318 lines
8.5 KiB
C
318 lines
8.5 KiB
C
/* $Id: tiffdither.c,v 1.7 2004-07-24 19:05:57 dron Exp $ */
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/*
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* Copyright (c) 1988-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "tiffio.h"
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#define streq(a,b) (strcmp(a,b) == 0)
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#define strneq(a,b,n) (strncmp(a,b,n) == 0)
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#define CopyField(tag, v) \
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if (TIFFGetField(in, tag, &v)) TIFFSetField(out, tag, v)
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uint32 imagewidth;
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uint32 imagelength;
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int threshold = 128;
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static void usage(void);
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/*
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* Floyd-Steinberg error propragation with threshold.
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* This code is stolen from tiffmedian.
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*/
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static void
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fsdither(TIFF* in, TIFF* out)
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{
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unsigned char *outline, *inputline, *inptr;
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short *thisline, *nextline, *tmpptr;
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register unsigned char *outptr;
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register short *thisptr, *nextptr;
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register uint32 i, j;
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uint32 imax, jmax;
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int lastline, lastpixel;
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int bit;
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tsize_t outlinesize;
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imax = imagelength - 1;
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jmax = imagewidth - 1;
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inputline = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(in));
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thisline = (short *)_TIFFmalloc(imagewidth * sizeof (short));
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nextline = (short *)_TIFFmalloc(imagewidth * sizeof (short));
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outlinesize = TIFFScanlineSize(out);
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outline = (unsigned char *) _TIFFmalloc(outlinesize);
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/*
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* Get first line
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*/
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if (TIFFReadScanline(in, inputline, 0, 0) <= 0)
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return;
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inptr = inputline;
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nextptr = nextline;
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for (j = 0; j < imagewidth; ++j)
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*nextptr++ = *inptr++;
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for (i = 1; i < imagelength; ++i) {
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tmpptr = thisline;
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thisline = nextline;
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nextline = tmpptr;
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lastline = (i == imax);
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if (TIFFReadScanline(in, inputline, i, 0) <= 0)
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break;
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inptr = inputline;
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nextptr = nextline;
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for (j = 0; j < imagewidth; ++j)
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*nextptr++ = *inptr++;
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thisptr = thisline;
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nextptr = nextline;
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_TIFFmemset(outptr = outline, 0, outlinesize);
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bit = 0x80;
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for (j = 0; j < imagewidth; ++j) {
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register int v;
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lastpixel = (j == jmax);
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v = *thisptr++;
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if (v < 0)
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v = 0;
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else if (v > 255)
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v = 255;
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if (v > threshold) {
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*outptr |= bit;
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v -= 255;
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}
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bit >>= 1;
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if (bit == 0) {
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outptr++;
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bit = 0x80;
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}
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if (!lastpixel)
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thisptr[0] += v * 7 / 16;
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if (!lastline) {
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if (j != 0)
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nextptr[-1] += v * 3 / 16;
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*nextptr++ += v * 5 / 16;
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if (!lastpixel)
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nextptr[0] += v / 16;
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}
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}
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if (TIFFWriteScanline(out, outline, i-1, 0) < 0)
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break;
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}
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_TIFFfree(inputline);
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_TIFFfree(thisline);
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_TIFFfree(nextline);
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_TIFFfree(outline);
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}
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static uint16 compression = COMPRESSION_PACKBITS;
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static uint16 predictor = 0;
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static uint32 group3options = 0;
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static void
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processG3Options(char* cp)
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{
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if (cp = strchr(cp, ':')) {
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do {
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cp++;
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if (strneq(cp, "1d", 2))
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group3options &= ~GROUP3OPT_2DENCODING;
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else if (strneq(cp, "2d", 2))
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group3options |= GROUP3OPT_2DENCODING;
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else if (strneq(cp, "fill", 4))
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group3options |= GROUP3OPT_FILLBITS;
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else
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usage();
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} while (cp = strchr(cp, ':'));
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}
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}
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static int
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processCompressOptions(char* opt)
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{
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if (streq(opt, "none"))
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compression = COMPRESSION_NONE;
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else if (streq(opt, "packbits"))
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compression = COMPRESSION_PACKBITS;
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else if (strneq(opt, "g3", 2)) {
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processG3Options(opt);
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compression = COMPRESSION_CCITTFAX3;
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} else if (streq(opt, "g4"))
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compression = COMPRESSION_CCITTFAX4;
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else if (strneq(opt, "lzw", 3)) {
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char* cp = strchr(opt, ':');
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if (cp)
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predictor = atoi(cp+1);
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compression = COMPRESSION_LZW;
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} else if (strneq(opt, "zip", 3)) {
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char* cp = strchr(opt, ':');
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if (cp)
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predictor = atoi(cp+1);
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compression = COMPRESSION_DEFLATE;
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} else
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return (0);
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return (1);
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}
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int
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main(int argc, char* argv[])
