paint
Emits immutable portable image data or an immutable native identifier into the current local display list.
This callback is cached and may not run in a later presentation. It must never invoke a native producer, acquire a source lease, perform readback, or put handles, closures, nodes, or hosts in a command. The destination is the complete positive logical PaintScope.size, using whole-image stretch and nearest sampling.
Parameters
scope
borrowed owner-thread paint scope, valid only until this method returns.
Throws
when command emission fails; no partially produced frame is published.