dd137iL0(IDWTELEM b0, IDWTELEM b1, IDWTELEM *b2,
204	IDWTELEM b3, IDWTELEM b4, int width)
205	{
206	int i;
207
208	for(i=0; i<width; i++){
209	b2[i] = COMPOSE_DD137iL0(b0[i], b1[i], b2[i], b3[i], b4[i]);
210	}
211	}
212
213	static void vertical_compose_haar(IDWTELEM b0, IDWTELEM b1, int width)
214	{
215	int i;
216
217	for (i = 0; i < width; i++) {
218	b0[i] = COMPOSE_HAARiL0(b0[i], b1[i]);
219	b1[i] = COMPOSE_HAARiH0(b1[i], b0[i]);
220	}
221	}
222
223	static void vertical_compose_fidelityiH0(IDWTELEM dst, IDWTELEM b[8], int width)
224	{
225	int i;
226
227	for(i=0; i<width; i++){
228	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]);
229	}
230	}
231
232	static void vertical_compose_fidelityiL0(IDWTELEM dst, IDWTELEM b[8], int width)
233	{
234	int i;
235
236	for(i=0; i<width; i++){
237	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]);
238	}
239	}
240
241	static void vertical_compose_daub97iH0(IDWTELEM b0, IDWTELEM b1, IDWTELEM *b2, int width)
242	{
243	int i;
244
245	for(i=0; i<width; i++){
246	b1[i] = COMPOSE_DAUB97iH0(b0[i], b1[i], b2[i]);
247	}
248	}
249
250	static void vertical_compose_daub97iH1(IDWTELEM b0, IDWTELEM b1, IDWTELEM *b2, int width)
251	{
252	int i;
253
254	for(i=0; i<width; i++){
255	b1[i] = COMPOSE_DAUB97iH1(b0[i], b1[i], b2[i]);
256	}
257	}
258
259	static void vertical_compose_daub97iL0(IDWTELEM b0, IDWTELEM b1, IDWTELEM *b2, int width)
260	{
261	int i;
262
263	for(i=0; i<width; i++){
264	b1[i] = COMPOSE_DAUB97iL0(b0[i], b1[i], b2[i]);
265	}
266	}
267
268	static void vertical_compose_daub97iL1(IDWTELEM b0, IDWTELEM b1, IDWTELEM *b2, int width)
269	{
270	int i;
271
272	for(i=0; i<width; i++){
273	b1[i] = COMPOSE_DAUB97iL1(b0[i], b1[i], b2[i]);
274	}
275	}
276
277
278	static void spatial_compose_dd97i_dy(DWTContext *d, int level, int width, int height, int stride)
279	{
280	vertical_compose_3tap vertical_compose_l0 = (void*)d->vertical_compose_l0;
281	vertical_compose_5tap vertical_compose_h0 = (void*)d->vertical_compose_h0;
282	DWTCompose *cs = d->cs + level;
283
284	int i, y = cs->y;
285	IDWTELEM *b[8];
286	for (i = 0; i < 6; i++)
287	b[i] = cs->b[i];
288	b[6] = d->buffer + av_clip(y+5, 0, height-2)*stride;
289	b[7] = d->buffer + av_clip(y+6, 1, height-1)*stride;
290
291	if(y+5<(unsigned)height) vertical_compose_l0( b[5], b[6], b[7], width);
292	if(y+1<(unsigned)height) vertical_compose_h0(b[0], b[2], b[3], b[4], b[6], width);
293
294	if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
295	if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);
296
297	for (i = 0; i < 6; i++)
298	cs->b[i] = b[i+2];
299	cs->y += 2;
300	}
301
302	static void spatial_compose_dirac53i_dy(DWTContext *d, int level, int width, int height, int stride)
303	{
304	vertical_compose_3tap vertical_compose_l0 = (void*)d->vertical_compose_l0;
305	vertical_compose_3tap vertical_compose_h0 = (void*)d->vertical_compose_h0;
306	DWTCompose *cs = d->cs + level;
307
308	int y= cs->y;
309	IDWTELEM *b[4] = { cs->b[0], cs->b[1] };
310	b[2] = d->buffer + mirror(y+1, height-1)*stride;
311	b[3] = d->buffer + mirror(y+2, height-1)*stride;
312
