These hints allow an acceleration architecture to optimize allocation of certain
types of pixmaps, such as pixmaps that will serve as backing pixmaps for
redirected windows.
This was an attempt to avoid scratch gc creation and validation for paintwin
because that was expensive. This is not the case in current servers, and the
danger of failure to implement it correctly (as seen in all previous
implementations) is high enough to justify removing it. No performance
difference detected with x11perf -create -move -resize -circulate on Xvfb.
Leave the screen hooks for PaintWindow* in for now to avoid ABI change.
Composite's automatic redirection is a more general mechanism than the
ad-hoc BS machinery, so it's much prettier to implement the one in terms
of the other. Composite now wraps ChangeWindowAttributes and activates
automatic redirection for windows with backing store requested. The old
backing store infrastructure is completely gutted: ABI-visible structures
retain the function pointers, but they never get called, and all the
open-coded conditionals throughout the DIX layer to implement BS are gone.
Note that this is still not a strictly complete implementation of backing
store, since Composite will throw the bits away on unmap and therefore
WhenMapped and Always hints are equivalent.
LessThan/GreaterThan comparisons were used in the wakeup handler,
and LessOrEqual/GreaterOrEqual in the block handler.
Change it to use LessOrEqual/GreaterOrEqual in both functions,
since this is what XSyncNegativeComparison and
XSyncPositiveComparison imply.
Allow the location of the SERVERCONFIGdir variable to be defined at
compile-time. This allows us to specify where the security policy will be
located (Debian uses this to put it in /etc). The default is to the
previous location.
This counter exposes the time in milliseconds since the last
input event. Clients such as screen savers and power managers
can set an alarm on this counter to find out when the idle time
reaches a certain value, without having to poll the server.
The former <X11/extensions/XKBsrv.h> has been pulled into the server now as
include/xkbsrv.h, and the world updated to look for it in the new place,
since it made no sense to define server API in an extension header. Any
further work along this line will need to do similar things with XKBgeom.h
and friends.
- Better estimate general pixmap memory usage.
- Account for pixmaps shared between clients.
- Account for window background and border pixmaps,
and GC stripple and tile pixmaps.
