+ std::map<unsigned, int> channel_signals; // Set using Nageru.set_channel_signal(). Protected by <m>.
+ std::map<unsigned, bool> channel_supports_wb; // Set using Nageru.set_supports_wb(). Protected by <m>.
+
+ // Used to construct OpenGL contexts for VideoInputs. Needs to be available
+ // during the entire lifetime of Theme, since they may be created basically
+ // at any time.
+ const QSurface *surface;