From 7434478a3567a0757791e1d231f9f60dbfdd8c10 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Wed, 8 Apr 2020 17:40:32 +0200
Subject: [PATCH] Update Waveform display when channel-count changes

---
 gtk2_ardour/audio_streamview.cc | 14 ++++++++++++++
 gtk2_ardour/audio_streamview.h  |  2 ++
 gtk2_ardour/route_time_axis.cc  |  9 +++++++++
 3 files changed, 25 insertions(+)

diff --git a/gtk2_ardour/audio_streamview.cc b/gtk2_ardour/audio_streamview.cc
index 58b55f94f2..fe9ace43cc 100644
--- a/gtk2_ardour/audio_streamview.cc
+++ b/gtk2_ardour/audio_streamview.cc
@@ -177,6 +177,20 @@ AudioStreamView::redisplay_track ()
 	layer_regions();
 }
 
+void
+AudioStreamView::reload_waves ()
+{
+	list<RegionView *>::iterator i;
+	for (i = region_views.begin(); i != region_views.end(); ++i) {
+		AudioRegionView* arv = dynamic_cast<AudioRegionView*> (*i);
+		if (!arv) {
+			continue;
+		}
+		arv->delete_waves();
+		arv->create_waves();
+	}
+}
+
 void
 AudioStreamView::setup_rec_box ()
 {
diff --git a/gtk2_ardour/audio_streamview.h b/gtk2_ardour/audio_streamview.h
index 47cc32fa25..b3bef6e127 100644
--- a/gtk2_ardour/audio_streamview.h
+++ b/gtk2_ardour/audio_streamview.h
@@ -67,6 +67,8 @@ public:
 	RegionView* create_region_view (boost::shared_ptr<ARDOUR::Region>, bool, bool);
 	void set_selected_points (PointSelection&);
 
+	void reload_waves ();
+
 private:
 	void setup_rec_box ();
 	void rec_peak_range_ready (samplepos_t start, ARDOUR::samplecnt_t cnt, boost::weak_ptr<ARDOUR::Source> src);
diff --git a/gtk2_ardour/route_time_axis.cc b/gtk2_ardour/route_time_axis.cc
index 5af14987ee..22f4c179de 100644
--- a/gtk2_ardour/route_time_axis.cc
+++ b/gtk2_ardour/route_time_axis.cc
@@ -2404,6 +2404,15 @@ RouteTimeAxisView::io_changed (IOChange /*change*/, void */*src*/)
 {
 	reset_meter ();
 	if (_route && !no_redraw) {
+		AudioStreamView* asv = dynamic_cast<AudioStreamView*>(_view);
+		if (asv) {
+			/* this needs to happen with the disk-reader's I/O changed,
+			 * however there is no dedicated signal for this, and in almost
+			 * call cases it follows I/O changes.
+			 * This is similar to ARDOUR_UI::cleanup_peakfiles, and
+			 * re-loads wave-form displays. */
+			asv->reload_waves ();
+		}
 		request_redraw ();
 	}
 }