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/* directions.h
Copyright 2009 Taco Hoekwater <taco@luatex.org>
This file is part of LuaTeX.
LuaTeX is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
LuaTeX is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU General Public License along
with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
#ifndef DIRECTIONS_H
# define DIRECTIONS_H
# define dir_T 0
# define dir_L 1
# define dir_B 2
# define dir_R 3
# define dir_TLT 0
# define dir_TRT 4
# define dir_LTL 9
# define dir_RTT 24
extern const char *dir_strings[128];
/* # define dir_array_size 25 *//* |dir_RTT + 1| */
/* inv(primary) == tertiary */
/*
boolean _is_mirrored[dir_array_size];
_is_mirrored[dir_TLT] = 0;
_is_mirrored[dir_TRT] = 0;
_is_mirrored[dir_LTL] = 0;
_is_mirrored[dir_RTT] = 0;
*/
# define is_mirrored(a) 0
/* secondary == tertiary */
/*
boolean _is_rotated[dir_array_size];
_is_rotated[dir_TLT] = 0;
_is_rotated[dir_TRT] = 0;
_is_rotated[dir_LTL] = 0;
_is_rotated[dir_RTT] = 1;
*/
# define is_rotated(a) (a == dir_RTT)
/* secondary == secondary */
/*
boolean _textdir_parallel[dir_array_size][dir_array_size];
_textdir_parallel[dir_TLT][dir_TLT] = 1;
_textdir_parallel[dir_TLT][dir_TRT] = 1;
_textdir_parallel[dir_TLT][dir_LTL] = 0;
_textdir_parallel[dir_TLT][dir_RTT] = 0;
_textdir_parallel[dir_TRT][dir_TLT] = 1;
_textdir_parallel[dir_TRT][dir_TRT] = 1;
_textdir_parallel[dir_TRT][dir_LTL] = 0;
_textdir_parallel[dir_TRT][dir_RTT] = 0;
_textdir_parallel[dir_LTL][dir_TLT] = 0;
_textdir_parallel[dir_LTL][dir_TRT] = 0;
_textdir_parallel[dir_LTL][dir_LTL] = 1;
_textdir_parallel[dir_LTL][dir_RTT] = 1;
_textdir_parallel[dir_RTT][dir_TLT] = 0;
_textdir_parallel[dir_RTT][dir_TRT] = 0;
_textdir_parallel[dir_RTT][dir_LTL] = 1;
_textdir_parallel[dir_RTT][dir_RTT] = 1;
*/
# define textdir_parallel(a,b) (((a == dir_TLT || a == dir_TRT)&&(b == dir_TLT || b == dir_TRT)) || \
((a == dir_LTL || a == dir_RTT)&&(b == dir_LTL || b == dir_RTT)))
/* primary == primary */
/*
boolean _pardir_parallel[dir_array_size][dir_array_size];
_pardir_parallel[dir_TLT][dir_TLT] = 1;
_pardir_parallel[dir_TLT][dir_TRT] = 1;
_pardir_parallel[dir_TLT][dir_LTL] = 0;
_pardir_parallel[dir_TLT][dir_RTT] = 0;
_pardir_parallel[dir_TRT][dir_TLT] = 1;
_pardir_parallel[dir_TRT][dir_TRT] = 1;
_pardir_parallel[dir_TRT][dir_LTL] = 0;
_pardir_parallel[dir_TRT][dir_RTT] = 0;
_pardir_parallel[dir_LTL][dir_TLT] = 0;
_pardir_parallel[dir_LTL][dir_TRT] = 0;
_pardir_parallel[dir_LTL][dir_LTL] = 1;
