lily/system.cc

   1 /*
   2   system.cc -- implement System
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "axis-group-interface.hh"
  10 #include "warn.hh"
  11 #include "system.hh"
  12 #include "main.hh"
  13 #include "paper-column.hh"
  14 #include "paper-def.hh"
  15 #include "paper-outputter.hh"
  16 #include "paper-score.hh"
  17 #include "string.hh"
  18 #include "warn.hh"
  19 #include "stencil.hh"
  20 #include "all-font-metrics.hh"
  21 #include "spacing-interface.hh"
  22 #include "staff-symbol-referencer.hh"
  23 #include "paper-book.hh"
  24 #include "paper-line.hh"
  25
  26 System::System (SCM s)
  27   : Spanner (s)
  28 {
  29   rank_ = 0;
  30 }
  31
  32 int
  33 System::element_count () const
  34 {
  35   return scm_ilength (get_property ("all-elements"));
  36 }
  37
  38 int
  39 System::spanner_count () const
  40 {
  41   int k =0;
  42   for (SCM s = get_property ("all-elements");
  43        ly_pair_p (s); s = ly_cdr (s))
  44     {
  45       if (dynamic_cast<Spanner*> (unsmob_grob (ly_car (s))))
  46         k++;
  47     }
  48
  49   return k;
  50 }
  51
  52
  53 int
  54 scm_default_compare (const void * a, const void *b)
  55 {
  56   SCM pa = *(SCM *)a;
  57   SCM pb = *(SCM *)b;
  58
  59   if (pa < pb)
  60     return -1;
  61   else if (pa > pb)
  62     return 1;
  63   else
  64     return 0;
  65 }
  66
  67 /*
  68   modify L in place: sort it
  69 */
  70 SCM
  71 uniquify_list (SCM l)
  72 {
  73   int len = scm_ilength (l);
  74   SCM  * arr = new SCM[len];
  75   int k = 0;
  76   for (SCM s = l; SCM_NNULLP (s); s = SCM_CDR (s))
  77     arr[k++] = SCM_CAR (s);
  78
  79   assert (k == len);
  80   qsort (arr, len, sizeof (SCM), &scm_default_compare);
  81
  82   k = 0;
  83   SCM *tail = &l;
  84
  85   for (int i = 0; i < len ; i++)
  86     {
  87       if (i && arr[i] == arr[i-1])
  88         continue;
  89
  90       SCM_SETCAR (*tail, arr[i]);
  91       tail = SCM_CDRLOC(*tail);
  92     }
  93
  94   *tail = SCM_EOL;
  95   delete[] arr;
  96
  97   return l;
  98 }
  99
 100 void
 101 System::typeset_grob (Grob * elem)
 102 {
 103   if (elem->pscore_)
 104     programming_error ("Adding element twice.");
 105
 106   elem->pscore_ = pscore_;
 107   Pointer_group_interface::add_grob (this, ly_symbol2scm ("all-elements"), elem);
 108   scm_gc_unprotect_object (elem->self_scm ());
 109 }
 110
 111 // todo: use map.
 112 static void
 113 fixup_refpoints (SCM s)
 114 {
 115   for (; ly_pair_p (s); s = ly_cdr (s))
 116     {
 117       Grob::fixup_refpoint (ly_car (s));
 118     }
 119 }
 120
 121 SCM
 122 System::get_lines ()
 123 {
 124   for (SCM s = get_property ("all-elements"); ly_pair_p (s); s = ly_cdr (s))
 125     {
 126       Grob *g = unsmob_grob (ly_car (s));
 127       if (g->internal_has_interface (ly_symbol2scm ("only-prebreak-interface")))
 128         {
 129           /*
 130             Kill no longer needed grobs.
 131            */
 132           Item * it = dynamic_cast<Item*> (g);
 133           if (it && Item::is_breakable (it))
 134             {
 135               it->find_prebroken_piece (LEFT)->suicide ();
 136               it->find_prebroken_piece (RIGHT)->suicide ();
 137             }
 138           g->suicide ();
 139         }
 140       else if (g->live ())
 141         g->do_break_processing ();
 142     }
 143
 144   /*
 145     fixups must be done in broken line_of_scores, because new elements
 146     are put over there.  */
 147   int count = 0;
 148   for (int i=0; i < broken_intos_.size (); i++)
 149     {
 150       Grob *se = broken_intos_[i];
 151       SCM all = se->get_property ("all-elements");
 152       for (SCM s = all; ly_pair_p (s); s = ly_cdr (s))
 153         fixup_refpoint (ly_car (s));
 154       count += scm_ilength (all);
 155     }
 156
 157   /*
 158     needed for doing items.
