/* $Id: thumbnail.c,v 1.21 2015-06-21 01:09:10 bfriesen Exp $ */

/*

 * Copyright (c) 1994-1997 Sam Leffler

 * Copyright (c) 1994-1997 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>

#include <math.h>

#ifdef HAVE_UNISTD_H

# include <unistd.h>

#endif

#ifdef NEED_LIBPORT

# include "libport.h"

#endif

#include "tiffio.h"

#ifndef HAVE_GETOPT

extern int getopt(int, char**, char*);

#endif

#define	streq(a,b)	(strcmp(a,b) == 0)

#ifndef TIFFhowmany8

# define TIFFhowmany8(x) (((x)&0x07)?((uint32)(x)>>3)+1:(uint32)(x)>>3)

#endif

typedef enum {

    EXP50,

    EXP60,

    EXP70,

    EXP80,

    EXP90,

    EXP,

    LINEAR

} Contrast;

static	uint32 tnw = 216;		/* thumbnail width */

static	uint32 tnh = 274;		/* thumbnail height */

static	Contrast contrast = LINEAR;	/* current contrast */

static	uint8* thumbnail;

static	int cpIFD(TIFF*, TIFF*);

static	int generateThumbnail(TIFF*, TIFF*);

static	void initScale();

static	void usage(void);

#if !HAVE_DECL_OPTARG

extern	char* optarg;

extern	int optind;

#endif

int

main(int argc, char* argv[])

{

    TIFF* in;

    TIFF* out;

    int c;

    while ((c = getopt(argc, argv, "w:h:c:")) != -1) {

	switch (c) {

	case 'w':	tnw = strtoul(optarg, NULL, 0); break;

	case 'h':	tnh = strtoul(optarg, NULL, 0); break;

	case 'c':	contrast = streq(optarg, "exp50") ? EXP50 :

				   streq(optarg, "exp60") ? EXP60 :

				   streq(optarg, "exp70") ? EXP70 :

				   streq(optarg, "exp80") ? EXP80 :

				   streq(optarg, "exp90") ? EXP90 :

				   streq(optarg, "exp")   ? EXP :

				   streq(optarg, "linear")? LINEAR :

							    EXP;

			break;

	default:	usage();

	}

    }

    if (argc-optind != 2)

	usage();

    out = TIFFOpen(argv[optind+1], "w");

    if (out == NULL)

	return 2;

    in = TIFFOpen(argv[optind], "r");

    if( in == NULL )

        return 2;

    thumbnail = (uint8*) _TIFFmalloc(tnw * tnh);

    if (!thumbnail) {

	    TIFFError(TIFFFileName(in),

		      "Can't allocate space for thumbnail buffer.");

	    return 1;

    }

    if (in != NULL) {

	initScale();

	do {

	    if (!generateThumbnail(in, out))

		goto bad;

	    if (!cpIFD(in, out) || !TIFFWriteDirectory(out))

		goto bad;

	} while (TIFFReadDirectory(in));

	(void) TIFFClose(in);

    }

    (void) TIFFClose(out);

    return 0;

bad:

    (void) TIFFClose(out);

    return 1;

}

#define	CopyField(tag, v) \

    if (TIFFGetField(in, tag, &v)) TIFFSetField(out, tag, v)

#define	CopyField2(tag, v1, v2) \

    if (TIFFGetField(in, tag, &v1, &v2)) TIFFSetField(out, tag, v1, v2)

#define	CopyField3(tag, v1, v2, v3) \

    if (TIFFGetField(in, tag, &v1, &v2, &v3)) TIFFSetField(out, tag, v1, v2, v3)

#define	CopyField4(tag, v1, v2, v3, v4) \

    if (TIFFGetField(in, tag, &v1, &v2, &v3, &v4)) TIFFSetField(out, tag, v1, v2, v3, v4)

static void

cpTag(TIFF* in, TIFF* out, uint16 tag, uint16 count, TIFFDataType type)

{

	switch (type) {

	case TIFF_SHORT:

		if (count == 1) {

			uint16 shortv;

			CopyField(tag, shortv);

