lily/include/grace-fixup.hh

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2004--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef GRACE_FIXUP_HH
  21 #define GRACE_FIXUP_HH
  22
  23 #include "moment.hh"
  24
  25 /*
  26   This is a lookahead list for grace notes.
  27
  28   {  ... X \grace Y  Z ... }
  29
  30   normally, the ending of X is the start of Z. In case of a grace
  31   note, we take off a little at the end of X. What is stored: START
  32   (start point of X), LENGTH (length of X), GRACE_START (start_music
  33   of Y), and the next fixup element.
  34
  35   This is also done for nested musics, i.e.
  36
  37   voiceA = \notes { \grace b16 c'2 }
  38   voiceB = \notes { c'2 \voiceA }
  39
  40   the iterator for voiceB will contain a fixup entry with (START = 0/1,
  41   LENGTH =2/1, GRACE_START =(0G-1/16) )
  42
  43   Graces at the start of a sequential music iterator are handled
  44   by initting here_mom_ with Music::start_music (); no fixups are needed.
  45 */
  46 struct Grace_fixup
  47 {
  48   Moment start_;
  49   Moment length_;
  50
  51   Rational grace_start_;
  52
  53   Grace_fixup *next_;
  54 };
  55
  56 #endif /* GRACE_FIXUP_HH */
  57