[Webkit-unassigned] [Bug 14998] Full page zooming support

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=14998





------- Comment #10 from freyther at handhelds.org  2007-08-24 07:33 PDT -------
(In reply to comment #8)
> There seem to be severe performance issues with non-integral scale factors.
> i.e. - if scaleFactor is set to 1.2, performance is noticeably laggy, and
> scrolling complex pages (such as BBC news) is so slow it's unusable.
> 
> Scaling down also seems to have trouble, but I'm not sure why. The layout of
> the entire page is completely broken and half the page doesn't seem to be
> rendered.
> 
> Does anyone have any suggestions for performance improvements?

No just a small suggestions on how to identify the offender.

a) tronical (Simon) did implement zooming for konqueror embedded, you might ask
him for his approach back then.
b) I think it is important to either identify Gtk+, WebCore or cairo as
offender. I would look into callgrind/kcallgrind and if that turns out to be
too slow would go to oprofile and LinuxTracingToolkit (LTT) to find out where
the time is spend. To be able to replicate your testing you might want to drive
scrolling programatically by manipulating the GtkAdjustment that get set on the
WebKitGtkPage.


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