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
   6 This file is part of groff.
   7
   8 groff is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License along
  19 with groff; see the file COPYING.  If not, write to the Free Software
  20 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
  21
  22 typedef void (*FONT_COMMAND_HANDLER)(const char *, const char *,
  23                                      const char *, int);
  24
  25 struct font_kern_list;
  26 struct font_char_metric;
  27 struct font_widths_cache;
  28
  29 class font {
  30 public:
  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;
  90 private:
  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);
 121 protected:
 122   font(const char *);
 123   int load(int * = 0, int = 0);
 124 };