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/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: scfx.h,v 1.6 2005/06/03 20:03:54 ray Exp $ */
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/* CCITTFax filter state definition */
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/* Requires strimpl.h */
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#ifndef scfx_INCLUDED
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# define scfx_INCLUDED
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#include "shc.h"
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/* Common state */
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#define stream_CF_state_common\
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stream_hc_state_common;\
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/* The client sets the following before initialization. */\
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bool Uncompressed;\
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int K;\
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bool EndOfLine;\
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bool EncodedByteAlign;\
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int Columns;\
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int Rows;\
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bool EndOfBlock;\
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bool BlackIs1;\
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int DamagedRowsBeforeError; /* (Decode only) */\
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/*bool FirstBitLowOrder;*/ /* in stream_hc_state_common */\
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int DecodedByteAlign;\
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/* The init procedure sets the following. */\
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uint raster;\
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byte *lbuf; /* current scan line buffer */\
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/* (only if decoding or 2-D encoding) */\
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byte *lprev; /* previous scan line buffer (only if 2-D) */\
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/* The following are updated dynamically. */\
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int k_left /* number of next rows to encode in 2-D */\
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/* (only if K > 0) */
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typedef struct stream_CF_state_s {
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stream_CF_state_common;
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} stream_CF_state;
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/* Define common default parameter setting. */
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#define s_CF_set_defaults_inline(ss)\
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((ss)->Uncompressed = false,\
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(ss)->K = 0,\
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(ss)->EndOfLine = false,\
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(ss)->EncodedByteAlign = false,\
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(ss)->Columns = 1728,\
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(ss)->Rows = 0,\
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(ss)->EndOfBlock = true,\
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(ss)->BlackIs1 = false,\
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/* Added by Adobe since the Red Book */\
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(ss)->DamagedRowsBeforeError = 0, /* always set, for s_CF_get_params */\
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(ss)->FirstBitLowOrder = false,\
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/* Added by us */\
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(ss)->DecodedByteAlign = 1,\
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/* Clear pointers */\
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(ss)->lbuf = 0, (ss)->lprev = 0)
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/* CCITTFaxEncode */
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typedef struct stream_CFE_state_s {
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stream_CF_state_common;
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/* The init procedure sets the following. */
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int max_code_bytes; /* max # of bytes for an encoded line */
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byte *lcode; /* buffer for encoded output line */
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/* The following change dynamically. */
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int read_count; /* # of bytes to copy into lbuf */
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int write_count; /* # of bytes to copy out of lcode */
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int code_bytes; /* # of occupied bytes in lcode */
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} stream_CFE_state;
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#define private_st_CFE_state() /* in scfe.c */\
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gs_private_st_ptrs3(st_CFE_state, stream_CFE_state, "CCITTFaxEncode state",\
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cfe_enum_ptrs, cfe_reloc_ptrs, lbuf, lprev, lcode)
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#define s_CFE_set_defaults_inline(ss)\
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(s_CF_set_defaults_inline(ss), (ss)->lcode = 0)
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extern const stream_template s_CFE_template;
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/* CCITTFaxDecode */
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typedef struct stream_CFD_state_s {
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stream_CF_state_common;
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int cbit; /* bits left to fill in current decoded */
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/* byte at lbuf[wpos] (0..7) */
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int rows_left; /* number of rows left */
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int row; /* current row, first is 0 */
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int rpos; /* rptr for copying lbuf to client */
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int wpos; /* rlimit/wptr for filling lbuf or */
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/* copying to client */
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int eol_count; /* number of EOLs seen so far */
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byte invert; /* current value of 'white' */
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/* for 2-D decoding */
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int run_color; /* -1 if processing white run, */
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/* 0 if between runs but white is next, */
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/* 1 if between runs and black is next, */
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/* 2 if processing black run */
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int damaged_rows; /* # of consecutive damaged rows preceding */
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/* the current row */
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bool skipping_damage; /* true if skipping a damaged row looking */
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/* for EOL */
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/* The following are not used yet. */
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int uncomp_run; /* non-0 iff we are in an uncompressed */
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/* run straddling a scan line (-1 if white, */
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/* 1 if black) */
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int uncomp_left; /* # of bits left in the run */
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int uncomp_exit; /* non-0 iff this is an exit run */
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/* (-1 if next run white, 1 if black) */
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} stream_CFD_state;
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#define private_st_CFD_state() /* in scfd.c */\
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gs_private_st_ptrs2(st_CFD_state, stream_CFD_state, "CCITTFaxDecode state",\
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cfd_enum_ptrs, cfd_reloc_ptrs, lbuf, lprev)
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#define s_CFD_set_defaults_inline(ss)\
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s_CF_set_defaults_inline(ss)
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extern const stream_template s_CFD_template;
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#endif /* scfx_INCLUDED */
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