 159    */
 160   fixup_refpoints (get_property ("all-elements"));
 161
 162   for (SCM s = get_property ("all-elements"); ly_pair_p (s); s = ly_cdr (s))
 163     unsmob_grob (ly_car (s))->handle_broken_dependencies ();
 164   handle_broken_dependencies ();
 165
 166 #if 0  /* don't do this: strange side effects.  */
 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.  uniquify_list ()
 172      makes sure that no duplicates are in the list.  */
 173   for (int i = 0; i < line_count; i++)
 174     {
 175       SCM all = broken_intos_[i]->get_property ("all-elements");
 176       all = uniquify_list (all);
 177     }
 178 #endif
 179
 180   if (verbose_global_b)
 181     progress_indication (_f ("Element count %d.",  count + element_count ()));
 182
 183   int line_count = broken_intos_.size ();
 184   SCM lines = scm_c_make_vector (line_count, SCM_UNDEFINED);
 185
 186    for (int i = 0; i < line_count; i++)
 187     {
 188       if (verbose_global_b)
 189         progress_indication ("[");
 190
 191       System *system = dynamic_cast<System*> (broken_intos_[i]);
 192       system->post_processing ();
 193       scm_vector_set_x (lines, scm_int2num (i), system->get_line ());
 194
 195       if (verbose_global_b)
 196         progress_indication (to_string (i) + "]");
 197     }
 198    return lines;
 199 }
 200
 201
 202
 203
 204 /*
 205   Find the loose columns in POSNS, and drape them around the columns
 206   specified in BETWEEN-COLS.  */
 207 void
 208 set_loose_columns (System* which, Column_x_positions const *posns)
 209 {
 210   for (int i = 0; i < posns->loose_cols_.size (); i++)
 211     {
 212       int divide_over = 1;
 213       Item *loose = dynamic_cast<Item*> (posns->loose_cols_[i]);
 214       Paper_column* col = dynamic_cast<Paper_column*> (loose);
 215
 216       if (col->system_)
 217         continue;
 218
 219       Item * left = 0;
 220       Item * right = 0;
 221       do
 222         {
 223           SCM between = loose->get_property ("between-cols");
 224           if (!ly_pair_p (between))
 225             break;
 226
 227
 228           Item * l=dynamic_cast<Item*> (unsmob_grob (ly_car (between)));
 229           Item * r=dynamic_cast<Item*> (unsmob_grob (ly_cdr (between)));
 230
 231           if (!(l && r))
 232             break ;
 233
 234           if (!left && l)
 235             {
 236               left = l->get_column ();
 237               if (!left->get_system ())
 238                 left = left->find_prebroken_piece (RIGHT);
 239             }
 240
 241           divide_over ++;
 242           loose = right = r->get_column ();
 243         }
 244       while (1);
 245
 246       if (!right->get_system ())
 247         right = right->find_prebroken_piece (LEFT);
 248
 249       /*
 250         We divide the remaining space of the column over the left and
 251         right side. At the moment, we
 252
 253       */
 254       Grob * common = right->common_refpoint (left, X_AXIS);
 255
 256       Real rx = right->extent (common, X_AXIS)[LEFT];
 257       Real lx = left->extent (common, X_AXIS)[RIGHT];
 258       Real total_dx = rx - lx;
 259       Interval cval =col->extent (col, X_AXIS);
 260
 261       /*
 262
 263         We put it in the middle. This is not an ideal solution -- the
 264         break alignment code inserts a fixed space before the clef
 265         (about 1 SS), while the space following the clef is
 266         flexible. In tight situations, the clef will almost be on top
 267         of the following note.
 268
 269       */
 270       Real dx = rx-lx - cval.length ();
 271       if (total_dx < 2* cval.length ())
 272         {
 273           /*
 274             todo: this is discontinuous. I'm too tired to
 275             invent a sliding mechanism. Duh.
