/contrib/groff/src/include/printer.h

  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();