_pardir_parallel[dir_LTL][dir_RTT] = 1;
_pardir_parallel[dir_RTT][dir_TLT] = 0;
_pardir_parallel[dir_RTT][dir_TRT] = 0;
_pardir_parallel[dir_RTT][dir_LTL] = 1;
_pardir_parallel[dir_RTT][dir_RTT] = 1;
*/
# define pardir_parallel(a,b) (((a == dir_TLT || a == dir_TRT)&&(b == dir_TLT || b == dir_TRT)) || \
((a == dir_LTL || a == dir_RTT)&&(b == dir_LTL || b == dir_RTT)))
/* inv(primary) == primary */
/*
boolean _pardir_opposite[dir_array_size][dir_array_size];
_pardir_opposite[dir_TLT][dir_TLT] = 0;
_pardir_opposite[dir_TLT][dir_TRT] = 0;
_pardir_opposite[dir_TLT][dir_LTL] = 0;
_pardir_opposite[dir_TLT][dir_RTT] = 0;
_pardir_opposite[dir_TRT][dir_TLT] = 0;
_pardir_opposite[dir_TRT][dir_TRT] = 0;
_pardir_opposite[dir_TRT][dir_LTL] = 0;
_pardir_opposite[dir_TRT][dir_RTT] = 0;
_pardir_opposite[dir_LTL][dir_TLT] = 0;
_pardir_opposite[dir_LTL][dir_TRT] = 0;
_pardir_opposite[dir_LTL][dir_LTL] = 0;
_pardir_opposite[dir_LTL][dir_RTT] = 1;
_pardir_opposite[dir_RTT][dir_TLT] = 0;
_pardir_opposite[dir_RTT][dir_TRT] = 0;
_pardir_opposite[dir_RTT][dir_LTL] = 1;
_pardir_opposite[dir_RTT][dir_RTT] = 0;
*/
# define pardir_opposite(a,b) ((a == dir_LTL && b == dir_RTT)||(a == dir_RTT && b == dir_LTL))
/* inv(secondary) == secondary */
/*
boolean _textdir_opposite[dir_array_size][dir_array_size];
_textdir_opposite[dir_TLT][dir_TLT] = 0;
_textdir_opposite[dir_TLT][dir_TRT] = 1;
_textdir_opposite[dir_TLT][dir_LTL] = 0;
_textdir_opposite[dir_TLT][dir_RTT] = 0;
_textdir_opposite[dir_TRT][dir_TLT] = 1;
_textdir_opposite[dir_TRT][dir_TRT] = 0;
_textdir_opposite[dir_TRT][dir_LTL] = 0;
_textdir_opposite[dir_TRT][dir_RTT] = 0;
_textdir_opposite[dir_LTL][dir_TLT] = 0;
_textdir_opposite[dir_LTL][dir_TRT] = 0;
_textdir_opposite[dir_LTL][dir_LTL] = 0;
_textdir_opposite[dir_LTL][dir_RTT] = 0;
_textdir_opposite[dir_RTT][dir_TLT] = 0;
_textdir_opposite[dir_RTT][dir_TRT] = 0;
_textdir_opposite[dir_RTT][dir_LTL] = 0;
_textdir_opposite[dir_RTT][dir_RTT] = 0;
*/
# define textdir_opposite(a,b) ((a == dir_TLT && b == dir_TRT)||(a == dir_TRT && b == dir_TLT))
/* inv(tertiary) == tertiary */
/*
boolean _glyphdir_opposite[dir_array_size][dir_array_size];
_glyphdir_opposite[dir_TLT][dir_TLT] = 0;
_glyphdir_opposite[dir_TLT][dir_TRT] = 0;
_glyphdir_opposite[dir_TLT][dir_LTL] = 0;
_glyphdir_opposite[dir_TLT][dir_RTT] = 0;
_glyphdir_opposite[dir_TRT][dir_TLT] = 0;
_glyphdir_opposite[dir_TRT][dir_TRT] = 0;
_glyphdir_opposite[dir_TRT][dir_LTL] = 0;
_glyphdir_opposite[dir_TRT][dir_RTT] = 0;
