Object oriented video framework system
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United States of America Patent
Stats
-
Nov 28, 1995
Grant Date -
N/A
app pub date -
Jul 27, 1993
filing date -
Jul 27, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
A video framework for use in a data processing system provides parallel hierarchies of video device drivers and video device handles, which are created by video device driver objects, and a hierarchy of data encapsulators contained by a subclass of the hierarchy of video device handles to encapsulate configuration information describing the functionality of a display device connected to a data processing system. Applications access video device drivers through ones of the video device handles at respective levels of the video device handle hierarchy. When a change of configuration is made or requested in for the data processing system or any display connected thereto, corresponding video display handles issue a signal to lock down drawing tasks before video handles are created or altered to carry out the configuration change. The video framework thus allows changes to be made in configuration of the system and/or functionality of the display devices without loss of information displayed to a user and maintains a default functionality of displays connected to the data processing system.
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