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{
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TIFF *in, *out;
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uint16 samplesperpixel, bitspersample = 1, shortv;
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float floatv;
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char thing[1024];
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uint32 rowsperstrip = (uint32) -1;
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int onestrip = 0;
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uint16 fillorder = 0;
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int c;
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extern int optind;
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extern char *optarg;
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while ((c = getopt(argc, argv, "c:f:r:t:")) != -1)
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switch (c) {
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case 'c': /* compression scheme */
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if (!processCompressOptions(optarg))
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usage();
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break;
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case 'f': /* fill order */
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if (streq(optarg, "lsb2msb"))
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fillorder = FILLORDER_LSB2MSB;
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else if (streq(optarg, "msb2lsb"))
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fillorder = FILLORDER_MSB2LSB;
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else
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usage();
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break;
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case 'r': /* rows/strip */
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rowsperstrip = atoi(optarg);
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onestrip = 0;
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break;
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case 't':
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threshold = atoi(optarg);
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if (threshold < 0)
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threshold = 0;
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else if (threshold > 255)
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threshold = 255;
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break;
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case '?':
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usage();
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/*NOTREACHED*/
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}
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if (argc - optind < 2)
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usage();
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in = TIFFOpen(argv[optind], "r");
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if (in == NULL)
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return (-1);
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TIFFGetField(in, TIFFTAG_SAMPLESPERPIXEL, &samplesperpixel);
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if (samplesperpixel != 1) {
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fprintf(stderr, "%s: Not a b&w image.\n", argv[0]);
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return (-1);
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}
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TIFFGetField(in, TIFFTAG_BITSPERSAMPLE, &bitspersample);
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if (bitspersample != 8) {
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fprintf(stderr,
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" %s: Sorry, only handle 8-bit samples.\n", argv[0]);
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return (-1);
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}
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out = TIFFOpen(argv[optind+1], "w");
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if (out == NULL)
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return (-1);
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CopyField(TIFFTAG_IMAGEWIDTH, imagewidth);
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TIFFGetField(in, TIFFTAG_IMAGELENGTH, &imagelength);
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TIFFSetField(out, TIFFTAG_IMAGELENGTH, imagelength-1);
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TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 1);
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TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, 1);
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TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
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TIFFSetField(out, TIFFTAG_COMPRESSION, compression);
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TIFFSetField(out, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISBLACK);
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if (fillorder)
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TIFFSetField(out, TIFFTAG_FILLORDER, fillorder);
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else
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CopyField(TIFFTAG_FILLORDER, shortv);
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sprintf(thing, "Dithered B&W version of %s", argv[optind]);
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TIFFSetField(out, TIFFTAG_IMAGEDESCRIPTION, thing);
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CopyField(TIFFTAG_ORIENTATION, shortv);
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CopyField(TIFFTAG_XRESOLUTION, floatv);
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CopyField(TIFFTAG_YRESOLUTION, floatv);
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CopyField(TIFFTAG_RESOLUTIONUNIT, shortv);
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if (onestrip)
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rowsperstrip = imagelength-1;
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else
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rowsperstrip = TIFFDefaultStripSize(out, rowsperstrip);
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TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
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switch (compression) {
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case COMPRESSION_CCITTFAX3:
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TIFFSetField(out, TIFFTAG_GROUP3OPTIONS, group3options);
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break;
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case COMPRESSION_LZW:
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case COMPRESSION_DEFLATE:
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if (predictor)
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TIFFSetField(out, TIFFTAG_PREDICTOR, predictor);
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break;
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}
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fsdither(in, out);
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TIFFClose(in);
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TIFFClose(out);
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return (0);
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}
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char* stuff[] = {
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"usage: tiffdither [options] input.tif output.tif",
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"where options are:",
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" -r # make each strip have no more than # rows",
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" -f lsb2msb force lsb-to-msb FillOrder for output",
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" -f msb2lsb force msb-to-lsb FillOrder for output",
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" -c lzw[:opts] compress output with Lempel-Ziv & Welch encoding",
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" -c zip[:opts] compress output with deflate encoding",
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" -c packbits compress output with packbits encoding",
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" -c g3[:opts] compress output with CCITT Group 3 encoding",
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" -c g4 compress output with CCITT Group 4 encoding",
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" -c none use no compression algorithm on output",
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"",
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"Group 3 options:",
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" 1d use default CCITT Group 3 1D-encoding",
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" 2d use optional CCITT Group 3 2D-encoding",
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" fill byte-align EOL codes",
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"For example, -c g3:2d:fill to get G3-2D-encoded data with byte-aligned EOLs",
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"",
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"LZW and deflate options:",
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" # set predictor value",
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"For example, -c lzw:2 to get LZW-encoded data with horizontal differencing",
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NULL
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};
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static void
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usage(void)
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{
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char buf[BUFSIZ];
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int i;
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setbuf(stderr, buf);
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fprintf(stderr, "%s\n\n", TIFFGetVersion());
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for (i = 0; stuff[i] != NULL; i++)
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fprintf(stderr, "%s\n", stuff[i]);
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exit(-1);
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}
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