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/* Copyright (C) 1997, 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: gxsample.h,v 1.7 2005/06/08 14:38:21 igor Exp $ */
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/* Sample lookup and expansion */
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#ifndef gxsample_INCLUDED
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# define gxsample_INCLUDED
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/*
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* The following union implements the expansion of sample
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* values from N bits to 8, and a possible linear transformation.
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*/
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typedef union sample_lookup_s {
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bits32 lookup4x1to32[16]; /* 1 bit/sample, not spreading */
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bits16 lookup2x2to16[16]; /* 2 bits/sample, not spreading */
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byte lookup8[256]; /* 1 bit/sample, spreading [2] */
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/* 2 bits/sample, spreading [4] */
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/* 4 bits/sample [16] */
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/* 8 bits/sample [256] */
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} sample_lookup_t;
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/*
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* Define identity and inverted expansion lookups for 1-bit input values.
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* These can be cast to a const sample_lookup_t.
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*/
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extern const bits32 lookup4x1to32_identity[16];
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extern const bits32 lookup4x1to32_inverted[16];
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#ifndef sample_map_DEFINED
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#define sample_map_DEFINED
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typedef struct sample_map_s sample_map;
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#endif
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/*
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* Define procedures to unpack and shuffle image data samples. The Unix C
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* compiler can't handle typedefs for procedure (as opposed to
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* pointer-to-procedure) types, so we have to do it with macros instead.
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*
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* The original data start at sample data_x relative to data.
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* bptr points to the buffer normally used to deliver the unpacked data.
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* The unpacked data are at sample *pdata_x relative to the return value.
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*
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* Note that this procedure may return either a pointer to the buffer, or
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* a pointer to the original data.
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*/
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#define SAMPLE_UNPACK_PROC(proc)\
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const byte *proc(byte *bptr, int *pdata_x, const byte * data, int data_x,\
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uint dsize, const sample_map *smap, int spread,\
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int num_components_per_plane)
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typedef SAMPLE_UNPACK_PROC((*sample_unpack_proc_t));
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/*
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* Declare the 1-for-1 unpacking procedure.
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*/
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SAMPLE_UNPACK_PROC(sample_unpack_copy);
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/*
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* Declare unpacking procedures for 1, 2, 4, and 8 bits per pixel,
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* with optional spreading of the result.
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*/
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SAMPLE_UNPACK_PROC(sample_unpack_1);
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SAMPLE_UNPACK_PROC(sample_unpack_2);
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SAMPLE_UNPACK_PROC(sample_unpack_4);
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SAMPLE_UNPACK_PROC(sample_unpack_8);
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SAMPLE_UNPACK_PROC(sample_unpack_1_interleaved);
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SAMPLE_UNPACK_PROC(sample_unpack_2_interleaved);
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SAMPLE_UNPACK_PROC(sample_unpack_4_interleaved);
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SAMPLE_UNPACK_PROC(sample_unpack_8_interleaved);
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#endif /* gxsample_INCLUDED */
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