/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1992 Sam Leffler
 * Copyright (c) 1991, 1992 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.
 */

#ifndef _TIFF_
#define	_TIFF_
/*
 * Tag Image File Format (TIFF)
 *
 * Based on Rev 6.0 from:
 *    Developer's Desk
 *    Aldus Corporation
 *    411 First Ave. South
 *    Suite 200
 *    Seattle, WA  98104
 *    206-622-5500
 */
#define	TIFF_VERSION	42

#define	TIFF_BIGENDIAN		0x4d4d
#define	TIFF_LITTLEENDIAN	0x4949

typedef	struct {
	unsigned short tiff_magic;	/* magic number (defines byte order) */
	unsigned short tiff_version;	/* TIFF version number */
	unsigned long  tiff_diroff;	/* byte offset to first directory */
} TIFFHeader;

/*
 * TIFF Image File Directories are comprised of
 * a table of field descriptors of the form shown
 * below.  The table is sorted in ascending order
 * by tag.  The values associated with each entry
 * are disjoint and may appear anywhere in the file
 * (so long as they are placed on a word boundary).
 *
 * If the value is 4 bytes or less, then it is placed
 * in the offset field to save space.  If the value
 * is less than 4 bytes, it is left-justified in the
 * offset field.
 */
typedef	struct {
	unsigned short tdir_tag;	/* see below */
	unsigned short tdir_type;	/* data type; see below */
	unsigned long  tdir_count;	/* number of items; length in spec */
	unsigned long  tdir_offset;	/* byte offset to field data */
} TIFFDirEntry;

/*
 * NB: In the comments below,
 *  - items marked with a + are obsoleted by revision 5.0,
 *  - items marked with a ! are introduced in revision 6.0.
 *  - items marked with a $ are obsoleted by revision 6.0.
 */

/*
 * Tag data type information.
 *
 * Note: RATIONALs are the ratio of two 32-bit integer values.
 */
typedef	enum {
	TIFF_NOTYPE	= 0,	/* placeholder */
	TIFF_BYTE	= 1,	/* 8-bit unsigned integer */
	TIFF_ASCII	= 2,	/* 8-bit bytes w/ last byte null */
	TIFF_SHORT	= 3,	/* 16-bit unsigned integer */
	TIFF_LONG	= 4,	/* 32-bit unsigned integer */
	TIFF_RATIONAL	= 5,	/* 64-bit unsigned fraction */
	TIFF_SBYTE	= 6,	/* !8-bit signed integer */
	TIFF_UNDEFINED	= 7,	/* !8-bit untyped data */
	TIFF_SSHORT	= 8,	/* !16-bit signed integer */
	TIFF_SLONG	= 9,	/* !32-bit signed integer */
	TIFF_SRATIONAL	= 10,	/* !64-bit signed fraction */
	TIFF_FLOAT	= 11,	/* !32-bit IEEE floating point */
	TIFF_DOUBLE	= 12	/* !64-bit IEEE floating point */
} TIFFDataType;