 276
 277             TODO.
 278            */
 279           dx *= 0.25;
 280         }
 281       else
 282         dx *= 0.5;
 283
 284       col->system_ = which;
 285       col->translate_axis (- col->relative_coordinate (common, X_AXIS), X_AXIS);
 286       col->translate_axis (lx + dx - cval[LEFT], X_AXIS);
 287     }
 288 }
 289
 290 // const?
 291 void
 292 System::break_into_pieces (Array<Column_x_positions> const &breaking)
 293 {
 294   for (int i=0; i < breaking.size (); i++)
 295     {
 296       System *system = dynamic_cast <System*> (clone ());
 297       system->rank_ = i;
 298
 299       Link_array<Grob> c (breaking[i].cols_);
 300       pscore_->typeset_line (system);
 301
 302       system->set_bound (LEFT,c[0]);
 303       system->set_bound (RIGHT,c.top ());
 304       for (int j=0; j < c.size (); j++)
 305         {
 306           c[j]->translate_axis (breaking[i].config_[j],X_AXIS);
 307           dynamic_cast<Paper_column*> (c[j])->system_ = system;
 308         }
 309       set_loose_columns (system, &breaking[i]);
 310       broken_intos_.push (system);
 311     }
 312 }
 313
 314 void
 315 System::add_column (Paper_column*p)
 316 {
 317   Grob *me = this;
 318   SCM cs = me->get_property ("columns");
 319   Grob * prev =  ly_pair_p (cs) ? unsmob_grob (ly_car (cs)) : 0;
 320
 321   p->rank_ = prev ? Paper_column::get_rank (prev) + 1 : 0;
 322
 323   me->set_property ("columns",  scm_cons (p->self_scm (), cs));
 324
 325   Axis_group_interface::add_element (me, p);
 326 }
 327
 328 void
 329 System::pre_processing ()
 330 {
 331   for (SCM s = get_property ("all-elements"); ly_pair_p (s); s = ly_cdr (s))
 332     unsmob_grob (ly_car (s))->discretionary_processing ();
 333
 334   if (verbose_global_b)
 335     progress_indication (_f ("Grob count %d",  element_count ()));
 336
 337
 338   for (SCM s = get_property ("all-elements"); ly_pair_p (s); s = ly_cdr (s))
 339     unsmob_grob (ly_car (s))->handle_prebroken_dependencies ();
 340
 341   fixup_refpoints (get_property ("all-elements"));
 342
 343   for (SCM s = get_property ("all-elements"); ly_pair_p (s); s = ly_cdr (s))
 344     {
 345       Grob* sc = unsmob_grob (ly_car (s));
 346       sc->calculate_dependencies (PRECALCED, PRECALCING, ly_symbol2scm ("before-line-breaking-callback"));
 347     }
 348
 349   progress_indication ("\n" + _ ("Calculating line breaks...") + " ");
 350   for (SCM s = get_property ("all-elements"); ly_pair_p (s); s = ly_cdr (s))
 351     {
 352       Grob * e = unsmob_grob (ly_car (s));
 353       SCM proc = e->get_property ("spacing-procedure");
 354       if (ly_procedure_p (proc))
 355         scm_call_1 (proc, e->self_scm ());
 356     }
 357 }
 358
 359 void
 360 System::post_processing ()
 361 {
 362   for (SCM s = get_property ("all-elements"); ly_pair_p (s); s = ly_cdr (s))
 363     {
 364       Grob *g = unsmob_grob (ly_car (s));
 365       g->calculate_dependencies (POSTCALCED, POSTCALCING,
 366           ly_symbol2scm ("after-line-breaking-callback"));
 367     }
 368
 369   Interval iv (extent (this, Y_AXIS));
 370   if (iv.is_empty ())
 371     programming_error ("System with zero extent.");
 372   else
 373     translate_axis (-iv[MAX], Y_AXIS);
 374
 375   /* Generate all stencils to trigger font loads.
 376      This might seem inefficient, but Stencils are cached per grob
 377      anyway. */
 378   SCM all = get_property ("all-elements");
 379   all = uniquify_list (all);
 380
 381   this->get_stencil ();
 382   for (SCM s = all; ly_pair_p (s); s = ly_cdr (s))
 383     {
 384       Grob *g = unsmob_grob (ly_car (s));
 385       g->get_stencil ();
 386     }
 387 }
 388
 389 SCM
 390 System::get_line ()
 391 {
 392   static int const LAYER_COUNT = 3;
 393
 394   SCM stencils = SCM_EOL;
 395   if (Stencil *me = get_stencil ())
 396     stencils = scm_cons (me->smobbed_copy (), stencils);
 397
 398   /* Output stencils in three layers: 0, 1, 2.  The default layer is
 399      1.
