2 system.cc -- implement System
4 source file of the GNU LilyPond music typesetter
6 (c) 1996--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "align-interface.hh"
12 #include "axis-group-interface.hh"
16 #include "paper-column.hh"
17 #include "output-def.hh"
18 #include "paper-outputter.hh"
19 #include "paper-score.hh"
23 #include "all-font-metrics.hh"
24 #include "spacing-interface.hh"
25 #include "staff-symbol-referencer.hh"
26 #include "paper-book.hh"
27 #include "paper-system.hh"
30 System::System (System const &src, int count)
31 : Spanner (src, count)
36 System::System (SCM s, Object_key const*key)
44 System::clone (int count) const
46 return new System (*this, count);
51 System::element_count () const
53 return scm_ilength (get_property ("all-elements"));
57 System::spanner_count () const
60 for (SCM s = get_property ("all-elements"); scm_is_pair (s); s = scm_cdr (s))
61 if (dynamic_cast<Spanner*> (unsmob_grob (scm_car (s))))
67 System::typeset_grob (Grob * elem)
70 programming_error ("Adding element twice.");
73 elem->pscore_ = pscore_;
74 Pointer_group_interface::add_grob (this, ly_symbol2scm ("all-elements"), elem);
75 scm_gc_unprotect_object (elem->self_scm ());
81 fixup_refpoints (SCM s)
83 for (; scm_is_pair (s); s = scm_cdr (s))
85 Grob::fixup_refpoint (scm_car (s));
92 for (SCM s = get_property ("all-elements"); scm_is_pair (s); s = scm_cdr (s))
94 Grob *g = unsmob_grob (scm_car (s));
95 if (g->internal_has_interface (ly_symbol2scm ("only-prebreak-interface")))
98 Kill no longer needed grobs.
100 Item * it = dynamic_cast<Item*> (g);
101 if (it && Item::is_breakable (it))
103 it->find_prebroken_piece (LEFT)->suicide ();
104 it->find_prebroken_piece (RIGHT)->suicide ();
108 else if (g->is_live ())
109 g->do_break_processing ();
113 fixups must be done in broken line_of_scores, because new elements
114 are put over there. */
116 for (int i=0; i < broken_intos_.size (); i++)
118 Grob *se = broken_intos_[i];
119 SCM all = se->get_property ("all-elements");
120 for (SCM s = all; scm_is_pair (s); s = scm_cdr (s))
121 fixup_refpoint (scm_car (s));
122 count += scm_ilength (all);
126 needed for doing items.
128 fixup_refpoints (get_property ("all-elements"));
130 for (SCM s = get_property ("all-elements"); scm_is_pair (s); s = scm_cdr (s))
131 unsmob_grob (scm_car (s))->handle_broken_dependencies ();
132 handle_broken_dependencies ();
134 #if 0 /* don't do this: strange side effects. */
136 /* Because the this->get_property (all-elements) contains items in 3
137 versions, handle_broken_dependencies () will leave duplicated
138 items in all-elements. Strictly speaking this is harmless, but
139 it leads to duplicated symbols in the output. ly_list_qsort_uniq_x ()
140 makes sure that no duplicates are in the list. */
141 for (int i = 0; i < line_count; i++)
143 SCM all = broken_intos_[i]->get_property ("all-elements");
144 all = ly_list_qsort_uniq_x(all);
148 if (verbose_global_b)
149 progress_indication (_f ("Element count %d.", count + element_count ()));
151 int line_count = broken_intos_.size ();
152 SCM lines = scm_c_make_vector (line_count, SCM_EOL);
154 for (int i = 0; i < line_count; i++)
156 if (verbose_global_b)
157 progress_indication ("[");
159 System *system = dynamic_cast<System*> (broken_intos_[i]);
160 system->post_processing ();
161 scm_vector_set_x (lines, scm_int2num (i), system->get_line ());
163 if (verbose_global_b)
164 progress_indication (to_string (i) + "]");
169 /* Find the loose columns in POSNS, and drape them around the columns
170 specified in BETWEEN-COLS. */
172 set_loose_columns (System* which, Column_x_positions const *posns)
174 int loose_col_count = posns->loose_cols_.size ();
175 for (int i = 0; i < loose_col_count; i++)
178 Item *loose = dynamic_cast<Item*> (posns->loose_cols_[i]);
