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-rwxr-xr-xtiff/tools/tiffdither.c334
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diff --git a/tiff/tools/tiffdither.c b/tiff/tools/tiffdither.c
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+/* $Id: tiffdither.c,v 1.14 2013-05-02 14:44:29 tgl 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);
+ snprintf(thing, sizeof(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",
+" -t # set the threshold value for dithering (default 128)",
+" -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:
+ */