Helper: get the active display via a temporary UITestEngine

Direct access - used only for serialization

Convenience: build a descriptor from a raw legacy int.

Inline validation helpers (used across split files)

optimized scale calculation

Helper: simulate JIP queue add/replace logic (mirrors server code)

Must be const to work with both ScopeLock (const Lock*) and ScopeUnlock (const& bug)

return magazine with index i

Access control

number of frames currently queued

get() returns -1 at EOF; mask each byte and combine in unsigned so a -1 never becomes a negative shift and a high byte never overflows int (both UB).

Helper function to create temporary file

Generation 0 is reserved as the "never assigned" sentinel.

no texture animation

number of magazines

Synthetic draw with a sensible default descriptor.