Computer graphics processing and selective visual display system – Computer graphic processing system – Integrated circuit
Patent
1995-07-05
1998-11-03
Hjerpe, Richard A.
Computer graphics processing and selective visual display system
Computer graphic processing system
Integrated circuit
345 2, 345508, G09G 500
Patent
active
058316396
ABSTRACT:
A remote control program (230) includes a scanning display driver (232) that interacts with the graphics display driver (112) of a host computer (110) to provide to the display (122) of the remote computer (120) an image (117) generated on the display (116) of the host computer (110). The scanning display driver (232) employs device independent function calls to the GDI (112) of the host computer (110) to eliminate any hardware dependent artifacts from the remote computer display (122). A scanning module (234) in the scanning display driver (112) retrieves bit map segments (119) of the image (117) on the host display (116), calculates a checksum value for comparison with a stored checksum value (542), updates the stored value (542) when the bit map segment (119) has been changed, and sets a flag (544) to indicate a new checksum value has been stored. An update module (236) scans the flags (544) and operates in conjunction with a communication module (240) to transfer changed bit map segments (119) to the remote computer (120). Transferred bit map segments (129) are stored in the remote computer (120) and used to refresh the image (127) on the remote display (122) until a new checksum value indicates that the bit map segment (119) on the host display (116) has been changed.
REFERENCES:
patent: 5136695 (1992-08-01), Goldshlag et al.
patent: 5341379 (1994-08-01), Crisp
patent: 5488702 (1996-01-01), Byers et al.
Chang Kent
Hjerpe Richard A.
Symantec Corporation
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