virtual bool set_param(const String ¶m, const ValueBase &value);
virtual ValueBase get_param(const String ¶m)const;
virtual Color get_color(Context context, const Point &pos)const;
virtual bool accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const;
virtual bool set_param(const String ¶m, const ValueBase &value);
virtual ValueBase get_param(const String ¶m)const;
virtual Color get_color(Context context, const Point &pos)const;
virtual bool accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const;