		} else if (count == 2) {

			uint16 shortv1, shortv2;

			CopyField2(tag, shortv1, shortv2);

		} else if (count == 4) {

			uint16 *tr, *tg, *tb, *ta;

			CopyField4(tag, tr, tg, tb, ta);

		} else if (count == (uint16) -1) {

			uint16 shortv1;

			uint16* shortav;

			CopyField2(tag, shortv1, shortav);

		}

		break;

	case TIFF_LONG:

		{ uint32 longv;

		  CopyField(tag, longv);

		}

		break;

	case TIFF_LONG8:

		{ uint64 longv8;

		  CopyField(tag, longv8);

		}

		break;

	case TIFF_SLONG8:

		{ int64 longv8;

		  CopyField(tag, longv8);

		}

		break;

	case TIFF_RATIONAL:

		if (count == 1) {

			float floatv;

			CopyField(tag, floatv);

		} else if (count == (uint16) -1) {

			float* floatav;

			CopyField(tag, floatav);

		}

		break;

	case TIFF_ASCII:

		{ char* stringv;

		  CopyField(tag, stringv);

		}

		break;

	case TIFF_DOUBLE:

		if (count == 1) {

			double doublev;

			CopyField(tag, doublev);

		} else if (count == (uint16) -1) {

			double* doubleav;

			CopyField(tag, doubleav);

		}

		break;

	case TIFF_IFD8:

		{ toff_t ifd8;

		  CopyField(tag, ifd8);

		}

		break;          default:

                TIFFError(TIFFFileName(in),

                          "Data type %d is not supported, tag %d skipped.",

                          tag, type);

	}

}

#undef CopyField4

#undef CopyField3

#undef CopyField2

#undef CopyField

static struct cpTag {

    uint16	tag;

    uint16	count;

    TIFFDataType type;

