2 grob.cc -- implement Grob
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
15 #include "input-smob.hh"
17 #include "pointer-group-interface.hh"
19 #include "paper-score.hh"
28 #include "paper-score.hh"
29 #include "ly-smobs.icc"
30 #include "output-def.hh"
33 Grob::clone (int count) const
35 return new Grob (*this, count);
40 - remove dynamic_cast<Spanner, Item> and put this code into respective
44 #define INFINITY_MSG "Infinity or NaN encountered"
46 Grob::Grob (SCM basicprops,
47 Object_key const *key)
50 /* FIXME: default should be no callback. */
55 interfaces_ = SCM_EOL;
56 immutable_property_alist_ = basicprops;
57 mutable_property_alist_ = SCM_EOL;
58 object_alist_ = SCM_EOL;
61 /* We do smobify_self () as the first step. Since the object lives
62 on the heap, none of its SCM variables are protected from
63 GC. After smobify_self (), they are. */
67 We always get a new key object for a new grob.
70 scm_gc_unprotect_object (key_->self_scm ());
71 SCM meta = get_property ("meta");
72 if (scm_is_pair (meta))
74 interfaces_ = scm_cdr (scm_assoc (ly_symbol2scm ("interfaces"), meta));
79 - destill this into a function, so we can re-init the immutable
80 properties with a new BASICPROPS value after
81 creation. Convenient eg. when using \override with
84 char const *onames[] = {"X-offset-callbacks", "Y-offset-callbacks"};
85 char const *xnames[] = {"X-extent", "Y-extent"};
86 char const *enames[] = {"X-extent-callback", "Y-extent-callback"};
88 for (int a = X_AXIS; a <= Y_AXIS; a++)
90 SCM l = get_property (onames[a]);
92 if (scm_ilength (l) >= 0)
94 dim_cache_[a].offset_callbacks_ = l;
95 dim_cache_[a].offsets_left_ = scm_ilength (l);
98 programming_error ("[XY]-offset-callbacks must be a list");
100 SCM cb = get_property (enames[a]);
101 if (cb == SCM_BOOL_F)
103 dim_cache_[a].dimension_ = SCM_BOOL_F;
106 SCM xt = get_property (xnames[a]);
107 if (is_number_pair (xt))
109 dim_cache_[a].dimension_ = xt;
111 else if (ly_is_procedure (cb))
113 dim_cache_[a].dimension_callback_ = cb;
115 else if (cb == SCM_EOL
116 && ly_is_procedure (get_property ("print-function")))
117 dim_cache_[a].dimension_callback_ = stencil_extent_proc;
121 Grob::Grob (Grob const &s, int copy_index)
122 : dim_cache_ (s.dim_cache_)
124 key_ = (use_object_keys) ? new Copied_key (s.key_, copy_index) : 0;
125 original_ = (Grob *) & s;
128 immutable_property_alist_ = s.immutable_property_alist_;
129 mutable_property_alist_ = ly_deep_copy (s.mutable_property_alist_);
130 interfaces_ = s.interfaces_;
131 object_alist_ = SCM_EOL;
133 /* No properties are copied. That is the job of
134 handle_broken_dependencies. */
140 scm_gc_unprotect_object (key_->self_scm ());
147 MAKE_SCHEME_CALLBACK (Grob, stencil_extent, 2);
149 Grob::stencil_extent (SCM element_smob, SCM scm_axis)
151 Grob *s = unsmob_grob (element_smob);
152 Axis a = (Axis) scm_to_int (scm_axis);
154 Stencil *m = s->get_stencil ();
158 return ly_interval2scm (e);
162 robust_relative_extent (Grob *me, Grob *refp, Axis a)
164 Interval ext = me->extent (refp, a);
167 ext.add_point (me->relative_coordinate (refp, a));
174 Grob::get_layout () const
176 return pscore_ ? pscore_->layout () : 0;
179 /* Recursively track all dependencies of this Grob. The status_ field
180 is used as a mark-field. It is marked with BUSY during execution
181 of this function, and marked with FINAL when finished.
