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- EGLSurfaceRegistry owns the display, the surface records, the active surface, each thread's binding and the one recursive lock; BackendObject holds one and is its hooks, so the EGL virtuals keep their signatures and their defaults - the backends reach it through EGLRegistry(): lookups return copies, and the steps they compose (adopting an already-bound surface, a window's surfaces, a window's new extent) are named operations instead of writes to protected fields - WindowBackend and WindowHandle move with it - BackendObjectEglStateTest only re-points its accessors; the same 235 mutants, carried over, get the same verdicts except three that need a kind-None record, which no call can make, and one that cannot be written against the registry - comments that cited BackendObject.cpp line numbers name the function