lily/system.cc

   1 /*
   2   system.cc -- implement System
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "input-smob.hh"
  10 #include "axis-group-interface.hh"
  11 #include "warn.hh"
  12 #include "system.hh"
  13 #include "main.hh"
  14 #include "paper-column.hh"
  15 #include "paper-def.hh"
  16 #include "paper-outputter.hh"
  17 #include "paper-score.hh"
  18 #include "string.hh"
  19 #include "warn.hh"
  20 #include "dimensions.hh"
  21 #include "molecule.hh"
  22 #include "all-font-metrics.hh"
  23 #include "spacing-interface.hh"
  24
  25 // todo: use map.
  26 void
  27 fixup_refpoints (SCM s)
  28 {
  29   for (; gh_pair_p (s); s = ly_cdr (s))
  30     {
  31       Grob::fixup_refpoint (ly_car (s));
  32     }
  33 }
  34
  35
  36 System::System (SCM s)
  37   : Spanner (s)
  38 {
  39   rank_ = 0;
  40 }
  41
  42 int
  43 System::element_count () const
  44 {
  45   return scm_ilength (get_grob_property ("all-elements"));
  46 }
  47
  48 int
  49 System::spanner_count () const
  50 {
  51   int k =0;
  52   for (SCM s = get_grob_property ("all-elements");
  53        gh_pair_p (s); s = ly_cdr (s))
  54     {
  55       if (dynamic_cast<Spanner*> (unsmob_grob (gh_car(s))))
  56         k++;
  57     }
  58
  59   return k;
  60 }
  61
  62
  63
  64 void
  65 System::typeset_grob (Grob * elem)
  66 {
  67   elem->pscore_ = pscore_;
  68   Pointer_group_interface::add_grob (this, ly_symbol2scm ("all-elements"),elem);
  69   scm_gc_unprotect_object (elem->self_scm ());
  70 }
  71
  72 void
  73 System::output_lines ()
  74 {
  75   for (SCM s = get_grob_property ("all-elements");
  76        gh_pair_p (s); s = ly_cdr (s))
  77     {
  78       Grob * g = unsmob_grob (ly_car (s));
  79       if (Spacing_interface::has_interface (g))
  80         {
  81           /*
  82             Kill no longer needed grobs.
  83            */
  84           Item * it = dynamic_cast<Item*> (g);
  85           if (it && Item::breakable_b(it))
  86             {
  87               it->find_prebroken_piece (LEFT)->suicide();
  88               it->find_prebroken_piece (RIGHT)->suicide();
  89             }
  90           g->suicide ();
  91         }
  92       else if (g->live ())
  93         g->do_break_processing ();
  94     }
  95
  96   /*
  97     fixups must be done in broken line_of_scores, because new elements
  98     are put over there.  */
  99   int count = 0;
 100   for (int i=0; i < broken_intos_.size (); i++)
 101     {
 102       Grob *se = broken_intos_[i];
 103       SCM all = se->get_grob_property ("all-elements");
 104       for (SCM s = all; gh_pair_p (s); s = ly_cdr (s))
 105         {
 106           fixup_refpoint (ly_car (s));
 107         }
 108       count += scm_ilength (all);
 109     }
 110
 111   /*
 112     needed for doing items.
 113    */
 114   fixup_refpoints (get_grob_property ("all-elements"));
 115
 116
 117   for (SCM s = get_grob_property ("all-elements");
 118        gh_pair_p (s); s = ly_cdr (s))
 119     {
 120       unsmob_grob (ly_car (s))->handle_broken_dependencies ();
 121     }
 122   handle_broken_dependencies ();
 123
 124   if (verbose_global_b)
 125     progress_indication (_f ("Element count %d.",  count + element_count ()));
 126
 127
 128   for (int i=0; i < broken_intos_.size (); i++)
 129     {
 130       System *system = dynamic_cast<System*> (broken_intos_[i]);
 131
 132       if (verbose_global_b)
 133         progress_indication ("[");
 134       system->post_processing (i+1 == broken_intos_.size ());
 135
 136       if (verbose_global_b)
 137         {
 138           progress_indication (to_string (i));
 139           progress_indication ("]");
 140         }
 141
 142       if (i < broken_intos_.size () - 1)
 143         {
 144           SCM lastcol =  ly_car (system->get_grob_property ("columns"));
