dewarp1.c

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/*====================================================================*
 -  Copyright (C) 2001 Leptonica.  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 ANY
 -  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.
 *====================================================================*/
 
#ifdef HAVE_CONFIG_H
#include <config_auto.h>
#endif  /* HAVE_CONFIG_H */
 
#include <math.h>
#include "allheaders.h"
 
static l_int32 dewarpaExtendArraysToSize(L_DEWARPA *dewa, l_int32 size);
 
    /* Parameter values used in dewarpaCreate() */
static const l_int32     InitialPtrArraySize = 20;   /* n'import quoi */
static const l_int32     MaxPtrArraySize = 10000;
static const l_int32     DefaultArraySampling = 30;
static const l_int32     MinArraySampling = 8;
static const l_int32     DefaultMinLines = 15;
static const l_int32     MinMinLines = 4;
static const l_int32     DefaultMaxRefDist = 16;
static const l_int32     DefaultUseBoth = TRUE;
static const l_int32     DefaultCheckColumns = TRUE;
 
    /* Parameter values used in dewarpaSetCurvatures() */
static const l_int32     DefaultMaxLineCurv = 150;
static const l_int32     DefaultMinDiffLineCurv = 0;
static const l_int32     DefaultMaxDiffLineCurv = 170;
static const l_int32     DefaultMaxEdgeCurv = 50;
static const l_int32     DefaultMaxDiffEdgeCurv = 40;
static const l_int32     DefaultMaxEdgeSlope = 80;
 
/*----------------------------------------------------------------------*
 *                           Create/destroy Dewarp                      *
 *----------------------------------------------------------------------*/
L_DEWARP *
dewarpCreate(PIX     *pixs,
             l_int32  pageno)
{
L_DEWARP  *dew;
 
    if (!pixs)
        return (L_DEWARP *)ERROR_PTR("pixs not defined", __func__, NULL);
    if (pixGetDepth(pixs) != 1)
        return (L_DEWARP *)ERROR_PTR("pixs not 1 bpp", __func__, NULL);
 
    dew = (L_DEWARP *)LEPT_CALLOC(1, sizeof(L_DEWARP));
    dew->pixs = pixClone(pixs);
    dew->pageno = pageno;
    dew->w = pixGetWidth(pixs);
    dew->h = pixGetHeight(pixs);
    return dew;
}
 
 
L_DEWARP *
dewarpCreateRef(l_int32  pageno,
                l_int32  refpage)
{
L_DEWARP  *dew;
 
    dew = (L_DEWARP *)LEPT_CALLOC(1, sizeof(L_DEWARP));
    dew->pageno = pageno;
    dew->hasref = 1;
    dew->refpage = refpage;
    return dew;
}
 
 
void
dewarpDestroy(L_DEWARP  **pdew)
{
L_DEWARP  *dew;
 
    if (pdew == NULL) {
        L_WARNING("ptr address is null!\n", __func__);
        return;
    }
    if ((dew = *pdew) == NULL)
        return;
 
    pixDestroy(&dew->pixs);
    fpixDestroy(&dew->sampvdispar);
    fpixDestroy(&dew->samphdispar);
    fpixDestroy(&dew->sampydispar);
    fpixDestroy(&dew->fullvdispar);
    fpixDestroy(&dew->fullhdispar);
    fpixDestroy(&dew->fullydispar);
    numaDestroy(&dew->namidys);
    numaDestroy(&dew->nacurves);
    LEPT_FREE(dew);
    *pdew = NULL;
}
 
 
/*----------------------------------------------------------------------*
 *                          Create/destroy Dewarpa                      *
 *----------------------------------------------------------------------*/
L_DEWARPA *
dewarpaCreate(l_int32  nptrs,
              l_int32  sampling,
              l_int32  redfactor,
              l_int32  minlines,
              l_int32  maxdist)
{
L_DEWARPA  *dewa;
 
    if (nptrs <= 0)
        nptrs = InitialPtrArraySize;
    if (nptrs > MaxPtrArraySize)
        return (L_DEWARPA *)ERROR_PTR("too many pages", __func__, NULL);
    if (redfactor != 1 && redfactor != 2)
        return (L_DEWARPA *)ERROR_PTR("redfactor not in {1,2}",
                                      __func__, NULL);
    if (sampling == 0) {
         sampling = DefaultArraySampling;
    } else if (sampling < MinArraySampling) {
         L_WARNING("sampling too small; setting to %d\n", __func__,
                   MinArraySampling);
         sampling = MinArraySampling;
    }
    if (minlines == 0) {
        minlines = DefaultMinLines;
    } else if (minlines < MinMinLines) {
        L_WARNING("minlines too small; setting to %d\n", __func__,
                  MinMinLines);
        minlines = DefaultMinLines;
    }
    if (maxdist < 0)
         maxdist = DefaultMaxRefDist;
 
