1995-03-20
1997-02-18
Nguyen, Phu K.
395685, G06F 940, G06F 946
Patent
active
056048491
ABSTRACT:
An overlay management system and method in which an overlay manager is invoked in response to execution of an original call to a subroutine, the original call being at a calling address. If the subroutine is not present in an executable portion of memory, the overlay manager loads the subroutine. The subroutine is unloaded by the overlay manager in response to an event or according to a predetermined criteria for memory management. When a call is initiated, the overlay manager determines the calling address and an identity of the subroutine being called. When the subroutine is loaded into the executable portion of memory, the system determines the address of the subroutine and rewrites the command at the calling address for directly calling the subroutine in the executable portion of memory. Once the subroutine is unloaded from executable memory, the system rewrites the command at the calling address to restore the original call. In a method of processing scenery data, the scenery data is categorized by content into a number of different resolutions wherein each resolution represents a predetermined geographic size. At each resolution, the visible content of the scenery is categorized into different scenery types. The scenery data is stored in a reduced data format so that at each resolution, each item of visible content at that resolution is stored as a scenery type having a location.
REFERENCES:
patent: 5117498 (1992-05-01), Miller et al.
patent: 5189733 (1993-02-01), Bennett et al.
patent: 5274817 (1993-12-01), Stahl
patent: 5299300 (1994-03-01), Femal et al.
Artwick Bruce A.
Randel Mark R.
Setzler Steven W.
Cave LLP Bryan
Klein David M.
Microsoft Corporation
Nguyen Phu K.
Vo Cliff N.
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