lib/duration-convert.cc

   1 /*
   2   duration-convert.cc -- implement Duration_convert
   3
   4   source file of the LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8 #include <assert.h>
   9 #include "duration-convert.hh"
  10 #include "warn.hh"
  11
  12 // statics Duration_convert
  13 bool const Duration_convert::midi_as_plet_b_s = true;
  14 bool Duration_convert::no_quantify_b_s = false;
  15 bool Duration_convert::no_double_dots_b_s = false;
  16 bool Duration_convert::no_triplets_b_s = false;
  17 int Duration_convert::no_smaller_than_i_s = 0;
  18 Array<Duration> Duration_convert::dur_array_s;
  19
  20 String
  21 Duration_convert::dur2_str( Duration dur )
  22 {
  23         if ( dur.ticks_i_ )
  24                 return String( "["  ) + String( dur.ticks_i_ ) + "]";
  25
  26         String str( dur.type_i_ );
  27         str += String( '.', dur.dots_i_ );
  28         if ( dur.plet_b())
  29                 str += String( "*" ) + String( dur.plet_.iso_i_ )
  30                         + String( "/" ) + String( dur.plet_.type_i_ );
  31         return str;
  32 }
  33
  34 #if 0
  35 int
  36 Duration_convert::dur2_i( Duration dur, int division_1_i )
  37 {
  38         return dur2_mom( dur ) * Moment( division_1_i );
  39 }
  40 #endif
  41
  42 int
  43 Duration_convert::dur2ticks_i( Duration dur )
  44 {
  45         if ( dur.ticks_i_ )
  46                 return dur.ticks_i_;
  47         return dur2_mom( dur ) * Moment( Duration::division_1_i_s );
  48 }
  49
  50 Moment
  51 Duration_convert::dur2_mom( Duration dur )
  52 {
  53         if ( dur.ticks_i_ )
  54                 return Moment( dur.ticks_i_, Duration::division_1_i_s );
  55
  56         // or simply assert?
  57         if ( !dur.type_i_ )
  58                 return Moment( 0 );
  59
  60         Moment mom = Moment( 1 , dur.type_i_ );
  61
  62         Moment delta = mom;
  63         while ( dur.dots_i_-- ) {
  64                 delta /= 2.0;
  65                 mom += delta;
  66         }
  67
  68         return mom * plet_factor_mom( dur );
  69 }
  70
  71 #if 0
  72 Moment
  73 Duration_convert::i2_mom( int time_i, int division_1_i )
  74 {
  75         if ( !time_i )
  76                 return Moment( 0 );
  77
  78         if ( division_1_i > 0 )
  79                 return Moment( time_i, division_1_i );
  80         else
  81                 return Moment( -division_1_i, time_i );
  82 }
  83 #endif
  84
  85 Duration
  86 Duration_convert::mom2_dur( Moment mom )
  87 {
  88     if (!mom) {
  89         Duration dur;
  90         dur.set_plet(0,1);
  91         return dur;
  92     }
  93
  94
  95         Duration dur = mom2standardised_dur( mom );
  96 //      if ( dur.mom() == mom )
  97         if ( dur.length() == mom )
  98                 return dur;
  99         assert( midi_as_plet_b_s );
 100
 101 //      dur.set_plet( type_mom, Duration::division_1_i_s / 4 );
 102
 103 //      Moment as_plet_mom = mom / dur.mom();
 104         Moment as_plet_mom = mom / dur.length();
 105         as_plet_mom *= dur.plet_.mom();
 106         long num = as_plet_mom.numerator().as_long();
 107         long den = as_plet_mom.denominator().as_long();
 108         dur.set_plet( num, den );
 109         return dur;
 110 }
 111
 112 Duration
 113 Duration_convert::mom2standardised_dur( Moment mom )
 114 {
 115 //      if ( !dur_array_s.length_i() )
 116         if ( !dur_array_s.size() )
 117                 set_array();
 118 //      assert( dur_array_s.length_i() );
 119         assert( dur_array_s.size() );
 120 //      for ( int i = 0; i < dur_array_s.length_i() - 1; i++ ) {
 121         for ( int i = 0; i < dur_array_s.size() - 1; i++ ) {
 122                 Moment lower_mom = dur2_mom( dur_array_s[ i ] );
 123                 if ( mom <= lower_mom ) {
 124                         if ( i || ( mom / lower_mom > Moment( 3, 4 ) ) )
 125                                 return dur_array_s[ i ];
 126                         else
 127                                 return Duration( 0 );
 128                 }
 129                 Moment upper_mom = dur2_mom( dur_array_s[ i + 1 ] );
 130                 if ( ( mom < upper_mom )
 131                          && ( ( mom - lower_mom ) / mom
 132                                 < ( upper_mom - mom ) / mom ) )
 133                         return dur_array_s[ i ];
 134         }
 135 //      return dur_array_s[ dur_array_s.length_i() ];
 136         return dur_array_s[ dur_array_s.size() - 1 ];
 137 }
 138
 139 void
 140 Duration_convert::set_array()
 141 {
 142         dur_array_s.clear();
 143
 144         Duration_iterator iter_dur;
 145         assert( iter_dur );
 146         while ( iter_dur )
 147                 dur_array_s.push( iter_dur++ );
 148 }
 149
 150
 151 Moment
 152 Duration_convert::plet_factor_mom( Duration dur )
 153 {
 154         return dur.plet_.mom();
 155 }
 156
 157 Real
 158 Duration_convert::sync_f( Duration dur, Moment mom )
 159 {
 160         return mom / dur2_mom( dur );
 161 }
 162
 163 Duration
 164 Duration_convert::ticks2_dur( int ticks_i )
 165 {
 166 //              Duration dur( 4, 0 );
 167 //              dur.set_plet( ticks_i, Duration::division_1_i_s / 4 );
 168
 169         Moment mom( ticks_i, Duration::division_1_i_s );
 170         if ( midi_as_plet_b_s )
 171                 return mom2_dur( mom );
 172
 173         Duration dur = mom2standardised_dur( mom );
 174
 175 //      if ( dur.mom() == mom )
 176         if ( dur.length() == mom )
 177                 return dur;
 178
 179 // huh?
