moved things around and started rewriting render backend

app/threading/threadticket.cpp

@@ -0,0 +1,119 @@
+/***
+
+  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 "threadticket.h"
+
+OLIVE_NAMESPACE_ENTER
+
+RenderTicket::RenderTicket() :
+  started_(false),
+  finished_(false),
+  cancelled_(false)
+{
+  SetJobTime();
+}
+
+void RenderTicket::WaitForFinished()
+{
+  QMutexLocker locker(&lock_);
+
+  if (!finished_) {
+    wait_.wait(&lock_);
+  }
+}
+
+QVariant RenderTicket::Get()
+{
+  WaitForFinished();
+
+  // We don't have to mutex around this because there is no way to write to `result_` after
+  // the ticket has finished and the above function blocks the calling thread until it is finished
+  return result_;
+}
+
+bool RenderTicket::IsFinished(bool lock)
+{
+  if (lock) {
+    lock_.lock();
+  }
+
+  bool finished = finished_;
+
+  if (lock) {
+    lock_.unlock();
+  }
+
+  return finished;
+}
+
+bool RenderTicket::WasCancelled()
+{
+  QMutexLocker locker(&lock_);
+
+  return cancelled_;
+}
+
+void RenderTicket::Start()
+{
+  QMutexLocker locker(&lock_);
+
+  if (!started_ && !finished_) {
+    started_ = true;
+  }
+}
+
+void RenderTicket::Finish(QVariant result, bool cancelled)
+{
+  QMutexLocker locker(&lock_);
+
+  if (started_ && !finished_) {
+    finished_ = true;
+    cancelled_ = cancelled;
+
+    result_ = result;
+
+    wait_.wakeAll();
+
+    locker.unlock();
+
+    emit Finished();
+  }
+}
+
+void RenderTicket::Cancel()
+{
+  QMutexLocker locker(&lock_);
+
+  if (!finished_) {
+    cancelled_ = true;
+
+    if (!started_) {
+      finished_ = true;
+
+      wait_.wakeAll();
+
+      locker.unlock();
+
+      emit Finished();
+    }
+  }
+}
+
+OLIVE_NAMESPACE_EXIT