39     Status status = Status::Synced;  member
68         if (status == Status::Drawing) return Result::InsufficientCondition;  in push()
86         status = Status::Synced;  in clear()
93         if (paints.empty() || status == Status::Drawing) return Result::InsufficientCondition;  in update()
97         if (status == Status::Damaged || force) flag = RenderUpdateFlag::All;  in update()
108         status = Status::Updating;  in update()
114         if (status == Status::Damaged) update(nullptr, false);  in draw()
115 …if (status == Status::Drawing || paints.empty() || !renderer->preRender()) return Result::Insuffic…  in draw()
124         status = Status::Drawing;  in draw()
130 …   if (status == Status::Synced || status == Status::Damaged) return Result::InsufficientCondition;  in sync()
133             status = Status::Synced;  in sync()
142 …   if (status != Status::Damaged && status != Status::Synced) return Result::InsufficientCondition;  in viewport()
153         status = Status::Damaged;  in viewport()