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