/*
 * TIFF Tag Definitions.
 */
#define	TIFFTAG_SUBFILETYPE		254	/* subfile data descriptor */
#define	    FILETYPE_REDUCEDIMAGE	0x1	/* reduced resolution version */
#define	    FILETYPE_PAGE		0x2	/* one page of many */
#define	    FILETYPE_MASK		0x4	/* transparency mask */
#define	TIFFTAG_OSUBFILETYPE		255	/* +kind of data in subfile */
#define	    OFILETYPE_IMAGE		1	/* full resolution image data */
#define	    OFILETYPE_REDUCEDIMAGE	2	/* reduced size image data */
#define	    OFILETYPE_PAGE		3	/* one page of many */
#define	TIFFTAG_IMAGEWIDTH		256	/* image width in pixels */
#define	TIFFTAG_IMAGELENGTH		257	/* image height in pixels */
#define	TIFFTAG_BITSPERSAMPLE		258	/* bits per channel (sample) */
#define	TIFFTAG_COMPRESSION		259	/* data compression technique */
#define	    COMPRESSION_NONE		1	/* dump mode */
#define	    COMPRESSION_CCITTRLE	2	/* CCITT modified Huffman RLE */
#define	    COMPRESSION_CCITTFAX3	3	/* CCITT Group 3 fax encoding */
#define	    COMPRESSION_CCITTFAX4	4	/* CCITT Group 4 fax encoding */
#define	    COMPRESSION_LZW		5	/* Lempel-Ziv  & Welch */
#define	    COMPRESSION_JPEG		6	/* !JPEG compression */
#define	    COMPRESSION_NEXT		32766	/* NeXT 2-bit RLE */
#define	    COMPRESSION_CCITTRLEW	32771	/* #1 w/ word alignment */
#define	    COMPRESSION_PACKBITS	32773	/* Macintosh RLE */
#define	    COMPRESSION_THUNDERSCAN	32809	/* ThunderScan RLE */
#define	TIFFTAG_PHOTOMETRIC		262	/* photometric interpretation */
#define	    PHOTOMETRIC_MINISWHITE	0	/* min value is white */
#define	    PHOTOMETRIC_MINISBLACK	1	/* min value is black */
#define	    PHOTOMETRIC_RGB		2	/* RGB color model */
#define	    PHOTOMETRIC_PALETTE		3	/* color map indexed */
#define	    PHOTOMETRIC_MASK		4	/* $holdout mask */
#define	    PHOTOMETRIC_SEPARATED	5	/* !color separations */
#define	    PHOTOMETRIC_YCBCR		6	/* !CCIR 601 */
#define	    PHOTOMETRIC_CIELAB		8	/* !1976 CIE L*a*b* */
#define	TIFFTAG_THRESHHOLDING		263	/* +thresholding used on data */
#define	    THRESHHOLD_BILEVEL		1	/* b&w art scan */
#define	    THRESHHOLD_HALFTONE		2	/* or dithered scan */
#define	    THRESHHOLD_ERRORDIFFUSE	3	/* usually floyd-steinberg */
#define	TIFFTAG_CELLWIDTH		264	/* +dithering matrix width */
#define	TIFFTAG_CELLLENGTH		265	/* +dithering matrix height */
#define	TIFFTAG_FILLORDER		266	/* data order within a byte */
#define	    FILLORDER_MSB2LSB		1	/* most significant -> least */
#define	    FILLORDER_LSB2MSB		2	/* least significant -> most */
#define	TIFFTAG_DOCUMENTNAME		269	/* name of doc. image is from */
#define	TIFFTAG_IMAGEDESCRIPTION	270	/* info about image */
#define	TIFFTAG_MAKE			271	/* scanner manufacturer name */
#define	TIFFTAG_MODEL			272	/* scanner model name/number */
#define	TIFFTAG_STRIPOFFSETS		273	/* offsets to data strips */
#define	TIFFTAG_ORIENTATION		274	/* +image orientation */
#define	    ORIENTATION_TOPLEFT		1	/* row 0 top, col 0 lhs */
#define	    ORIENTATION_TOPRIGHT	2	/* row 0 top, col 0 rhs */
#define	    ORIENTATION_BOTRIGHT	3	/* row 0 bottom, col 0 rhs */
#define	    ORIENTATION_BOTLEFT		4	/* row 0 bottom, col 0 lhs */
#define	    ORIENTATION_LEFTTOP		5	/* row 0 lhs, col 0 top */