} tags[] = {

    { TIFFTAG_IMAGEWIDTH,		1, TIFF_LONG },

    { TIFFTAG_IMAGELENGTH,		1, TIFF_LONG },

    { TIFFTAG_BITSPERSAMPLE,		1, TIFF_SHORT },

    { TIFFTAG_COMPRESSION,		1, TIFF_SHORT },

    { TIFFTAG_FILLORDER,		1, TIFF_SHORT },

    { TIFFTAG_SAMPLESPERPIXEL,		1, TIFF_SHORT },

    { TIFFTAG_ROWSPERSTRIP,		1, TIFF_LONG },

    { TIFFTAG_PLANARCONFIG,		1, TIFF_SHORT },

    { TIFFTAG_GROUP3OPTIONS,		1, TIFF_LONG },

    { TIFFTAG_SUBFILETYPE,		1, TIFF_LONG },

    { TIFFTAG_PHOTOMETRIC,		1, TIFF_SHORT },

    { TIFFTAG_THRESHHOLDING,		1, TIFF_SHORT },

    { TIFFTAG_DOCUMENTNAME,		1, TIFF_ASCII },

    { TIFFTAG_IMAGEDESCRIPTION,		1, TIFF_ASCII },

    { TIFFTAG_MAKE,			1, TIFF_ASCII },

    { TIFFTAG_MODEL,			1, TIFF_ASCII },

    { TIFFTAG_ORIENTATION,		1, TIFF_SHORT },

    { TIFFTAG_MINSAMPLEVALUE,		1, TIFF_SHORT },

    { TIFFTAG_MAXSAMPLEVALUE,		1, TIFF_SHORT },

    { TIFFTAG_XRESOLUTION,		1, TIFF_RATIONAL },

    { TIFFTAG_YRESOLUTION,		1, TIFF_RATIONAL },

    { TIFFTAG_PAGENAME,			1, TIFF_ASCII },

    { TIFFTAG_XPOSITION,		1, TIFF_RATIONAL },

    { TIFFTAG_YPOSITION,		1, TIFF_RATIONAL },

    { TIFFTAG_GROUP4OPTIONS,		1, TIFF_LONG },

    { TIFFTAG_RESOLUTIONUNIT,		1, TIFF_SHORT },

    { TIFFTAG_PAGENUMBER,		2, TIFF_SHORT },

    { TIFFTAG_SOFTWARE,			1, TIFF_ASCII },

    { TIFFTAG_DATETIME,			1, TIFF_ASCII },

    { TIFFTAG_ARTIST,			1, TIFF_ASCII },

    { TIFFTAG_HOSTCOMPUTER,		1, TIFF_ASCII },

    { TIFFTAG_WHITEPOINT,		2, TIFF_RATIONAL },

    { TIFFTAG_PRIMARYCHROMATICITIES,	(uint16) -1,TIFF_RATIONAL },

    { TIFFTAG_HALFTONEHINTS,		2, TIFF_SHORT },

    { TIFFTAG_BADFAXLINES,		1, TIFF_LONG },

    { TIFFTAG_CLEANFAXDATA,		1, TIFF_SHORT },

    { TIFFTAG_CONSECUTIVEBADFAXLINES,	1, TIFF_LONG },

    { TIFFTAG_INKSET,			1, TIFF_SHORT },

    /*{ TIFFTAG_INKNAMES,			1, TIFF_ASCII },*/ /* Needs much more complicated logic. See tiffcp */

    { TIFFTAG_DOTRANGE,			2, TIFF_SHORT },

    { TIFFTAG_TARGETPRINTER,		1, TIFF_ASCII },

    { TIFFTAG_SAMPLEFORMAT,		1, TIFF_SHORT },

    { TIFFTAG_YCBCRCOEFFICIENTS,	(uint16) -1,TIFF_RATIONAL },

    { TIFFTAG_YCBCRSUBSAMPLING,		2, TIFF_SHORT },

    { TIFFTAG_YCBCRPOSITIONING,		1, TIFF_SHORT },

    { TIFFTAG_REFERENCEBLACKWHITE,	(uint16) -1,TIFF_RATIONAL },

    { TIFFTAG_EXTRASAMPLES,		(uint16) -1, TIFF_SHORT },

};

#define	NTAGS	(sizeof (tags) / sizeof (tags[0]))

static void

cpTags(TIFF* in, TIFF* out)

{

    struct cpTag *p;

    for (p = tags; p < &tags[NTAGS]; p++)

	{

		/* Horrible: but TIFFGetField() expects 2 arguments to be passed */

		/* if we request a tag that is defined in a codec, but that codec */

		/* isn't used */

		if( p->tag == TIFFTAG_GROUP3OPTIONS )

		{

			uint16 compression;

			if( !TIFFGetField(in, TIFFTAG_COMPRESSION, &compression) ||

				compression != COMPRESSION_CCITTFAX3 )

				continue;

		}

		if( p->tag == TIFFTAG_GROUP4OPTIONS )

		{

			uint16 compression;

			if( !TIFFGetField(in, TIFFTAG_COMPRESSION, &compression) ||

				compression != COMPRESSION_CCITTFAX4 )

				continue;

		}

		cpTag(in, out, p->tag, p->count, p->type);

	}

}

#undef NTAGS

static int

cpStrips(TIFF* in, TIFF* out)

{

    tsize_t bufsize  = TIFFStripSize(in);

    unsigned char *buf = (unsigned char *)_TIFFmalloc(bufsize);

    if (buf) {

	tstrip_t s, ns = TIFFNumberOfStrips(in);

	uint64 *bytecounts;

	TIFFGetField(in, TIFFTAG_STRIPBYTECOUNTS, &bytecounts);

	for (s = 0; s < ns; s++) {

	  if (bytecounts[s] > (uint64) bufsize) {

		buf = (unsigned char *)_TIFFrealloc(buf, (tmsize_t)bytecounts[s]);

		if (!buf)

		    goto bad;

		bufsize = (tmsize_t)bytecounts[s];

	    }

	    if (TIFFReadRawStrip(in, s, buf, (tmsize_t)bytecounts[s]) < 0 ||

		TIFFWriteRawStrip(out, s, buf, (tmsize_t)bytecounts[s]) < 0) {

		_TIFFfree(buf);

		return 0;

