On 21/03/2019 20.51, Dennis New wrote:
What are they? There is a miscellaneous settings option for them: "Use
saveunders to reduce window exposures" - what does that mean and what
are the pros and cons of enabling them?
Once upon a time the X11 server (optionally) had this feature where
clients could request the server to use "save-unders" per window.
This would mean that the server would store the obscured pixels
underneath windows with save-unders enabled, and restore them when the
window was unmapped, thus potentially avoiding that the client should
re-render them.
The result would be a much faster update at the expense of increased
memory usage in the X-server.
When compositing came around the save-unders feature more or less became
irrelevant, at least when using compositing.
AFAIK the save-unders feature was removed from Xorg about a decade ago,
so the e16 option is probably only useful if you have a really ancient
X-server.
The option should probably just be removed from the "Miscellaneous
Settings" dialog as it's no longer generally useful.
/Kim
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