_glyphdir_opposite[dir_LTL][dir_TLT] = 0;
_glyphdir_opposite[dir_LTL][dir_TRT] = 0;
_glyphdir_opposite[dir_LTL][dir_LTL] = 0;
_glyphdir_opposite[dir_LTL][dir_RTT] = 0;
_glyphdir_opposite[dir_RTT][dir_TLT] = 0;
_glyphdir_opposite[dir_RTT][dir_TRT] = 0;
_glyphdir_opposite[dir_RTT][dir_LTL] = 0;
_glyphdir_opposite[dir_RTT][dir_RTT] = 0;
*/
# define glyphdir_opposite(a,b) 0
/* primary == primary */
/*
boolean _pardir_eq[dir_array_size][dir_array_size];
_pardir_eq[dir_TLT][dir_TLT] = 1;
_pardir_eq[dir_TLT][dir_TRT] = 1;
_pardir_eq[dir_TLT][dir_LTL] = 0;
_pardir_eq[dir_TLT][dir_RTT] = 0;
_pardir_eq[dir_TRT][dir_TLT] = 1;
_pardir_eq[dir_TRT][dir_TRT] = 1;
_pardir_eq[dir_TRT][dir_LTL] = 0;
_pardir_eq[dir_TRT][dir_RTT] = 0;
_pardir_eq[dir_LTL][dir_TLT] = 0;
_pardir_eq[dir_LTL][dir_TRT] = 0;
_pardir_eq[dir_LTL][dir_LTL] = 1;
_pardir_eq[dir_LTL][dir_RTT] = 0;
_pardir_eq[dir_RTT][dir_TLT] = 0;
_pardir_eq[dir_RTT][dir_TRT] = 0;
_pardir_eq[dir_RTT][dir_LTL] = 0;
_pardir_eq[dir_RTT][dir_RTT] = 1;
*/
# define pardir_eq(a,b) (((a == dir_TLT || a == dir_TRT)&&(b == dir_TLT || b == dir_TRT))|| \
(a == dir_LTL && b == dir_LTL) || \
(a == dir_RTT && b == dir_RTT))
/* secondary == secondary */
/*
boolean _textdir_eq[dir_array_size][dir_array_size];
_textdir_eq[dir_TLT][dir_TLT] = 1;
_textdir_eq[dir_TLT][dir_TRT] = 0;
_textdir_eq[dir_TLT][dir_LTL] = 0;
_textdir_eq[dir_TLT][dir_RTT] = 0;
_textdir_eq[dir_TRT][dir_TLT] = 0;
_textdir_eq[dir_TRT][dir_TRT] = 1;
_textdir_eq[dir_TRT][dir_LTL] = 0;
_textdir_eq[dir_TRT][dir_RTT] = 0;
_textdir_eq[dir_LTL][dir_TLT] = 0;
_textdir_eq[dir_LTL][dir_TRT] = 0;
_textdir_eq[dir_LTL][dir_LTL] = 1;
_textdir_eq[dir_LTL][dir_RTT] = 1;
_textdir_eq[dir_RTT][dir_TLT] = 0;
_textdir_eq[dir_RTT][dir_TRT] = 0;
_textdir_eq[dir_RTT][dir_LTL] = 1;
_textdir_eq[dir_RTT][dir_RTT] = 1;
*/
# define textdir_eq(a,b) ((a == dir_TLT && b == dir_TLT) || \
(a == dir_TRT && b == dir_TRT) || \
(a == dir_LTL && (b == dir_LTL || b == dir_RTT)) || \
(a == dir_RTT && (b == dir_LTL || b == dir_RTT))
/* tertiary == tertiary */
/*
boolean _glyphdir_eq[dir_array_size][dir_array_size];
_glyphdir_eq[dir_TLT][dir_TLT] = 1;
_glyphdir_eq[dir_TLT][dir_TRT] = 1;
_glyphdir_eq[dir_TLT][dir_LTL] = 0;
_glyphdir_eq[dir_TLT][dir_RTT] = 1;
_glyphdir_eq[dir_TRT][dir_TLT] = 1;
_glyphdir_eq[dir_TRT][dir_TRT] = 1;
_glyphdir_eq[dir_TRT][dir_LTL] = 0;
_glyphdir_eq[dir_TRT][dir_RTT] = 1;
_glyphdir_eq[dir_LTL][dir_TLT] = 0;
_glyphdir_eq[dir_LTL][dir_TRT] = 0;
_glyphdir_eq[dir_LTL][dir_LTL] = 1;
_glyphdir_eq[dir_LTL][dir_RTT] = 0;
