gnu/usr.bin/groff/libgroff/font.h

   1 // -*- C++ -*-
   2 /* Copyright (C) 1989, 1990 Free Software Foundation, Inc.
   3      Written by James Clark (jjc@jclark.uucp)
   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 1, 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 LICENSE.  If not, write to the Free Software
  19 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  20
  21
  22 struct font_kern_list;
  23 struct font_char_metric;
  24
  25 class font {
  26 public:
  27   enum {
  28     LIG_ff = 1,
  29     LIG_fi = 2,
  30     LIG_fl = 4,
  31     LIG_ffi = 8,
  32     LIG_ffl = 16
  33     };
  34
  35   virtual ~font();
  36   int contains(int index);
  37   int is_special();
  38   int get_width(int index, int point_size);
  39   int get_height(int index, int point_size);
  40   int get_depth(int index, int point_size);
  41   int get_space_width(int point_size);
  42   int get_character_type(int index);
  43   int get_kern(int index1, int index2, int point_size);
  44   int get_skew(int index, int point_size, int slant);
  45   int has_ligature(int);
  46   int get_italic_correction(int index, int point_size);
  47   int get_left_italic_correction(int index, int point_size);
  48   int get_subscript_correction(int index, int point_size);
  49   unsigned char get_code(int i);
  50   const char *get_name();
  51   const char *get_internal_name();
  52
  53   static font *load_font(const char *);
  54   static void command_line_font_dir(const char *path);
  55   static void forget_command_line_font_dirs();
  56   static void set_device_name(const char *);
  57   static const char *get_device_name();
  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(unsigned char);
  62
  63   static int res;
  64   static int hor;
  65   static int vert;
  66   static int unitwidth;
  67   static int paperwidth;
  68   static int paperlength;
  69   static int biggestfont;
  70   static int spare2;
  71   static int sizescale;
  72   static int tcommand;
  73
  74   static const char **font_name_table;
  75   static const char **style_table;
  76   static const char *family;
  77   static int *sizes;
  78 private:
  79   unsigned ligatures;
  80   font_kern_list **kern_hash_table;
  81   int space_width;
  82   short *ch_index;
  83   int nindices;
  84   font_char_metric *ch;
  85   int ch_used;
  86   int ch_size;
  87   int special;
  88   char *name;
  89   char *internalname;
  90   double slant;
  91
  92   static char *dev_name;
  93   static char *cl_font_dirs;
  94
  95   enum { KERN_HASH_TABLE_SIZE = 503 };
  96
  97   void add_entry(int index, const font_char_metric &);
  98   void copy_entry(int new_index, int old_index);
  99   void add_kern(int index1, int index2, int amount);
 100   static int hash_kern(int i1, int i2);
 101   void alloc_ch_index(int);
 102   void extend_ch();
 103   void compact();
 104
 105   static int scale(int w, int pointsize);
 106   virtual void handle_unknown_font_command(int argc, const char **argv);
 107 protected:
 108   font(const char *);
 109   int load();
 110 };