183 FUNCPTR is the function to call to update this element. */
185 Grob::calculate_dependencies (int final, int busy, SCM funcname)
187 if (status_ >= final)
192 programming_error ("element is busy, come back later");
198 extract_grob_set (this, "dependencies", deps);
199 for (int i = 0; i < deps.size (); i++)
200 deps[i]->calculate_dependencies (final, busy, funcname);
202 SCM proc = internal_get_property (funcname);
203 if (ly_is_procedure (proc))
204 scm_call_1 (proc, this->self_scm ());
210 Grob::get_stencil () const
215 SCM stil = get_property ("stencil");
216 if (unsmob_stencil (stil))
217 return unsmob_stencil (stil);
219 stil = get_uncached_stencil ();
222 Grob *me = (Grob *) this;
223 me->set_property ("stencil", stil);
226 return unsmob_stencil (stil);
230 Grob::get_uncached_stencil () const
232 SCM proc = get_property ("print-function");
235 if (ly_is_procedure (proc))
236 stil = scm_apply_0 (proc, scm_list_n (this->self_scm (), SCM_UNDEFINED));
238 if (Stencil *m = unsmob_stencil (stil))
240 if (to_boolean (get_property ("transparent")))
241 stil = Stencil (m->extent_box (), SCM_EOL).smobbed_copy ();
244 SCM expr = m->expr ();
245 if (point_and_click_global)
246 expr = scm_list_3 (ly_symbol2scm ("grob-cause"), self_scm (), expr);
248 stil = Stencil (m->extent_box (), expr).smobbed_copy ();
251 /* color support... see interpret_stencil_expression () for more... */
252 SCM color = get_property ("color");
253 if (color != SCM_EOL)
255 m = unsmob_stencil (stil);
256 SCM expr = scm_list_3 (ly_symbol2scm ("color"),
260 stil = Stencil (m->extent_box (), expr).smobbed_copy ();
271 Grob::do_break_processing ()
276 Grob::get_system () const
282 Grob::add_dependency (Grob *e)
285 Pointer_group_interface::add_grob (this, ly_symbol2scm ("dependencies"), e);
287 programming_error ("null dependency added");
291 Grob::handle_broken_dependencies ()
293 Spanner *sp = dynamic_cast<Spanner *> (this);
298 /* THIS, SP is the original spanner. We use a special function
299 because some Spanners have enormously long lists in their
300 properties, and a special function fixes FOO */
302 for (SCM s = object_alist_; scm_is_pair (s); s = scm_cdr (s))
303 sp->substitute_one_mutable_property (scm_caar (s), scm_cdar (s));
306 System *system = get_system ();
310 && common_refpoint (system, X_AXIS)
311 && common_refpoint (system, Y_AXIS))
312 substitute_object_links (system->self_scm (), object_alist_);
313 else if (dynamic_cast<System *> (this))
314 substitute_object_links (SCM_UNDEFINED, object_alist_);
316 /* THIS element is `invalid'; it has been removed from all
317 dependencies, so let's junk the element itself.
319 Do not do this for System, since that would remove references
320 to the originals of score-grobs, which get then GC'd (a bad
325 /* Note that we still want references to this element to be
326 rearranged, and not silently thrown away, so we keep pointers like
327 {broken_into_{drul, array}, original}
335 mutable_property_alist_ = SCM_EOL;
336 object_alist_ = SCM_EOL;
337 immutable_property_alist_ = SCM_EOL;
338 interfaces_ = SCM_EOL;
340 set_extent (SCM_EOL, Y_AXIS);
341 set_extent (SCM_EOL, X_AXIS);
343 set_extent_callback (SCM_EOL, Y_AXIS);
344 set_extent_callback (SCM_EOL, X_AXIS);
346 for (int a = X_AXIS; a <= Y_AXIS; a++)
348 dim_cache_[a].offset_callbacks_ = SCM_EOL;
349 dim_cache_[a].offsets_left_ = 0;
354 Grob::handle_prebroken_dependencies ()
356 /* Don't do this in the derived method, since we want to keep access to
357 object_alist_ centralized. */
360 Item *it = dynamic_cast<Item *> (this);
361 substitute_object_links (scm_int2num (it->break_status_dir ()),
362 original_->object_alist_);
367 Grob::find_broken_piece (System *) const
372 /* Translate in one direction. */
374 Grob::translate_axis (Real y, Axis a)
376 if (isinf (y) || isnan (y))
377 programming_error (_ (INFINITY_MSG));
379 dim_cache_[a].offset_ += y;
382 /* Find the offset relative to D. If D equals THIS, then it is 0.
