[Webkit-unassigned] [Bug 24469] New: Big performance improvement to FontQt.cpp and hence all text drawing and layouting in QtWebKit

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=24469

           Summary: Big performance improvement to FontQt.cpp and hence all
                    text drawing and layouting in QtWebKit
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: treat at kde.org


Hi,

Currently the QtWebKit class FontQt.cpp is using a very expensive method to
effectively inform Qt's text engine that it should substitute glyphs for
particular unicode characters with another unicode character.  Right now
FontQt.cpp is reconstructing a QString based on a TextRun and then detaching
and memcpy'ing  whenever it encounters a character that should be treated
differently by Qt's text engine according to WebCore::Font::treatAsSpace and
WebCore::Font::treatAsZeroWidthSpace.

Profiling shows that this is one of the top ten most expensive methods in all
of QtWebKit right now.


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