a first attempt at a new render system

app/render/playbackcache.cpp

@@ -0,0 +1,84 @@
+/***
+
+  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/>.
+
+***/
+
+#include "playbackcache.h"
+
+OLIVE_NAMESPACE_ENTER
+
+PlaybackCache::PlaybackCache()
+{
+
+}
+
+void PlaybackCache::Invalidate(const TimeRange &r)
+{
+  invalidated_.InsertTimeRange(r);
+
+  InvalidateEvent(r);
+
+  emit Invalidated(r);
+}
+
+void PlaybackCache::SetLength(const rational &r)
+{
+  if (length_ == r) {
+    // Same length - do nothing
+    return;
+  }
+
+  if (r > length_) {
+    // If new length is greater, simply extend the invalidated range for now
+    invalidated_.InsertTimeRange(TimeRange(r, length_));
+  } else {
+    // If new length is smaller, removed hashes
+    invalidated_.RemoveTimeRange(TimeRange(length_, r));
+  }
+
+  LengthChangedEvent(length_, r);
+
+  length_ = r;
+}
+
+bool PlaybackCache::IsFullyValidated() const
+{
+  return invalidated_.isEmpty();
+}
+
+void PlaybackCache::Validate(const TimeRange &r)
+{
+  invalidated_.RemoveTimeRange(r);
+
+  emit Validated(r);
+}
+
+void PlaybackCache::InvalidateAll()
+{
+  Invalidate(TimeRange(0, length_));
+}
+
+void PlaybackCache::LengthChangedEvent(const rational &, const rational &)
+{
+}
+
+void PlaybackCache::InvalidateEvent(const TimeRange &)
+{
+}
+
+OLIVE_NAMESPACE_EXIT