include/font.h

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