/contrib/groff/src/include/font.h

  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};