#define	    ORIENTATION_RIGHTTOP	6	/* row 0 rhs, col 0 top */
#define	    ORIENTATION_RIGHTBOT	7	/* row 0 rhs, col 0 bottom */
#define	    ORIENTATION_LEFTBOT		8	/* row 0 lhs, col 0 bottom */
#define	TIFFTAG_SAMPLESPERPIXEL		277	/* samples per pixel */
#define	TIFFTAG_ROWSPERSTRIP		278	/* rows per strip of data */
#define	TIFFTAG_STRIPBYTECOUNTS		279	/* bytes counts for strips */
#define	TIFFTAG_MINSAMPLEVALUE		280	/* +minimum sample value */
#define	TIFFTAG_MAXSAMPLEVALUE		281	/* +maximum sample value */
#define	TIFFTAG_XRESOLUTION		282	/* pixels/resolution in x */
#define	TIFFTAG_YRESOLUTION		283	/* pixels/resolution in y */
#define	TIFFTAG_PLANARCONFIG		284	/* storage organization */
#define	    PLANARCONFIG_CONTIG		1	/* single image plane */
#define	    PLANARCONFIG_SEPARATE	2	/* separate planes of data */
#define	TIFFTAG_PAGENAME		285	/* page name image is from */
#define	TIFFTAG_XPOSITION		286	/* x page offset of image lhs */
#define	TIFFTAG_YPOSITION		287	/* y page offset of image lhs */
#define	TIFFTAG_FREEOFFSETS		288	/* +byte offset to free block */
#define	TIFFTAG_FREEBYTECOUNTS		289	/* +sizes of free blocks */
#define	TIFFTAG_GRAYRESPONSEUNIT	290	/* $gray scale curve accuracy */
#define	    GRAYRESPONSEUNIT_10S	1	/* tenths of a unit */
#define	    GRAYRESPONSEUNIT_100S	2	/* hundredths of a unit */
#define	    GRAYRESPONSEUNIT_1000S	3	/* thousandths of a unit */
#define	    GRAYRESPONSEUNIT_10000S	4	/* ten-thousandths of a unit */
#define	    GRAYRESPONSEUNIT_100000S	5	/* hundred-thousandths */
#define	TIFFTAG_GRAYRESPONSECURVE	291	/* $gray scale response curve */
#define	TIFFTAG_GROUP3OPTIONS		292	/* 32 flag bits */
#define	    GROUP3OPT_2DENCODING	0x1	/* 2-dimensional coding */
#define	    GROUP3OPT_UNCOMPRESSED	0x2	/* data not compressed */
#define	    GROUP3OPT_FILLBITS		0x4	/* fill to byte boundary */
#define	TIFFTAG_GROUP4OPTIONS		293	/* 32 flag bits */
#define	    GROUP4OPT_UNCOMPRESSED	0x2	/* data not compressed */
#define	TIFFTAG_RESOLUTIONUNIT		296	/* units of resolutions */
#define	    RESUNIT_NONE		1	/* no meaningful units */
#define	    RESUNIT_INCH		2	/* english */
#define	    RESUNIT_CENTIMETER		3	/* metric */
#define	TIFFTAG_PAGENUMBER		297	/* page numbers of multi-page */
#define	TIFFTAG_COLORRESPONSEUNIT	300	/* $color curve accuracy */
#define	    COLORRESPONSEUNIT_10S	1	/* tenths of a unit */
#define	    COLORRESPONSEUNIT_100S	2	/* hundredths of a unit */
#define	    COLORRESPONSEUNIT_1000S	3	/* thousandths of a unit */
#define	    COLORRESPONSEUNIT_10000S	4	/* ten-thousandths of a unit */
#define	    COLORRESPONSEUNIT_100000S	5	/* hundred-thousandths */
#define	TIFFTAG_TRANSFERFUNCTION	301	/* !colorimetry info */
#define	TIFFTAG_SOFTWARE		305	/* name & release */
#define	TIFFTAG_DATETIME		306	/* creation date and time */
#define	TIFFTAG_ARTIST			315	/* creator of image */
#define	TIFFTAG_HOSTCOMPUTER		316	/* machine where created */
#define	TIFFTAG_PREDICTOR		317	/* prediction scheme w/ LZW */
#define	TIFFTAG_WHITEPOINT		318	/* image white point */
#define	TIFFTAG_PRIMARYCHROMATICITIES	319	/* !primary chromaticities */
