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 <math.h>
  10
  11 #include "axis-group-interface.hh"
  12 #include "warn.hh"
  13 #include "system.hh"
  14 #include "main.hh"
  15 #include "paper-column.hh"
  16 #include "output-def.hh"
  17 #include "paper-outputter.hh"
  18 #include "paper-score.hh"
  19 #include "string.hh"
  20 #include "warn.hh"
  21 #include "stencil.hh"
  22 #include "all-font-metrics.hh"
  23 #include "spacing-interface.hh"
  24 #include "staff-symbol-referencer.hh"
  25 #include "paper-book.hh"
  26 #include "paper-system.hh"
  27
  28 System::System (SCM s)
  29   : Spanner (s)
  30 {
  31   rank_ = 0;
  32 }
  33
  34 int
  35 System::element_count () const
  36 {
  37   return scm_ilength (get_property ("all-elements"));
  38 }
  39
  40 int
  41 System::spanner_count () const
  42 {
  43   int k = 0;
  44   for (SCM s = get_property ("all-elements"); ly_c_pair_p (s); s = ly_cdr (s))
  45     if (dynamic_cast<Spanner*> (unsmob_grob (ly_car (s))))
  46       k++;
  47   return k;
  48 }
  49
  50 void
  51 System::typeset_grob (Grob * elem)
  52 {
  53   if (elem->pscore_)
  54     programming_error ("Adding element twice.");
  55   else
  56     {
  57       elem->pscore_ = pscore_;
  58       Pointer_group_interface::add_grob (this, ly_symbol2scm ("all-elements"), elem);
  59       scm_gc_unprotect_object (elem->self_scm ());
  60     }
  61 }
  62
  63 // todo: use map.
  64 static void
  65 fixup_refpoints (SCM s)
  66 {
  67   for (; ly_c_pair_p (s); s = ly_cdr (s))
  68     {
  69       Grob::fixup_refpoint (ly_car (s));
  70     }
  71 }
  72
  73 SCM
  74 System::get_lines ()
  75 {
  76   for (SCM s = get_property ("all-elements"); ly_c_pair_p (s); s = ly_cdr (s))
  77     {
  78       Grob *g = unsmob_grob (ly_car (s));
  79       if (g->internal_has_interface (ly_symbol2scm ("only-prebreak-interface")))
  80         {
  81           /*
  82             Kill no longer needed grobs.
  83            */
  84           Item * it = dynamic_cast<Item*> (g);
  85           if (it && Item::is_breakable (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->is_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_property ("all-elements");
 104       for (SCM s = all; ly_c_pair_p (s); s = ly_cdr (s))
 105         fixup_refpoint (ly_car (s));
 106       count += scm_ilength (all);
 107     }
 108
 109   /*
 110     needed for doing items.
 111    */
 112   fixup_refpoints (get_property ("all-elements"));
 113
 114   for (SCM s = get_property ("all-elements"); ly_c_pair_p (s); s = ly_cdr (s))
 115     unsmob_grob (ly_car (s))->handle_broken_dependencies ();
 116   handle_broken_dependencies ();
 117
 118 #if 0  /* don't do this: strange side effects.  */
 119
 120   /* Because the this->get_property (all-elements) contains items in 3
 121      versions, handle_broken_dependencies () will leave duplicated
 122      items in all-elements.  Strictly speaking this is harmless, but
 123      it leads to duplicated symbols in the output.  ly_list_qsort_uniq_x ()
 124      makes sure that no duplicates are in the list.  */
 125   for (int i = 0; i < line_count; i++)
 126     {
 127       SCM all = broken_intos_[i]->get_property ("all-elements");
 128       all = ly_list_qsort_uniq_x(all);
 129     }
 130 #endif
 131
 132   if (verbose_global_b)
 133     progress_indication (_f ("Element count %d.",  count + element_count ()));
 134
 135   int line_count = broken_intos_.size ();
 136   SCM lines = scm_c_make_vector (line_count, SCM_EOL);
 137
 138   for (int i = 0; i < line_count; i++)
 139     {
 140       if (verbose_global_b)
 141         progress_indication ("[");
 142
 143       System *system = dynamic_cast<System*> (broken_intos_[i]);
 144       system->post_processing ();
 145       scm_vector_set_x (lines, scm_int2num (i), system->get_line ());
 146
 147       if (verbose_global_b)
 148         progress_indication (to_string (i) + "]");
 149     }
 150   return lines;
 151 }
 152
 153 /* Find the loose columns in POSNS, and drape them around the columns
 154    specified in BETWEEN-COLS.  */
 155 static void
 156 set_loose_columns (System* which, Column_x_positions const *posns)
 157 {
 158   int loose_col_count = posns->loose_cols_.size ();
 159   for (int i = 0; i < loose_col_count; i++)
 160     {
 161       int divide_over = 1;
 162       Item *loose = dynamic_cast<Item*> (posns->loose_cols_[i]);
 163       Paper_column* col = dynamic_cast<Paper_column*> (loose);
 164
 165       if (col->system_)
 166         continue;
 167
 168       Item *left = 0;
 169       Item *right = 0;
 170       while (1)
 171         {
 172           SCM between = loose->get_property ("between-cols");
 173           if (!ly_c_pair_p (between))
 174             break;
 175
 176           Item *le = dynamic_cast<Item*> (unsmob_grob (ly_car (between)));
 177           Item *re = dynamic_cast<Item*> (unsmob_grob (ly_cdr (between)));
 178
 179           if (!(le && re))
 180             break;
 181
 182           if (!left && le)
 183             {
 184               left = le->get_column ();
 185               if (!left->get_system ())
 186                 left = left->find_prebroken_piece (RIGHT);
 187             }
 188
 189           divide_over++;
 190           loose = right = re->get_column ();
 191         }
 192
 193       if (!right->get_system ())
 194         right = right->find_prebroken_piece (LEFT);
 195
 196       /* Divide the remaining space of the column over the left and
 197         right side.  At the moment,  FIXME  */
 198       Grob *common = right->common_refpoint (left, X_AXIS);
 199
 200       Real rx = right->extent (common, X_AXIS)[LEFT];
 201       Real lx = left->extent (common, X_AXIS)[RIGHT];
 202       Real total_dx = rx - lx;
 203       Interval cval =col->extent (col, X_AXIS);
 204
 205       /* Put it in the middle.  This is not an ideal solution -- the
 206          break alignment code inserts a fixed space before the clef
 207          (about 1 SS), while the space following the clef is flexible.
