lily/system.cc

   1 /*
   2   system.cc -- implement System
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2006 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 "international.hh"
  16 #include "main.hh"
  17 #include "output-def.hh"
  18 #include "paper-column.hh"
  19 #include "paper-score.hh"
  20 #include "paper-system.hh"
  21 #include "pointer-group-interface.hh"
  22 #include "spacing-interface.hh"
  23 #include "staff-symbol-referencer.hh"
  24 #include "tweak-registration.hh"
  25 #include "warn.hh"
  26
  27 System::System (System const &src, int count)
  28   : Spanner (src, count)
  29 {
  30   all_elements_ = 0;
  31   pscore_ = 0;
  32   rank_ = 0;
  33   init_elements ();
  34 }
  35
  36 System::System (SCM s, Object_key const *key)
  37   : Spanner (s, key)
  38 {
  39   all_elements_ = 0;
  40   rank_ = 0;
  41   init_elements ();
  42 }
  43
  44 void
  45 System::init_elements ()
  46 {
  47   SCM scm_arr = Grob_array::make_array ();
  48   all_elements_ = unsmob_grob_array (scm_arr);
  49   all_elements_->set_ordered (false);
  50   set_object ("all-elements", scm_arr);
  51 }
  52
  53 Grob *
  54 System::clone (int index) const
  55 {
  56   return new System (*this, index);
  57 }
  58
  59 int
  60 System::element_count () const
  61 {
  62   return all_elements_->size ();
  63 }
  64
  65 int
  66 System::spanner_count () const
  67 {
  68   int k = 0;
  69   for (vsize i = all_elements_->size (); i--;)
  70     if (dynamic_cast<Spanner *> (all_elements_->grob (i)))
  71       k++;
  72   return k;
  73 }
  74
  75 void
  76 System::typeset_grob (Grob *elem)
  77 {
  78   if (elem->layout_)
  79     programming_error ("adding element twice");
  80   else
  81     {
  82       elem->layout_ = pscore_->layout ();
  83       all_elements_->add (elem);
  84       elem->unprotect ();
  85     }
  86 }
  87
  88 void
  89 System::derived_mark () const
  90 {
  91   if (!all_elements_->empty ())
  92     {
  93       Grob **ptr = &all_elements_->array_reference ()[0];
  94       Grob **end = ptr + all_elements_->size ();
  95       while (ptr < end)
  96         {
  97           scm_gc_mark ((*ptr)->self_scm ());
  98           ptr++;
  99         }
 100     }
 101
 102   if (pscore_)
 103     scm_gc_mark (pscore_->self_scm ());
 104
 105   Spanner::derived_mark ();
 106 }
 107
 108 static void
 109 fixup_refpoints (vector<Grob*> const &grobs)
 110 {
 111   for (vsize i = grobs.size (); i--;)
 112     grobs[i]->fixup_refpoint ();
 113 }
 114
 115 SCM
 116 System::get_paper_systems ()
 117 {
 118   for (vsize i = 0; i < all_elements_->size (); i++)
 119     {
 120       Grob *g = all_elements_->grob (i);
 121       if (g->internal_has_interface (ly_symbol2scm ("only-prebreak-interface")))
 122         {
 123           /*
 124             Kill no longer needed grobs.
 125           */
 126           Item *it = dynamic_cast<Item *> (g);
 127           if (it && Item::is_non_musical (it))
 128             {
 129               it->find_prebroken_piece (LEFT)->suicide ();
 130               it->find_prebroken_piece (RIGHT)->suicide ();
 131             }
 132           g->suicide ();
 133         }
 134       else if (g->is_live ())
 135         g->do_break_processing ();
 136     }
 137
 138   /*
 139     fixups must be done in broken line_of_scores, because new elements
 140     are put over there.  */
 141   int count = 0;
 142   for (vsize i = 0; i < broken_intos_.size (); i++)
 143     {
 144       Grob *se = broken_intos_[i];
 145
 146       extract_grob_set (se, "all-elements", all_elts);
 147       for (vsize j = 0; j < all_elts.size (); j++)
 148         {
 149           Grob *g = all_elts[j];
 150           g->fixup_refpoint ();
 151         }
 152
 153       count += all_elts.size ();
 154     }
 155
 156   /*
 157     needed for doing items.
