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X Input 2.3 Patches Bring Pointer Barrier Events

X.Org

Published on 07 December 2012 09:43 AM EST
Written by Michael Larabel in X.Org
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Peter Hutterer has published his patches for X Input 2.3, the next version of the X.Org Input extension that's likely to be merged into X.Org Server 1.14. The notable addition to X Input 2.3 is Pointer Barrier Events.

Pointer Barrier Events of Xi 2.3 make it where if a pointer hits one of these defined barriers, events are sent to selected clients. Via Barrier Release Requests, a client can "release" the pointer so that it can pass through the barrier with the next movement. The use-cases for Pointer Barrier Events is hot-corners/edges that respond to pushing against them (stemming from GNOME 3.x developer requests) and ad-hoc transparent barriers so depending upon the pointer speed the user can move the barrier (a request by Ubuntu's Unity developers).

Current issues with this work come down to grab behavior being different for other events, loss of Predictable Pointer Acceleration across a barrier, device-specific release isn't yet implemented, and a passive grab test is currently failing.

Aside from touching the X.Org Server, updating to X Input 2.3 also requires changes to inputproto, libXi, and the xorg-integration-tests.

Hutterer ends his mailing list post with "I think this is a valuable addition to 1.14, unless someone can find significant issues with the protocol as it is proposed here. Should we merge this for 1.14, I do reserve the right to disable this feature in the server before the release, unless we have a credible client-side implementation. We've learned the lesson with smooth scrolling that a server-implementation only is not good enough."

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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