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/* Copyright (C) 1994, 1995, 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: spdiffx.h,v 1.5 2004/03/13 22:31:19 ray Exp $ */
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/* Definitions for PixelDifference filters */
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/* Requires strimpl.h */
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#ifndef spdiffx_INCLUDED
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# define spdiffx_INCLUDED
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/*
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* Define the maximum value for Colors. This must be at least 4, but can
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* be arbitrarily large: the only cost is a larger stream state structure.
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*/
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#define s_PDiff_max_Colors 16
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/* PixelDifferenceDecode / PixelDifferenceEncode */
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typedef struct stream_PDiff_state_s {
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stream_state_common;
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/* The client sets the following before initialization. */
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int Colors; /* # of colors, 1..s_PDiff_max_Colors */
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int BitsPerComponent; /* 1, 2, 4, 8 */
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int Columns;
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/* The init procedure computes the following. */
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uint row_count; /* # of bytes per row */
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byte end_mask; /* mask for left-over bits in last byte */
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int case_index; /* switch index for case dispatch */
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/* The following are updated dynamically. */
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uint row_left; /* # of bytes left in row */
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uint prev[s_PDiff_max_Colors]; /* previous sample */
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} stream_PDiff_state;
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#define private_st_PDiff_state() /* in spdiff.c */\
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gs_private_st_simple(st_PDiff_state, stream_PDiff_state,\
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"PixelDifferenceEncode/Decode state")
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#define s_PDiff_set_defaults_inline(ss)\
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((ss)->Colors = 1, (ss)->BitsPerComponent = 8, (ss)->Columns = 1)
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extern const stream_template s_PDiffD_template;
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extern const stream_template s_PDiffE_template;
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#endif /* spdiffx_INCLUDED */
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