(protect_smob): experiment: O(1) GC (un)protection.

[lilypond.git] / lily / timing-translator.cc

diff --git a/lily/timing-translator.cc b/lily/timing-translator.cc
index f5a57d158d175b8b5ee22b7c146cfde5aedc4d63..5bee235cd67d303f51b8cf82c51895ec6417c0b8 100644 (file)
--- a/lily/timing-translator.cc
+++ b/lily/timing-translator.cc
@@ -28,14 +28,14 @@ Timing_translator::stop_translation_timestep ()
   bool timb = to_boolean (tim);
   if (timb && allbars)
     {
-      Moment barleft = (measure_length () - measure_position ());
+      Moment barleft = (measure_length () - measure_position (context ()));
       Moment now = now_mom ();
 
       if (barleft > Moment (0)
          /*
            Hmm. We insert the bar moment every time we process a
            moment.  A waste of cpu?
-          */
+         */
          && !now.grace_part_)
        global->add_moment_to_process (now + barleft);
     }
@@ -46,20 +46,20 @@ Timing_translator::initialize ()
 {
 
   /*
-    move this to engraver-init.ly? 
-   */
+    move this to engraver-init.ly?
+  */
   context ()->add_alias (ly_symbol2scm ("Timing"));
-  context ()->set_property ("timing" , SCM_BOOL_T);  
-  context ()->set_property ("currentBarNumber" , scm_int2num (1));
+  context ()->set_property ("timing", SCM_BOOL_T);
+  context ()->set_property ("currentBarNumber", scm_int2num (1));
 
   context ()->set_property ("timeSignatureFraction",
-                               scm_cons (scm_int2num (4), scm_int2num (4)));
+                           scm_cons (scm_int2num (4), scm_int2num (4)));
   /*
     Do not init measurePosition; this should be done from global
     context.
-   */
+  */
   context ()->set_property ("measureLength", Moment (Rational (1)).smobbed_copy ());
-  context ()->set_property ("beatLength", Moment (Rational (1,4)).smobbed_copy ());
+  context ()->set_property ("beatLength", Moment (Rational (1, 4)).smobbed_copy ());
 }
 
 Rational
@@ -74,24 +74,8 @@ Timing_translator::measure_length () const
 
 Timing_translator::Timing_translator ()
 {
-
 }
 
-Moment
-Timing_translator::measure_position () const
-{
-  SCM sm = get_property ("measurePosition");
-  
-  Moment m   = 0;
-  if (unsmob_moment (sm))
-    {
-      m = *unsmob_moment (sm);
-      while (m.main_part_ < Rational (0))
-       m.main_part_ += measure_length ();
-    }
-  
-  return m;
-}
 
 void
 Timing_translator::start_translation_timestep ()
@@ -99,18 +83,18 @@ Timing_translator::start_translation_timestep ()
   Global_context *global = get_global_context ();
 
   Moment now = global->now_mom ();
-  Moment dt = now  - global->previous_moment ();
+  Moment dt = now - global->previous_moment ();
   if (dt < Moment (0))
     {
-      programming_error ("Moving backwards in time");
+      programming_error ("moving backwards in time");
       dt = 0;
     }
   else if (dt.main_part_.is_infinity ())
     {
-      programming_error ("Moving infinitely to future");
+      programming_error ("moving infinitely to future");
       dt = 0;
     }
-  
+
   if (!dt.to_bool ())
     return;
 
@@ -127,9 +111,9 @@ Timing_translator::start_translation_timestep ()
       context ()->set_property ("measurePosition",
                                measposp.smobbed_copy ());
     }
-  
+
   measposp += dt;
-  
+
   SCM barn = get_property ("currentBarNumber");
   int b = 0;
   if (scm_is_number (barn))
@@ -144,16 +128,24 @@ Timing_translator::start_translation_timestep ()
   while (c && measposp.main_part_ >= len)
     {
       measposp.main_part_ -= len;
-      b ++;
+      b++;
     }
 
   context ()->set_property ("currentBarNumber", scm_int2num (b));
   context ()->set_property ("measurePosition", measposp.smobbed_copy ());
 }
 
+#include "translator.icc"
+
 ADD_TRANSLATOR (Timing_translator,
-                  "This engraver adds the alias "
-                  "@code{Timing} to its containing context."
-                  ,
+               "This engraver adds the alias "
+               "@code{Timing} to its containing context."
+               "Responsible for synchronizing timing information from staves.  "
+               "Normally in @code{Score}.  In order to create polyrhythmic music, "
+               "this engraver should be removed from @code{Score} and placed in "
+               "@code{Staff}. "
+               "\n\nThis engraver adds the alias @code{Timing} to its containing context."
+
+               ,
 
-                  "","","","","");
+               "",  "", "", "");