tile
Returns the revision history for one tile owned by this source generation.
Repeated requests for the same identifier must observe one coherent increasing revision history. Ready images must exactly match the level's declared pixel size and edge pixels outside bounds must be transparent. The method must not block on network, disk, decoding, or rendering work; it may start or reference asynchronous application work through the returned source.
Return
externally owned revisioned presentation state.
Parameters
id
tile identifier whose level is contained in levels.
Throws
when id is not supported by this generation.
when the source cannot establish the requested state source before subscription.