lily/system.cc

   1 /*
   2   system.cc -- implement System
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "system.hh"
  10
  11 #include "align-interface.hh"
  12 #include "all-font-metrics.hh"
  13 #include "axis-group-interface.hh"
  14 #include "grob-array.hh"
  15 #include "hara-kiri-group-spanner.hh"
  16 #include "international.hh"
  17 #include "lookup.hh"
  18 #include "main.hh"
  19 #include "output-def.hh"
  20 #include "page-layout-problem.hh"
  21 #include "paper-column.hh"
  22 #include "paper-score.hh"
  23 #include "paper-system.hh"
  24 #include "pointer-group-interface.hh"
  25 #include "skyline-pair.hh"
  26 #include "staff-symbol-referencer.hh"
  27 #include "warn.hh"
  28
  29 System::System (System const &src)
  30   : Spanner (src)
  31 {
  32   all_elements_ = 0;
  33   pscore_ = 0;
  34   rank_ = 0;
  35   init_elements ();
  36 }
  37
  38 System::System (SCM s)
  39   : Spanner (s)
  40 {
  41   all_elements_ = 0;
  42   rank_ = 0;
  43   init_elements ();
  44 }
  45
  46 void
  47 System::init_elements ()
  48 {
  49   SCM scm_arr = Grob_array::make_array ();
  50   all_elements_ = unsmob_grob_array (scm_arr);
  51   all_elements_->set_ordered (false);
  52   set_object ("all-elements", scm_arr);
  53 }
  54
  55 Grob *
  56 System::clone () const
  57 {
  58   return new System (*this);
  59 }
  60
  61 int
  62 System::element_count () const
  63 {
  64   return all_elements_->size ();
  65 }
  66
  67 int
  68 System::spanner_count () const
  69 {
  70   int k = 0;
  71   for (vsize i = all_elements_->size (); i--;)
  72     if (dynamic_cast<Spanner *> (all_elements_->grob (i)))
  73       k++;
  74   return k;
  75 }
  76
  77 void
  78 System::typeset_grob (Grob *elem)
  79 {
  80   if (elem->layout_)
  81     programming_error ("adding element twice");
  82   else
  83     {
  84       elem->layout_ = pscore_->layout ();
  85       all_elements_->add (elem);
  86       elem->unprotect ();
  87     }
  88 }
  89
  90 void
  91 System::derived_mark () const
  92 {
  93   if (!all_elements_->empty ())
  94     {
  95       Grob **ptr = &all_elements_->array_reference ()[0];
  96       Grob **end = ptr + all_elements_->size ();
  97       while (ptr < end)
  98         {
  99           scm_gc_mark ((*ptr)->self_scm ());
 100           ptr++;
 101         }
 102     }
 103
 104   if (pscore_)
 105     scm_gc_mark (pscore_->self_scm ());
 106
 107   Spanner::derived_mark ();
 108 }
 109
 110 static void
 111 fixup_refpoints (vector<Grob*> const &grobs)
 112 {
 113   for (vsize i = grobs.size (); i--;)
 114     grobs[i]->fixup_refpoint ();
 115 }
 116
 117 void
 118 System::do_break_substitution_and_fixup_refpoints ()
 119 {
 120   for (vsize i = 0; i < all_elements_->size (); i++)
 121     {
 122       Grob *g = all_elements_->grob (i);
 123       if (g->internal_has_interface (ly_symbol2scm ("only-prebreak-interface")))
