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tiffdither.c
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tiffdither.c
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/* $Id: tiffdither.c,v 1.12 2010-03-10 18:56:50 bfriesen Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
* Copyright (c) 1991-1997 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the names of
* Sam Leffler and Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Sam Leffler and Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include "tif_config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef NEED_LIBPORT
# include "libport.h"
#endif
#include "tiffio.h"
#define streq(a,b) (strcmp(a,b) == 0)
#define strneq(a,b,n) (strncmp(a,b,n) == 0)
#define CopyField(tag, v) \
if (TIFFGetField(in, tag, &v)) TIFFSetField(out, tag, v)
uint32 imagewidth;
uint32 imagelength;
int threshold = 128;
static void usage(void);
/*
* Floyd-Steinberg error propragation with threshold.
* This code is stolen from tiffmedian.
*/
static void
fsdither(TIFF* in, TIFF* out)
{
unsigned char *outline, *inputline, *inptr;
short *thisline, *nextline, *tmpptr;
register unsigned char *outptr;
register short *thisptr, *nextptr;
register uint32 i, j;
uint32 imax, jmax;
int lastline, lastpixel;
int bit;
tsize_t outlinesize;
imax = imagelength - 1;
jmax = imagewidth - 1;
inputline = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(in));
thisline = (short *)_TIFFmalloc(imagewidth * sizeof (short));
nextline = (short *)_TIFFmalloc(imagewidth * sizeof (short));
outlinesize = TIFFScanlineSize(out);
outline = (unsigned char *) _TIFFmalloc(outlinesize);
/*
* Get first line
*/
if (TIFFReadScanline(in, inputline, 0, 0) <= 0)
goto skip_on_error;
inptr = inputline;
nextptr = nextline;
for (j = 0; j < imagewidth; ++j)
*nextptr++ = *inptr++;
for (i = 1; i < imagelength; ++i) {
tmpptr = thisline;
thisline = nextline;
nextline = tmpptr;
lastline = (i == imax);
if (TIFFReadScanline(in, inputline, i, 0) <= 0)
break;
inptr = inputline;
nextptr = nextline;
for (j = 0; j < imagewidth; ++j)
*nextptr++ = *inptr++;
thisptr = thisline;
nextptr = nextline;
_TIFFmemset(outptr = outline, 0, outlinesize);
bit = 0x80;
for (j = 0; j < imagewidth; ++j) {
register int v;
lastpixel = (j == jmax);
v = *thisptr++;
if (v < 0)
v = 0;
else if (v > 255)
v = 255;
if (v > threshold) {
*outptr |= bit;
v -= 255;
}
bit >>= 1;
if (bit == 0) {
outptr++;
bit = 0x80;
}
if (!lastpixel)
thisptr[0] += v * 7 / 16;
if (!lastline) {
if (j != 0)
nextptr[-1] += v * 3 / 16;
*nextptr++ += v * 5 / 16;
if (!lastpixel)
nextptr[0] += v / 16;
}
}
if (TIFFWriteScanline(out, outline, i-1, 0) < 0)
break;
}
skip_on_error:
_TIFFfree(inputline);
_TIFFfree(thisline);
_TIFFfree(nextline);
_TIFFfree(outline);
}
static uint16 compression = COMPRESSION_PACKBITS;
static uint16 predictor = 0;
static uint32 group3options = 0;
static void
processG3Options(char* cp)
{
if ((cp = strchr(cp, ':'))) {
do {
cp++;
if (strneq(cp, "1d", 2))
group3options &= ~GROUP3OPT_2DENCODING;
else if (strneq(cp, "2d", 2))
group3options |= GROUP3OPT_2DENCODING;
else if (strneq(cp, "fill", 4))
group3options |= GROUP3OPT_FILLBITS;
else
usage();
} while ((cp = strchr(cp, ':')));
}
}
static int
processCompressOptions(char* opt)
{
if (streq(opt, "none"))
compression = COMPRESSION_NONE;
else if (streq(opt, "packbits"))
compression = COMPRESSION_PACKBITS;
else if (strneq(opt, "g3", 2)) {
processG3Options(opt);
compression = COMPRESSION_CCITTFAX3;
} else if (streq(opt, "g4"))
compression = COMPRESSION_CCITTFAX4;
else if (strneq(opt, "lzw", 3)) {
char* cp = strchr(opt, ':');
if (cp)
predictor = atoi(cp+1);
compression = COMPRESSION_LZW;
} else if (strneq(opt, "zip", 3)) {
char* cp = strchr(opt, ':');
if (cp)
predictor = atoi(cp+1);
compression = COMPRESSION_DEFLATE;
