Computer-implemented process and computer system for raster displaying video data using foreground and background commands
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United States of America Patent
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May 27, 1997
Issued Date -
N/A
app pub date -
Mar 16, 1995
filing date -
Nov 12, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Video data for two or more video streams are processed by a single background command list containing one or more background commands and a single foreground command list containing one or more foreground commands, where the foreground command list is implemented only during a vertical blanking interval of the display raster of a monitor. The processed video data are then displayed during the raster period. In a preferred embodiment, if the implementation of a background command has not completed by the start of a vertical blanking interval, the background command is interrupted, the state of the background command implementation is saved, the foreground command list is implemented, and then the interrupted background command is resumed. The background commands are preferably those that do not directly affect the display bitmaps, while the foreground commands are those that do directly affect the display bitmaps. The invention assures proper synchronization of video data processing and raster-based video display.
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