	    }

	}

	_TIFFfree(buf);

	return 1;

    }

bad:

	TIFFError(TIFFFileName(in),

		  "Can't allocate space for strip buffer.");

	return 0;

}

static int

cpTiles(TIFF* in, TIFF* out)

{

    tsize_t bufsize = TIFFTileSize(in);

    unsigned char *buf = (unsigned char *)_TIFFmalloc(bufsize);

    if (buf) {

	ttile_t t, nt = TIFFNumberOfTiles(in);

	uint64 *bytecounts;

	TIFFGetField(in, TIFFTAG_TILEBYTECOUNTS, &bytecounts);

	for (t = 0; t < nt; t++) {

	    if (bytecounts[t] > (uint64) bufsize) {

		buf = (unsigned char *)_TIFFrealloc(buf, (tmsize_t)bytecounts[t]);

		if (!buf)

		    goto bad;

		bufsize = (tmsize_t)bytecounts[t];

	    }

	    if (TIFFReadRawTile(in, t, buf, (tmsize_t)bytecounts[t]) < 0 ||

		TIFFWriteRawTile(out, t, buf, (tmsize_t)bytecounts[t]) < 0) {

		_TIFFfree(buf);

		return 0;

	    }

	}

	_TIFFfree(buf);

	return 1;

    }

bad:

    TIFFError(TIFFFileName(in),

		  "Can't allocate space for tile buffer.");

	return (0);

}

static int

cpIFD(TIFF* in, TIFF* out)

{

    cpTags(in, out);

    if (TIFFIsTiled(in)) {

	if (!cpTiles(in, out))

	    return (0);

    } else {

	if (!cpStrips(in, out))

	    return (0);

    }

    return (1);

}

static	uint16	photometric;		/* current photometric of raster */

static	uint16	filterWidth;		/* filter width in pixels */

static	uint32	stepSrcWidth;		/* src image stepping width */

static	uint32	stepDstWidth;		/* dest stepping width */

static	uint8* src0;			/* horizontal bit stepping (start) */

static	uint8* src1;			/* horizontal bit stepping (middle) */

static	uint8* src2;			/* horizontal bit stepping (end) */

static	uint32* rowoff;			/* row offset for stepping */

static	uint8 cmap[256];		/* colormap indexes */

static	uint8 bits[256];		/* count of bits set */

static void

setupBitsTables()

{

    int i;

    for (i = 0; i < 256; i++) {

	int n = 0;

	if (i&0x01) n++;

	if (i&0x02) n++;

	if (i&0x04) n++;

	if (i&0x08) n++;

	if (i&0x10) n++;

	if (i&0x20) n++;

	if (i&0x40) n++;

	if (i&0x80) n++;

	bits[i] = n;

    }

}

static int clamp(float v, int low, int high)

    { return (v < low ? low : v > high ? high : (int)v); }

#ifndef M_E

#define M_E		2.7182818284590452354

#endif

static void

expFill(float pct[], uint32 p, uint32 n)

{

    uint32 i;

    uint32 c = (p * n) / 100;

    for (i = 1; i < c; i++)

	pct[i] = (float) (1-exp(i/((double)(n-1)))/ M_E);

    for (; i < n; i++)

	pct[i] = 0.;

}

static void

setupCmap()

{

    float pct[256];			/* known to be large enough */

    uint32 i;

    pct[0] = 1;				/* force white */

    switch (contrast) {

    case EXP50: expFill(pct, 50, 256); break;

    case EXP60:	expFill(pct, 60, 256); break;

    case EXP70:	expFill(pct, 70, 256); break;

    case EXP80:	expFill(pct, 80, 256); break;

    case EXP90:	expFill(pct, 90, 256); break;

    case EXP:	expFill(pct, 100, 256); break;

    case LINEAR:

	for (i = 1; i < 256; i++)

	    pct[i] = 1-((float)i)/(256-1);

	break;

