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- /* Copyright (C) 1996, 1999 Aladdin Enterprises. All rights reserved.
-
- This software is provided AS-IS with no warranty, either express or
- implied.
-
- This software is distributed under license and may not be copied,
- modified or distributed except as expressly authorized under the terms
- of the license contained in the file LICENSE in this distribution.
-
- For more information about licensing, please refer to
- http://www.ghostscript.com/licensing/. For information on
- commercial licensing, go to http://www.artifex.com/licensing/ or
- contact Artifex Software, Inc., 101 Lucas Valley Road #110,
- San Rafael, CA 94903, U.S.A., +1(415)492-9861.
- */
- /* $Id: spngpx.h,v 1.4 2002/02/21 22:24:54 giles Exp $ */
- /* Definitions for PNGPredictor filters */
- /* Requires strimpl.h */
- #ifndef spngpx_INCLUDED
- # define spngpx_INCLUDED
- /* PNGPredictorDecode / PNGPredictorEncode */
- typedef struct stream_PNGP_state_s {
- stream_state_common;
- /* The client sets the following before initialization. */
- int Colors; /* # of colors, 1..16 */
- int BitsPerComponent; /* 1, 2, 4, 8, 16 */
- uint Columns; /* >0 */
- int Predictor; /* 10-15, only relevant for Encode */
- /* The init procedure computes the following. */
- uint row_count; /* # of bytes per row */
- byte end_mask; /* mask for left-over bits in last byte */
- int bpp; /* bytes per pixel */
- byte *prev_row; /* previous row */
- int case_index; /* switch index for case dispatch, */
- /* set dynamically when decoding */
- /* The following are updated dynamically. */
- long row_left; /* # of bytes left in row */
- byte prev[32]; /* previous samples */
- } stream_PNGP_state;
- #define private_st_PNGP_state() /* in sPNGP.c */\
- gs_private_st_ptrs1(st_PNGP_state, stream_PNGP_state,\
- "PNGPredictorEncode/Decode state", pngp_enum_ptrs, pngp_reloc_ptrs,\
- prev_row)
- #define s_PNGP_set_defaults_inline(ss)\
- ((ss)->Colors = 1, (ss)->BitsPerComponent = 8, (ss)->Columns = 1,\
- (ss)->Predictor = 15,\
- /* Clear pointers */\
- (ss)->prev_row = 0)
- extern const stream_template s_PNGPD_template;
- extern const stream_template s_PNGPE_template;
- #endif /* spngpx_INCLUDED */
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