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

   1 /*      $NetBSD$        */
   2
   3 // -*- C++ -*-
   4
   5 // <groff_src_dir>/src/include/printer.h
   6
   7 /* Copyright (C) 1989, 1990, 1991, 1992, 2001, 2002, 2003, 2004
   8    Free Software Foundation, Inc.
   9
  10    Written by James Clark (jjc@jclark.com)
  11
  12    Last update: 15 Dec 2004
  13
  14    This file is part of groff.
  15
  16    groff is free software; you can redistribute it and/or modify it
  17    under the terms of the GNU General Public License as published by
  18    the Free Software Foundation; either version 2, or (at your option)
  19    any later version.
  20
  21    groff is distributed in the hope that it will be useful, but
  22    WITHOUT ANY WARRANTY; without even the implied warranty of
  23    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  24    General Public License for more details.
  25
  26    You should have received a copy of the GNU General Public License
  27    along with groff; see the file COPYING.  If not, write to the Free
  28    Software Foundation, 51 Franklin St - Fifth Floor, Boston, MA
  29    02110-1301, USA.
  30 */
  31
  32 /* Description
  33
  34    The class `printer' performs the postprocessing.  Each
  35    postprocessor only needs to implement a derived class of `printer' and
  36    a suitable function `make_printer' for the device-dependent tasks.
  37    Then the methods of class `printer' are called automatically by
  38    `do_file()' in `input.cpp'.
  39 */
  40
  41 #include "color.h"
  42
  43 struct environment {
  44   int fontno;
  45   int size;
  46   int hpos;
  47   int vpos;
  48   int height;
  49   int slant;
  50   color *col;
  51   color *fill;
  52 };
  53
  54 class font;
  55
  56 struct font_pointer_list {
  57   font *p;
  58   font_pointer_list *next;
  59
  60   font_pointer_list(font *, font_pointer_list *);
  61 };
  62
  63 class printer {
  64 public:
  65   printer();
  66   virtual ~printer();
  67   void load_font(int i, const char *name);
  68   void set_ascii_char(unsigned char c, const environment *env,
  69                       int *widthp = 0);
  70   void set_special_char(const char *nm, const environment *env,
  71                         int *widthp = 0);
  72   virtual void set_numbered_char(int n, const environment *env,
  73                                  int *widthp = 0);
  74   int set_char_and_width(const char *nm, const environment *env,
  75                          int *widthp, font **f);
  76   font *get_font_from_index(int fontno);
  77   virtual void draw(int code, int *p, int np, const environment *env);
  78   // perform change of line color (text, outline) in the print-out
  79   virtual void change_color(const environment * const env);
  80   // perform change of fill color in the print-out
  81   virtual void change_fill_color(const environment * const env);
  82   virtual void begin_page(int) = 0;
  83   virtual void end_page(int page_length) = 0;
  84   virtual font *make_font(const char *nm);
  85   virtual void end_of_line();
  86   virtual void special(char *arg, const environment *env,
  87                        char type = 'p');
  88   virtual void devtag(char *arg, const environment *env,
  89                       char type = 'p');
  90
  91 protected:
  92   font_pointer_list *font_list;
  93   font **font_table;
  94   int nfonts;
  95
  96   // information about named characters
  97   int is_char_named;
  98   int is_named_set;
  99   char named_command;
 100   const char *named_char_s;
 101   int named_char_n;
 102
 103 private:
 104   font *find_font(const char *);
 105   virtual void set_char(int index, font *f, const environment *env,
 106                         int w, const char *name) = 0;
 107 };
 108
 109 printer *make_printer();