 145           Grob*  e = unsmob_grob (lastcol);
 146
 147           SCM between = ly_symbol2scm ("between-system-string");
 148           SCM inter = e->internal_get_grob_property (between);
 149           if (gh_string_p (inter))
 150             {
 151               pscore_->outputter_
 152                 ->output_scheme (scm_list_n (between,
 153                                              inter, SCM_UNDEFINED));
 154             }
 155         }
 156     }
 157 }
 158
 159
 160
 161
 162 /*
 163   Find the loose columns in POSNS, and drape them around the columns
 164   specified in BETWEEN-COLS.  */
 165 void
 166 set_loose_columns (System* which, Column_x_positions const *posns)
 167 {
 168   for (int i = 0; i < posns->loose_cols_.size (); i++)
 169     {
 170       int divide_over = 1;
 171       Item *loose = dynamic_cast<Item*> (posns->loose_cols_[i]);
 172       Paper_column* col = dynamic_cast<Paper_column*> (loose);
 173
 174       if (col->system_)
 175         continue;
 176
 177
 178       Item * left = 0;
 179       Item * right = 0;
 180       do
 181         {
 182           SCM between = loose->get_grob_property ("between-cols");
 183           if (!gh_pair_p (between))
 184             break;
 185
 186
 187           Item * l=dynamic_cast<Item*> (unsmob_grob (ly_car (between)));
 188           Item * r=dynamic_cast<Item*> (unsmob_grob (ly_cdr (between)));
 189
 190           if (!(l && r))
 191             break ;
 192
 193           if (!left && l)
 194             {
 195               left = l->get_column ();
 196             }
 197
 198           divide_over ++;
 199
 200           loose = right = r->get_column ();
 201         }
 202       while (1);
 203
 204
 205 #if 0
 206       Real rx = right->relative_coordinate (right->get_parent (X_AXIS), X_AXIS);
 207       Real lx = left->relative_coordinate (left->get_parent (X_AXIS), X_AXIS);
 208
 209       /*
 210         divide space equally over loose columns.
 211        */
 212       int j = 1;
 213       loose = col;
 214       while (1)
 215         {
 216           SCM between = loose->get_grob_property ("between-cols");
 217           if (!gh_pair_p (between))
 218             break;
 219
 220           Paper_column *thiscol = dynamic_cast<Paper_column*> (loose);
 221
 222           thiscol->system_ = which;
 223           thiscol->translate_axis (lx + j*(rx - lx)/divide_over, X_AXIS);
 224
 225           j ++;
 226           loose = dynamic_cast<Item*> (unsmob_grob (ly_cdr (between)));
 227         }
 228 #else
 229       /*
 230         We divide the remaining space of the column over the left and
 231         right side. At the moment, we
 232
 233       */
 234       Grob * common = right->common_refpoint (left, X_AXIS);
 235
 236       Real rx = right->extent(common, X_AXIS)[LEFT];
 237       Real lx =  left->extent(common, X_AXIS)[RIGHT];
 238       Real total_dx = rx - lx;
 239       Interval cval =col->extent (col, X_AXIS);
 240
 241       /*
 242
 243         We put it in the middle. This is not an ideal solution -- the
 244         break alignment code inserts a fixed space before the clef
 245         (about 1 SS), while the space following the clef is
 246         flexible. In tight situations, the clef will almost be on top
 247         of the following note.
 248
 249       */
 250       Real dx = rx-lx - cval.length ();
 251       if (total_dx < 2* cval.length ())
 252         {
 253           /*
 254             todo: this is discontinuous. I'm too tired to
 255             invent a sliding mechanism. Duh.
 256
 257             TODO.
 258            */
 259           dx *= 0.25;
 260         }
 261       else
 262         dx *= 0.5;
 263
 264       col->system_ = which;
 265       col->translate_axis (lx + dx - cval[LEFT], X_AXIS);
 266 #endif
 267     }
 268 }
 269
 270 // const?