    dewa = (L_DEWARPA *)LEPT_CALLOC(1, sizeof(L_DEWARPA));
    dewa->dewarp = (L_DEWARP **)LEPT_CALLOC(nptrs, sizeof(L_DEWARPA *));
    dewa->dewarpcache = (L_DEWARP **)LEPT_CALLOC(nptrs, sizeof(L_DEWARPA *));
    if (!dewa->dewarp || !dewa->dewarpcache) {
        dewarpaDestroy(&dewa);
        return (L_DEWARPA *)ERROR_PTR("dewarp ptrs not made", __func__, NULL);
    }
    dewa->nalloc = nptrs;
    dewa->sampling = sampling;
    dewa->redfactor = redfactor;
    dewa->minlines = minlines;
    dewa->maxdist = maxdist;
    dewa->max_linecurv = DefaultMaxLineCurv;
    dewa->min_diff_linecurv = DefaultMinDiffLineCurv;
    dewa->max_diff_linecurv = DefaultMaxDiffLineCurv;
    dewa->max_edgeslope = DefaultMaxEdgeSlope;
    dewa->max_edgecurv = DefaultMaxEdgeCurv;
    dewa->max_diff_edgecurv = DefaultMaxDiffEdgeCurv;
    dewa->check_columns = DefaultCheckColumns;
    dewa->useboth = DefaultUseBoth;
    return dewa;
}
 
 
L_DEWARPA *
dewarpaCreateFromPixacomp(PIXAC   *pixac,
                          l_int32  useboth,
                          l_int32  sampling,
                          l_int32  minlines,
                          l_int32  maxdist)
{
l_int32     i, nptrs, pageno;
L_DEWARP   *dew;
L_DEWARPA  *dewa;
PIX        *pixt;
 
    if (!pixac)
        return (L_DEWARPA *)ERROR_PTR("pixac not defined", __func__, NULL);
 
    nptrs = pixacompGetCount(pixac);
    if ((dewa = dewarpaCreate(pixacompGetOffset(pixac) + nptrs,
                              sampling, 1, minlines, maxdist)) == NULL)
        return (L_DEWARPA *)ERROR_PTR("dewa not made", __func__, NULL);
    dewarpaUseBothArrays(dewa, useboth);
 
    for (i = 0; i < nptrs; i++) {
        pageno = pixacompGetOffset(pixac) + i;  /* index into pixacomp */
        pixt = pixacompGetPix(pixac, pageno);
        if (pixt && (pixGetWidth(pixt) > 1)) {
            dew = dewarpCreate(pixt, pageno);
            pixDestroy(&pixt);
            if (!dew) {
                ERROR_INT("unable to make dew!", __func__, 1);
                continue;
            }
 
               /* Insert into dewa for this page */
            dewarpaInsertDewarp(dewa, dew);
 
               /* Build disparity arrays for this page */
            dewarpBuildPageModel(dew, NULL);
            if (!dew->vsuccess) {  /* will need to use model from nearby page */
                dewarpaDestroyDewarp(dewa, pageno);
                L_ERROR("unable to build model for page %d\n", __func__, i);
                continue;
            }
                /* Remove all extraneous data */
            dewarpMinimize(dew);
        }
        pixDestroy(&pixt);
    }
    dewarpaInsertRefModels(dewa, 0, 0);
 
    return dewa;
}
 
 
void
dewarpaDestroy(L_DEWARPA  **pdewa)
{
l_int32     i;
L_DEWARP   *dew;
L_DEWARPA  *dewa;
 
    if (pdewa == NULL) {
        L_WARNING("ptr address is null!\n", __func__);
        return;
    }
    if ((dewa = *pdewa) == NULL)
        return;
 
    for (i = 0; i < dewa->nalloc; i++) {
        if ((dew = dewa->dewarp[i]) != NULL)
            dewarpDestroy(&dew);
        if ((dew = dewa->dewarpcache[i]) != NULL)
            dewarpDestroy(&dew);
    }
    numaDestroy(&dewa->namodels);
    numaDestroy(&dewa->napages);
 
