various changes to rendering flow and structure

app/common/CMakeLists.txt

@@ -35,5 +35,7 @@ set(OLIVE_SOURCES
   common/threadedobject.cpp
   common/timecodefunctions.h
   common/timecodefunctions.cpp
+  common/timerange.h
+  common/timerange.cpp
   PARENT_SCOPE
 )

app/common/timerange.cpp

@@ -0,0 +1,51 @@
+#include "timerange.h"
+
+TimeRange::TimeRange()
+{
+}
+
+TimeRange::TimeRange(const rational &in, const rational &out) :
+  in_(in),
+  out_(out)
+{
+  normalize();
+}
+
+const rational &TimeRange::in() const
+{
+  return in_;
+}
+
+const rational &TimeRange::out() const
+{
+  return out_;
+}
+
+void TimeRange::set_in(const rational &in)
+{
+  in_ = in;
+  normalize();
+}
+
+void TimeRange::set_out(const rational &out)
+{
+  out_ = out;
+  normalize();
+}
+
+void TimeRange::set_range(const rational &in, const rational &out)
+{
+  in_ = in;
+  out_ = out;
+  normalize();
+}
+
+void TimeRange::normalize()
+{
+  // If `out` is earlier than `in`, swap them
+  if (out_ < in_) {
+    rational temp = in_;
+    in_ = out_;
+    out_ = temp;
+  }
+}

app/common/timerange.h

@@ -0,0 +1,25 @@
+#ifndef TIMERANGE_H
+#define TIMERANGE_H
+
+#include "rational.h"
+
+class TimeRange {
+public:
+  TimeRange();
+  TimeRange(const rational& in, const rational& out);
+
+  const rational& in() const;
+  const rational& out() const;
+
+  void set_in(const rational& in);
+  void set_out(const rational& out);
+  void set_range(const rational& in, const rational& out);
+
+private:
+  void normalize();
+
+  rational in_;
+  rational out_;
+};
+
+#endif // TIMERANGE_H