 400
 401      Start with layer 3, since  scm_cons prepends to list.
 402
 403   */
 404   SCM all = get_property ("all-elements");
 405
 406   for (int i = LAYER_COUNT; i--;)
 407     for (SCM s = all; ly_pair_p (s); s = ly_cdr (s))
 408       {
 409         Grob *g = unsmob_grob (ly_car (s));
 410         Stencil *stil = g->get_stencil ();
 411
 412         /* Skip empty stencils and grobs that are not in this layer.  */
 413         if (!stil
 414             || robust_scm2int (g->get_property ("layer"), 1) != i)
 415           continue;
 416
 417         Offset o (g->relative_coordinate (this, X_AXIS),
 418                   g->relative_coordinate (this, Y_AXIS));
 419
 420         Offset extra = robust_scm2offset (g->get_property ("extra-offset"),
 421                                           Offset (0, 0))
 422           * Staff_symbol_referencer::staff_space (g);
 423
 424         /*
 425           must copy the stencil, for we cannot change the stencil
 426           cached in G.
 427         */
 428         SCM my_stencil = stil->smobbed_copy ();
 429         unsmob_stencil (my_stencil)->translate (o + extra);
 430         stencils = scm_cons (my_stencil, stencils);
 431       }
 432
 433   if (output_format_global != PAGE_LAYOUT)
 434     {
 435       SCM lastcol = ly_car (get_property ("columns"));
 436       Grob *g = unsmob_grob (lastcol);
 437
 438       SCM between = ly_symbol2scm ("between-system-string");
 439       SCM inter = g->internal_get_property (between);
 440       if (ly_string_p (inter))
 441         stencils = scm_cons (scm_cons (between, inter), stencils);
 442     }
 443
 444   Interval x (extent (this, X_AXIS));
 445   Interval y (extent (this, Y_AXIS));
 446   Paper_line *pl = new Paper_line (Offset (x.length (), y.length ()),
 447                                    stencils);
 448
 449   scm_gc_unprotect_object (pl->self_scm ());
 450   return pl->self_scm ();
 451 }
 452
 453 Link_array<Item>
 454 System::broken_col_range (Item const*l, Item const*r) const
 455 {
 456   Link_array<Item> ret;
 457
 458   l = l->get_column ();
 459   r = r->get_column ();
 460   SCM s = get_property ("columns");
 461
 462   while (ly_pair_p (s) && ly_car (s) != r->self_scm ())
 463     s = ly_cdr (s);
 464
 465   if (ly_pair_p (s))
 466     s = ly_cdr (s);
 467
 468   while (ly_pair_p (s) && ly_car (s) != l->self_scm ())
 469     {
 470       Paper_column*c = dynamic_cast<Paper_column*> (unsmob_grob (ly_car (s)));
 471       if (Item::is_breakable (c) && !c->system_)
 472         ret.push (c);
 473
 474       s = ly_cdr (s);
 475     }
 476
 477   ret.reverse ();
 478   return ret;
 479 }
 480
 481 /**
 482    Return all columns, but filter out any unused columns , since they might
 483    disrupt the spacing problem.
 484  */
 485 Link_array<Grob>
 486 System::columns ()const
 487 {
 488   Link_array<Grob> acs
 489     = Pointer_group_interface__extract_grobs (this, (Grob*) 0, "columns");
 490   bool bfound = false;
 491   for (int i= acs.size (); i -- ;)
 492     {
 493       bool brb = Item::is_breakable (acs[i]);
 494       bfound = bfound || brb;
 495
 496       /*
 497         the last column should be breakable. Weed out any columns that
 498         seem empty. We need to retain breakable columns, in case
 499         someone forced a breakpoint.
 500       */
 501       if (!bfound || !Paper_column::is_used (acs[i]))
 502         acs.del (i);
 503     }
 504   return acs;
 505 }
 506
 507 ADD_INTERFACE (System,"system-interface",
 508                "This is the toplevel object: each object in a score "
 509                "ultimately has a System object as its X and Y parent. ",
 510                "between-system-string all-elements columns")