In BeOS BView::Invalidate() sends message to app_server requesting region update. We are doing drawing in-process, so we send UPDATE message to BView instead. It is handled as a BView::Draw() call in a clipped Skia Canvas rectangle. There is one Skia Canvas per window, exposed by private accessor function.
We do not make shared private implementations. Every class contains its pimpl in its own .cpp file. If there is a need to expose parts of private implementation it is done via private accessor functions exposing pointers to daclaration-only class. This allows friend class to #include full class implementation header and use the exposed pointer directly.
Private non-virtual accessor functions do not change class ABI, so we are free to add/remove these as needed.
- Private methods are prefixed with
_ - Method out-parameters are prefixed with
_in implementation