56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
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/* #ident "@(#)g3.h 3.1 95/08/30 Copyright (c) Gert Doering" */
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#ifndef NULL
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#define NULL 0L
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#endif
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/* nr_bits is set to ( bit_length MOD FBITS ) by build_g3_tree,
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* nr_pels is the number of pixels to write for that code,
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* bit_code is the code itself (msb2lsb), and bit_length its length
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*/
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struct g3code { int nr_bits, nr_pels, bit_code, bit_length; };
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/* tables for makeup / terminal codes white / black, extended m_codes */
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extern struct g3code t_white[], m_white[], t_black[], m_black[], m_ext[];
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/* The number of bits looked up simultaneously determines the amount
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* of memory used by the program - some values:
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* 10 bits : 87 Kbytes, 8 bits : 20 Kbytes
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* 5 bits : 6 Kbytes, 1 bit : 4 Kbytes
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* - naturally, using less bits is also slower...
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*/
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/*
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#define FBITS 5
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#define BITM 0x1f
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*/
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#define FBITS 8
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#define BITM 0xff
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/*
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#define FBITS 12
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#define BITM 0xfff
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*/
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#define BITN 1<<FBITS
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struct g3_tree { int nr_bits;
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struct g3_tree * nextb[ BITN ];
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};
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#define g3_leaf g3code
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extern void tree_add_node ( struct g3_tree *p, struct g3code * g3c,
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int bit_code, int bit_length );
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extern void build_tree ( struct g3_tree ** p, struct g3code * c );
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#ifdef DEBUG
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extern void print_g3_tree ( char * t, struct g3_tree * p );
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#endif
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extern void init_byte_tab ( int reverse, int byte_tab[] );
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