    LEPT_FREE(dewa->dewarp);
    LEPT_FREE(dewa->dewarpcache);
    LEPT_FREE(dewa);
    *pdewa = NULL;
}
 
 
l_ok
dewarpaDestroyDewarp(L_DEWARPA  *dewa,
                     l_int32     pageno)
{
L_DEWARP   *dew;
 
    if (!dewa)
        return ERROR_INT("dewa or dew not defined", __func__, 1);
    if (pageno < 0 || pageno > dewa->maxpage)
        return ERROR_INT("page out of bounds", __func__, 1);
    if ((dew = dewa->dewarp[pageno]) == NULL)
        return ERROR_INT("dew not defined", __func__, 1);
 
    dewarpDestroy(&dew);
    dewa->dewarp[pageno] = NULL;
    return 0;
}
 
 
/*----------------------------------------------------------------------*
 *                       Dewarpa insertion/extraction                   *
 *----------------------------------------------------------------------*/
l_ok
dewarpaInsertDewarp(L_DEWARPA  *dewa,
                    L_DEWARP   *dew)
{
l_int32    pageno, n, newsize;
L_DEWARP  *prevdew;
 
    if (!dewa)
        return ERROR_INT("dewa not defined", __func__, 1);
    if (!dew)
        return ERROR_INT("dew not defined", __func__, 1);
 
    dew->dewa = dewa;
    pageno = dew->pageno;
    if (pageno > MaxPtrArraySize)
        return ERROR_INT("too many pages", __func__, 1);
    if (pageno > dewa->maxpage)
        dewa->maxpage = pageno;
    dewa->modelsready = 0;  /* force re-evaluation at application time */
 
        /* Extend ptr array if necessary */
    n = dewa->nalloc;
    newsize = n;
    if (pageno >= 2 * n)
        newsize = 2 * pageno;
    else if (pageno >= n)
        newsize = 2 * n;
    if (newsize > n) {
        if (dewarpaExtendArraysToSize(dewa, newsize))
            return ERROR_INT("extension failed", __func__, 1);
    }
 
    if ((prevdew = dewarpaGetDewarp(dewa, pageno)) != NULL)
        dewarpDestroy(&prevdew);
    dewa->dewarp[pageno] = dew;
 
    dew->sampling = dewa->sampling;
    dew->redfactor = dewa->redfactor;
    dew->minlines = dewa->minlines;
 
        /* Get the dimensions of the sampled array.  This will be
         * stored in an fpix, and the input resolution version is
         * guaranteed to be larger than pixs.  However, if you
         * want to apply the disparity to an image with a width
         *     w > nx * s - 2 * s + 2
         * you will need to extend the input res fpix.
         * And similarly for h.  */
    dew->nx = (dew->w + 2 * dew->sampling - 2) / dew->sampling;
    dew->ny = (dew->h + 2 * dew->sampling - 2) / dew->sampling;
    return 0;
}
 
 
static l_int32
dewarpaExtendArraysToSize(L_DEWARPA  *dewa,
                         l_int32     size)
{
    if (!dewa)
        return ERROR_INT("dewa not defined", __func__, 1);
 
    if (size > dewa->nalloc) {
        if ((dewa->dewarp = (L_DEWARP **)reallocNew((void **)&dewa->dewarp,
                sizeof(L_DEWARP *) * dewa->nalloc,
                size * sizeof(L_DEWARP *))) == NULL)
            return ERROR_INT("new ptr array not returned", __func__, 1);
        if ((dewa->dewarpcache =
                (L_DEWARP **)reallocNew((void **)&dewa->dewarpcache,
                sizeof(L_DEWARP *) * dewa->nalloc,
                size * sizeof(L_DEWARP *))) == NULL)
            return ERROR_INT("new ptr cache array not returned", __func__, 1);
        dewa->nalloc = size;
    }
    return 0;
}
 