 158   */
 159   fixup_refpoints (all_elements_->array ());
 160
 161   for (vsize i = 0; i < all_elements_->size (); i++)
 162     all_elements_->grob (i)->handle_broken_dependencies ();
 163
 164   handle_broken_dependencies ();
 165
 166   /* Because the this->get_property (all-elements) contains items in 3
 167      versions, handle_broken_dependencies () will leave duplicated
 168      items in all-elements.  Strictly speaking this is harmless, but
 169      it leads to duplicated symbols in the output.  uniq makes sure
 170      that no duplicates are in the list.  */
 171   for (vsize i = 0; i < broken_intos_.size (); i++)
 172     {
 173       System *child = dynamic_cast<System*> (broken_intos_[i]);
 174       child->all_elements_->remove_duplicates ();
 175     }
 176
 177   if (be_verbose_global)
 178     message (_f ("Element count %d.", count + element_count ()));
 179
 180   SCM lines = scm_c_make_vector (broken_intos_.size (), SCM_EOL);
 181   for (vsize i = 0; i < broken_intos_.size (); i++)
 182     {
 183       if (be_verbose_global)
 184         progress_indication ("[");
 185
 186       System *system = dynamic_cast<System *> (broken_intos_[i]);
 187
 188       system->post_processing ();
 189       scm_vector_set_x (lines, scm_from_int (i),
 190                         system->get_paper_system ());
 191
 192       if (be_verbose_global)
 193         progress_indication (to_string (i) + "]");
 194     }
 195   return lines;
 196 }
 197
 198 void
 199 System::break_into_pieces (vector<Column_x_positions> const &breaking)
 200 {
 201   for (vsize i = 0; i < breaking.size (); i++)
 202     {
 203       System *system = dynamic_cast<System *> (clone (broken_intos_.size ()));
 204       system->rank_ = broken_intos_.size ();
 205
 206       vector<Grob*> c (breaking[i].cols_);
 207       pscore_->typeset_system (system);
 208
 209       int st = Paper_column::get_rank (c[0]);
 210       int end = Paper_column::get_rank (c.back ());
 211       Interval iv (pure_height (this, st, end));
 212       system->set_property ("pure-Y-extent", ly_interval2scm (iv));
 213
 214       system->set_bound (LEFT, c[0]);
 215       system->set_bound (RIGHT, c.back ());
 216       for (vsize j = 0; j < c.size (); j++)
 217         {
 218           c[j]->translate_axis (breaking[i].config_[j], X_AXIS);
 219           dynamic_cast<Paper_column *> (c[j])->system_ = system;
 220         }
 221
 222       set_loose_columns (system, &breaking[i]);
 223       broken_intos_.push_back (system);
 224     }
 225 }
 226
 227 void
 228 System::add_column (Paper_column *p)
 229 {
 230   Grob *me = this;
 231   Grob_array *ga = unsmob_grob_array (me->get_object ("columns"));
 232   if (!ga)
 233     {
 234       SCM scm_ga = Grob_array::make_array ();
 235       me->set_object ("columns", scm_ga);
 236       ga = unsmob_grob_array (scm_ga);
 237     }
 238
 239   p->rank_
 240     = ga->size ()
 241     ? Paper_column::get_rank (ga->array ().back ()) + 1
 242     : 0;
 243
 244   ga->add (p);
 245   Axis_group_interface::add_element (this, p);
 246 }
 247
 248 void
 249 apply_tweaks (Grob *g, bool broken)
 250 {
 251   if (bool (g->original ()) == broken)
 252     {
 253       SCM tweaks = global_registry_->get_tweaks (g);
 254       for (SCM s = tweaks; scm_is_pair (s); s = scm_cdr (s))
 255         {
 256           SCM proc = scm_caar (s);
 257           SCM rest = scm_cdar (s);
 258           scm_apply_1 (proc, g->self_scm (), rest);
 259         }
 260     }
 261 }
 262
 263 void
 264 System::pre_processing ()
 265 {
 266   for (vsize i = 0; i < all_elements_->size (); i++)
 267     all_elements_->grob (i)->discretionary_processing ();
 268
 269   if (be_verbose_global)
 270     message (_f ("Grob count %d", element_count ()));
 271
 272   /*
 273     order is significant: broken grobs are added to the end of the
 274     array, and should be processed before the original is potentially
 275     killed.
