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% dofont.w
%
% Copyright 2006-2010 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
static const char _svn_version[] =
"$Id: dofont.w 4524 2012-12-20 15:38:02Z taco $"
"$URL: https://foundry.supelec.fr/svn/luatex/trunk/source/texk/web2c/luatexdir/font/dofont.w $";
#include "ptexlib.h"
#include "lua/luatex-api.h"
@ a bit more interfacing is needed for proper error reporting
@c
static char *font_error_message(pointer u, char *nom, scaled s)
{
char *str = xmalloc(256);
char *c = makecstring(cs_text(u));
const char *extra = "metric data not found or bad";
if (s >= 0) {
snprintf(str, 255, "Font \\%s=%s at %gpt not loadable: %s", c, nom,
(double) s / 65536, extra);
} else if (s != -1000) {
snprintf(str, 255, "Font \\%s=%s scaled %d not loadable: %s", c, nom,
(int) (-s), extra);
} else {
snprintf(str, 255, "Font \\%s=%s not loadable: %s", c, nom, extra);
}
free(c);
return str;
}
static int do_define_font(int f, const char *cnom, scaled s, int natural_dir)
{
boolean res; /* was the callback successful? */
int callback_id;
char *cnam;
int r;
res = 0;
callback_id = callback_defined(define_font_callback);
if (callback_id > 0) {
cnam = xstrdup(cnom);
callback_id = run_and_save_callback(callback_id, "Sdd->", cnam, s, f);
free(cnam);
if (callback_id > 0) { /* success */
luaL_checkstack(Luas, 1, "out of stack space");
lua_rawgeti(Luas, LUA_REGISTRYINDEX, callback_id);
if (lua_istable(Luas, -1)) {
res = font_from_lua(Luas, f);
destroy_saved_callback(callback_id);
/* |lua_pop(Luas, 1);| *//* done by |font_from_lua| */
} else if (lua_isnumber(Luas, -1)) {
r=(int)lua_tonumber(Luas, -1);
destroy_saved_callback(callback_id);
delete_font(f);
lua_pop(Luas, 1);
return r;
} else {
lua_pop(Luas, 1);
delete_font(f);
return 0;
}
}
} else if (callback_id == 0) {
res = read_tfm_info(f, cnom, s);
if (res) {
set_hyphen_char(f, int_par(default_hyphen_char_code));
set_skew_char(f, int_par(default_skew_char_code));
}
}
if (font_name(f) && strlen(font_name(f)) > 255) {
/* the font name has to fit in the dvi file's single byte storage */
/* no need to test area, as we are never using it */
res = 0;
}
if (res) {
if (font_type(f) != virtual_font_type) { /* implies lua */
do_vf(f);
set_font_natural_dir(f, natural_dir);
}
return f;
} else {
delete_font(f);
return 0;
}
}
int read_font_info(pointer u, char *cnom, scaled s, int natural_dir)
{
int f;
char *msg;
f = new_font();
if ((f = do_define_font(f, cnom, s, natural_dir))) {
return f;
} else {
const char *help[] =
{ "I wasn't able to read the size data for this font,",
"so I will ignore the font specification.",
"[Wizards can fix TFM files using TFtoPL/PLtoTF.]",
"You might try inserting a different font spec;",
"e.g., type `I\\font<same font id>=<substitute font name>'.",
NULL
};
if (int_par(suppress_fontnotfound_error_code) == 0) {
msg = font_error_message(u, cnom, s);
tex_error(msg, help);
free(msg);
}
return 0;
}
}
@ TODO This function is a placeholder. There can easily appears holes in
the |font_tables| array, and we could attempt to reuse those
@c
int find_font_id(const char *nom, scaled s)
{
int f;
f = new_font();
if ((f = do_define_font(f, nom, s, -1))) {
return f;
} else {
return 0;
}
}
|