 
L_DEWARP *
dewarpaGetDewarp(L_DEWARPA  *dewa,
                 l_int32     index)
{
    if (!dewa)
        return (L_DEWARP *)ERROR_PTR("dewa not defined", __func__, NULL);
    if (index < 0 || index > dewa->maxpage) {
        L_ERROR("index = %d is invalid; max index = %d\n",
                __func__, index, dewa->maxpage);
        return NULL;
    }
 
    return dewa->dewarp[index];
}
 
 
/*----------------------------------------------------------------------*
 *         Setting parameters to control rendering from the model       *
 *----------------------------------------------------------------------*/
l_ok
dewarpaSetCurvatures(L_DEWARPA  *dewa,
                     l_int32     max_linecurv,
                     l_int32     min_diff_linecurv,
                     l_int32     max_diff_linecurv,
                     l_int32     max_edgecurv,
                     l_int32     max_diff_edgecurv,
                     l_int32     max_edgeslope)
{
    if (!dewa)
        return ERROR_INT("dewa not defined", __func__, 1);
 
    if (max_linecurv == -1)
        dewa->max_linecurv = DefaultMaxLineCurv;
    else
        dewa->max_linecurv = L_ABS(max_linecurv);
 
    if (min_diff_linecurv == -1)
        dewa->min_diff_linecurv = DefaultMinDiffLineCurv;
    else
        dewa->min_diff_linecurv = L_ABS(min_diff_linecurv);
 
    if (max_diff_linecurv == -1)
        dewa->max_diff_linecurv = DefaultMaxDiffLineCurv;
    else
        dewa->max_diff_linecurv = L_ABS(max_diff_linecurv);
 
    if (max_edgecurv == -1)
        dewa->max_edgecurv = DefaultMaxEdgeCurv;
    else
        dewa->max_edgecurv = L_ABS(max_edgecurv);
 
    if (max_diff_edgecurv == -1)
        dewa->max_diff_edgecurv = DefaultMaxDiffEdgeCurv;
    else
        dewa->max_diff_edgecurv = L_ABS(max_diff_edgecurv);
 
    if (max_edgeslope == -1)
        dewa->max_edgeslope = DefaultMaxEdgeSlope;
    else
        dewa->max_edgeslope = L_ABS(max_edgeslope);
 
    dewa->modelsready = 0;  /* force validation */
    return 0;
}
 
 
l_ok
dewarpaUseBothArrays(L_DEWARPA  *dewa,
                     l_int32     useboth)
{
    if (!dewa)
        return ERROR_INT("dewa not defined", __func__, 1);
 
    dewa->useboth = useboth;
    dewa->modelsready = 0;  /* force validation */
    return 0;
}
 
 
l_ok
dewarpaSetCheckColumns(L_DEWARPA  *dewa,
                       l_int32     check_columns)
{
    if (!dewa)
        return ERROR_INT("dewa not defined", __func__, 1);
 
    dewa->check_columns = check_columns;
    return 0;
}
 
 
l_ok
dewarpaSetMaxDistance(L_DEWARPA  *dewa,
                      l_int32     maxdist)
{
    if (!dewa)
        return ERROR_INT("dewa not defined", __func__, 1);
 
    dewa->maxdist = maxdist;
    dewa->modelsready = 0;  /* force validation */
    return 0;
}
 
 
/*----------------------------------------------------------------------*
 *                       Dewarp serialized I/O                          *
 *----------------------------------------------------------------------*/
L_DEWARP *
dewarpRead(const char  *filename)
{
FILE      *fp;
L_DEWARP  *dew;
 
    if (!filename)
        return (L_DEWARP *)ERROR_PTR("filename not defined", __func__, NULL);
    if ((fp = fopenReadStream(filename)) == NULL)
        return (L_DEWARP *)ERROR_PTR_1("stream not opened",
                                       filename, __func__, NULL);
 
    if ((dew = dewarpReadStream(fp)) == NULL) {
        fclose(fp);
        return (L_DEWARP *)ERROR_PTR_1("dew not read",
                                       filename, __func__, NULL);
    }
 
    fclose(fp);
    return dew;
}
 
 
L_DEWARP *
dewarpReadStream(FILE  *fp)
{
l_int32    version, sampling, redfactor, minlines, pageno, hasref, refpage;
l_int32    w, h, nx, ny, vdispar, hdispar, nlines;
l_int32    mincurv, maxcurv, leftslope, rightslope, leftcurv, rightcurv;
L_DEWARP  *dew;
FPIX      *fpixv = NULL, *fpixh = NULL;
 
    if (!fp)
        return (L_DEWARP *)ERROR_PTR("stream not defined", __func__, NULL);
 