 180 #if 0
 181         dur.type_i_ = 0;
 182         dur.dots_i_ = 0;
 183         dur.set_ticks( ticks_i );
 184         return dur;
 185 #else
 186         return mom2_dur( mom );
 187 #endif
 188 }
 189
 190 Duration
 191 Duration_convert::ticks2standardised_dur( int ticks_i )
 192 {
 193         Moment mom( ticks_i, Duration::division_1_i_s );
 194         Duration dur = mom2standardised_dur( mom );
 195
 196 //      if ( dur.mom() != mom )
 197         if ( dur.length() != mom )
 198                 warning( String( "duration not exact: " ) + String( (Real)mom ) );
 199         return dur;
 200 }
 201
 202 Duration_iterator::Duration_iterator()
 203 {
 204         cursor_dur_.type_i_ = 128;
 205         if ( Duration_convert::no_smaller_than_i_s )
 206                 cursor_dur_.type_i_ = Duration_convert::no_smaller_than_i_s;
 207 //      cursor_dur_.set_plet( 1, 1 );
 208 }
 209
 210 Duration
 211 Duration_iterator::operator ++(int)
 212 {
 213         return forward_dur();
 214 }
 215
 216 Duration
 217 Duration_iterator::operator ()()
 218 {
 219         return dur();
 220 }
 221
 222 Duration_iterator::operator bool()
 223 {
 224         return ok();
 225 }
 226
 227 Duration
 228 Duration_iterator::dur()
 229 {
 230         return cursor_dur_;
 231 }
 232
 233 Duration
 234 Duration_iterator::forward_dur()
 235 {
 236         /* should do smart table? guessing:
 237                 duration wholes
 238                 16      0.0625
 239                 32..    0.0703
 240                 8:2/3   0.0833
 241                 16.     0.0938
 242                 8       0.1250
 243                 16..    0.1406
 244                 4:2/3   0.1667
 245                 8.      0.1875
 246
 247         */
 248         assert( ok() );
 249
 250         Duration dur = cursor_dur_;
 251
 252         if ( !cursor_dur_.dots_i_ && !cursor_dur_.plet_b() ) {
 253                 cursor_dur_.type_i_ *= 2;
 254                 cursor_dur_.dots_i_ = 2;
 255         }
 256         else if ( cursor_dur_.dots_i_ == 2 ) {
 257                 assert( !cursor_dur_.plet_b() );
 258                 cursor_dur_.dots_i_ = 0;
 259                 cursor_dur_.type_i_ /= 4;
 260                 cursor_dur_.set_plet( 2, 3 );
 261         }
 262         else if ( cursor_dur_.plet_b()
 263                 && ( cursor_dur_.plet_.iso_i_ == 2 )
 264                 && ( cursor_dur_.plet_.type_i_ == 3 ) ) {
 265                 assert( !cursor_dur_.dots_i_ );
 266                 cursor_dur_.set_plet( 1, 1 );
 267                 cursor_dur_.type_i_ *= 2;
 268                 cursor_dur_.dots_i_ = 1;
 269         }
 270         else if ( cursor_dur_.dots_i_ == 1 ) {
 271                 assert( !cursor_dur_.plet_b() );
 272                 cursor_dur_.dots_i_ = 0;
 273                 cursor_dur_.type_i_ /= 2;
 274         }
 275
 276         if ( Duration_convert::no_triplets_b_s
 277              && cursor_dur_.plet_b() && ok() )
 278             forward_dur();
 279         if ( Duration_convert::no_double_dots_b_s
 280              && ( cursor_dur_.dots_i_ == 2 ) && ok() )
 281                 forward_dur();
 282         if ( Duration_convert::no_smaller_than_i_s
 283              && ( cursor_dur_.type_i_ > Duration_convert::no_smaller_than_i_s ) && ok() )
 284                 forward_dur();
 285         if ( Duration_convert::no_smaller_than_i_s
 286              && cursor_dur_.dots_i_
 287              && ( cursor_dur_.type_i_ >= Duration_convert::no_smaller_than_i_s )
 288              && ok() )
 289                 forward_dur();
 290         if ( Duration_convert::no_smaller_than_i_s
 291              && ( cursor_dur_.dots_i_ == 2 )
 292              && ( cursor_dur_.type_i_ >= Duration_convert::no_smaller_than_i_s / 2 )
 293              && ok() )
 294                 forward_dur();
 295
 296         return dur;
 297 }
 298
 299 bool
 300 Duration_iterator::ok()
 301 {
 302         return ( cursor_dur_.type_i_
 303                 && !( ( cursor_dur_.type_i_ == 1 ) && ( cursor_dur_.dots_i_ > 2 ) ) );
 304 }