383 Otherwise, it recursively defd as
385 OFFSET_ + PARENT_L_->relative_coordinate (D) */
387 Grob::relative_coordinate (Grob const *refp, Axis a) const
392 /* We catch PARENT_L_ == nil case with this, but we crash if we did
393 not ask for the absolute coordinate (ie. REFP == nil.) */
394 if (refp == dim_cache_[a].parent_)
395 return get_offset (a);
397 return get_offset (a) + dim_cache_[a].parent_->relative_coordinate (refp, a);
400 /* Invoke callbacks to get offset relative to parent. */
402 Grob::get_offset (Axis a) const
404 Grob *me = (Grob *) this;
405 while (dim_cache_[a].offsets_left_)
407 int l = --me->dim_cache_[a].offsets_left_;
408 SCM cb = scm_list_ref (dim_cache_[a].offset_callbacks_, scm_int2num (l));
409 SCM retval = scm_call_2 (cb, self_scm (), scm_int2num (a));
411 Real r = scm_to_double (retval);
412 if (isinf (r) || isnan (r))
414 programming_error (INFINITY_MSG);
417 me->dim_cache_[a].offset_ += r;
419 return dim_cache_[a].offset_;
423 Grob::is_empty (Axis a) const
425 return !(scm_is_pair (dim_cache_[a].dimension_)
426 || ly_is_procedure (dim_cache_[a].dimension_callback_));
430 Grob::flush_extent_cache (Axis axis)
432 Dimension_cache *d = &dim_cache_[axis];
433 if (ly_is_procedure (d->dimension_callback_)
434 && scm_is_pair (d->dimension_))
436 d->dimension_ = SCM_EOL;
438 if (get_parent (axis))
439 get_parent (axis)->flush_extent_cache (axis);
444 Grob::extent (Grob *refp, Axis a) const
446 Real x = relative_coordinate (refp, a);
448 Dimension_cache *d = (Dimension_cache *) & dim_cache_[a];
451 SCM dimpair = d->dimension_;
452 if (scm_is_pair (dimpair))
454 else if (ly_is_procedure (d->dimension_callback_)
455 && d->dimension_ == SCM_EOL)
456 d->dimension_ = scm_call_2 (d->dimension_callback_, self_scm (), scm_int2num (a));
460 if (!scm_is_pair (d->dimension_))
463 ext = ly_scm2interval (d->dimension_);
465 SCM extra = get_property (a == X_AXIS
470 if (scm_is_pair (extra))
472 ext[BIGGER] += scm_to_double (scm_cdr (extra));
473 ext[SMALLER] += scm_to_double (scm_car (extra));
476 extra = get_property (a == X_AXIS
478 : "minimum-Y-extent");
479 if (scm_is_pair (extra))
480 ext.unite (Interval (scm_to_double (scm_car (extra)),
481 scm_to_double (scm_cdr (extra))));
488 /* Find the group-element which has both #this# and #s# */
490 Grob::common_refpoint (Grob const *s, Axis a) const
492 /* I don't like the quadratic aspect of this code, but I see no
493 other way. The largest chain of parents might be 10 high or so,
494 so it shouldn't be a real issue. */
495 for (Grob const *c = this; c; c = c->dim_cache_[a].parent_)
496 for (Grob const *d = s; d; d = d->dim_cache_[a].parent_)
504 common_refpoint_of_list (SCM elist, Grob *common, Axis a)
506 for (; scm_is_pair (elist); elist = scm_cdr (elist))
507 if (Grob *s = unsmob_grob (scm_car (elist)))
510 common = common->common_refpoint (s, a);
519 common_refpoint_of_array (Link_array<Grob> const &arr, Grob *common, Axis a)
521 for (int i = arr.size (); i--;)
522 if (Grob *s = arr[i])
525 common = common->common_refpoint (s, a);
536 SCM meta = get_property ("meta");
537 SCM nm = scm_assoc (ly_symbol2scm ("name"), meta);
538 nm = (scm_is_pair (nm)) ? scm_cdr (nm) : SCM_EOL;
539 return scm_is_symbol (nm) ? ly_symbol2string (nm) : classname (this);
543 Grob::add_offset_callback (SCM cb, Axis a)
545 if (!has_offset_callback (cb, a))
547 dim_cache_[a].offset_callbacks_
548 = scm_cons (cb, dim_cache_[a].offset_callbacks_);
549 dim_cache_[a].offsets_left_++;
554 Grob::has_extent_callback (SCM cb, Axis a) const
556 return scm_equal_p (cb, dim_cache_[a].dimension_callback_) == SCM_BOOL_T;
560 Grob::has_offset_callback (SCM cb, Axis a) const
