began support of timeline tracks/channels

app/node/blend/alphaover/alphaover.cpp

@@ -0,0 +1,17 @@
+#include "alphaover.h"
+
+AlphaOverBlend::AlphaOverBlend()
+{
+
+}
+
+void AlphaOverBlend::Process(const rational &time)
+{
+  Q_UNUSED(time)
+
+  // FIXME: Write Alpha Over Formula
+
+  // Note that alpha will always be premultiplied by this point
+
+  //GLuint base_tex = base_input_->get_value(time).value<GLuint>();
+}