a first attempt at a new render system

app/render/playbackcache.h

@@ -0,0 +1,72 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef PLAYBACKCACHE_H
+#define PLAYBACKCACHE_H
+
+#include <QObject>
+
+#include "common/timerange.h"
+
+OLIVE_NAMESPACE_ENTER
+
+class PlaybackCache : public QObject
+{
+    Q_OBJECT
+public:
+  PlaybackCache();
+
+  void Invalidate(const TimeRange& r);
+
+  void SetLength(const rational& r);
+
+  bool IsFullyValidated() const;
+
+  const TimeRangeList& GetInvalidatedRanges() const
+  {
+    return invalidated_;
+  }
+
+signals:
+  void Invalidated(const TimeRange& r);
+
+  void Validated(const TimeRange& r);
+
+  void LengthChanged(const rational& r);
+
+protected:
+  void Validate(const TimeRange& r);
+
+  void InvalidateAll();
+
+  virtual void LengthChangedEvent(const rational& old, const rational& newlen);
+
+  virtual void InvalidateEvent(const TimeRange& range);
+
+private:
+  TimeRangeList invalidated_;
+
+  rational length_;
+
+};
+
+OLIVE_NAMESPACE_EXIT
+
+#endif // PLAYBACKCACHE_H