313	if(y+1<(unsigned)height) vertical_compose_l0(b[1], b[2], b[3], width);
314	if(y+0<(unsigned)height) vertical_compose_h0(b[0], b[1], b[2], width);
315
316	if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
317	if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);
318
319	cs->b[0] = b[2];
320	cs->b[1] = b[3];
321	cs->y += 2;
322	}
323
324
325	static void spatial_compose_dd137i_dy(DWTContext *d, int level, int width, int height, int stride)
326	{
327	vertical_compose_5tap vertical_compose_l0 = (void*)d->vertical_compose_l0;
328	vertical_compose_5tap vertical_compose_h0 = (void*)d->vertical_compose_h0;
329	DWTCompose *cs = d->cs + level;
330
331	int i, y = cs->y;
332	IDWTELEM *b[10];
333	for (i = 0; i < 8; i++)
334	b[i] = cs->b[i];
335	b[8] = d->buffer + av_clip(y+7, 0, height-2)*stride;
336	b[9] = d->buffer + av_clip(y+8, 1, height-1)*stride;
337
338	if(y+5<(unsigned)height) vertical_compose_l0(b[3], b[5], b[6], b[7], b[9], width);
339	if(y+1<(unsigned)height) vertical_compose_h0(b[0], b[2], b[3], b[4], b[6], width);
340
341	if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
342	if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);
343
344	for (i = 0; i < 8; i++)
345	cs->b[i] = b[i+2];
346	cs->y += 2;
347	}
348
349	// haar makes the assumption that height is even (always true for dirac)
350	static void spatial_compose_haari_dy(DWTContext *d, int level, int width, int height, int stride)
351	{
352	vertical_compose_2tap vertical_compose = (void*)d->vertical_compose;
353	int y = d->cs[level].y;
354	IDWTELEM b0 = d->buffer + (y-1)stride;
355	IDWTELEM b1 = d->buffer + (y )stride;
356
357	vertical_compose(b0, b1, width);
358	d->horizontal_compose(b0, d->temp, width);
359	d->horizontal_compose(b1, d->temp, width);
360
361	d->cs[level].y += 2;
362	}
363
364	// Don't do sliced idwt for fidelity; the 9 tap filter makes it a bit annoying
365	// Fortunately, this filter isn't used in practice.
366	static void spatial_compose_fidelity(DWTContext *d, int level, int width, int height, int stride)
367	{
368	vertical_compose_9tap vertical_compose_l0 = (void*)d->vertical_compose_l0;
369	vertical_compose_9tap vertical_compose_h0 = (void*)d->vertical_compose_h0;
370	int i, y;
371	IDWTELEM *b[8];
372
373	for (y = 1; y < height; y += 2) {
374	for (i = 0; i < 8; i++)
375	b[i] = d->buffer + av_clip((y-7 + 2i), 0, height-2)stride;
376	vertical_compose_h0(d->buffer + y*stride, b, width);
377	}
378
379	for (y = 0; y < height; y += 2) {
380	for (i = 0; i < 8; i++)
381	b[i] = d->buffer + av_clip((y-7 + 2i), 1, height-1)stride;
382	vertical_compose_l0(d->buffer + y*stride, b, width);
383	}
384
385	for (y = 0; y < height; y++)
386	d->horizontal_compose(d->buffer + y*stride, d->temp, width);
387
388	d->cs[level].y = height+1;
389	}
390
391	static void spatial_compose_daub97i_dy(DWTContext *d, int level, int width, int height, int stride)
392	{
393	vertical_compose_3tap vertical_compose_l0 = (void*)d->vertical_compose_l0;
394	vertical_compose_3tap vertical_compose_h0 = (void*)d->vertical_compose_h0;
395	vertical_compose_3tap vertical_compose_l1 = (void*)d->vertical_compose_l1;