 124         {
 125           /*
 126             Kill no longer needed grobs.
 127           */
 128           Item *it = dynamic_cast<Item *> (g);
 129           if (it && Item::is_non_musical (it))
 130             {
 131               it->find_prebroken_piece (LEFT)->suicide ();
 132               it->find_prebroken_piece (RIGHT)->suicide ();
 133             }
 134           g->suicide ();
 135         }
 136       else if (g->is_live ())
 137         g->do_break_processing ();
 138     }
 139
 140   /*
 141     fixups must be done in broken line_of_scores, because new elements
 142     are put over there.  */
 143   int count = 0;
 144   for (vsize i = 0; i < broken_intos_.size (); i++)
 145     {
 146       Grob *se = broken_intos_[i];
 147
 148       extract_grob_set (se, "all-elements", all_elts);
 149       for (vsize j = 0; j < all_elts.size (); j++)
 150         {
 151           Grob *g = all_elts[j];
 152           g->fixup_refpoint ();
 153         }
 154
 155       count += all_elts.size ();
 156     }
 157
 158   /*
 159     needed for doing items.
 160   */
 161   fixup_refpoints (all_elements_->array ());
 162
 163   for (vsize i = 0; i < all_elements_->size (); i++)
 164     all_elements_->grob (i)->handle_broken_dependencies ();
 165
 166   handle_broken_dependencies ();
 167
 168   /* Because the this->get_property (all-elements) contains items in 3
 169      versions, handle_broken_dependencies () will leave duplicated
 170      items in all-elements.  Strictly speaking this is harmless, but
 171      it leads to duplicated symbols in the output.  uniq makes sure
 172      that no duplicates are in the list.  */
 173   for (vsize i = 0; i < broken_intos_.size (); i++)
 174     {
 175       System *child = dynamic_cast<System*> (broken_intos_[i]);
 176       child->all_elements_->remove_duplicates ();
 177       for (vsize j = 0; j < child->all_elements_->size (); j++)
 178         {
 179           Grob *g = child->all_elements_->grob (j);
 180
 181           (void) g->get_property ("after-line-breaking");
 182         }
 183     }
 184
 185   if (be_verbose_global)
 186     message (_f ("Element count %d", count + element_count ()) + "\n");
 187 }
 188
 189 SCM
 190 System::get_broken_system_grobs ()
 191 {
 192   SCM ret = SCM_EOL;
 193   for (vsize i = 0; i < broken_intos_.size (); i++)
 194     ret = scm_cons (broken_intos_[i]->self_scm (), ret);
 195   return scm_reverse (ret);
 196 }
 197
 198 SCM
 199 System::get_paper_systems ()
 200 {
 201   SCM lines = scm_c_make_vector (broken_intos_.size (), SCM_EOL);
 202   for (vsize i = 0; i < broken_intos_.size (); i++)
 203     {
 204       if (be_verbose_global)
 205         progress_indication ("[");
 206
 207       System *system = dynamic_cast<System *> (broken_intos_[i]);
 208
 209       scm_vector_set_x (lines, scm_from_int (i),
 210                         system->get_paper_system ());
 211
 212       if (be_verbose_global)
 213         progress_indication (to_string (i) + "]");
 214     }
 215   return lines;
 216 }
 217
 218 void
 219 System::break_into_pieces (vector<Column_x_positions> const &breaking)
 220 {
 221   for (vsize i = 0; i < breaking.size (); i++)
 222     {
 223       System *system = dynamic_cast<System *> (clone ());
 224       system->rank_ = broken_intos_.size ();
 225
 226       vector<Grob*> c (breaking[i].cols_);
 227       pscore_->typeset_system (system);
 228
 229       int st = Paper_column::get_rank (c[0]);
 230       int end = Paper_column::get_rank (c.back ());
 231       Interval iv (pure_height (this, st, end));
 232       system->set_property ("pure-Y-extent", ly_interval2scm (iv));