#define	TIFFTAG_COLORMAP		320	/* RGB map for pallette image */
#define	TIFFTAG_HALFTONEHINTS		321	/* !highlight+shadow info */
#define	TIFFTAG_TILEWIDTH		322	/* !rows/data tile */
#define	TIFFTAG_TILELENGTH		323	/* !cols/data tile */
#define TIFFTAG_TILEOFFSETS		324	/* !offsets to data tiles */
#define TIFFTAG_TILEBYTECOUNTS		325	/* !byte counts for tiles */
#define	TIFFTAG_BADFAXLINES		326	/* lines w/ wrong pixel count */
#define	TIFFTAG_CLEANFAXDATA		327	/* regenerated line info */
#define	    CLEANFAXDATA_CLEAN		0	/* no errors detected */
#define	    CLEANFAXDATA_REGENERATED	1	/* receiver regenerated lines */
#define	    CLEANFAXDATA_UNCLEAN	2	/* uncorrected errors exist */
#define	TIFFTAG_CONSECUTIVEBADFAXLINES	328	/* max consecutive bad lines */
#define	TIFFTAG_INKSET			332	/* !inks in separated image */
#define	    INKSET_CMYK			1	/* !cyan-magenta-yellow-black */
#define	TIFFTAG_INKNAMES		333	/* !ascii names of inks */
#define	TIFFTAG_DOTRANGE		336	/* !0% and 100% dot codes */
#define	TIFFTAG_TARGETPRINTER		337	/* !separation target */
#define	TIFFTAG_EXTRASAMPLES		338	/* !info about extra samples */
#define	    EXTRASAMPLE_UNSPECIFIED	0	/* !unspecified data */
#define	    EXTRASAMPLE_ASSOCALPHA	1	/* !associated alpha data */
#define	    EXTRASAMPLE_UNASSALPHA	2	/* !unassociated alpha data */
#define	TIFFTAG_SAMPLEFORMAT		339	/* !data sample format */
#define	    SAMPLEFORMAT_UINT		1	/* !unsigned integer data */
#define	    SAMPLEFORMAT_INT		2	/* !signed integer data */
#define	    SAMPLEFORMAT_IEEEFP		3	/* !IEEE floating point data */
#define	    SAMPLEFORMAT_VOID		4	/* !untyped data */
#define	TIFFTAG_SMINSAMPLEVALUE		340	/* !variable MinSampleValue */
#define	TIFFTAG_SMAXSAMPLEVALUE		341	/* !variable MaxSampleValue */
#define	TIFFTAG_JPEGPROC		512	/* !JPEG processing algorithm */
#define	    JPEGPROC_BASELINE		1	/* !baseline sequential */
#define	    JPEGPROC_LOSSLESS		14	/* !Huffman coded lossless */
#define	TIFFTAG_JPEGIFOFFSET		513	/* !pointer to SOI marker */
#define	TIFFTAG_JPEGIFBYTECOUNT		514	/* !JFIF stream length */
#define	TIFFTAG_JPEGRESTARTINTERVAL	515	/* !restart interval length */
#define	TIFFTAG_JPEGLOSSLESSPREDICTORS	517	/* !lossless proc predictor */
#define	TIFFTAG_JPEGPOINTTRANSFORM	518	/* !lossless point transform */
#define	TIFFTAG_JPEGQTABLES		519	/* !Q matrice offsets */
#define	TIFFTAG_JPEGDCTABLES		520	/* !DCT table offsets */
#define	TIFFTAG_JPEGACTABLES		521	/* !AC coefficient offsets */
#define	TIFFTAG_YCBCRCOEFFICIENTS	529	/* !RGB -> YCbCr transform */
#define	TIFFTAG_YCBCRSUBSAMPLING	530	/* !YCbCr subsampling factors */
#define	TIFFTAG_YCBCRPOSITIONING	531	/* !subsample positioning */
#define	    YCBCRPOSITION_CENTERED	1	/* !as in PostScript Level 2 */
#define	    YCBCRPOSITION_COSITED	2	/* !as in CCIR 601-1 */
#define	TIFFTAG_REFERENCEBLACKWHITE	532	/* !colorimetry info */
/* tags 32995-32999 are private tags registered to SGI */
#define	TIFFTAG_MATTEING		32995	/* $use ExtraSamples */
#define	TIFFTAG_DATATYPE		32996	/* $use SampleFormat */
#define	TIFFTAG_IMAGEDEPTH		32997	/* z depth of image */
#define	TIFFTAG_TILEDEPTH		32998	/* z depth/data tile */
#endif /* _TIFF_ */
