Add option to leave vertical gap below audio regions

This is a backport from Mixbus, to leave are 4 "open" pixels
at the bottom of the track so one can see the grid-lines between tracks.

This is useful with low region-transparency. grid-lines behind
opaque regions are not visible.

1 files changed, 8 insertions, 0 deletions

diff --git a/gtk2_ardour/audio_region_view.cc b/gtk2_ardour/audio_region_view.cc
index 419d885c51..0d744874e9 100644
--- a/gtk2_ardour/audio_region_view.cc
+++ b/gtk2_ardour/audio_region_view.cc
@@ -538,6 +538,14 @@ AudioRegionView::setup_fade_handle_positions()
 void
 AudioRegionView::set_height (gdouble height)
 {
+	uint32_t gap = UIConfiguration::instance().get_vertical_region_gap ();
+	float ui_scale = UIConfiguration::instance().get_ui_scale ();
+	if (gap > 0 && ui_scale > 0) {
+		gap = ceil (gap * ui_scale);
+	}
+
+	height = std::max (3.0, height - gap);
+
 	if (height == _height) {
 		return;
 	}