 233
 234       system->set_bound (LEFT, c[0]);
 235       system->set_bound (RIGHT, c.back ());
 236       SCM system_labels = SCM_EOL;
 237       for (vsize j = 0; j < c.size (); j++)
 238         {
 239           c[j]->translate_axis (breaking[i].config_[j], X_AXIS);
 240           dynamic_cast<Paper_column *> (c[j])->system_ = system;
 241           /* collect the column labels */
 242           SCM col_labels = c[j]->get_property ("labels");
 243           if (scm_is_pair (col_labels))
 244             system_labels = scm_append (scm_list_2 (col_labels, system_labels));
 245         }
 246       system->set_property ("labels", system_labels);
 247
 248       set_loose_columns (system, &breaking[i]);
 249       broken_intos_.push_back (system);
 250     }
 251 }
 252
 253 void
 254 System::add_column (Paper_column *p)
 255 {
 256   Grob *me = this;
 257   Grob_array *ga = unsmob_grob_array (me->get_object ("columns"));
 258   if (!ga)
 259     {
 260       SCM scm_ga = Grob_array::make_array ();
 261       me->set_object ("columns", scm_ga);
 262       ga = unsmob_grob_array (scm_ga);
 263     }
 264
 265   p->rank_ = ga->size ();
 266
 267   ga->add (p);
 268   Axis_group_interface::add_element (this, p);
 269 }
 270
 271 void
 272 System::pre_processing ()
 273 {
 274   for (vsize i = 0; i < all_elements_->size (); i++)
 275     all_elements_->grob (i)->discretionary_processing ();
 276
 277   if (be_verbose_global)
 278     message (_f ("Grob count %d", element_count ()));
 279
 280   /*
 281     order is significant: broken grobs are added to the end of the
 282     array, and should be processed before the original is potentially
 283     killed.
 284   */
 285   for (vsize i = all_elements_->size (); i--;)
 286     all_elements_->grob (i)->handle_prebroken_dependencies ();
 287
 288   fixup_refpoints (all_elements_->array ());
 289
 290   for (vsize i = 0; i < all_elements_->size (); i++)
 291     {
 292       Grob *g = all_elements_->grob (i);
 293       (void) g->get_property ("before-line-breaking");
 294     }
 295
 296   for (vsize i = 0; i < all_elements_->size (); i++)
 297     {
 298       Grob *e = all_elements_->grob (i);
 299       (void) e->get_property ("springs-and-rods");
 300     }
 301 }
 302
 303 void
 304 System::post_processing ()
 305 {
 306   Interval iv (extent (this, Y_AXIS));
 307   if (iv.is_empty ())
 308     programming_error ("system with empty extent");
 309   else
 310     translate_axis (-iv[MAX], Y_AXIS);
 311
 312   /* Generate all stencils to trigger font loads.
 313      This might seem inefficient, but Stencils are cached per grob
 314      anyway. */
 315
 316   vector<Grob*> all_elts_sorted (all_elements_->array ());
 317   vector_sort (all_elts_sorted, std::less<Grob*> ());
 318   uniq (all_elts_sorted);
 319   this->get_stencil ();
 320   for (vsize i = all_elts_sorted.size (); i--;)
 321     {
 322       Grob *g = all_elts_sorted[i];
 323       g->get_stencil ();
 324     }
 325 }
 326
 327 struct Layer_entry
 328 {
 329   Grob *grob_;
 330   int layer_;
 331 };
 332
 333 bool
 334 operator< (Layer_entry  const &a,
 335            Layer_entry  const &b)
 336 {
 337   return a.layer_ < b.layer_;
 338 }
 339
 340
 341 SCM
 342 System::get_paper_system ()
 343 {
 344   SCM exprs = SCM_EOL;
 345   SCM *tail = &exprs;
 346
 347   post_processing ();
 348
 349   vector<Layer_entry> entries;
 350   for (vsize j = 0; j < all_elements_->size (); j++)
 351     {
 352       Layer_entry e;
 353       e.grob_ = all_elements_->grob (j);
 354       e.layer_ = robust_scm2int (e.grob_->get_property ("layer"), 1);
