src/FontInfo.h

   1 // -*- C++ -*-
   2 /* This file is part of
   3  * ======================================================
   4  *
   5  *           LyX, The Document Processor
   6  *
   7  *          Copyright (C) 1997 Asger Alstrup
   8  *           and the LyX Team.
   9  *
  10  *======================================================*/
  11
  12 #ifndef _FONTINFO_H_
  13 #define _FONTINFO_H_
  14
  15 #ifdef __GNUG__
  16 #pragma interface
  17 #endif
  18
  19 #include "LString.h"
  20
  21 /** This class manages a font.
  22 The idea is to create a FontInfo object with a font name pattern with a
  23 wildcard at the size field. Then this object can host request for font-
  24 instances of any given size. If no exact match is found, the closest size
  25 is chosen instead. If the font is scalable, the flag lyxrc->use_scalable_fonts
  26 determines whether to allow scalable fonts to give an exact match. */
  27 class FontInfo {
  28 public:
  29         ///
  30         FontInfo() { init(); }
  31
  32         ///
  33         FontInfo(string const & pat)
  34         : pattern(pat) { init(); }
  35
  36         /// Destructor
  37         ~FontInfo() { release(); }
  38
  39         /// Does any font match our pattern?
  40         bool exist() {
  41                 query();
  42                 return matches != 0;
  43         }
  44
  45         /// Is this font scalable?
  46         bool isScalable() {
  47                 query();
  48                 return scalable;
  49         }
  50
  51         /// Get existing pattern
  52         string getPattern() const { return pattern; }
  53
  54         /// Set new pattern
  55         void setPattern(string const & pat);
  56
  57         /** Return full name of font close to this size.
  58           If impossible, result is the empty string */
  59         string getFontname(int size);
  60 private:
  61         /// Font pattern (with wildcard for size)
  62         string pattern;
  63
  64         /// Available size list
  65         int * sizes;
  66
  67         /// Corresponding name list
  68         string * strings;
  69
  70         /// Number of matches
  71         int matches;
  72
  73         /// Did we query X about this font?
  74         bool queried;
  75
  76         /// Is this font scalable?
  77         bool scalable;
  78
  79         /// Which index points to scalable font entry?
  80         int scaleindex;
  81
  82         /// Initialize empty record
  83         void init()
  84         {
  85                 sizes = 0;
  86                 strings = 0;
  87                 matches = 0;
  88                 queried = false;
  89                 scalable = false;
  90                 scaleindex = -1;
  91         }
  92
  93         /// Release allocated stuff
  94         void release();
  95
  96         /// Ask X11 about this font pattern
  97         void query();
  98
  99         /// Build newly sized font string
 100         string resize(string const &, int size) const;
 101 };
 102 #endif