KWin In KDE 4.11 Moves Along With Using XCB
Written by Michael Larabel in KDE on 7 January 2013 at 01:19 PM EST. 9 Comments
KWin, KDE's window manager, in version 4.11 is moving along with being ported to using XCB rather than Xlib.

Back in November I wrote that KWin was being ported to XCB and that with the KDE 4.10 feature window closing that this was a candidate for merging. Besides moving from Xlib to XCB, other KWin action items for the 4.11 window are AppMenu support, color correction work, performance improvements in compositing environments, improving window decorations, and more.

In a new blog post by KWin's Martin Gräßlin, he confirms this XCB porting work is ongoing. "With Christmas break over there is again quite some work happening for KWin. Of course given that 4.10 is close by a few bugs got fixed, but with master open for 4.11 we also have the first feature commits. Most of it is in the area of porting KWin to XCB. Those changes are not listed, but they are quite nice as each of them brings a small improvement due to the asynchronous nature of XCB."

XCB are the C bindings for X and has long been intended as a replacement to Xlib while reducing the size and complexity of the X library and providing direct access for tapping the X11 protocol. Over Xlib, XCB also allows for better multi-threading and a-synchronous support.

One of the main motivations for KWin finally transitioning over to XCB is that the Qt 5.0 tool-kit no longer uses Xlib. For Qt5 compatibility, XCB is mandated and thanks to improvements in the Linux graphics stack it will be possible to eventually bypass Xlib completely from KWin by using XCB and EGL.
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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 Twitter or contacted via MichaelLarabel.com.

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