 271 void
 272 System::break_into_pieces (Array<Column_x_positions> const &breaking)
 273 {
 274   for (int i=0; i < breaking.size (); i++)
 275     {
 276       System *system = dynamic_cast <System*> (clone ());
 277       system->rank_ = i;
 278
 279       Link_array<Grob> c (breaking[i].cols_);
 280       pscore_->typeset_line (system);
 281
 282       system->set_bound (LEFT,c[0]);
 283       system->set_bound (RIGHT,c.top ());
 284       for (int j=0; j < c.size (); j++)
 285         {
 286           c[j]->translate_axis (breaking[i].config_[j],X_AXIS);
 287           dynamic_cast<Paper_column*> (c[j])->system_ = system;
 288         }
 289       set_loose_columns (system, &breaking[i]);
 290       broken_intos_.push (system);
 291     }
 292 }
 293
 294
 295 void
 296 System::output_molecule (SCM expr, Offset o)
 297 {
 298
 299   while (1)
 300     {
 301       if (!gh_pair_p (expr))
 302         return;
 303
 304       SCM head =ly_car (expr);
 305       if (unsmob_input (head))
 306         {
 307           Input * ip = unsmob_input (head);
 308
 309           pscore_->outputter_->output_scheme (scm_list_n (ly_symbol2scm ("define-origin"),
 310                                                            scm_makfrom0str (ip->file_string ().to_str0 ()),
 311                                                            gh_int2scm (ip->line_number ()),
 312                                                            gh_int2scm (ip->column_number ()),
 313                                                            SCM_UNDEFINED));
 314           expr = ly_cadr (expr);
 315         }
 316       else  if (head ==  ly_symbol2scm ("no-origin"))
 317         {
 318           pscore_->outputter_->output_scheme (scm_list_n (head, SCM_UNDEFINED));
 319           expr = ly_cadr (expr);
 320         }
 321       else if (head == ly_symbol2scm ("translate-molecule"))
 322         {
 323           o += ly_scm2offset (ly_cadr (expr));
 324           expr = ly_caddr (expr);
 325         }
 326       else if (head == ly_symbol2scm ("combine-molecule"))
 327         {
 328           output_molecule (ly_cadr (expr), o);
 329           expr = ly_caddr (expr);
 330         }
 331       else
 332         {
 333           pscore_->outputter_->
 334             output_scheme (scm_list_n (ly_symbol2scm ("placebox"),
 335                                     gh_double2scm (o[X_AXIS]),
 336                                     gh_double2scm (o[Y_AXIS]),
 337                                     expr,
 338                                     SCM_UNDEFINED));
 339
 340           return;
 341         }
 342     }
 343 }
 344
 345 void
 346 System::output_scheme (SCM s)
 347 {
 348   pscore_->outputter_->output_scheme (s);
 349 }
 350
 351 void
 352 System::add_column (Paper_column*p)
 353 {
 354   Grob *me = this;
 355   SCM cs = me->get_grob_property ("columns");
 356   Grob * prev =  gh_pair_p (cs) ? unsmob_grob (ly_car (cs)) : 0;
 357
 358   p->rank_ = prev ? Paper_column::get_rank (prev) + 1 : 0;
 359
 360   me->set_grob_property ("columns",  gh_cons (p->self_scm (), cs));
 361
 362   Axis_group_interface::add_element (me, p);
 363 }
 364
 365
 366
 367 /*
 368   TODO: use scm_map iso. for loops.
 369  */
 370 void
 371 System::pre_processing ()
 372 {
 373   for (SCM s = get_grob_property ("all-elements"); gh_pair_p (s); s = ly_cdr (s))
 374     unsmob_grob (ly_car (s))->discretionary_processing ();
 375
 376   if (verbose_global_b)
 377     progress_indication (_f ("Grob count %d ",  element_count ()));
 378
 379
 380   for (SCM s = get_grob_property ("all-elements"); gh_pair_p (s); s = ly_cdr (s))
 381     unsmob_grob (ly_car (s))->handle_prebroken_dependencies ();
 382
 383   fixup_refpoints (get_grob_property ("all-elements"));
 384
 385   for (SCM s = get_grob_property ("all-elements"); gh_pair_p (s); s = ly_cdr (s))
 386     {
 387       Grob* sc = unsmob_grob (ly_car (s));
 388       sc->calculate_dependencies (PRECALCED, PRECALCING, ly_symbol2scm ("before-line-breaking-callback"));
 389     }
 390
 391   progress_indication ("\n" + _ ("Calculating line breaks...") + " ");
 392   for (SCM s = get_grob_property ("all-elements"); gh_pair_p (s); s = ly_cdr (s))
 393     {
 394       Grob * e = unsmob_grob (ly_car (s));
 395       SCM proc = e->get_grob_property ("spacing-procedure");
 396       if (gh_procedure_p (proc))
 397         gh_call1 (proc, e->self_scm ());
 398     }
 399 }
 400
 401 void
 402 System::post_processing (bool last_line)
 403 {
 404   for (SCM s = get_grob_property ("all-elements");
 405        gh_pair_p (s); s = ly_cdr (s))
 406     {
 407       Grob* sc = unsmob_grob (ly_car (s));
 408       sc->calculate_dependencies (POSTCALCED, POSTCALCING,
 409                                   ly_symbol2scm ("after-line-breaking-callback"));
 410     }
 411
 412   Interval i (extent (this, Y_AXIS));
 413   if (i.empty_b ())
 414     programming_error ("Huh?  Empty System?");
 415   else
 416     translate_axis (- i[MAX], Y_AXIS);
 417
 418   Real height = i.length ();
 419   if (height > 50 CM)
 420     {
 421       programming_error ("Improbable system height");
 422       height = 50 CM;
 423     }
 424
 425   /*
 426     generate all molecules  to trigger all font loads.