396	vertical_compose_3tap vertical_compose_h1 = (void*)d->vertical_compose_h1;
397	DWTCompose *cs = d->cs + level;
398
399	int i, y = cs->y;
400	IDWTELEM *b[6];
401	for (i = 0; i < 4; i++)
402	b[i] = cs->b[i];
403	b[4] = d->buffer + mirror(y+3, height-1)*stride;
404	b[5] = d->buffer + mirror(y+4, height-1)*stride;
405
406	if(y+3<(unsigned)height) vertical_compose_l1(b[3], b[4], b[5], width);
407	if(y+2<(unsigned)height) vertical_compose_h1(b[2], b[3], b[4], width);
408	if(y+1<(unsigned)height) vertical_compose_l0(b[1], b[2], b[3], width);
409	if(y+0<(unsigned)height) vertical_compose_h0(b[0], b[1], b[2], width);
410
411	if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
412	if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);
413
414	for (i = 0; i < 4; i++)
415	cs->b[i] = b[i+2];
416	cs->y += 2;
417	}
418
419
420	static void spatial_compose97i_init2(DWTCompose cs, IDWTELEM buffer, int height, int stride)
421	{
422	cs->b[0] = buffer + mirror(-3-1, height-1)*stride;
423	cs->b[1] = buffer + mirror(-3 , height-1)*stride;
424	cs->b[2] = buffer + mirror(-3+1, height-1)*stride;
425	cs->b[3] = buffer + mirror(-3+2, height-1)*stride;
426	cs->y = -3;
427	}
428
429	static void spatial_compose53i_init2(DWTCompose cs, IDWTELEM buffer, int height, int stride)
430	{
431	cs->b[0] = buffer + mirror(-1-1, height-1)*stride;
432	cs->b[1] = buffer + mirror(-1 , height-1)*stride;
433	cs->y = -1;
434	}
435
436	static void spatial_compose_dd97i_init(DWTCompose cs, IDWTELEM buffer, int height, int stride)
437	{
438	cs->b[0] = buffer + av_clip(-5-1, 0, height-2)*stride;
439	cs->b[1] = buffer + av_clip(-5 , 1, height-1)*stride;
440	cs->b[2] = buffer + av_clip(-5+1, 0, height-2)*stride;
441	cs->b[3] = buffer + av_clip(-5+2, 1, height-1)*stride;
442	cs->b[4] = buffer + av_clip(-5+3, 0, height-2)*stride;
443	cs->b[5] = buffer + av_clip(-5+4, 1, height-1)*stride;
444	cs->y = -5;
445	}
446
447	static void spatial_compose_dd137i_init(DWTCompose cs, IDWTELEM buffer, int height, int stride)
448	{
449	cs->b[0] = buffer + av_clip(-5-1, 0, height-2)*stride;
450	cs->b[1] = buffer + av_clip(-5 , 1, height-1)*stride;
451	cs->b[2] = buffer + av_clip(-5+1, 0, height-2)*stride;
452	cs->b[3] = buffer + av_clip(-5+2, 1, height-1)*stride;
453	cs->b[4] = buffer + av_clip(-5+3, 0, height-2)*stride;
454	cs->b[5] = buffer + av_clip(-5+4, 1, height-1)*stride;
455	cs->b[6] = buffer + av_clip(-5+5, 0, height-2)*stride;
456	cs->b[7] = buffer + av_clip(-5+6, 1, height-1)*stride;
457	cs->y = -5;
458	}
459
460	int ff_spatial_idwt_init2(DWTContext d, IDWTELEM buffer, int width, int height,
461	int stride, enum dwt_type type, int decomposition_count,
462	IDWTELEM *temp)
463	{
464	int level;
465
466	d->buffer = buffer;
467	d->width = width;
468	d->height = height;
469	d->stride = stride;
470	d->decomposition_count = decomposition_count;
471	d->temp = temp + 8;
472
473	for(level=decomposition_count-1; level>=0; level--){
474	int hl = height >> level;
475	int stride_l = stride << level;
476
477	switch(type){
478	case DWT_DIRAC_DD9_7:
479	spatial_compose_dd97i_init(d->cs+level, buffer, hl, stride_l);
480	break;
481	case DWT_DIRAC_LEGALL5_3:
482	spatial_compose53i_init2(d->cs+level, buffer, hl, stride_l);
483	break;
484	case DWT_DIRAC_DD13_7:
485	spatial_compose_dd137i_init(d->cs+level, buffer, hl, stride_l);
486	break;
487	case DWT_DIRAC_HAAR0:
488	case DWT_DIRAC_HAAR1:
489	d->cs[level].y = 1;
490	break;
491	case DWT_DIRAC_DAUB9_7:
492	spatial_compose97i_init2(d->cs+level, buffer, hl, stride_l);
493	break;
494	default:
495	d->cs[level].y = 0;
496	break;
497	}
498	}
499
500	switch (type) {
501	case DWT_DIRAC_DD9_7:
502	d->spatial_compose = spatial_compose_dd97i_dy;
503	d->vertical_compose_l0 = (void*)vertical_compose53iL0;
504	d->vertical_compose_h0 = (void*)vertical_compose_dd97iH0;
505	d->horizontal_compose = horizontal_compose_dd97i;
506	d->support = 7;
507	break;
508	case DWT_DIRAC_LEGALL5_3:
509	d->spatial_compose = spatial_compose_dirac53i_dy;
510	d->vertical_compose_l0 = (void*)vertical_compose53iL0;
511	d->vertical_compose_h0 = (void*)vertical_compose_dirac53iH0;
512	d->horizontal_compose = horizontal_compose_dirac53i;
513	d->support = 3;
514	break;
515	case DWT_DIRAC_DD13_7:
516	d->spatial_compose = spatial_compose_dd137i_dy;
517	d->vertical_compose_l0 = (void*)vertical_compose_dd137iL0;
518	d->vertical_compose_h0 = (void*)vertical_compose_dd97iH0;
519	d->horizontal_compose = horizontal_compose_dd137i;
520	d->support = 7;
521	break;
522	case DWT_DIRAC_HAAR0:
523	case DWT_DIRAC_HAAR1:
524	d->spatial_compose = spatial_compose_haari_dy;
525	d->vertical_compose = (void*)vertical_compose_haar;
526	if (type == DWT_DIRAC_HAAR0)
527	d->horizontal_compose = horizontal_compose_haar0i;
528	else
529	d->horizontal_compose = horizontal_compose_haar1i;
530	d->support = 1;
531	break;
532	case DWT_DIRAC_FIDELITY:
533	d->spatial_compose = spatial_compose_fidelity;
534	d->vertical_compose_l0 = (void*)vertical_compose_fidelityiL0;
535	d->vertical_compose_h0 = (void*)vertical_compose_fidelityiH0;
536	d->horizontal_compose = horizontal_compose_fidelityi;
537	d->support = 0; // not really used
538	break;
539	case DWT_DIRAC_DAUB9_7:
540	d->spatial_compose = spatial_compose_daub97i_dy;
541	d->vertical_compose_l0 = (void*)vertical_compose_daub97iL0;
542	d->vertical_compose_h0 = (void*)vertical_compose_daub97iH0;
543	d->vertical_compose_l1 = (void*)vertical_compose_daub97iL1;
544	d->vertical_compose_h1 = (void*)vertical_compose_daub97iH1;
545	d->horizontal_compose = horizontal_compose_daub97i;
546	d->support = 5;
547	break;
548	default:
549	av_log(NULL, AV_LOG_ERROR, "Unknown wavelet type %d\n", type);
550	return -1;
551	}
552
553	if (HAVE_MMX) ff_spatial_idwt_init_mmx(d, type);
554
555	return 0;
556	}
557
558	void ff_spatial_idwt_slice2(DWTContext *d, int y)
559	{
560	int level, support = d->support;
561
562	for (level = d->decomposition_count-1; level >= 0; level--) {
563	int wl = d->width >> level;
564	int hl = d->height >> level;
565	int stride_l = d->stride << level;
566
567	while (d->cs[level].y <= FFMIN((y>>level)+support, hl))
568	d->spatial_compose(d, level, wl, hl, stride_l);
569	}
570	}
571