_glyphdir_eq[dir_RTT][dir_TLT] = 1;
_glyphdir_eq[dir_RTT][dir_TRT] = 1;
_glyphdir_eq[dir_RTT][dir_LTL] = 0;
_glyphdir_eq[dir_RTT][dir_RTT] = 1;
*/
# define glyphdir_eq(a,b) ((a != dir_LTL && b != dir_LTL) || \
(a == dir_LTL && b == dir_LTL))
/* primary == secondary */
/*
boolean _partextdir_eq[dir_array_size][dir_array_size];
_partextdir_eq[dir_TLT][dir_TLT] = 0;
_partextdir_eq[dir_TLT][dir_TRT] = 0;
_partextdir_eq[dir_TLT][dir_LTL] = 1;
_partextdir_eq[dir_TLT][dir_RTT] = 1;
_partextdir_eq[dir_TRT][dir_TLT] = 0;
_partextdir_eq[dir_TRT][dir_TRT] = 0;
_partextdir_eq[dir_TRT][dir_LTL] = 1;
_partextdir_eq[dir_TRT][dir_RTT] = 1;
_partextdir_eq[dir_LTL][dir_TLT] = 1;
_partextdir_eq[dir_LTL][dir_TRT] = 0;
_partextdir_eq[dir_LTL][dir_LTL] = 0;
_partextdir_eq[dir_LTL][dir_RTT] = 0;
_partextdir_eq[dir_RTT][dir_TLT] = 0;
_partextdir_eq[dir_RTT][dir_TRT] = 1;
_partextdir_eq[dir_RTT][dir_LTL] = 0;
_partextdir_eq[dir_RTT][dir_RTT] = 0;
*/
# define partextdir_eq(a,b) (((a == dir_TLT || a == dir_TRT)&&(b == dir_LTL || b == dir_RTT)) || \
(a == dir_LTL && b == dir_TLT) || \
(a == dir_RTT && b == dir_TRT))
/* secondary != tertiary */
/*
boolean _textglyphdir_orthogonal[dir_array_size]
_textglyphdir_orthogonal[dir_TLT] = 1;
_textglyphdir_orthogonal[dir_TRT] = 1;
_textglyphdir_orthogonal[dir_LTL] = 1;
_textglyphdir_orthogonal[dir_RTT] = 0;
*/
# define textglyphdir_orthogonal(a) (a != dir_RTT)
/* secondary == L */
/*
boolean _textdir_is[dir_array_size];
_textdir_is[dir_TLT] = 1;
_textdir_is[dir_TRT] = 1;
_textdir_is[dir_LTL] = 1;
_textdir_is[dir_RTT] = 0;
*/
# define textdir_is_L(a) (a == dir_TLT)
# define push_dir(a,b) \
{ halfword dir_tmp=new_dir((a)); \
vlink(dir_tmp)=b; \
b=dir_tmp; \
}
# define push_dir_node(a,b) \
{ halfword dir_tmp=copy_node((a)); \
vlink(dir_tmp)=b; \
b=dir_tmp; \
}
# define pop_dir_node(b) \
{ halfword dir_tmp=b; \
b=vlink(dir_tmp); \
flush_node(dir_tmp); \
}
extern halfword dir_ptr;
extern halfword text_dir_ptr;
extern void initialize_directions(void);
extern halfword new_dir(int s);
extern const char *string_dir(int d);
extern void print_dir(int d);
extern void scan_direction(void);
extern halfword do_push_dir_node(halfword p, halfword a);
extern halfword do_pop_dir_node(halfword p);
scaled pack_width(int curdir, int pdir, halfword p, boolean isglyph);
scaled_whd pack_width_height_depth(int curdir, int pdir, halfword p,
boolean isglyph);
void update_text_dir_ptr(int val);
#endif
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