summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/luatexdir/font/dofont.w
blob: 3dad8b50abe54d5d1ffe02a0f5057a3666017e72 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
% 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
#include "ptexlib.h"

#include "lua/luatex-api.h"

static const char _svn_version[] =
    "$Id: dofont.w 3584 2010-04-02 17:45:55Z hhenkel $ "
    "$URL: http://foundry.supelec.fr/svn/luatex/branches/0.60.x/source/texk/web2c/luatexdir/font/dofont.w $";

@ 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)) {
                lua_number2int(r, 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;
    }
}