From b3040a31fc07cb83935db1180f9e75ec5566b849 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Thu, 4 May 2023 13:39:53 -0600
Subject: [PATCH] temporal: a basic data structure to hold the result of a
 TempoMap cut/copy operation

---
 libs/temporal/tempo.cc         | 51 ++++++++++++++++++++++++++++++++++
 libs/temporal/temporal/tempo.h | 38 +++++++++++++++++++++++++
 2 files changed, 89 insertions(+)

diff --git a/libs/temporal/tempo.cc b/libs/temporal/tempo.cc
index 8bdd3f4824..9195043b46 100644
--- a/libs/temporal/tempo.cc
+++ b/libs/temporal/tempo.cc
@@ -4510,3 +4510,54 @@ DomainSwapInformation::undo ()
 
 	clear ();
 }
+
+TempoMapCutBuffer::TempoMapCutBuffer (timecnt_t const & dur, TempoMetric const & start, TempoMetric const & end)
+	: _start_metric (start)
+	, _end_metric (end)
+	, _duration (dur)
+{
+}
+
+void
+TempoMapCutBuffer::add (TempoPoint const & tp)
+{
+	TempoPoint* ntp = new TempoPoint (tp);
+
+	ntp->set (tp.sclock() - _duration.position().superclocks(), tp.beats(), tp.bbt());
+
+	_tempos.push_back (*ntp);
+	_points.push_back (*ntp);
+}
+
+void
+TempoMapCutBuffer::add (MeterPoint const & mp)
+{
+	MeterPoint* ntp = new MeterPoint (mp);
+
+	ntp->set (mp.sclock() - _duration.position().superclocks(), mp.beats(), mp.bbt());
+
+	_meters.push_back (*ntp);
+	_points.push_back (*ntp);
+}
+
+void
+TempoMapCutBuffer::add (MusicTimePoint const & mtp)
+{
+	MusicTimePoint* ntp = new MusicTimePoint (mtp);
+
+	ntp->set (mtp.sclock() - _duration.position().superclocks(), mtp.beats(), mtp.bbt());
+
+	_bartimes.push_back (*ntp);
+	_tempos.push_back (*ntp);
+	_meters.push_back (*ntp);
+	_points.push_back (*ntp);
+}
+
+void
+TempoMapCutBuffer::clear ()
+{
+	_tempos.clear ();
+	_meters.clear ();
+	_bartimes.clear ();
+	_points.clear ();
+}
diff --git a/libs/temporal/temporal/tempo.h b/libs/temporal/temporal/tempo.h
index aac5940751..cd94061b45 100644
--- a/libs/temporal/temporal/tempo.h
+++ b/libs/temporal/temporal/tempo.h
@@ -1144,6 +1144,44 @@ class /*LIBTEMPORAL_API*/ TempoMap : public PBD::StatefulDestructible
 	void drop_lookup_table ();
 };
 
+class LIBTEMPORAL_API TempoMapCutBuffer
+{
+  public:
+	TempoMapCutBuffer (timecnt_t const &, TempoMetric const &, TempoMetric const &);
+
+	timecnt_t duration() const { return _duration; }
+
+	TempoMetric const & metric_at_start () const { return _start_metric; }
+	TempoMetric const & metric_at_end () const { return _end_metric; }
+
+	typedef boost::intrusive::list<TempoPoint, boost::intrusive::base_hook<tempo_hook>> Tempos;
+	typedef boost::intrusive::list<MeterPoint, boost::intrusive::base_hook<meter_hook>> Meters;
+	typedef boost::intrusive::list<MusicTimePoint, boost::intrusive::base_hook<bartime_hook>> MusicTimes;
+	typedef boost::intrusive::list<Point, boost::intrusive::base_hook<point_hook>> Points;
+
+	void add (TempoPoint const &);
+	void add (MeterPoint const &);
+	void add (MusicTimePoint const &);
+	void add (Point const &);
+
+	void clear ();
+
+	Tempos const & tempos() const { return _tempos; }
+	Meters const & meters() const { return _meters; }
+	MusicTimes const & bartimes() const { return _bartimes; }
+	Points const & points() const { return _points; }
+
+  private:
+	TempoMetric _start_metric;
+	TempoMetric _end_metric;
+	timecnt_t   _duration;
+
+	Tempos       _tempos;
+	Meters       _meters;
+	MusicTimes   _bartimes;
+	Points       _points;
+};
+
 class LIBTEMPORAL_API TempoCommand : public Command {
 	public: