src/FontIterator.h

   1 // -*- C++ -*-
   2 /**
   3  * \file src/FontIterator.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author Alfredo Braunstein
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  *
  11  *
  12  * Calling Text::getFont is slow. While rebreaking we scan a
  13  * paragraph from left to right calling getFont for every char.  This
  14  * simple class address this problem by hidding an optimization trick
  15  * (not mine btw -AB): the font is reused in the whole font span.  The
  16  * class handles transparently the "hidden" (not part of the fontlist)
  17  * label font (as getFont does).
  18  */
  19
  20 #ifndef FONTITERATOR_H
  21 #define FONTITERATOR_H
  22
  23 #include "Font.h"
  24
  25 #include "support/types.h"
  26
  27
  28 namespace lyx {
  29
  30 class Paragraph;
  31 class TextMetrics;
  32
  33
  34 class FontIterator : std::iterator<std::forward_iterator_tag, Font>
  35 {
  36 public:
  37         ///
  38         FontIterator(TextMetrics const & tm,
  39                 Paragraph const & par, pit_type pit, pos_type pos);
  40         ///
  41         Font const & operator*() const;
  42         ///
  43         FontIterator & operator++();
  44         ///
  45         Font * operator->();
  46
  47 private:
  48         ///
  49         TextMetrics const & tm_;
  50         ///
  51         Paragraph const & par_;
  52         ///
  53         pit_type pit_;
  54         ///
  55         pos_type pos_;
  56         ///
  57         Font font_;
  58         ///
  59         pos_type endspan_;
  60         ///
  61         pos_type bodypos_;
  62 };
  63
  64
  65 } // namespace lyx
  66
  67 #endif // FONTITERATOR_H