 208          In tight situations, the clef will almost be on top of the
 209          following note.  */
 210       Real dx = rx - lx - cval.length ();
 211       if (total_dx < 2* cval.length ())
 212         {
 213           /* TODO: this is discontinuous. I'm too tired to
 214             invent a sliding mechanism.  Duh. */
 215           dx *= 0.25;
 216         }
 217       else
 218         dx *= 0.5;
 219
 220       col->system_ = which;
 221       col->translate_axis (-col->relative_coordinate (common, X_AXIS), X_AXIS);
 222       col->translate_axis (lx + dx - cval[LEFT], X_AXIS);
 223     }
 224 }
 225
 226 // const?
 227 void
 228 System::break_into_pieces (Array<Column_x_positions> const &breaking)
 229 {
 230   for (int i = 0; i < breaking.size (); i++)
 231     {
 232       System *system = dynamic_cast <System*> (clone ());
 233       system->rank_ = i;
 234
 235       Link_array<Grob> c (breaking[i].cols_);
 236       pscore_->typeset_line (system);
 237
 238       system->set_bound (LEFT,c[0]);
 239       system->set_bound (RIGHT,c.top ());
 240       for (int j = 0; j < c.size (); j++)
 241         {
 242           c[j]->translate_axis (breaking[i].config_[j], X_AXIS);
 243           dynamic_cast<Paper_column*> (c[j])->system_ = system;
 244         }
 245       set_loose_columns (system, &breaking[i]);
 246       broken_intos_.push (system);
 247     }
 248 }
 249
 250 void
 251 System::add_column (Paper_column*p)
 252 {
 253   Grob *me = this;
 254   SCM cs = me->get_property ("columns");
 255   Grob *prev =  ly_c_pair_p (cs) ? unsmob_grob (ly_car (cs)) : 0;
 256
 257   p->rank_ = prev ? Paper_column::get_rank (prev) + 1 : 0;
 258
 259   me->set_property ("columns", scm_cons (p->self_scm (), cs));
 260
 261   Axis_group_interface::add_element (me, p);
 262 }
 263
 264 void
 265 System::pre_processing ()
 266 {
 267   for (SCM s = get_property ("all-elements"); ly_c_pair_p (s); s = ly_cdr (s))
 268     unsmob_grob (ly_car (s))->discretionary_processing ();
 269
 270   if (verbose_global_b)
 271     progress_indication (_f ("Grob count %d", element_count ()));
 272
 273   for (SCM s = get_property ("all-elements"); ly_c_pair_p (s); s = ly_cdr (s))
 274     unsmob_grob (ly_car (s))->handle_prebroken_dependencies ();
 275
 276   fixup_refpoints (get_property ("all-elements"));
 277
 278   for (SCM s = get_property ("all-elements"); ly_c_pair_p (s); s = ly_cdr (s))
 279     {
 280       Grob *sc = unsmob_grob (ly_car (s));
 281       sc->calculate_dependencies (PRECALCED, PRECALCING, ly_symbol2scm ("before-line-breaking-callback"));
 282     }
 283
 284   progress_indication ("\n");
 285   progress_indication (_ ("Calculating line breaks..."));
 286   progress_indication (" ");
 287   for (SCM s = get_property ("all-elements"); ly_c_pair_p (s); s = ly_cdr (s))
 288     {
 289       Grob *e = unsmob_grob (ly_car (s));
 290       SCM proc = e->get_property ("spacing-procedure");
 291       if (ly_c_procedure_p (proc))
 292         scm_call_1 (proc, e->self_scm ());
 293     }
 294 }
 295
 296 void
 297 System::post_processing ()
 298 {
 299   for (SCM s = get_property ("all-elements"); ly_c_pair_p (s); s = ly_cdr (s))
 300     {
 301       Grob *g = unsmob_grob (ly_car (s));
 302       g->calculate_dependencies (POSTCALCED, POSTCALCING,
 303           ly_symbol2scm ("after-line-breaking-callback"));
 304     }
 305
 306   Interval iv (extent (this, Y_AXIS));
 307   if (iv.is_empty ())
 308     programming_error ("System with zero 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   SCM all = get_property ("all-elements");
 316   all = ly_list_qsort_uniq_x (all);
 317
 318   this->get_stencil ();
 319   for (SCM s = all; ly_c_pair_p (s); s = ly_cdr (s))
 320     {
 321       Grob *g = unsmob_grob (ly_car (s));
 322       g->get_stencil ();
 323     }
 324 }
 325
 326 SCM
 327 System::get_line ()
 328 {
 329   static int const LAYER_COUNT = 3;
 330
 331   SCM stencils = SCM_EOL;
 332   if (Stencil *me = get_stencil ())
 333     stencils = scm_cons (me->smobbed_copy (), stencils);
 334
 335   /* Output stencils in three layers: 0, 1, 2.  Default layer: 1.