179 Paper_column* col = dynamic_cast<Paper_column*> (loose);
188 SCM between = loose->get_property ("between-cols");
189 if (!scm_is_pair (between))
192 Item *le = dynamic_cast<Item*> (unsmob_grob (scm_car (between)));
193 Item *re = dynamic_cast<Item*> (unsmob_grob (scm_cdr (between)));
200 left = le->get_column ();
201 if (!left->get_system ())
202 left = left->find_prebroken_piece (RIGHT);
206 loose = right = re->get_column ();
209 if (!right->get_system ())
210 right = right->find_prebroken_piece (LEFT);
212 /* Divide the remaining space of the column over the left and
213 right side. At the moment, FIXME */
214 Grob *common = right->common_refpoint (left, X_AXIS);
216 Real rx = right->extent (common, X_AXIS)[LEFT];
217 Real lx = left->extent (common, X_AXIS)[RIGHT];
218 Real total_dx = rx - lx;
219 Interval cval =col->extent (col, X_AXIS);
221 /* Put it in the middle. This is not an ideal solution -- the
222 break alignment code inserts a fixed space before the clef
223 (about 1 SS), while the space following the clef is flexible.
224 In tight situations, the clef will almost be on top of the
226 Real dx = rx - lx - cval.length ();
227 if (total_dx < 2* cval.length ())
229 /* TODO: this is discontinuous. I'm too tired to
230 invent a sliding mechanism. Duh. */
236 col->system_ = which;
237 col->translate_axis (-col->relative_coordinate (common, X_AXIS), X_AXIS);
238 col->translate_axis (lx + dx - cval[LEFT], X_AXIS);
244 System::break_into_pieces (Array<Column_x_positions> const &breaking)
246 for (int i = 0; i < breaking.size (); i++)
248 System *system = dynamic_cast <System*> (clone (i));
251 Link_array<Grob> c (breaking[i].cols_);
252 pscore_->typeset_line (system);
254 system->set_bound (LEFT,c[0]);
255 system->set_bound (RIGHT,c.top ());
256 for (int j = 0; j < c.size (); j++)
258 c[j]->translate_axis (breaking[i].config_[j], X_AXIS);
259 dynamic_cast<Paper_column*> (c[j])->system_ = system;
261 set_loose_columns (system, &breaking[i]);
262 broken_intos_.push (system);
267 System::add_column (Paper_column*p)
270 SCM cs = me->get_property ("columns");
271 Grob *prev = scm_is_pair (cs) ? unsmob_grob (scm_car (cs)) : 0;
273 p->rank_ = prev ? Paper_column::get_rank (prev) + 1 : 0;
275 me->set_property ("columns", scm_cons (p->self_scm (), cs));
277 Axis_group_interface::add_element (me, p);
281 System::pre_processing ()
283 for (SCM s = get_property ("all-elements"); scm_is_pair (s); s = scm_cdr (s))
284 unsmob_grob (scm_car (s))->discretionary_processing ();
286 if (verbose_global_b)
287 progress_indication (_f ("Grob count %d", element_count ()));
289 for (SCM s = get_property ("all-elements"); scm_is_pair (s); s = scm_cdr (s))
290 unsmob_grob (scm_car (s))->handle_prebroken_dependencies ();
292 fixup_refpoints (get_property ("all-elements"));
294 for (SCM s = get_property ("all-elements"); scm_is_pair (s); s = scm_cdr (s))
296 Grob *sc = unsmob_grob (scm_car (s));
297 sc->calculate_dependencies (PRECALCED, PRECALCING, ly_symbol2scm ("before-line-breaking-callback"));
300 progress_indication ("\n");
301 progress_indication (_ ("Calculating line breaks..."));
302 progress_indication (" ");
303 for (SCM s = get_property ("all-elements"); scm_is_pair (s); s = scm_cdr (s))
305 Grob *e = unsmob_grob (scm_car (s));
306 SCM proc = e->get_property ("spacing-procedure");
307 if (ly_c_procedure_p (proc))
308 scm_call_1 (proc, e->self_scm ());
313 System::post_processing ()
315 for (SCM s = get_property ("all-elements"); scm_is_pair (s); s = scm_cdr (s))
317 Grob *g = unsmob_grob (scm_car (s));
318 g->calculate_dependencies (POSTCALCED, POSTCALCING,
319 ly_symbol2scm ("after-line-breaking-callback"));
322 Interval iv (extent (this, Y_AXIS));
324 programming_error ("System with zero extent.");
326 translate_axis (-iv[MAX], Y_AXIS);
328 /* Generate all stencils to trigger font loads.
