home *** CD-ROM | disk | FTP | other *** search
- /* $Header: /usr/people/sam/tiff/libtiff/RCS/tif_fax3.h,v 1.8 92/02/10 19:06:37 sam Exp $ */
-
- /*
- * Copyright (c) 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 _FAX3_
- #define _FAX3_
- /*
- * CCITT Group 3 compression/decompression definitions.
- */
- #define FAX3_CLASSF TIFF_OPT0 /* use Class F protocol */
- /* the following are for use by Compression=2, 32771, and 4 (T.6) algorithms */
- #define FAX3_NOEOL TIFF_OPT1 /* no EOL code at end of row */
- #define FAX3_BYTEALIGN TIFF_OPT2 /* force byte alignment at end of row */
- #define FAX3_WORDALIGN TIFF_OPT3 /* force word alignment at end of row */
-
- /*
- * Compression+decompression state blocks are
- * derived from this ``base state'' block.
- */
- typedef struct {
- short data; /* current i/o byte */
- short bit; /* current i/o bit in byte */
- short white; /* value of the color ``white'' */
- u_long rowbytes; /* XXX maybe should be a long? */
- u_long rowpixels; /* XXX maybe should be a long? */
- enum { /* decoding/encoding mode */
- G3_1D, /* basic 1-d mode */
- G3_2D /* optional 2-d mode */
- } tag;
- #if defined(__STDC__) || defined(__EXTENDED__) || USE_CONST
- u_char const *bitmap; /* bit reversal table */
- #else
- u_char *bitmap; /* bit reversal table */
- #endif
- u_char *refline; /* reference line for 2d decoding */
- } Fax3BaseState;
-
- /* these routines are used for Group 4 (T.6) */
- #if USE_PROTOTYPES
- extern int Fax3Decode2DRow(TIFF*, u_char *, int);
- extern int Fax3Encode2DRow(TIFF*, u_char *, u_char *, int);
- extern void Fax3PutEOL(TIFF*);
- #else
- extern int Fax3Decode2DRow();
- extern int Fax3Encode2DRow();
- extern void Fax3PutEOL();
- #endif
-
- #define Fax3FlushBits(tif, sp) { \
- if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
- (void) TIFFFlushData1(tif); \
- *(tif)->tif_rawcp++ = (sp)->bitmap[(sp)->data]; \
- (tif)->tif_rawcc++; \
- (sp)->data = 0; \
- (sp)->bit = 8; \
- }
- #endif /* _FAX3_ */
-