 355
 356       entries.push_back (e);
 357     }
 358
 359   vector_sort (entries, std::less<Layer_entry> ());
 360   for (vsize j = 0; j < entries.size (); j++)
 361     {
 362       Grob *g = entries[j].grob_;
 363       Stencil st = g->get_print_stencil ();
 364
 365       if (st.expr () == SCM_EOL)
 366         continue;
 367
 368       Offset o;
 369       for (int a = X_AXIS; a < NO_AXES; a++)
 370         o[Axis (a)] = g->relative_coordinate (this, Axis (a));
 371
 372       Offset extra = robust_scm2offset (g->get_property ("extra-offset"),
 373                                         Offset (0, 0))
 374         * Staff_symbol_referencer::staff_space (g);
 375
 376       /* Must copy the stencil, for we cannot change the stencil
 377          cached in G.  */
 378
 379       st.translate (o + extra);
 380
 381       *tail = scm_cons (st.expr (), SCM_EOL);
 382       tail = SCM_CDRLOC (*tail);
 383     }
 384
 385   if (Stencil *me = get_stencil ())
 386     exprs = scm_cons (me->expr (), exprs);
 387
 388   Interval x (extent (this, X_AXIS));
 389   Interval y (extent (this, Y_AXIS));
 390   Stencil sys_stencil (Box (x, y),
 391                        scm_cons (ly_symbol2scm ("combine-stencil"),
 392                                  exprs));
 393   if (debug_skylines)
 394     {
 395       Skyline_pair *skylines = Skyline_pair::unsmob (get_property ("vertical-skylines"));
 396       if (skylines)
 397         {
 398           Stencil up
 399             = Lookup::points_to_line_stencil (0.1, (*skylines)[UP].to_points (X_AXIS));
 400           Stencil down
 401             = Lookup::points_to_line_stencil (0.1, (*skylines)[DOWN].to_points (X_AXIS));
 402           sys_stencil.add_stencil (up.in_color (255, 0, 0));
 403           sys_stencil.add_stencil (down.in_color (0, 255, 0));
 404         }
 405     }
 406
 407   Grob *left_bound = this->get_bound (LEFT);
 408   SCM prop_init = left_bound->get_property ("line-break-system-details");
 409   Prob *pl = make_paper_system (prop_init);
 410   paper_system_set_stencil (pl, sys_stencil);
 411
 412   /* information that the page breaker might need */
 413   Grob *right_bound = this->get_bound (RIGHT);
 414   pl->set_property ("vertical-skylines", this->get_property ("vertical-skylines"));
 415   pl->set_property ("page-break-permission", right_bound->get_property ("page-break-permission"));
 416   pl->set_property ("page-turn-permission", right_bound->get_property ("page-turn-permission"));
 417   pl->set_property ("page-break-penalty", right_bound->get_property ("page-break-penalty"));
 418   pl->set_property ("page-turn-penalty", right_bound->get_property ("page-turn-penalty"));
 419
 420   Interval staff_refpoints;
 421   extract_grob_set (this, "spaceable-staves", staves);
 422   for (vsize i = 0; i < staves.size (); i++)
 423     if (staves[i]->is_live ())
 424       staff_refpoints.add_point (staves[i]->relative_coordinate (this, Y_AXIS));
 425
 426   pl->set_property ("staff-refpoint-extent", ly_interval2scm (staff_refpoints));
 427   pl->set_property ("system-grob", this->self_scm ());
 428
 429   return pl->unprotect ();
 430 }
 431
 432 vector<Item*>
 433 System::broken_col_range (Item const *left, Item const *right) const
 434 {
 435   vector<Item*> ret;
 436
 437   left = left->get_column ();
 438   right = right->get_column ();
 439
 440
 441   extract_grob_set (this, "columns", cols);
 442
 443   vsize i = Paper_column::get_rank (left);
 444   int end_rank = Paper_column::get_rank (right);
 445   if (i < cols.size ())
 446     i++;
 447
 448   while (i < cols.size ()