 427
 428     (ugh. This is not very memory efficient.)  */
 429   this->get_molecule();
 430   for (SCM s = get_grob_property ("all-elements"); gh_pair_p (s); s = ly_cdr (s))
 431     {
 432       unsmob_grob (ly_car (s))->get_molecule ();
 433     }
 434   /*
 435     font defs;
 436    */
 437   SCM font_names = ly_quote_scm (get_paper ()->font_descriptions ());
 438   output_scheme (scm_list_n (ly_symbol2scm ("define-fonts"),
 439                              font_names,
 440                              SCM_UNDEFINED));
 441
 442   /*
 443     line preamble.
 444    */
 445   Interval j (extent (this, X_AXIS));
 446   Real length = j[RIGHT];
 447
 448   output_scheme (scm_list_n (ly_symbol2scm ("start-system"),
 449                           gh_double2scm (length),
 450                           gh_double2scm (height),
 451                           SCM_UNDEFINED));
 452
 453   /* Output elements in three layers, 0, 1, 2.
 454      The default layer is 1. */
 455
 456   {
 457     Molecule *m = this->get_molecule();
 458     if (m)
 459       output_molecule (m->get_expr (), Offset(0,0));
 460   }
 461
 462   for (int i = 0; i < 3; i++)
 463     for (SCM s = get_grob_property ("all-elements"); gh_pair_p (s);
 464          s = ly_cdr (s))
 465       {
 466         Grob *sc = unsmob_grob (ly_car (s));
 467         Molecule *m = sc->get_molecule ();
 468         if (!m)
 469           continue;
 470
 471         SCM s = sc->get_grob_property ("layer");
 472         int layer = gh_number_p (s) ? gh_scm2int (s) : 1;
 473         if (layer != i)
 474           continue;
 475
 476         Offset o (sc->relative_coordinate (this, X_AXIS),
 477                   sc->relative_coordinate (this, Y_AXIS));
 478
 479         SCM e = sc->get_grob_property ("extra-offset");
 480         if (gh_pair_p (e))
 481           {
 482             o[X_AXIS] += gh_scm2double (ly_car (e));
 483             o[Y_AXIS] += gh_scm2double (ly_cdr (e));
 484           }
 485
 486         output_molecule (m->get_expr (), o);
 487       }
 488
 489
 490
 491   if (last_line)
 492     {
 493       output_scheme (scm_list_n (ly_symbol2scm ("stop-last-system"), SCM_UNDEFINED));
 494     }
 495   else
 496     {
 497       output_scheme (scm_list_n (ly_symbol2scm ("stop-system"), SCM_UNDEFINED));
 498     }
 499 }
 500
 501
 502 Link_array<Item>
 503 System::broken_col_range (Item const*l, Item const*r) const
 504 {
 505   Link_array<Item> ret;
 506
 507   l = l->get_column ();
 508   r = r->get_column ();
 509   SCM s = get_grob_property ("columns");
 510
 511   while (gh_pair_p (s) && ly_car (s) != r->self_scm ())
 512     s = ly_cdr (s);
 513
 514   if (gh_pair_p (s))
 515     s = ly_cdr (s);
 516
 517   while (gh_pair_p (s) && ly_car (s) != l->self_scm ())
 518     {
 519       Paper_column*c = dynamic_cast<Paper_column*> (unsmob_grob (ly_car (s)));
 520       if (Item::breakable_b (c) && !c->system_)
 521         ret.push (c);
 522
 523       s = ly_cdr (s);
 524     }
 525
 526   ret.reverse ();
 527   return ret;
 528 }
 529
 530 /**
 531    Return all columns, but filter out any unused columns , since they might
 532    disrupt the spacing problem.
 533  */
 534 Link_array<Grob>
 535 System::columns ()const
 536 {
 537   Link_array<Grob> acs
 538     = Pointer_group_interface__extract_grobs (this, (Grob*) 0, "columns");
 539   bool bfound = false;
 540   for (int i= acs.size (); i -- ;)
 541     {
 542       bool brb = Item::breakable_b (acs[i]);
 543       bfound = bfound || brb;
 544
 545       /*
 546         the last column should be breakable. Weed out any columns that
 547         seem empty. We need to retain breakable columns, in case
 548         someone forced a breakpoint.
 549       */
 550       if (!bfound || !Paper_column::used_b (acs[i]))
 551         acs.del (i);
 552     }
 553   return acs;
 554 }
 555
 556
 557
 558
 559 ADD_INTERFACE (System,"system-interface",
 560   "Super grob, parent of all: "
 561 "\n\n"
 562 "The columns of a score that form one line.  The toplevel grob.  Any "
 563 "grob has a Line_of_score as both X and Y reference point. The "
 564 "Paper_score contains one grob of this type. Control enters the "
 565 "Grob dependency calculation from this single Line_of_score "
 566 "object.",
 567   "between-system-string all-elements columns");