562 return scm_c_memq (cb, dim_cache_[a].offset_callbacks_) != SCM_BOOL_F;
566 Grob::set_extent (SCM dc, Axis a)
568 dim_cache_[a].dimension_ = dc;
572 Grob::set_extent_callback (SCM dc, Axis a)
574 dim_cache_[a].dimension_callback_ = dc;
578 Grob::set_parent (Grob *g, Axis a)
580 dim_cache_[a].parent_ = g;
584 Grob::fixup_refpoint ()
586 for (int a = X_AXIS; a < NO_AXES; a++)
589 Grob *parent = get_parent (ax);
594 if (parent->get_system () != get_system () && get_system ())
596 Grob *newparent = parent->find_broken_piece (get_system ());
597 set_parent (newparent, ax);
600 if (Item *i = dynamic_cast<Item *> (this))
602 Item *parenti = dynamic_cast<Item *> (parent);
606 Direction my_dir = i->break_status_dir ();
607 if (my_dir != parenti->break_status_dir ())
609 Item *newparent = parenti->find_prebroken_piece (my_dir);
610 set_parent (newparent, ax);
618 Grob::warning (String s) const
620 SCM cause = self_scm ();
621 while (Grob *g = unsmob_grob (cause))
622 cause = g->get_property ("cause");
624 if (Music *m = unsmob_music (cause))
625 m->origin ()->warning (s);
631 Grob::programming_error (String s) const
633 s = _f ("programming error: %s", s);
637 Grob::discretionary_processing ()
643 Grob::internal_has_interface (SCM k)
645 return scm_c_memq (k, interfaces_) != SCM_BOOL_F;
649 Grob::get_parent (Axis a) const
651 return dim_cache_[a].parent_;
654 /** Return Array of Grobs in SCM list LST */
656 ly_scm2grobs (SCM lst)
658 Link_array<Grob> arr;
660 for (SCM s = lst; scm_is_pair (s); s = scm_cdr (s))
663 arr.push (unsmob_grob (e));
671 Grob::get_key () const
676 /** Return SCM list of Grob array A */
678 ly_grobs2scm (Link_array<Grob> a)
681 for (int i = a.size (); i; i--)
682 s = scm_cons (a[i - 1]->self_scm (), s);
687 ADD_INTERFACE (Grob, "grob-interface",
688 "A grob represents a piece of music notation\n"
690 "All grobs have an X and Y-position on the page. These X and Y positions\n"
691 "are stored in a relative format, so they can easily be combined by\n"
692 "stacking them, hanging one grob to the side of another, and coupling\n"
693 "them into a grouping objects.\n"
695 "Each grob has a reference point (a.k.a. parent): the position of a grob\n"
696 "is stored relative to that reference point. For example the X-reference\n"
697 "point of a staccato dot usually is the note head that it applies\n"
698 "to. When the note head is moved, the staccato dot moves along\n"
701 "A grob is often associated with a symbol, but some grobs do not print\n"
702 "any symbols. They take care of grouping objects. For example, there is a\n"
703 "separate grob that stacks staves vertically. The @ref{NoteCollision}\n"
704 "is also an abstract grob: it only moves around chords, but doesn't print\n"
707 "Grobs have a properties: Scheme variables, that can be read and set. "
708 "They have two types. Immutable variables "
709 "define the default style and behavior. They are shared between many objects. "
710 "They can be changed using @code{\\override} and @code{\\revert}. "
712 "Mutable properties are variables that are specific to one grob. Typically, "
713 "lists of other objects, or results from computations are stored in"
714 "mutable properties: every call to set-grob-property (or its C++ equivalent) "
715 "sets a mutable property. ",
716 "X-offset-callbacks Y-offset-callbacks X-extent-callback stencil cause "
717 "Y-extent-callback print-function extra-offset spacing-procedure "
718 "context staff-symbol interfaces dependencies X-extent Y-extent extra-X-extent "
719 "meta layer before-line-breaking-callback "
721 "axis-group-parent-X "
722 "axis-group-parent-Y "
723 "after-line-breaking-callback extra-Y-extent minimum-X-extent "
724 "minimum-Y-extent transparent");