[Webkit-unassigned] [Bug 24468] Big performance improvement to FontQt.cpp and hence all text drawing and layouting in QtWebKit

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Mar 9 13:27:54 PDT 2009


------- Comment #1 from treat at kde.org  2009-03-09 13:27 PDT -------
The patches attached improve this situation by *never* detaching or recreating
a new QString for these operations on a TextRun.

The first patch is a patch to Qt itself that exposes two new methods in the
QFont class which allow an application to pass a substitution map to Qt's
underlying text engine.  I've only implemented the patch for the Freetype
engine in Qt, but other engines could/should be made to honor these

The second patch is a patch to FontQt.cpp in WebCore that utilizes the new API
in Qfont.

Together these two patches effectively eliminate the cost of the current method
of doing things in FontQt.cpp.


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