moved progress calculations from openglworker to transitionblock

These functions are universal transition functions that have use outside of
the OpenGL workers.

app/node/block/transition/transition.cpp

@@ -1,5 +1,7 @@
 #include "transition.h"
 
+#include "common/clamp.h"
+
 TransitionBlock::TransitionBlock() :
   connected_out_block_(nullptr),
   connected_in_block_(nullptr)
@@ -48,6 +50,44 @@ rational TransitionBlock::out_offset() const
   return 0;
 }
 
+Block *TransitionBlock::connected_out_block() const
+{
+  return connected_out_block_;
+}
+
+Block *TransitionBlock::connected_in_block() const
+{
+  return connected_in_block_;
+}
+
+double TransitionBlock::GetTotalProgress(const rational &time) const
+{
+  return GetInternalTransitionTime(time) / length().toDouble();
+}
+
+double TransitionBlock::GetOutProgress(const rational &time) const
+{
+  if (out_offset() == 0) {
+    return 0;
+  }
+
+  return clamp(1.0 - (GetInternalTransitionTime(time) / out_offset().toDouble()), 0.0, 1.0);
+}
+
+double TransitionBlock::GetInProgress(const rational &time) const
+{
+  if (in_offset() == 0) {
+    return 0;
+  }
+
+  return clamp((GetInternalTransitionTime(time) - out_offset().toDouble()) / in_offset().toDouble(), 0.0, 1.0);
+}
+
+double TransitionBlock::GetInternalTransitionTime(const rational &time) const
+{
+  return time.toDouble() - in().toDouble();
+}
+
 void TransitionBlock::BlockConnected(NodeEdgePtr edge)
 {
   if (!edge->output()->parentNode()->IsBlock()) {

app/node/block/transition/transition.h

@@ -21,7 +21,13 @@ public:
   Block* connected_out_block() const;
   Block* connected_in_block() const;
 
+  double GetTotalProgress(const rational& time) const;
+  double GetOutProgress(const rational& time) const;
+  double GetInProgress(const rational& time) const;
+
 private:
+  double GetInternalTransitionTime(const rational& time) const;
+
   NodeInput* out_block_input_;
 
   NodeInput* in_block_input_;