 276   */
 277   for (vsize i = all_elements_->size (); i--;)
 278     all_elements_->grob (i)->handle_prebroken_dependencies ();
 279
 280   fixup_refpoints (all_elements_->array ());
 281
 282   for (vsize i = 0; i < all_elements_->size (); i++)
 283     apply_tweaks (all_elements_->grob (i), false);
 284
 285   for (vsize i = 0; i < all_elements_->size (); i++)
 286     {
 287       Grob *g = all_elements_->grob (i);
 288       (void) g->get_property ("before-line-breaking");
 289     }
 290
 291   for (vsize i = 0; i < all_elements_->size (); i++)
 292     {
 293       Grob *e = all_elements_->grob (i);
 294       (void) e->get_property ("springs-and-rods");
 295     }
 296 }
 297
 298 void
 299 System::post_processing ()
 300 {
 301   for (vsize i = 0; i < all_elements_->size (); i++)
 302     {
 303       Grob *g = all_elements_->grob (i);
 304
 305       apply_tweaks (g, true);
 306       (void) g->get_property ("after-line-breaking");
 307     }
 308
 309   Interval iv (extent (this, Y_AXIS));
 310   if (iv.is_empty ())
 311     programming_error ("system with empty extent");
 312   else
 313     translate_axis (-iv[MAX], Y_AXIS);
 314
 315   /* Generate all stencils to trigger font loads.
 316      This might seem inefficient, but Stencils are cached per grob
 317      anyway. */
 318
 319   vector<Grob*> all_elts_sorted (all_elements_->array ());
 320   vector_sort (all_elts_sorted, std::less<Grob*> ());
 321   uniq (all_elts_sorted);
 322   this->get_stencil ();
 323   for (vsize i = all_elts_sorted.size (); i--;)
 324     {
 325       Grob *g = all_elts_sorted[i];
 326       g->get_stencil ();
 327     }
 328 }
 329
 330 struct Layer_entry
 331 {
 332   Grob *grob_;
 333   int layer_;
 334 };
 335
 336 bool
 337 operator< (Layer_entry  const &a,
 338            Layer_entry  const &b)
 339 {
 340   return a.layer_ < b.layer_;
 341 }
 342
 343
 344 SCM
 345 System::get_paper_system ()
 346 {
 347   SCM exprs = SCM_EOL;
 348   SCM *tail = &exprs;
 349
 350   vector<Layer_entry> entries;
 351   for (vsize j = 0; j < all_elements_->size (); j++)
 352     {
 353       Layer_entry e;
 354       e.grob_ = all_elements_->grob (j);
 355       e.layer_ = robust_scm2int (e.grob_->get_property ("layer"), 1);
 356
 357       entries.push_back (e);
 358     }
 359
 360   vector_sort (entries, std::less<Layer_entry> ());
 361   for (vsize j = 0; j < entries.size (); j++)
 362     {
 363       Grob *g = entries[j].grob_;
 364       Stencil st = g->get_print_stencil ();
 365
 366       if (st.expr() == SCM_EOL)
 367         continue;
 368
 369       Offset o;
 370       for (int a = X_AXIS; a < NO_AXES; a++)
 371         o[Axis (a)] = g->relative_coordinate (this, Axis (a));
 372
 373       Offset extra = robust_scm2offset (g->get_property ("extra-offset"),
 374                                         Offset (0, 0))
 375         * Staff_symbol_referencer::staff_space (g);
 376
 377       /* Must copy the stencil, for we cannot change the stencil
 378          cached in G.  */
 379
 380       st.translate (o + extra);
 381
 382       *tail = scm_cons (st.expr (), SCM_EOL);
 383       tail = SCM_CDRLOC (*tail);
 384     }
 385
 386   if (Stencil *me = get_stencil ())
 387     exprs = scm_cons (me->expr (), exprs);
 388
 389   Interval x (extent (this, X_AXIS));
 390   Interval y (extent (this, Y_AXIS));
 391   Stencil sys_stencil (Box (x, y),
 392                        scm_cons (ly_symbol2scm ("combine-stencil"),
 393                                  exprs));
 394
 395   Grob *left_bound = this->get_bound (LEFT);