    if (fscanf(fp, "\nDewarp Version %d\n", &version) != 1)
        return (L_DEWARP *)ERROR_PTR("not a dewarp file", __func__, NULL);
    if (version != DEWARP_VERSION_NUMBER)
        return (L_DEWARP *)ERROR_PTR("invalid dewarp version", __func__, NULL);
    if (fscanf(fp, "pageno = %d\n", &pageno) != 1)
        return (L_DEWARP *)ERROR_PTR("read fail for pageno", __func__, NULL);
    if (fscanf(fp, "hasref = %d, refpage = %d\n", &hasref, &refpage) != 2)
        return (L_DEWARP *)ERROR_PTR("read fail for hasref, refpage",
                                     __func__, NULL);
    if (fscanf(fp, "sampling = %d, redfactor = %d\n", &sampling, &redfactor)
               != 2)
        return (L_DEWARP *)ERROR_PTR("read fail for sampling/redfactor",
                                     __func__, NULL);
    if (fscanf(fp, "nlines = %d, minlines = %d\n", &nlines, &minlines) != 2)
        return (L_DEWARP *)ERROR_PTR("read fail for nlines/minlines",
                                     __func__, NULL);
    if (fscanf(fp, "w = %d, h = %d\n", &w, &h) != 2)
        return (L_DEWARP *)ERROR_PTR("read fail for w, h", __func__, NULL);
    if (fscanf(fp, "nx = %d, ny = %d\n", &nx, &ny) != 2)
        return (L_DEWARP *)ERROR_PTR("read fail for nx, ny", __func__, NULL);
    if (fscanf(fp, "vert_dispar = %d, horiz_dispar = %d\n", &vdispar, &hdispar)
               != 2)
        return (L_DEWARP *)ERROR_PTR("read fail for flags", __func__, NULL);
    if (vdispar) {
        if (fscanf(fp, "min line curvature = %d, max line curvature = %d\n",
                   &mincurv, &maxcurv) != 2)
            return (L_DEWARP *)ERROR_PTR("read fail for mincurv & maxcurv",
                                         __func__, NULL);
    }
    if (hdispar) {
        if (fscanf(fp, "left edge slope = %d, right edge slope = %d\n",
                   &leftslope, &rightslope) != 2)
            return (L_DEWARP *)ERROR_PTR("read fail for leftslope & rightslope",
                                         __func__, NULL);
        if (fscanf(fp, "left edge curvature = %d, right edge curvature = %d\n",
                   &leftcurv, &rightcurv) != 2)
            return (L_DEWARP *)ERROR_PTR("read fail for leftcurv & rightcurv",
                                         __func__, NULL);
    }
    if (vdispar) {
        if ((fpixv = fpixReadStream(fp)) == NULL)
            return (L_DEWARP *)ERROR_PTR("read fail for vdispar",
                                         __func__, NULL);
    }
    if (hdispar) {
        if ((fpixh = fpixReadStream(fp)) == NULL)
            return (L_DEWARP *)ERROR_PTR("read fail for hdispar",
                                         __func__, NULL);
    }
    getc(fp);
 
    dew = (L_DEWARP *)LEPT_CALLOC(1, sizeof(L_DEWARP));
    dew->w = w;
    dew->h = h;
    dew->pageno = pageno;
    dew->sampling = sampling;
    dew->redfactor = redfactor;
    dew->minlines = minlines;
    dew->nlines = nlines;
    dew->hasref = hasref;
    dew->refpage = refpage;
    if (hasref == 0)  /* any dew without a ref has an actual model */
        dew->vsuccess = 1;
    dew->nx = nx;
    dew->ny = ny;
    if (vdispar) {
        dew->mincurv = mincurv;
        dew->maxcurv = maxcurv;
        dew->vsuccess = 1;
        dew->sampvdispar = fpixv;
    }
    if (hdispar) {
        dew->leftslope = leftslope;
        dew->rightslope = rightslope;
        dew->leftcurv = leftcurv;
        dew->rightcurv = rightcurv;
        dew->hsuccess = 1;
        dew->samphdispar = fpixh;
    }
 
    return dew;
}
 
 
L_DEWARP  *
dewarpReadMem(const l_uint8  *data,
              size_t          size)
{
FILE      *fp;
L_DEWARP  *dew;
 
    if (!data)
        return (L_DEWARP *)ERROR_PTR("data not defined", __func__, NULL);
    if ((fp = fopenReadFromMemory(data, size)) == NULL)
        return (L_DEWARP *)ERROR_PTR("stream not opened", __func__, NULL);
 
    dew = dewarpReadStream(fp);
    fclose(fp);
    if (!dew) L_ERROR("dew not read\n", __func__);
    return dew;
}
 
 
l_ok
dewarpWrite(const char  *filename,
            L_DEWARP    *dew)
{
l_int32  ret;
FILE    *fp;
 