    }

    switch (photometric) {

    case PHOTOMETRIC_MINISWHITE:

	for (i = 0; i < 256; i++)

	    cmap[i] = clamp(255*pct[(256-1)-i], 0, 255);

	break;

    case PHOTOMETRIC_MINISBLACK:

	for (i = 0; i < 256; i++)

	    cmap[i] = clamp(255*pct[i], 0, 255);

	break;

    }

}

static void

initScale()

{

    src0 = (uint8*) _TIFFmalloc(sizeof (uint8) * tnw);

    src1 = (uint8*) _TIFFmalloc(sizeof (uint8) * tnw);

    src2 = (uint8*) _TIFFmalloc(sizeof (uint8) * tnw);

    rowoff = (uint32*) _TIFFmalloc(sizeof (uint32) * tnw);

    filterWidth = 0;

    stepDstWidth = stepSrcWidth = 0;

    setupBitsTables();

}

/*

 * Calculate the horizontal accumulation parameteres

 * according to the widths of the src and dst images.

 */

static void

setupStepTables(uint32 sw)

{

    if (stepSrcWidth != sw || stepDstWidth != tnw) {

	int step = sw;

	int limit = tnw;

	int err = 0;

	uint32 sx = 0;

	uint32 x;

	int fw;

	uint8 b;

	for (x = 0; x < tnw; x++) {

	    uint32 sx0 = sx;

	    err += step;

	    while (err >= limit) {

		err -= limit;

		sx++;

	    }

	    rowoff[x] = sx0 >> 3;

	    fw = sx - sx0;		/* width */

	    b = (fw < 8) ? 0xff<<(8-fw) : 0xff;

	    src0[x] = b >> (sx0&7;;

	    fw -= 8 - (sx0&7;;

	    if (fw < 0)

		fw = 0;

	    src1[x] = fw >> 3;

	    fw -= (fw>>3)<<3;

	    src2[x] = 0xff << (8-fw);

	}

	stepSrcWidth = sw;

	stepDstWidth = tnw;

    }

}

static void

setrow(uint8* row, uint32 nrows, const uint8* rows[])

{

    uint32 x;

    uint32 area = nrows * filterWidth;

    for (x = 0; x < tnw; x++) {

	uint32 mask0 = src0[x];

	uint32 fw = src1[x];

	uint32 mask1 = src1[x];

	uint32 off = rowoff[x];

	uint32 acc = 0;

	uint32 y, i;

	for (y = 0; y < nrows; y++) {

	    const uint8* src = rows[y] + off;

	    acc += bits[*src++ & mask0];

	    switch (fw) {

	    default:

		for (i = fw; i > 8; i--)

		    acc += bits[*src++];

		/* fall thru... */

	    case 8: acc += bits[*src++];

	    case 7: acc += bits[*src++];

	    case 6: acc += bits[*src++];

	    case 5: acc += bits[*src++];

	    case 4: acc += bits[*src++];

	    case 3: acc += bits[*src++];

	    case 2: acc += bits[*src++];

	    case 1: acc += bits[*src++];

	    case 0: break;

	    }

	    acc += bits[*src & mask1];

	}

	*row++ = cmap[(255*acc)/area];

    }

}

/*

 * Install the specified image.  The

 * image is resized to fit the display page using

 * a box filter.  The resultant pixels are mapped

 * with a user-selectable contrast curve.

 */

static void

setImage1(const uint8* br, uint32 rw, uint32 rh)

{

    int step = rh;

    int limit = tnh;

    int err = 0;

    int bpr = TIFFhowmany8(rw);

    int sy = 0;

    uint8* row = thumbnail;

    uint32 dy;

    for (dy = 0; dy < tnh; dy++) {

	const uint8* rows[256];

	uint32 nrows = 1;

	fprintf(stderr, "bpr=%d, sy=%d, bpr*sy=%d\n", bpr, sy, bpr*sy);

	rows[0] = br + bpr*sy;

	err += step;

	while (err >= limit) {

	    err -= limit;

	    sy++;

	    if (err >= limit)

		{

			/* We should perhaps error loudly, but I can't make sense of that */

			/* code... */

			if( nrows == 256 )

				break;

			rows[nrows++] = br + bpr*sy;

