[OpenJDK 2D-Dev] request for review: JDK-8007386 On physical machine (video card is Intel Q45)the case of text is blank.

Phil Race philip.race at oracle.com
Sat Sep 28 22:05:55 UTC 2013


Shouldn't most of this be inside an "ifdef _linux_ ?
Solaris & (currently) even MacOS will compile this code.


On 9/28/13 12:26 PM, Clemens Eisserer wrote:
> Hi,
> Please review my fix for "JDK-8007386 On physical machine (video card
> is Intel Q45)the case of text is blank." at:
> http://cr.openjdk.java.net/~ceisserer/8007386/webrev.01/
> Problem description:
> There has been a number of bug reports by users enabling the xrender
> pipeline on outdated systems (old but still supported RHEL and SLES
> releases). Sympthoms are hangs (old libXrender version from ~2007) and
> rendering corruptions caused by driver bugs.
> There have been attempts like parsing the version of libXrender from
> package-info files, however (as distributions don't tend to agree
> sometimes) this approach fails e.g. on older SLES releases.
> Unfortunately a very widespread driver bug was shipped in the intel
> video driver with Ubuntu 2012.04 LTS (fixed in 2012.04.02), which
> means also not-that-outdated systems are affected - and driver
> versions can only be detected by parsing Xorg.log. (
> https://bugs.freedesktop.org/show_bug.cgi?id=48045 )
> Fix description:
> As discussed with Phil, I propose a drastic measure: Defaults to X11
> on systems running Linux < 3.5 (Ubuntu <= 12.04.01).
> When -Dsun.java2d.xrender=true/True is explicitly specified on the
> command line, the pipeline will be enabled regardless of the
> kernel-version detected.
> I know it is not elegant to base this descision on the kernel-version, however:
> - We don't have to parse e.g. /var/log/Xorg and guess arround which
> versions of which libraries/drivers/xorg/... are installed
> - Change-sensitive RHEL and SLES users will stay at X11 until they upgrade
> Also related are bugs:
> JDK-8016113 Swing components rendered incorrectly with Nimbus Look and
> Feel on SLES
> 7032904(XRender: Java2Demo : Infinite loop in
> Java_sun_java2d_loops_MaskBlit_MaskBlit on OEL 5.6 x64)
> Thanks, Clemens

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