Refactor SDL overlay drawing into OverlayManager for sharing with other renderers

app/streaming/video/overlaymanager.h

@@ -3,6 +3,7 @@
 #include <QString>
 
 #include <SDL.h>
+#include <SDL_ttf.h>
 
 namespace Overlay {
 
@@ -24,6 +25,7 @@ class OverlayManager
 {
 public:
     OverlayManager();
+    ~OverlayManager();
 
     bool isOverlayEnabled(OverlayType type);
     char* getOverlayText(OverlayType type);
@@ -31,16 +33,24 @@ public:
     void setOverlayState(OverlayType type, bool enabled);
     SDL_Color getOverlayColor(OverlayType type);
     int getOverlayFontSize(OverlayType type);
+    SDL_Surface* getUpdatedOverlaySurface(OverlayType type);
 
     void setOverlayRenderer(IOverlayRenderer* renderer);
 
+private:
+    void notifyOverlayUpdated(OverlayType type);
+
     struct {
         bool enabled;
         int fontSize;
         SDL_Color color;
         char text[512];
+
+        TTF_Font* font;
+        SDL_Surface* surface;
     } m_Overlays[OverlayMax];
     IOverlayRenderer* m_Renderer;
+    QByteArray m_FontData;
 };
 
 }