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% directions.w
%
% Copyright 2009-2014 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/>.
@ @c
#include "ptexlib.h"
@ @c
void scan_direction(void)
{
int save_cur_cmd = cur_cmd;
int save_cur_chr = cur_chr;
get_x_token();
if (cur_cmd == assign_dir_cmd) {
cur_val = eqtb[cur_chr].cint;
goto EXIT;
} else {
back_input();
}
if (scan_keyword("TLT")) {
cur_val = dir_TLT;
} else if (scan_keyword("TRT")) {
cur_val = dir_TRT;
} else if (scan_keyword("LTL")) {
cur_val = dir_LTL;
} else if (scan_keyword("RTT")) {
cur_val = dir_RTT;
} else {
tex_error("Bad direction", NULL);
cur_val = 0;
}
get_x_token();
if (cur_cmd != spacer_cmd)
back_input();
EXIT:
cur_cmd = save_cur_cmd;
cur_chr = save_cur_chr;
}
@ the next two are used by postlinebreak.c
@c
halfword do_push_dir_node(halfword p, halfword a)
{
halfword n = copy_node(a);
vlink(n) = p;
return n;
}
halfword do_pop_dir_node(halfword p)
{
halfword n = vlink(p);
flush_node(p);
return n;
}
@ @c
halfword dir_ptr;
halfword text_dir_ptr;
@ There is no need to do anything here at the moment.
@c
void initialize_directions(void)
{
}
@ @c
halfword new_dir(int s)
{
halfword p = new_node(dir_node, 0);
dir_dir(p) = s;
dir_dvi_ptr(p) = -1;
dir_level(p) = cur_level;
return p;
}
@ The global static array variable |dir_strings| is also used
by the lua nodelib interface, so it cannot be static. Putting
it here instead of there avoid the nodelib having to know
about the actual values of |dir_TRT| etc.
@c
/*
const char *dir_strings[128] = {
"-TLT","???", "???", "???", "-TRT","???", "???", "???",
"???", "-LTL","???", "???", "???", "???", "???", "???",
"???", "???", "???", "???", "???", "???", "???", "???",
"-RTT","???", "???", "???", "???", "???", "???", "???",
"???", "???", "???", "???", "???", "???", "???", "???",
"???", "???", "???", "???", "???", "???", "???", "???",
"???", "???", "???", "???", "???", "???", "???", "???",
"???", "???", "???", "???", "???", "???", "???", "???",
"+TLT","???", "???", "???", "+TRT","???", "???", "???",
"???", "+LTL","???", "???", "???", "???", "???", "???",
"???", "???", "???", "???", "???", "???", "???", "???",
"+RTT","???", "???", "???", "???", "???", "???", "???",
"???", "???", "???", "???", "???", "???", "???", "???",
"???", "???", "???", "???", "???", "???", "???", "???",
"???", "???", "???", "???", "???", "???", "???", "???",
"???", "???", "???", "???", "???", "???", "???", "???"
};
int dir_swap = 64;
*/
const char *dir_strings[8] = {
"-TLT","-TRT","-LTL","-RTT",
"+TLT","+TRT","+LTL","+RTT",
};
int dir_swap = 4;
const char *string_dir(int d)
{
return (dir_strings[d+dir_swap]+1);
}
@ @c
void print_dir(int d)
{
tprint(string_dir(d));
}
@ @c
scaled pack_width(int curdir, int pdir, halfword p, boolean isglyph)
{
scaled wd = 0;
if (isglyph) {
if (textdir_parallel(curdir, pdir) == textglyphdir_orthogonal(pdir)) {
wd = glyph_width(p);
if (ex_glyph(p) != 0) {
/* wd = round_xn_over_d(wd, 1000 + ex_glyph(p)/1000, 1000); */
wd = ext_xn_over_d(wd, 1000000+ex_glyph(p), 1000000);
}
} else {
wd = glyph_depth(p) + glyph_height(p);
}
/* experimental */
wd += x_advance(p);
} else { /* hlist, vlist, image, form, rule */
if (textdir_parallel(pdir, curdir))
wd = width(p);
else
wd = depth(p) + height(p);
}
return wd;
}
@ @c
scaled_whd pack_width_height_depth(int curdir, int pdir, halfword p, boolean isglyph)
{
scaled_whd whd = { 0, 0, 0 };
whd.wd = pack_width(curdir, pdir, p, isglyph);
if (isglyph) {
if (is_rotated(curdir)) {
if (textdir_parallel(curdir, pdir))
whd.ht = whd.dp = (glyph_height(p) + glyph_depth(p)) / 2;
else
whd.ht = whd.dp = glyph_width(p) / 2;
} else if (is_rotated(pdir)) {
if (textdir_parallel(curdir, pdir))
whd.ht = whd.dp = (glyph_height(p) + glyph_depth(p)) / 2;
else
whd.ht = glyph_width(p);
} else {
if (glyphdir_eq(curdir, pdir)) {
whd.ht = glyph_height(p);
whd.dp = glyph_depth(p);
} else if (glyphdir_opposite(curdir, pdir)) {
whd.ht = glyph_depth(p);
whd.dp = glyph_height(p);
} else
whd.ht = glyph_width(p);
}
} else {
if (is_rotated(curdir)) {
if (textdir_parallel(curdir, pdir))
whd.ht = whd.dp = (height(p) + depth(p)) / 2;
else
whd.ht = whd.dp = width(p) / 2;
} else if (pardir_eq(curdir, pdir)) {
whd.ht = height(p);
whd.dp = depth(p);
} else if (pardir_opposite(curdir, pdir)) {
whd.ht = depth(p);
whd.dp = height(p);
} else
whd.ht = width(p);
}
return whd;
}
@ @c
void update_text_dir_ptr(int val)
{
if (dir_level(text_dir_ptr) == cur_level) {
/* update */
dir_dir(text_dir_ptr) = val;
} else {
/* addition */
halfword text_dir_tmp = new_dir(val);
vlink(text_dir_tmp) = text_dir_ptr;
text_dir_ptr = text_dir_tmp;
}
}
|