    if (!filename)
        return ERROR_INT("filename not defined", __func__, 1);
    if (!dew)
        return ERROR_INT("dew not defined", __func__, 1);
 
    if ((fp = fopenWriteStream(filename, "wb")) == NULL)
        return ERROR_INT_1("stream not opened", filename, __func__, 1);
    ret = dewarpWriteStream(fp, dew);
    fclose(fp);
    if (ret)
        return ERROR_INT_1("dew not written to stream", filename, __func__, 1);
    return 0;
}
 
 
l_ok
dewarpWriteStream(FILE      *fp,
                  L_DEWARP  *dew)
{
l_int32  vdispar, hdispar;
 
    if (!fp)
        return ERROR_INT("stream not defined", __func__, 1);
    if (!dew)
        return ERROR_INT("dew not defined", __func__, 1);
 
    fprintf(fp, "\nDewarp Version %d\n", DEWARP_VERSION_NUMBER);
    fprintf(fp, "pageno = %d\n", dew->pageno);
    fprintf(fp, "hasref = %d, refpage = %d\n", dew->hasref, dew->refpage);
    fprintf(fp, "sampling = %d, redfactor = %d\n",
            dew->sampling, dew->redfactor);
    fprintf(fp, "nlines = %d, minlines = %d\n", dew->nlines, dew->minlines);
    fprintf(fp, "w = %d, h = %d\n", dew->w, dew->h);
    fprintf(fp, "nx = %d, ny = %d\n", dew->nx, dew->ny);
    vdispar = (dew->sampvdispar) ? 1 : 0;
    hdispar = (dew->samphdispar) ? 1 : 0;
    fprintf(fp, "vert_dispar = %d, horiz_dispar = %d\n", vdispar, hdispar);
    if (vdispar)
        fprintf(fp, "min line curvature = %d, max line curvature = %d\n",
                dew->mincurv, dew->maxcurv);
    if (hdispar) {
        fprintf(fp, "left edge slope = %d, right edge slope = %d\n",
                dew->leftslope, dew->rightslope);
        fprintf(fp, "left edge curvature = %d, right edge curvature = %d\n",
                dew->leftcurv, dew->rightcurv);
    }
    if (vdispar) fpixWriteStream(fp, dew->sampvdispar);
    if (hdispar) fpixWriteStream(fp, dew->samphdispar);
    fprintf(fp, "\n");
 
    if (!vdispar)
        L_WARNING("no disparity arrays!\n", __func__);
    return 0;
}
 
 
l_ok
dewarpWriteMem(l_uint8  **pdata,
               size_t    *psize,
               L_DEWARP  *dew)
{
l_int32  ret;
FILE    *fp;
 
    if (pdata) *pdata = NULL;
    if (psize) *psize = 0;
    if (!pdata)
        return ERROR_INT("&data not defined", __func__, 1);
    if (!psize)
        return ERROR_INT("&size not defined", __func__, 1);
    if (!dew)
        return ERROR_INT("dew not defined", __func__, 1);
 
#if HAVE_FMEMOPEN
    if ((fp = open_memstream((char **)pdata, psize)) == NULL)
        return ERROR_INT("stream not opened", __func__, 1);
    ret = dewarpWriteStream(fp, dew);
    fputc('\0', fp);
    fclose(fp);
    if (*psize > 0) *psize = *psize - 1;
#else
    L_INFO("no fmemopen API --> work-around: write to temp file\n", __func__);
  #ifdef _WIN32
    if ((fp = fopenWriteWinTempfile()) == NULL)
        return ERROR_INT("tmpfile stream not opened", __func__, 1);
  #else
    if ((fp = tmpfile()) == NULL)
        return ERROR_INT("tmpfile stream not opened", __func__, 1);
  #endif  /* _WIN32 */
    ret = dewarpWriteStream(fp, dew);
    rewind(fp);
    *pdata = l_binaryReadStream(fp, psize);
    fclose(fp);
#endif  /* HAVE_FMEMOPEN */
    return ret;
}
 