 449          && Paper_column::get_rank (cols[i]) < end_rank)
 450     {
 451       Paper_column *c = dynamic_cast<Paper_column *> (cols[i]);
 452       if (Paper_column::is_breakable (c) && !c->system_)
 453         ret.push_back (c);
 454       i++;
 455     }
 456
 457   return ret;
 458 }
 459
 460
 461 /** Return all columns, but filter out any unused columns , since they might
 462     disrupt the spacing problem. */
 463 vector<Grob*>
 464 System::used_columns () const
 465 {
 466   extract_grob_set (this, "columns", ro_columns);
 467
 468   int last_breakable = ro_columns.size ();
 469
 470   while (last_breakable--)
 471     {
 472       if (Paper_column::is_breakable (ro_columns [last_breakable]))
 473         break;
 474     }
 475
 476   vector<Grob*> columns;
 477   for (int i = 0; i <= last_breakable; i++)
 478     {
 479       if (Paper_column::is_used (ro_columns[i]))
 480         columns.push_back (ro_columns[i]);
 481     }
 482
 483   return columns;
 484 }
 485
 486 Paper_column *
 487 System::column (vsize which) const
 488 {
 489   extract_grob_set (this, "columns", columns);
 490   if (which >= columns.size ())
 491     return 0;
 492
 493   return dynamic_cast<Paper_column*> (columns[which]);
 494 }
 495
 496 Paper_score*
 497 System::paper_score () const
 498 {
 499   return pscore_;
 500 }
 501
 502 int
 503 System::get_rank () const
 504 {
 505   return rank_;
 506 }
 507
 508 System *
 509 get_root_system (Grob *me)
 510 {
 511   Grob *system_grob = me;
 512
 513   while (system_grob->get_parent (Y_AXIS))
 514     system_grob = system_grob->get_parent (Y_AXIS);
 515
 516   return dynamic_cast<System*> (system_grob);
 517 }
 518
 519 Grob *
 520 System::get_vertical_alignment ()
 521 {
 522   extract_grob_set (this, "elements", elts);
 523   Grob *ret = 0;
 524   for (vsize i = 0; i < elts.size (); i++)
 525     if (Align_interface::has_interface (elts[i]))
 526       {
 527         if (ret)
 528           programming_error ("found multiple vertical alignments in this system");
 529         ret = elts[i];
 530       }
 531
 532   if (!ret)
 533     programming_error ("didn't find a vertical alignment in this system");
 534   return ret;
 535 }
 536
 537 // Finds the furthest staff in the given direction whose x-extent
 538 // overlaps with the given interval.
 539 Grob *
 540 System::get_extremal_staff (Direction dir, Interval const &iv)
 541 {
 542   Grob *align = get_vertical_alignment ();
 543   if (!align)
 544     return 0;
 545
 546   extract_grob_set (align, "elements", elts);
 547   vsize start = (dir == UP) ? 0 : elts.size () - 1;
 548   vsize end = (dir == UP) ? elts.size () : VPOS;
 549   for (vsize i = start; i != end; i += dir)
 550     {
 551       if (Hara_kiri_group_spanner::has_interface (elts[i]))
 552         Hara_kiri_group_spanner::consider_suicide (elts[i]);
 553
 554       Interval intersection = elts[i]->extent (this, X_AXIS);
 555       intersection.intersect (iv);
 556       if (elts[i]->is_live () && !intersection.is_empty ())
 557         return elts[i];
 558     }
 559   return 0;
 560 }
 561
 562 ADD_INTERFACE (System,
 563                "This is the top-level object: Each object in a score"
 564                " ultimately has a @code{System} object as its X and"
 565                " Y@tie{}parent.",
 566
 567                /* properties */
 568                "all-elements "
 569                "columns "
 570                "labels "
 571                "pure-Y-extent "
 572                "spaceable-staves "
 573                "skyline-distance "
 574                "skyline-horizontal-padding "
 575                )