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/*
This file is part of Page Layout Detection Tools.
This code is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This code 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this code; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <formats/tifffact.h>
#include <util/bitutil.h>
#include <tiff.h>
#include <tiffio.h>
namespace pagetools{
TiffFactory::TiffFactory(const char *path)
:path_(path){
}
CntPtr<BWImage>
TiffFactory::create(){
TIFF* tif = TIFFOpen(path_, "r");
if (tif) {
uint32 imagelength, imagewidth;
tdata_t buf;
uint32 row;
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &imagelength);
TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &imagewidth);
uint16 bpp, photometric, fillorder;
TIFFGetField(tif, TIFFTAG_BITSPERSAMPLE, &bpp);
if(bpp!=1){
return 0; // Not a monochrome image
}
TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &photometric);
TIFFGetField(tif, TIFFTAG_FILLORDER, &fillorder);
uint32 ssize=TIFFScanlineSize(tif);
CntPtr<BWImage> retval=CntPtr<BWImage>(new BWImage(imagewidth, imagelength, ssize));
unsigned char padmask=0xFF<<((imagewidth+7)%8);
uint8 *r;
for (row = 0; row < imagelength; row++){
buf=r=retval->scanline(row);
TIFFReadScanline(tif, buf, row);
unsigned int col;
if(photometric!= PHOTOMETRIC_MINISWHITE){
for(col=0; col<ssize; col++){
r[col]^=0xFF; // Invert the image
}
}
if(fillorder!= FILLORDER_MSB2LSB){
const unsigned char *inv=BitUtil::invbits();
for(col=0; col<ssize; col++){
r[col]=inv[r[col]]; // Change the bit order
}
}
r[ssize-1]&=padmask; // Zero trailing bits
}
TIFFGetFieldDefaulted(tif, TIFFTAG_FILLORDER, &fillorder);
retval->setBitorder((fillorder==FILLORDER_MSB2LSB) ? BWImage::MSB2LSB : BWImage::LSB2MSB);
TIFFClose(tif);
return retval;
}
return 0;
}
}//namespace pagetools
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