See https://bugreports.qt-project.org/browse/QTBUG-18980
The work is in progress and would probably be targetted to 5.1 or 5.2. Konstantin 2012/9/22 Mark <[email protected]>: > On Sat, Sep 22, 2012 at 3:03 PM, Mark <[email protected]> wrote: >> Hi, >> >> I actually came across this one by accident. I was playing with >> qtperf4 [1] and was profiling the "QTextEdit - add text" since that >> seems a bit slow and equally slow on raster and native. So, after >> profiling it turns out that the vast majority of that benchmark is >> spending it's time in qShapeItem which in turn ends up (after a bunch >> of calls) in HB_GPOS_Apply_String and HB_GSUB_Apply_String. About >> 4/5th of the benchmark time is spend there. >> >> So i was wondering if Qt was using the latest harfbuzz which >> apparently isn't the case. It's not even visible which version Qt >> ships by default, but it is visible that the current harfbuzz >> development is a lot further [2]. >> >> Note: the above mentioned profiling was on Qt 4.8.3, not 5.0 beta, >> >> Cheers, >> Mark >> >> [1] http://code.google.com/p/qtperf/ >> [2] http://cgit.freedesktop.org/harfbuzz/ > > For reference, the 0.9.2 release > https://mail.gnome.org/archives/gnome-announce-list/2012-August/msg00024.html > which also notes: "I can finally claim that new HarfBuzz is in par > with or better than both Pango and old.HarfBuzz / Qt." > _______________________________________________ > Development mailing list > [email protected] > http://lists.qt-project.org/mailman/listinfo/development _______________________________________________ Development mailing list [email protected] http://lists.qt-project.org/mailman/listinfo/development