		}

	}

	setrow(row, nrows, rows);

	row += tnw;

    }

}

static void

setImage(const uint8* br, uint32 rw, uint32 rh)

{

    filterWidth = (uint16) ceil((double) rw / (double) tnw);

    setupStepTables(rw);

    setImage1(br, rw, rh);

}

static int

generateThumbnail(TIFF* in, TIFF* out)

{

    unsigned char* raster;

    unsigned char* rp;

    uint32 sw, sh, rps;

    uint16 bps, spp;

    tsize_t rowsize, rastersize;

    tstrip_t s, ns = TIFFNumberOfStrips(in);

    toff_t diroff[1];

    TIFFGetField(in, TIFFTAG_IMAGEWIDTH, &sw);

    TIFFGetField(in, TIFFTAG_IMAGELENGTH, &sh);

    TIFFGetFieldDefaulted(in, TIFFTAG_BITSPERSAMPLE, &bps;;

    TIFFGetFieldDefaulted(in, TIFFTAG_SAMPLESPERPIXEL, &spp;;

    TIFFGetFieldDefaulted(in, TIFFTAG_ROWSPERSTRIP, &rps;;

    if (spp != 1 || bps != 1)

	return 0;

    rowsize = TIFFScanlineSize(in);

    rastersize = sh * rowsize;

    fprintf(stderr, "rastersize=%u\n", (unsigned int)rastersize);

	/* +3 : add a few guard bytes since setrow() can read a bit */

	/* outside buffer */

    raster = (unsigned char*)_TIFFmalloc(rastersize+3);

    if (!raster) {

	    TIFFError(TIFFFileName(in),

		      "Can't allocate space for raster buffer.");

	    return 0;

    }

    raster[rastersize] = 0;

    raster[rastersize+1] = 0;

    raster[rastersize+2] = 0;

    rp = raster;

    for (s = 0; s < ns; s++) {

	(void) TIFFReadEncodedStrip(in, s, rp, -1);

	rp += rps * rowsize;

    }

    TIFFGetField(in, TIFFTAG_PHOTOMETRIC, &photometric);

    setupCmap();

    setImage(raster, sw, sh);

    _TIFFfree(raster);

    TIFFSetField(out, TIFFTAG_SUBFILETYPE, FILETYPE_REDUCEDIMAGE);

    TIFFSetField(out, TIFFTAG_IMAGEWIDTH, (uint32) tnw);

    TIFFSetField(out, TIFFTAG_IMAGELENGTH, (uint32) tnh);

    TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, (uint16) 8);

    TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, (uint16) 1);

    TIFFSetField(out, TIFFTAG_COMPRESSION, COMPRESSION_PACKBITS);

    TIFFSetField(out, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISWHITE);

    TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);

    TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);

    cpTag(in, out, TIFFTAG_SOFTWARE,		(uint16) -1, TIFF_ASCII);

    cpTag(in, out, TIFFTAG_IMAGEDESCRIPTION,	(uint16) -1, TIFF_ASCII);

    cpTag(in, out, TIFFTAG_DATETIME,		(uint16) -1, TIFF_ASCII);

    cpTag(in, out, TIFFTAG_HOSTCOMPUTER,	(uint16) -1, TIFF_ASCII);

    diroff[0] = 0UL;

    TIFFSetField(out, TIFFTAG_SUBIFD, 1, diroff);

    return (TIFFWriteEncodedStrip(out, 0, thumbnail, tnw*tnh) != -1 &&

            TIFFWriteDirectory(out) != -1);

}

char* stuff[] = {

"usage: thumbnail [options] input.tif output.tif",

"where options are:",

" -h #		specify thumbnail image height (default is 274)",

" -w #		specify thumbnail image width (default is 216)",

"",

" -c linear	use linear contrast curve",

" -c exp50	use 50% exponential contrast curve",

" -c exp60	use 60% exponential contrast curve",

" -c exp70	use 70% exponential contrast curve",

" -c exp80	use 80% exponential contrast curve",

" -c exp90	use 90% exponential contrast curve",

" -c exp		use pure exponential contrast curve",

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:

 */