} else
return (0);
return (1);
}
int
main(int argc, char* argv[])
{
TIFF *in, *out;
uint16 samplesperpixel, bitspersample = 1, shortv;
float floatv;
char thing[1024];
uint32 rowsperstrip = (uint32) -1;
uint16 fillorder = 0;
int c;
extern int optind;
extern char *optarg;
while ((c = getopt(argc, argv, "c:f:r:t:")) != -1)
switch (c) {
case 'c': /* compression scheme */
if (!processCompressOptions(optarg))
usage();
break;
case 'f': /* fill order */
if (streq(optarg, "lsb2msb"))
fillorder = FILLORDER_LSB2MSB;
else if (streq(optarg, "msb2lsb"))
fillorder = FILLORDER_MSB2LSB;
else
usage();
break;
case 'r': /* rows/strip */
rowsperstrip = atoi(optarg);
break;
case 't':
threshold = atoi(optarg);
if (threshold < 0)
threshold = 0;
else if (threshold > 255)
threshold = 255;
break;
case '?':
usage();
/*NOTREACHED*/
}
if (argc - optind < 2)
usage();
in = TIFFOpen(argv[optind], "r");
if (in == NULL)
return (-1);
TIFFGetField(in, TIFFTAG_SAMPLESPERPIXEL, &samplesperpixel);
if (samplesperpixel != 1) {
fprintf(stderr, "%s: Not a b&w image.\n", argv[0]);
return (-1);
}
TIFFGetField(in, TIFFTAG_BITSPERSAMPLE, &bitspersample);
if (bitspersample != 8) {
fprintf(stderr,
" %s: Sorry, only handle 8-bit samples.\n", argv[0]);
return (-1);
}
out = TIFFOpen(argv[optind+1], "w");
if (out == NULL)
return (-1);
CopyField(TIFFTAG_IMAGEWIDTH, imagewidth);
TIFFGetField(in, TIFFTAG_IMAGELENGTH, &imagelength);
TIFFSetField(out, TIFFTAG_IMAGELENGTH, imagelength-1);
TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 1);
TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, 1);
TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField(out, TIFFTAG_COMPRESSION, compression);
if (fillorder)
TIFFSetField(out, TIFFTAG_FILLORDER, fillorder);
else
CopyField(TIFFTAG_FILLORDER, shortv);
sprintf(thing, "Dithered B&W version of %s", argv[optind]);
TIFFSetField(out, TIFFTAG_IMAGEDESCRIPTION, thing);
CopyField(TIFFTAG_PHOTOMETRIC, shortv);
CopyField(TIFFTAG_ORIENTATION, shortv);
CopyField(TIFFTAG_XRESOLUTION, floatv);
CopyField(TIFFTAG_YRESOLUTION, floatv);
CopyField(TIFFTAG_RESOLUTIONUNIT, shortv);
rowsperstrip = TIFFDefaultStripSize(out, rowsperstrip);
TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
switch (compression) {
case COMPRESSION_CCITTFAX3:
TIFFSetField(out, TIFFTAG_GROUP3OPTIONS, group3options);
break;
case COMPRESSION_LZW:
case COMPRESSION_DEFLATE:
if (predictor)
TIFFSetField(out, TIFFTAG_PREDICTOR, predictor);
break;
}
fsdither(in, out);
TIFFClose(in);
TIFFClose(out);
return (0);
}
char* stuff[] = {
"usage: tiffdither [options] input.tif output.tif",
"where options are:",
" -r # make each strip have no more than # rows",
" -f lsb2msb force lsb-to-msb FillOrder for output",
" -f msb2lsb force msb-to-lsb FillOrder for output",
" -c lzw[:opts] compress output with Lempel-Ziv & Welch encoding",
" -c zip[:opts] compress output with deflate encoding",
" -c packbits compress output with packbits encoding",
" -c g3[:opts] compress output with CCITT Group 3 encoding",
" -c g4 compress output with CCITT Group 4 encoding",
" -c none use no compression algorithm on output",
"",
"Group 3 options:",
" 1d use default CCITT Group 3 1D-encoding",
" 2d use optional CCITT Group 3 2D-encoding",
" fill byte-align EOL codes",
"For example, -c g3:2d:fill to get G3-2D-encoded data with byte-aligned EOLs",
"",
"LZW and deflate options:",
" # set predictor value",
"For example, -c lzw:2 to get LZW-encoded data with horizontal differencing",
NULL
};
static void
usage(void)
{
char buf[BUFSIZ];
int i;
setbuf(stderr, buf);
fprintf(stderr, "%s\n\n", TIFFGetVersion());
for (i = 0; stuff[i] != NULL; i++)
fprintf(stderr, "%s\n", stuff[i]);
exit(-1);
}
/* vim: set ts=8 sts=8 sw=8 noet: */
/*
* Local Variables:
* mode: c
* c-basic-offset: 8
* fill-column: 78
* End:
*/