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3.
Pictures can be moved or scaled in the work station without
reference to GDDM.
Pictures that can be moved or scaled will have larger data streams
than those which cannot. In the case of complex pictures, data
streams may be more than doubled. Once the picture is in the work
station, viewing operations performed on the picture will not cause
any host or data stream activity. For pictures that are not defined
for local moving and scaling, a new picture data stream will be
transmitted for every viewing operation.
If there is insufficient segment memory available for GDDM to work in
retained mode, GDDM will automatically switch to unretained mode to
display the picture. In this mode, work station interaction with the
picture is not possible.
•
A large proportion of pictures will have better response time especially
where the host processor is either heavily loaded or of a small to
medium type. The type of picture that may give a worse response time
will contain a large number of short vectors.
Appendix D. GDDM Release
4
Performance Improvements
109
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