font.h revision 151497 
1// -*- C++ -*-
2/* Copyright (C) 1989, 1990, 1991, 1992, 2002, 2004
3   Free Software Foundation, Inc.
4     Written by James Clark (jjc@jclark.com)
5
6This file is part of groff.
7
8groff is free software; you can redistribute it and/or modify it under
9the terms of the GNU General Public License as published by the Free
10Software Foundation; either version 2, or (at your option) any later
11version.
12
13groff is distributed in the hope that it will be useful, but WITHOUT ANY
14WARRANTY; without even the implied warranty of MERCHANTABILITY or
15FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16for more details.
17
18You should have received a copy of the GNU General Public License along
19with groff; see the file COPYING.  If not, write to the Free Software
20Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
21
22typedef void (*FONT_COMMAND_HANDLER)(const char *, const char *,
23				     const char *, int);
24
25struct font_kern_list;
26struct font_char_metric;
27struct font_widths_cache;
28
29class font {
30public:
31  enum {
32    LIG_ff = 1,
33    LIG_fi = 2,
34    LIG_fl = 4,
35    LIG_ffi = 8,
36    LIG_ffl = 16
37    };
38
39  virtual ~font();
40  int contains(int index);
41  int is_special();
42  int get_width(int index, int point_size);
43  int get_height(int index, int point_size);
44  int get_depth(int index, int point_size);
45  int get_space_width(int point_size);
46  int get_character_type(int index);
47  int get_kern(int index1, int index2, int point_size);
48  int get_skew(int index, int point_size, int slant);
49  int has_ligature(int);
50  int get_italic_correction(int index, int point_size);
51  int get_left_italic_correction(int index, int point_size);
52  int get_subscript_correction(int index, int point_size);
53  int get_code(int i);
54  const char *get_special_device_encoding(int index);
55  const char *get_name();
56  const char *get_internal_name();
57  const char *get_image_generator();
58
59  static int scan_papersize(const char *, const char **, double *, double *);
60
61  static font *load_font(const char *, int * = 0, int = 0);
62  static void command_line_font_dir(const char *path);
63  static FILE *open_file(const char *name, char **pathp);
64  static int load_desc();
65  static int name_to_index(const char *);
66  static int number_to_index(int);
67  static FONT_COMMAND_HANDLER
68    set_unknown_desc_command_handler(FONT_COMMAND_HANDLER);
69
70  static int res;
71  static int hor;
72  static int vert;
73  static int unitwidth;
74  static int paperwidth;
75  static int paperlength;
76  static const char *papersize;
77  static int biggestfont;
78  static int spare2;
79  static int sizescale;
80  static int tcommand;
81  static int unscaled_charwidths;
82  static int pass_filenames;
83  static int use_charnames_in_special;
84  static const char *image_generator;
85
86  static const char **font_name_table;
87  static const char **style_table;
88  static const char *family;
89  static int *sizes;
90private:
91  unsigned ligatures;
92  font_kern_list **kern_hash_table;
93  int space_width;
94  int *ch_index;
95  int nindices;
96  font_char_metric *ch;
97  int ch_used;
98  int ch_size;
99  int special;
100  char *name;
101  char *internalname;
102  double slant;
103  font_widths_cache *widths_cache;
104  static FONT_COMMAND_HANDLER unknown_desc_command_handler;
105
106  enum { KERN_HASH_TABLE_SIZE = 503 };
107
108  void add_entry(int index, const font_char_metric &);
109  void copy_entry(int new_index, int old_index);
110  void add_kern(int index1, int index2, int amount);
111  static int hash_kern(int i1, int i2);
112  void alloc_ch_index(int);
113  void extend_ch();
114  void compact();
115
116  static int scale(int w, int pointsize);
117  static int unit_scale(double *value, char unit);
118  virtual void handle_unknown_font_command(const char *command,
119					   const char *arg,
120					   const char *file, int lineno);
121protected:
122  font(const char *);
123  int load(int * = 0, int = 0);
124};
125