From f88cfdb47802241c306273d98f31538d44e6781a Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Sat, 20 Apr 2013 16:11:30 -0400
Subject: [PATCH] remove Editor::redraw_measures to improve efficiency of tempo
 measure line redraws

---
 gtk2_ardour/editor.cc              |  8 ++++++-
 gtk2_ardour/editor.h               |  1 -
 gtk2_ardour/editor_tempodisplay.cc | 36 +++++++++---------------------
 gtk2_ardour/public_editor.h        |  1 -
 4 files changed, 17 insertions(+), 29 deletions(-)

diff --git a/gtk2_ardour/editor.cc b/gtk2_ardour/editor.cc
index 96edd51af6..d458b41b84 100644
--- a/gtk2_ardour/editor.cc
+++ b/gtk2_ardour/editor.cc
@@ -3725,8 +3725,14 @@ Editor::set_show_measures (bool yn)
 			if (tempo_lines) {
 				tempo_lines->show();
 			}
-			(void) redraw_measures ();
+
+			ARDOUR::TempoMap::BBTPointList::const_iterator begin;
+			ARDOUR::TempoMap::BBTPointList::const_iterator end;
+			
+			compute_current_bbt_points (leftmost_frame, leftmost_frame + current_page_samples(), begin, end);
+			draw_measures (begin, end);
 		}
+
 		instant_save ();
 	}
 }
diff --git a/gtk2_ardour/editor.h b/gtk2_ardour/editor.h
index 768e524e3a..160400c22b 100644
--- a/gtk2_ardour/editor.h
+++ b/gtk2_ardour/editor.h
@@ -1489,7 +1489,6 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
 	void hide_measures ();
         void draw_measures (ARDOUR::TempoMap::BBTPointList::const_iterator& begin,
 			    ARDOUR::TempoMap::BBTPointList::const_iterator& end);
-	bool redraw_measures ();
 
 	void new_tempo_section ();
 
diff --git a/gtk2_ardour/editor_tempodisplay.cc b/gtk2_ardour/editor_tempodisplay.cc
index 4eb43ad53b..09d9b39c73 100644
--- a/gtk2_ardour/editor_tempodisplay.cc
+++ b/gtk2_ardour/editor_tempodisplay.cc
@@ -119,7 +119,7 @@ Editor::tempo_map_changed (const PropertyChange& /*ignored*/)
 
 	compute_current_bbt_points (leftmost_frame, leftmost_frame + current_page_samples(), begin, end);
 	_session->tempo_map().apply_with_metrics (*this, &Editor::draw_metric_marks); // redraw metric markers
-	redraw_measures ();
+	draw_measures (begin, end);
 	update_tempo_based_rulers (begin, end);
 }
 
@@ -130,22 +130,18 @@ Editor::redisplay_tempo (bool immediate_redraw)
 		return;
 	}
 
-	ARDOUR::TempoMap::BBTPointList::const_iterator current_bbt_points_begin;
-	ARDOUR::TempoMap::BBTPointList::const_iterator current_bbt_points_end;
-
-	compute_current_bbt_points (leftmost_frame, leftmost_frame + current_page_samples(),
-				    current_bbt_points_begin, current_bbt_points_end);
-
 	if (immediate_redraw) {
-		redraw_measures ();
+		ARDOUR::TempoMap::BBTPointList::const_iterator current_bbt_points_begin;
+		ARDOUR::TempoMap::BBTPointList::const_iterator current_bbt_points_end;
+		
+		compute_current_bbt_points (leftmost_frame, leftmost_frame + current_page_samples(),
+					    current_bbt_points_begin, current_bbt_points_end);
+		draw_measures (current_bbt_points_begin, current_bbt_points_end);
+		update_tempo_based_rulers (current_bbt_points_begin, current_bbt_points_end); // redraw rulers and measures
+	
 	} else {
-#ifdef GTKOSX
-		redraw_measures ();
-#else
-		Glib::signal_idle().connect (sigc::mem_fun (*this, &Editor::redraw_measures));
-#endif
+		Glib::signal_idle().connect (sigc::bind_return (sigc::bind (sigc::mem_fun (*this, &Editor::redisplay_tempo), true), false));
 	}
-	update_tempo_based_rulers (current_bbt_points_begin, current_bbt_points_end); // redraw rulers and measures
 }
 
 void
@@ -170,18 +166,6 @@ Editor::hide_measures ()
 		tempo_lines->hide();
 }
 
-bool
-Editor::redraw_measures ()
-{
-	ARDOUR::TempoMap::BBTPointList::const_iterator begin;
-	ARDOUR::TempoMap::BBTPointList::const_iterator end;
-
-	compute_current_bbt_points (leftmost_frame, leftmost_frame + current_page_samples(), begin, end);
-        draw_measures (begin, end);
-
-	return false;
-}
-
 void
 Editor::draw_measures (ARDOUR::TempoMap::BBTPointList::const_iterator& begin,
 		       ARDOUR::TempoMap::BBTPointList::const_iterator& end)
diff --git a/gtk2_ardour/public_editor.h b/gtk2_ardour/public_editor.h
index 12f4cd0ec7..d95b29d814 100644
--- a/gtk2_ardour/public_editor.h
+++ b/gtk2_ardour/public_editor.h
@@ -212,7 +212,6 @@ class PublicEditor : public Gtk::Window, public PBD::StatefulDestructible {
 	virtual void maybe_locate_with_edit_preroll (framepos_t location) = 0;
 	virtual void set_show_measures (bool yn) = 0;
 	virtual bool show_measures () const = 0;
-	virtual bool redraw_measures () = 0;
 
 	virtual Editing::MouseMode effective_mouse_mode () const = 0;