 396   SCM prop_init = left_bound->get_property ("line-break-system-details");
 397   Prob *pl = make_paper_system (prop_init);
 398   paper_system_set_stencil (pl, sys_stencil);
 399
 400   /* information that the page breaker might need */
 401   Grob *right_bound = this->get_bound (RIGHT);
 402   pl->set_property ("page-break-permission", right_bound->get_property ("page-break-permission"));
 403   pl->set_property ("page-turn-permission", right_bound->get_property ("page-turn-permission"));
 404   pl->set_property ("page-break-penalty", right_bound->get_property ("page-break-penalty"));
 405   pl->set_property ("page-turn-penalty", right_bound->get_property ("page-turn-penalty"));
 406
 407   if (!scm_is_pair (pl->get_property ("refpoint-Y-extent")))
 408     {
 409       Interval staff_refpoints;
 410       staff_refpoints.set_empty ();
 411       extract_grob_set (this, "spaceable-staves", staves);
 412       for (vsize i = 0; i < staves.size (); i++)
 413         {
 414           Grob *g = staves[i];
 415           staff_refpoints.add_point (g->relative_coordinate (this, Y_AXIS));
 416         }
 417       pl->set_property ("refpoint-Y-extent", ly_interval2scm (staff_refpoints));
 418     }
 419
 420   pl->set_property ("system-grob", this->self_scm ());
 421
 422   return pl->unprotect ();
 423 }
 424
 425 vector<Item*>
 426 System::broken_col_range (Item const *left, Item const *right) const
 427 {
 428   vector<Item*> ret;
 429
 430   left = left->get_column ();
 431   right = right->get_column ();
 432
 433   extract_grob_set (this, "columns", cols);
 434   vsize i = 0;
 435   while (i < cols.size ()
 436          && cols[i] != left)
 437     i++;
 438
 439   if (i < cols.size ())
 440     i++;
 441
 442   while (i < cols.size ()
 443          && cols[i] != right)
 444     {
 445       Paper_column *c = dynamic_cast<Paper_column *> (cols[i]);
 446       if (Paper_column::is_breakable (c) && !c->system_)
 447         ret.push_back (c);
 448       i++;
 449     }
 450
 451   return ret;
 452 }
 453
 454 /** Return all columns, but filter out any unused columns , since they might
 455     disrupt the spacing problem. */
 456 vector<Grob*>
 457 System::columns () const
 458 {
 459   extract_grob_set (this, "columns", ro_columns);
 460
 461   int last_breakable = ro_columns.size ();
 462
 463   while (last_breakable--)
 464     {
 465       if (Paper_column::is_breakable (ro_columns [last_breakable]))
 466         break;
 467     }
 468
 469   vector<Grob*> columns;
 470   for (int i = 0; i <= last_breakable; i++)
 471     {
 472       if (Paper_column::is_used (ro_columns[i]))
 473         columns.push_back (ro_columns[i]);
 474     }
 475
 476   return columns;
 477 }
 478
 479 Paper_score*
 480 System::paper_score () const
 481 {
 482   return pscore_;
 483 }
 484
 485 int
 486 System::get_rank () const
 487 {
 488   return rank_;
 489 }
 490
 491 System *
 492 get_root_system (Grob *me)
 493 {
 494   Grob *system_grob = me;
 495
 496   while (system_grob->get_parent (Y_AXIS))
 497     system_grob = system_grob->get_parent (Y_AXIS);
 498
 499   return dynamic_cast<System*> (system_grob);
 500 }
 501
 502
 503
 504 ADD_INTERFACE (System, "system-interface",
 505                "This is the toplevel object: each object in a score "
 506                "ultimately has a System object as its X and Y parent. ",
 507
 508                /* properties */
 509                "all-elements "
 510                "columns "
 511                "pure-Y-extent "
 512                "spaceable-staves "
 513                )