329 This might seem inefficient, but Stencils are cached per grob
331 SCM all = get_property ("all-elements");
332 all = ly_list_qsort_uniq_x (all);
334 this->get_stencil ();
335 for (SCM s = all; scm_is_pair (s); s = scm_cdr (s))
337 Grob *g = unsmob_grob (scm_car (s));
345 static int const LAYER_COUNT = 3;
350 /* Output stencils in three layers: 0, 1, 2. Default layer: 1.
352 Start with layer 3, since scm_cons prepends to list. */
353 SCM all = get_property ("all-elements");
355 for (int i = LAYER_COUNT; i--;)
356 for (SCM s = all; scm_is_pair (s); s = scm_cdr (s))
358 Grob *g = unsmob_grob (scm_car (s));
359 Stencil *stil = g->get_stencil ();
361 /* Skip empty stencils and grobs that are not in this layer. */
363 || robust_scm2int (g->get_property ("layer"), 1) != i)
366 Offset o (g->relative_coordinate (this, X_AXIS),
367 g->relative_coordinate (this, Y_AXIS));
369 Offset extra = robust_scm2offset (g->get_property ("extra-offset"),
371 * Staff_symbol_referencer::staff_space (g);
373 /* Must copy the stencil, for we cannot change the stencil
377 st.translate (o + extra);
378 *tail = scm_cons (st.expr (), SCM_EOL);
379 tail = SCM_CDRLOC(*tail);
382 if (Stencil *me = get_stencil ())
383 exprs = scm_cons (me->expr (), exprs);
385 Interval x (extent (this, X_AXIS));
386 Interval y (extent (this, Y_AXIS));
387 Stencil sys_stencil (Box (x,y),
388 scm_cons (ly_symbol2scm ("combine-stencil"),
391 Interval staff_refpoints;
392 staff_refpoints.set_empty();
393 for (SCM s = get_property ("spaceable-staves");
394 scm_is_pair (s); s = scm_cdr (s))
396 Grob *g = unsmob_grob (scm_car (s));
397 staff_refpoints.add_point (g->relative_coordinate (this, Y_AXIS));
401 Paper_system *pl = new Paper_system (sys_stencil, false);
402 pl->staff_refpoints_ = staff_refpoints;
403 Item * break_point =this->get_bound(LEFT);
405 robust_scm2double (break_point->get_property ("page-penalty"), 0.0);
407 return scm_gc_unprotect_object (pl->self_scm ());
411 System::broken_col_range (Item const *left, Item const *right) const
413 Link_array<Item> ret;
415 left = left->get_column ();
416 right = right->get_column ();
417 SCM s = get_property ("columns");
419 while (scm_is_pair (s) && scm_car (s) != right->self_scm ())
425 while (scm_is_pair (s) && scm_car (s) != left->self_scm ())
427 Paper_column*c = dynamic_cast<Paper_column*> (unsmob_grob (scm_car (s)));
428 if (Item::is_breakable (c) && !c->system_)
438 /** Return all columns, but filter out any unused columns , since they might
439 disrupt the spacing problem. */
441 System::columns () const
444 = Pointer_group_interface__extract_grobs (this, (Grob*) 0, "columns");
446 for (int i = acs.size (); i--;)
448 bool brb = Item::is_breakable (acs[i]);
449 found = found || brb;
452 the last column should be breakable. Weed out any columns that
453 seem empty. We need to retain breakable columns, in case
454 someone forced a breakpoint.
456 if (!found || !Paper_column::is_used (acs[i]))
462 ADD_INTERFACE (System,"system-interface",
463 "This is the toplevel object: each object in a score "
464 "ultimately has a System object as its X and Y parent. ",
465 "all-elements spaceable-staves columns")