 336
 337      Start with layer 3, since scm_cons prepends to list.  */
 338   SCM all = get_property ("all-elements");
 339
 340   SCM exprs = SCM_EOL;
 341   SCM *tail = &exprs;
 342
 343   for (int i = LAYER_COUNT; i--;)
 344     for (SCM s = all; ly_c_pair_p (s); s = ly_cdr (s))
 345       {
 346         Grob *g = unsmob_grob (ly_car (s));
 347         Stencil *stil = g->get_stencil ();
 348
 349         /* Skip empty stencils and grobs that are not in this layer.  */
 350         if (!stil
 351             || robust_scm2int (g->get_property ("layer"), 1) != i)
 352           continue;
 353
 354         Offset o (g->relative_coordinate (this, X_AXIS),
 355                   g->relative_coordinate (this, Y_AXIS));
 356
 357         Offset extra = robust_scm2offset (g->get_property ("extra-offset"),
 358                                           Offset (0, 0))
 359           * Staff_symbol_referencer::staff_space (g);
 360
 361         /* Must copy the stencil, for we cannot change the stencil
 362            cached in G.  */
 363
 364         Stencil st = *stil;
 365         st.translate (o + extra);
 366         *tail = scm_cons (st.expr (), SCM_EOL);
 367         tail = SCM_CDRLOC(*tail);
 368
 369       }
 370
 371
 372
 373   Interval x (extent (this, X_AXIS));
 374   Interval y (extent (this, Y_AXIS));
 375   Stencil sys_stencil (Box (x,y),
 376                        scm_cons (ly_symbol2scm ("combine-stencil"),
 377                                  exprs));
 378
 379   Paper_system *pl = new Paper_system (sys_stencil, false);
 380
 381   Item * break_point =this->get_bound(LEFT);
 382   pl->penalty_ =
 383     robust_scm2double (break_point->get_property ("page-penalty"), 0.0);
 384
 385   return scm_gc_unprotect_object (pl->self_scm ());
 386 }
 387
 388 Link_array<Item>
 389 System::broken_col_range (Item const *left, Item const *right) const
 390 {
 391   Link_array<Item> ret;
 392
 393   left = left->get_column ();
 394   right = right->get_column ();
 395   SCM s = get_property ("columns");
 396
 397   while (ly_c_pair_p (s) && ly_car (s) != right->self_scm ())
 398     s = ly_cdr (s);
 399
 400   if (ly_c_pair_p (s))
 401     s = ly_cdr (s);
 402
 403   while (ly_c_pair_p (s) && ly_car (s) != left->self_scm ())
 404     {
 405       Paper_column*c = dynamic_cast<Paper_column*> (unsmob_grob (ly_car (s)));
 406       if (Item::is_breakable (c) && !c->system_)
 407         ret.push (c);
 408
 409       s = ly_cdr (s);
 410     }
 411
 412   ret.reverse ();
 413   return ret;
 414 }
 415
 416 /** Return all columns, but filter out any unused columns , since they might
 417     disrupt the spacing problem. */
 418 Link_array<Grob>
 419 System::columns () const
 420 {
 421   Link_array<Grob> acs
 422     = Pointer_group_interface__extract_grobs (this, (Grob*) 0, "columns");
 423   bool found = false;
 424   for (int i = acs.size (); i--;)
 425     {
 426       bool brb = Item::is_breakable (acs[i]);
 427       found = found || brb;
 428
 429       /*
 430         the last column should be breakable. Weed out any columns that
 431         seem empty. We need to retain breakable columns, in case
 432         someone forced a breakpoint.
 433       */
 434       if (!found || !Paper_column::is_used (acs[i]))
 435         acs.del (i);
 436     }
 437   return acs;
 438 }
 439
 440 ADD_INTERFACE (System,"system-interface",
 441                "This is the toplevel object: each object in a score "
 442                "ultimately has a System object as its X and Y parent. ",
 443                "all-elements columns")