Be more efficient when recording.

src/canvas.C

@@ -504,6 +504,7 @@ Canvas::draw_playhead ( void )
         }
     }
 
+
     copy();
 
     for ( uint x = m.vp->w; x-- ; )
@@ -512,6 +513,13 @@ Canvas::draw_playhead ( void )
 
     flip();
 
+    /* actually if we're recording, we should draw the grid once per
+     * playhead movement also */
+    if ( pattern::recording() == m.grid )
+    {
+        draw();
+    }
+
     return 1;
 }
 

src/grid.C

@@ -52,6 +52,7 @@ Grid::Grid ( void )
     viewport.y = 0;
 
     _playing = false;
+    _suspend_update = false;
     _start = _end = _index = 0;
 }
 
@@ -124,7 +125,8 @@ Grid::unlock ( void )
 
         _rw = NULL;
 
-        signal_events_change();
+        if ( ! _suspend_update )
+            signal_events_change();
     }
 }
 

src/grid.H

@@ -111,6 +111,8 @@ protected:
 
     int      _draw_shape;
 
+    bool     _suspend_update;
+
     unsigned int     _bpb;                                  /* beats per bar */
     unsigned int     _ppqn;                                 /* pulses per quarter note (beat) */
 
@@ -142,7 +144,7 @@ protected:
 
 private:
 
-    int _locked;
+    volatile int _locked;
 
 public:
 

src/jack.C

@@ -89,19 +89,15 @@ static port_t input[2];                                                /* contro
 jack_nframes_t nframes;                                         /* for compatibility with older jack */
 
 /** get next recorded event, if any--runs in UI thread */
-midievent *
-midi_input_event ( int port )
+bool
+midi_input_event ( int port, midievent *me )
 {
     if ( jack_ringbuffer_read_space( input[ port ].ring_buf ) >= sizeof( midievent ) )
     {
-        midievent *me = new midievent;
-
-//        MESSAGE( "passing midi input to non-RT thread" );
-
         if ( jack_ringbuffer_read( input[ port ].ring_buf, (char *)me, sizeof( midievent ) ) )
-            return me;
+            return true;
     }
-    return NULL;
+    return false;
 }
 
 /**

src/jack.H

@@ -7,7 +7,7 @@ enum { CONTROL, PERFORMANCE };
 
 class midievent;
 
-midievent * midi_input_event ( int port );
+bool midi_input_event ( int port, midievent *e );
 void midi_output_event ( int port, const midievent *e );
 void midi_output_event ( int port, const midievent *e, tick_t duration );
 void midi_all_sound_off ( void );

src/main.C

@@ -96,11 +96,10 @@ init_song ( void )
 void
 handle_midi_input ( void )
 {
-    midievent *e;
-    while ( ( e = midi_input_event( PERFORMANCE ) ) )
+    midievent e;
+    while ( ( midi_input_event( PERFORMANCE, &e ) ) )
     {
-        pattern::record_event( e );
-        delete e;
+        pattern::record_event( &e );
     }
 }
 

src/pattern.C

@@ -136,6 +136,9 @@ pattern::reset ( void )
     }
 }
 
+/* records a MIDI event into a temporary buffer. It'll only be
+ * permanently added to pattern after recording stops or the pattern
+ * loops. */
 void
 pattern::record_event ( const midievent *me )
 {
@@ -232,8 +235,10 @@ pattern::record_event ( const midievent *me )
                 el->unlink( e );
                 p->_rw->events.insert( e );
             }
-
+        
+        p->_suspend_update = true;
         p->unlock();
+        p->_suspend_update = false;
     }
 }