contrib/groff-1.19/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
  41 struct 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
  52 class font;
  53
  54 struct font_pointer_list {
  55   font *p;
  56   font_pointer_list *next;
  57
  58   font_pointer_list(font *, font_pointer_list *);
  59 };
  60
  61 class printer {
  62 public:
  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
  89 protected:
  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
 101 private:
 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
 107 printer *make_printer();