font.h revision 75584 
1// -*- C++ -*-
2/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
3     Written by James Clark (jjc@jclark.com)
4
5This file is part of groff.
6
7groff is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
11
12groff is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License along
18with groff; see the file COPYING.  If not, write to the Free Software
19Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21typedef void (*FONT_COMMAND_HANDLER)(const char *, const char *,
22				     const char *, int);
23
24struct font_kern_list;
25struct font_char_metric;
26struct font_widths_cache;
27
28class font {
29public:
30  enum {
31    LIG_ff = 1,
32    LIG_fi = 2,
33    LIG_fl = 4,
34    LIG_ffi = 8,
35    LIG_ffl = 16
36    };
37
38  virtual ~font();
39  int contains(int index);
40  int is_special();
41  int get_width(int index, int point_size);
42  int get_height(int index, int point_size);
43  int get_depth(int index, int point_size);
44  int get_space_width(int point_size);
45  int get_character_type(int index);
46  int get_kern(int index1, int index2, int point_size);
47  int get_skew(int index, int point_size, int slant);
48  int has_ligature(int);
49  int get_italic_correction(int index, int point_size);
50  int get_left_italic_correction(int index, int point_size);
51  int get_subscript_correction(int index, int point_size);
52  int get_code(int i);
53  const char *get_special_device_encoding(int index);
54  const char *get_name();
55  const char *get_internal_name();
56
57  static font *load_font(const char *, int *not_found = 0);
58  static void command_line_font_dir(const char *path);
59  static FILE *open_file(const char *name, char **pathp);
60  static int load_desc();
61  static int name_to_index(const char *);
62  static int number_to_index(int);
63  static FONT_COMMAND_HANDLER
64    set_unknown_desc_command_handler(FONT_COMMAND_HANDLER);
65
66  static int res;
67  static int hor;
68  static int vert;
69  static int unitwidth;
70  static int paperwidth;
71  static int paperlength;
72  static int biggestfont;
73  static int spare2;
74  static int sizescale;
75  static int tcommand;
76  static int pass_filenames;
77  static int use_charnames_in_special;
78
79  static const char **font_name_table;
80  static const char **style_table;
81  static const char *family;
82  static int *sizes;
83private:
84  unsigned ligatures;
85  font_kern_list **kern_hash_table;
86  int space_width;
87  short *ch_index;
88  int nindices;
89  font_char_metric *ch;
90  int ch_used;
91  int ch_size;
92  int special;
93  char *name;
94  char *internalname;
95  double slant;
96  font_widths_cache *widths_cache;
97  static FONT_COMMAND_HANDLER unknown_desc_command_handler;
98
99  enum { KERN_HASH_TABLE_SIZE = 503 };
100
101  void add_entry(int index, const font_char_metric &);
102  void copy_entry(int new_index, int old_index);
103  void add_kern(int index1, int index2, int amount);
104  static int hash_kern(int i1, int i2);
105  void alloc_ch_index(int);
106  void extend_ch();
107  void compact();
108
109  static int scale(int w, int pointsize);
110  virtual void handle_unknown_font_command(const char *command,
111					   const char *arg,
112					   const char *file, int lineno);
113protected:
114  font(const char *);
115  int load(int *not_found = 0);
116};
117