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      1 /*	$NetBSD: font.h,v 1.1.1.1 2016/01/13 18:41:48 christos Exp $	*/
      2 
      3 // -*- C++ -*-
      4 /* Copyright (C) 1989, 1990, 1991, 1992, 2002, 2004
      5    Free Software Foundation, Inc.
      6      Written by James Clark (jjc (at) 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 };
    127