 
/*----------------------------------------------------------------------*
 *                       Dewarpa serialized I/O                          *
 *----------------------------------------------------------------------*/
L_DEWARPA *
dewarpaRead(const char  *filename)
{
FILE       *fp;
L_DEWARPA  *dewa;
 
    if (!filename)
        return (L_DEWARPA *)ERROR_PTR("filename not defined", __func__, NULL);
    if ((fp = fopenReadStream(filename)) == NULL)
        return (L_DEWARPA *)ERROR_PTR_1("stream not opened",
                                        filename, __func__, NULL);
 
    if ((dewa = dewarpaReadStream(fp)) == NULL) {
        fclose(fp);
        return (L_DEWARPA *)ERROR_PTR_1("dewa not read",
                                        filename, __func__, NULL);
    }
 
    fclose(fp);
    return dewa;
}
 
 
L_DEWARPA *
dewarpaReadStream(FILE  *fp)
{
l_int32     i, version, ndewarp, maxpage;
l_int32     sampling, redfactor, minlines, maxdist, useboth;
l_int32     max_linecurv, min_diff_linecurv, max_diff_linecurv;
l_int32     max_edgeslope, max_edgecurv, max_diff_edgecurv;
L_DEWARP   *dew;
L_DEWARPA  *dewa;
NUMA       *namodels;
 
    if (!fp)
        return (L_DEWARPA *)ERROR_PTR("stream not defined", __func__, NULL);
 
    if (fscanf(fp, "\nDewarpa Version %d\n", &version) != 1)
        return (L_DEWARPA *)ERROR_PTR("not a dewarpa file", __func__, NULL);
    if (version != DEWARP_VERSION_NUMBER)
        return (L_DEWARPA *)ERROR_PTR("invalid dewarp version", __func__, NULL);
 
    if (fscanf(fp, "ndewarp = %d, maxpage = %d\n", &ndewarp, &maxpage) != 2)
        return (L_DEWARPA *)ERROR_PTR("read fail for maxpage+", __func__, NULL);
    if (ndewarp < 1)
        return (L_DEWARPA *)ERROR_PTR("pages not >= 1", __func__, NULL);
    if (ndewarp > MaxPtrArraySize)
        return (L_DEWARPA *)ERROR_PTR("too many pages", __func__, NULL);
    if (fscanf(fp,
               "sampling = %d, redfactor = %d, minlines = %d, maxdist = %d\n",
               &sampling, &redfactor, &minlines, &maxdist) != 4)
        return (L_DEWARPA *)ERROR_PTR("read fail for 4 params", __func__, NULL);
    if (fscanf(fp,
          "max_linecurv = %d, min_diff_linecurv = %d, max_diff_linecurv = %d\n",
          &max_linecurv, &min_diff_linecurv, &max_diff_linecurv) != 3)
        return (L_DEWARPA *)ERROR_PTR("read fail for linecurv", __func__, NULL);
    if (fscanf(fp,
              "max_edgeslope = %d, max_edgecurv = %d, max_diff_edgecurv = %d\n",
               &max_edgeslope, &max_edgecurv, &max_diff_edgecurv) != 3)
        return (L_DEWARPA *)ERROR_PTR("read fail for edgecurv", __func__, NULL);
    if (fscanf(fp, "fullmodel = %d\n", &useboth) != 1)
        return (L_DEWARPA *)ERROR_PTR("read fail for useboth", __func__, NULL);
 
    dewa = dewarpaCreate(maxpage + 1, sampling, redfactor, minlines, maxdist);
    dewa->maxpage = maxpage;
    dewa->max_linecurv = max_linecurv;
    dewa->min_diff_linecurv = min_diff_linecurv;
    dewa->max_diff_linecurv = max_diff_linecurv;
    dewa->max_edgeslope = max_edgeslope;
    dewa->max_edgecurv = max_edgecurv;
    dewa->max_diff_edgecurv = max_diff_edgecurv;
    dewa->useboth = useboth;
    namodels = numaCreate(ndewarp);
    dewa->namodels = namodels;
    for (i = 0; i < ndewarp; i++) {
        if ((dew = dewarpReadStream(fp)) == NULL) {
            L_ERROR("read fail for dew[%d]\n", __func__, i);
            dewarpaDestroy(&dewa);
            return NULL;
        }
        dewarpaInsertDewarp(dewa, dew);
        numaAddNumber(namodels, dew->pageno);
    }
 
        /* Validate the models and insert reference models */
    dewarpaInsertRefModels(dewa, 0, 0);
    return dewa;
}
 
