gnu/dist/groff/src/include/font.h

   1 /*      $NetBSD$        */
   2
   3 // -*- C++ -*-
   4 /* Copyright (C) 1989, 1990, 1991, 1992, 2002, 2004
   5    Free Software Foundation, Inc.
   6      Written by James Clark (jjc@jclark.com)
   7
   8 This file is part of groff.
   9
  10 groff is free software; you can redistribute it and/or modify it under
  11 the terms of the GNU General Public License as published by the Free
  12 Software Foundation; either version 2, or (at your option) any later
  13 version.
  14
  15 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  18 for more details.
  19
  20 You should have received a copy of the GNU General Public License along
  21 with groff; see the file COPYING.  If not, write to the Free Software
  22 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
  23
  24 typedef void (*FONT_COMMAND_HANDLER)(const char *, const char *,
  25                                      const char *, int);
  26
  27 struct font_kern_list;
  28 struct font_char_metric;
  29 struct font_widths_cache;
  30
  31 class font {
  32 public:
  33   enum {
  34     LIG_ff = 1,
  35     LIG_fi = 2,
  36     LIG_fl = 4,
  37     LIG_ffi = 8,
  38     LIG_ffl = 16
  39     };
  40
  41   virtual ~font();
  42   int contains(int index);
  43   int is_special();
  44   int get_width(int index, int point_size);
  45   int get_height(int index, int point_size);
  46   int get_depth(int index, int point_size);
  47   int get_space_width(int point_size);
  48   int get_character_type(int index);
  49   int get_kern(int index1, int index2, int point_size);
  50   int get_skew(int index, int point_size, int slant);
  51   int has_ligature(int);
  52   int get_italic_correction(int index, int point_size);
  53   int get_left_italic_correction(int index, int point_size);
  54   int get_subscript_correction(int index, int point_size);
  55   int get_code(int i);
  56   const char *get_special_device_encoding(int index);
  57   const char *get_name();
  58   const char *get_internal_name();
  59   const char *get_image_generator();
  60
  61   static int scan_papersize(const char *, const char **, double *, double *);
  62
  63   static font *load_font(const char *, int * = 0, int = 0);
  64   static void command_line_font_dir(const char *path);
  65   static FILE *open_file(const char *name, char **pathp);
  66   static int load_desc();
  67   static int name_to_index(const char *);
  68   static int number_to_index(int);
  69   static FONT_COMMAND_HANDLER
  70     set_unknown_desc_command_handler(FONT_COMMAND_HANDLER);
  71
  72   static int res;
  73   static int hor;
  74   static int vert;
  75   static int unitwidth;
  76   static int paperwidth;
  77   static int paperlength;
  78   static const char *papersize;
  79   static int biggestfont;
  80   static int spare2;
  81   static int sizescale;
  82   static int tcommand;
  83   static int unscaled_charwidths;
  84   static int pass_filenames;
  85   static int use_charnames_in_special;
  86   static const char *image_generator;
  87
  88   static const char **font_name_table;
  89   static const char **style_table;
  90   static const char *family;
  91   static int *sizes;
  92 private:
  93   unsigned ligatures;
  94   font_kern_list **kern_hash_table;
  95   int space_width;
  96   int *ch_index;
  97   int nindices;
  98   font_char_metric *ch;
  99   int ch_used;
 100   int ch_size;
 101   int special;
 102   char *name;
 103   char *internalname;
 104   double slant;
 105   font_widths_cache *widths_cache;
 106   static FONT_COMMAND_HANDLER unknown_desc_command_handler;
 107
 108   enum { KERN_HASH_TABLE_SIZE = 503 };
 109
 110   void add_entry(int index, const font_char_metric &);
 111   void copy_entry(int new_index, int old_index);
 112   void add_kern(int index1, int index2, int amount);
 113   static int hash_kern(int i1, int i2);
 114   void alloc_ch_index(int);
 115   void extend_ch();
 116   void compact();
 117
 118   static int scale(int w, int pointsize);
 119   static int unit_scale(double *value, char unit);
 120   virtual void handle_unknown_font_command(const char *command,
 121                                            const char *arg,
 122                                            const char *file, int lineno);
 123 protected:
 124   font(const char *);
 125   int load(int * = 0, int = 0);
 126 };