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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_swap 4
*/
#define dir_min_value 0
#define dir_max_value 3
#define check_dir_value(d) \
if ((d < dir_min_value) || (d > dir_max_value)) \
d = dir_min_value;
#define is_mirrored(a) 0
#define is_rotated(a) (a == dir_RTT)
/*
# 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)) \
)
# 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)) \
)
# 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) \
)
# 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))
# 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) \
)
# define dir_TLT_or_TRT(a) (a == dir_TLT || a == dir_TRT)
# define dir_LTL_or_RTT(a) (a == dir_LTL || a == dir_RTT)
*/
/* TLT TRT LTL RTT */
# define dir_TLT_or_TRT(a) (a < 2)
# define dir_LTL_or_RTT(a) (a > 1)
# define textdir_parallel(a,b) ( \
(dir_TLT_or_TRT(a) && dir_TLT_or_TRT(b)) || \
(dir_LTL_or_RTT(a) && dir_LTL_or_RTT(b)) \
)
# define pardir_parallel(a,b) ( \
(dir_TLT_or_TRT(a) && dir_TLT_or_TRT(b)) || \
(dir_LTL_or_RTT(a) && dir_LTL_or_RTT(b)) \
)
# define pardir_opposite(a,b) ( \
(a == dir_LTL && b == dir_RTT) || \
(a == dir_RTT && b == dir_LTL) \
)
# define textdir_opposite(a,b) ( \
(a == dir_TLT && b == dir_TRT) || \
(a == dir_TRT && b == dir_TLT) \
)
# define glyphdir_opposite(a,b) 0
# define pardir_eq(a,b) ( \
(dir_TLT_or_TRT(a) && dir_TLT_or_TRT(b)) || \
(a == dir_LTL && b == dir_LTL) || \
(a == dir_RTT && b == dir_RTT) \
)
# define textdir_eq(a,b) ( \
(a == dir_TLT && b == dir_TLT) || \
(a == dir_TRT && b == dir_TRT) || \
(a == dir_LTL && dir_LTL_or_RTT(b)) || \
(a == dir_RTT && dir_LTL_or_RTT(b)) \
)
# define glyphdir_eq(a,b) ( \
(a != dir_LTL && b != dir_LTL) || \
(a == dir_LTL && b == dir_LTL) \
)
# define partextdir_eq(a,b) ( \
(dir_TLT_or_TRT(a) && dir_LTL_or_RTT(b)) || \
(a == dir_LTL && b == dir_TLT) || \
(a == dir_RTT && b == dir_TRT) \
)
# define textglyphdir_orthogonal(a) (a != dir_RTT)
# define textdir_is_L(a) (a == dir_TLT)
# define push_dir(p,a) { \
halfword dir_tmp=new_dir((a)); \
vlink(dir_tmp)=p; \
p=dir_tmp; \
}
# define push_dir_node(p,a) { \
halfword dir_tmp=copy_node((a)); \
vlink(dir_tmp)=p; \
p=dir_tmp; \
}
# define pop_dir_node(p) { \
halfword dir_tmp=p; \
p=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_par(int d);
extern void print_dir_text(halfword 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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