 
L_DEWARPA  *
dewarpaReadMem(const l_uint8  *data,
               size_t          size)
{
FILE       *fp;
L_DEWARPA  *dewa;
 
    if (!data)
        return (L_DEWARPA *)ERROR_PTR("data not defined", __func__, NULL);
    if ((fp = fopenReadFromMemory(data, size)) == NULL)
        return (L_DEWARPA *)ERROR_PTR("stream not opened", __func__, NULL);
 
    dewa = dewarpaReadStream(fp);
    fclose(fp);
    if (!dewa) L_ERROR("dewa not read\n", __func__);
    return dewa;
}
 
 
l_ok
dewarpaWrite(const char  *filename,
             L_DEWARPA   *dewa)
{
l_int32  ret;
FILE    *fp;
 
    if (!filename)
        return ERROR_INT("filename not defined", __func__, 1);
    if (!dewa)
        return ERROR_INT("dewa not defined", __func__, 1);
 
    if ((fp = fopenWriteStream(filename, "wb")) == NULL)
        return ERROR_INT_1("stream not opened", filename, __func__, 1);
    ret = dewarpaWriteStream(fp, dewa);
    fclose(fp);
    if (ret)
        return ERROR_INT_1("dewa not written to stream", filename, __func__, 1);
    return 0;
}
 
 
l_ok
dewarpaWriteStream(FILE       *fp,
                   L_DEWARPA  *dewa)
{
l_int32  ndewarp, i, pageno;
 
    if (!fp)
        return ERROR_INT("stream not defined", __func__, 1);
    if (!dewa)
        return ERROR_INT("dewa not defined", __func__, 1);
 
        /* Generate the list of page numbers for which a model exists.
         * Note that no attempt is made to determine if the model is
         * valid, because that determination is associated with
         * using the model to remove the warping, which typically
         * can happen later, after all the models have been built. */
    dewarpaListPages(dewa);
    if (!dewa->namodels)
        return ERROR_INT("dewa->namodels not made", __func__, 1);
    ndewarp = numaGetCount(dewa->namodels);  /*  with actual page models */
 
    fprintf(fp, "\nDewarpa Version %d\n", DEWARP_VERSION_NUMBER);
    fprintf(fp, "ndewarp = %d, maxpage = %d\n", ndewarp, dewa->maxpage);
    fprintf(fp, "sampling = %d, redfactor = %d, minlines = %d, maxdist = %d\n",
            dewa->sampling, dewa->redfactor, dewa->minlines, dewa->maxdist);
    fprintf(fp,
        "max_linecurv = %d, min_diff_linecurv = %d, max_diff_linecurv = %d\n",
        dewa->max_linecurv, dewa->min_diff_linecurv, dewa->max_diff_linecurv);
    fprintf(fp,
            "max_edgeslope = %d, max_edgecurv = %d, max_diff_edgecurv = %d\n",
            dewa->max_edgeslope, dewa->max_edgecurv, dewa->max_diff_edgecurv);
    fprintf(fp, "fullmodel = %d\n", dewa->useboth);
    for (i = 0; i < ndewarp; i++) {
        numaGetIValue(dewa->namodels, i, &pageno);
        dewarpWriteStream(fp, dewarpaGetDewarp(dewa, pageno));
    }
 
    return 0;
}
 
 
l_ok
dewarpaWriteMem(l_uint8   **pdata,
                size_t     *psize,
                L_DEWARPA  *dewa)
{
l_int32  ret;
FILE    *fp;
 
    if (pdata) *pdata = NULL;
    if (psize) *psize = 0;
    if (!pdata)
        return ERROR_INT("&data not defined", __func__, 1);
    if (!psize)
        return ERROR_INT("&size not defined", __func__, 1);
    if (!dewa)
        return ERROR_INT("dewa not defined", __func__, 1);
 
#if HAVE_FMEMOPEN
    if ((fp = open_memstream((char **)pdata, psize)) == NULL)
        return ERROR_INT("stream not opened", __func__, 1);
    ret = dewarpaWriteStream(fp, dewa);
    fputc('\0', fp);
    fclose(fp);
    if (*psize > 0) *psize = *psize - 1;
#else
    L_INFO("no fmemopen API --> work-around: write to temp file\n", __func__);
  #ifdef _WIN32
    if ((fp = fopenWriteWinTempfile()) == NULL)
        return ERROR_INT("tmpfile stream not opened", __func__, 1);
  #else
    if ((fp = tmpfile()) == NULL)
        return ERROR_INT("tmpfile stream not opened", __func__, 1);
  #endif  /* _WIN32 */
    ret = dewarpaWriteStream(fp, dewa);
    rewind(fp);
    *pdata = l_binaryReadStream(fp, psize);
    fclose(fp);
#endif  /* HAVE_FMEMOPEN */
    return ret;
}