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/*
** wleptonica.c Routines to interface w/leptonica lib
**
** Part of willus.com general purpose C code library.
**
** Copyright (C) 2022 http://willus.com
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** This program 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 Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
**
*/
#include <stdio.h>
#include "willus.h"
#ifdef HAVE_LEPTONICA_LIB
#include <leptonica/allheaders.h>
static void wlept_pix_from_bmp(PIX **pixptr,WILLUSBITMAP *bmp);
static void wlept_bmp_from_pix(WILLUSBITMAP *bmp,PIX *pix);
static void wlept_pix_from_bmp(PIX **pixptr,WILLUSBITMAP *bmp)
{
PIX *pix;
unsigned char *p;
int i,pixbpl;
(*pixptr)=pix=pixCreate(bmp->width,bmp->height,bmp->bpp<=8?8:32);
p=(unsigned char *)pixGetData(pix);
pixbpl=pixGetWpl(pix)*4;
for (i=0;i<bmp->height;i++)
{
unsigned char *s,*d;
int j;
s=bmp_rowptr_from_top(bmp,i);
d=&p[pixbpl*i];
if (bmp->bpp==8)
for (j=0;j<bmp->width;j++)
{
int j4,jmod;
j4=j>>2;
j4<<=2;
jmod=j&3;
p[pixbpl*i+j4+(3-jmod)]=s[j];
}
else
for (j=0;j<bmp->width;j++,s+=3,d+=4)
{
d[0]=0;
d[1]=s[2];
d[2]=s[1];
d[3]=s[0];
}
}
}
static void wlept_bmp_from_pix(WILLUSBITMAP *bmp,PIX *pix)
{
unsigned char *p;
int i,pixbpl;
bmp->width=pixGetWidth(pix);
bmp->height=pixGetHeight(pix);
bmp->bpp=pixGetDepth(pix)>8?24:8;
if (bmp->bpp==8)
for (i=0;i<256;i++)
bmp->red[i]=bmp->green[i]=bmp->blue[i]=i;
pixbpl=pixGetWpl(pix)*4;
p=(unsigned char *)pixGetData(pix);
for (i=0;i<bmp->height;i++)
{
unsigned char *s,*d;
int j;
d=bmp_rowptr_from_top(bmp,i);
s=&p[pixbpl*i];
if (bmp->bpp==8)
for (j=0;j<bmp->width;j++)
{
int j4,jmod;
j4=j>>2;
j4<<=2;
jmod=j&3;
d[j]=p[pixbpl*i+j4+(3-jmod)];
}
else
for (j=0;j<bmp->width;j++,s+=4,d+=3)
{
d[0]=s[3];
d[1]=s[2];
d[2]=s[1];
}
}
}
/* De-warp image using Leptonica algorithm--based on dewarptest1.c in Leptonica distro */
/* src2 -> dst2 using the same warpedness of src -> dst */
/* Fit order = 2, 3, or 4 */
void wlept_bmp_dewarp(WILLUSBITMAP *src,WILLUSBITMAP *bmp1,WILLUSBITMAP *bmp2,int wthresh,
int fit_order,char *debugfile)
{
PIX *pix,*pixg,*pixb;
L_DEWARPA *dewa;
L_DEWARP *dew1;
char *debug;
debug=(debugfile==NULL || debugfile[0]=='\0') ? NULL : debugfile;
wlept_pix_from_bmp(&pix,src);
if (pixGetDepth(pix)>8)
pixg=pixConvertRGBToGray(pix,.5,.3,.2);
else
pixg=pix;
pixb=pixThresholdToBinary(pixg,wthresh);
if (pixg!=pix)
pixDestroy(&pixg);
/*
printf("pixb=%dx%dx%d\n",pixb->w,pixb->h,pixb->d);
pixWrite("pixb.png",pixb,IFF_PNG);
*/
dewa=dewarpaCreate(2,50,1,10,30);
dewarpaUseBothArrays(dewa,1);
dew1=dewarpCreate(pixb,1);
pixDestroy(&pixb);
dewarpaInsertDewarp(dewa,dew1);
dewarpBuildPageModel(dew1,debug);
if (bmp1!=NULL)
{
PIX *pix2,*pix2d;
wlept_pix_from_bmp(&pix2,bmp1);
dewarpaApplyDisparity(dewa,1,pix2,-1,0,0,&pix2d,NULL);
wlept_bmp_from_pix(bmp1,pix2d);
pixDestroy(&pix2d);
pixDestroy(&pix2);
}
if (bmp2!=NULL && bmp2!=bmp1)
{
PIX *pix2,*pix2d;
wlept_pix_from_bmp(&pix2,bmp2);
dewarpaApplyDisparity(dewa,1,pix2,-1,0,0,&pix2d,NULL);
wlept_bmp_from_pix(bmp2,pix2d);
pixDestroy(&pix2d);
pixDestroy(&pix2);
}
dewarpaDestroy(&dewa); /* Includes dewarpDestroy of dew1 */
pixDestroy(&pix);
}
#endif /* HAVE_LEPTONICA_LIB */
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