sequence duplication for #97

effects/crossdissolvetransition.cpp

@@ -11,3 +11,7 @@ void CrossDissolveTransition::process_transition(float progress) {
     glGetFloatv(GL_CURRENT_COLOR, color);
     glColor4f(1.0, 1.0, 1.0, color[3]*progress);
 }
+
+Transition* CrossDissolveTransition::copy() {
+    return new CrossDissolveTransition();
+}

effects/transition.cpp

@@ -4,4 +4,8 @@ Transition::Transition() {
     length = 30;
 }
 
+Transition* Transition::copy() {
+    return new Transition();
+}
+
 void Transition::process_transition(float) {}

effects/transition.h

@@ -10,12 +10,14 @@ public:
     int length;
     QString name;
     virtual void process_transition(float);
+    virtual Transition* copy();
 };
 
 class CrossDissolveTransition : public Transition {
 public:
     CrossDissolveTransition();
     void process_transition(float);
+    Transition* copy();
 };
 
 #endif // TRANSITION_H