[webkit-dev] ［GTK］Scroll deficiency

[browserwk]

Dear all:

I am able to run webkit over directfb backend on arm platform - using
GtkLauncher .

The problem I face is that when I open
http://www.google.com/intl/en/privacy.html using this browser and scroll
the page; it results the visual area is not updated when scrolling, and
the screen display confusion.

Any ideas where to look to fix this issue ?

Appreciate any clues~

FYI:
[Following address are the screenshots]

Render OK when not scroll:
http://picasaweb.google.com/lh/photo/ybhIcahTEgsfBmMzXM13-g?feat=directlink

Render error when scroll:
http://picasaweb.google.com/lh/photo/0B8fi1ZTZ7hWH0S86a5RJA?feat=directlink
http://picasaweb.google.com/lh/photo/_ScHyJBOmJ8-xbRB_aZ2NQ?feat=directlink
http://picasaweb.google.com/lh/photo/Ael-gWdHEVnEtu_qbMFOZw?feat=directlink

BTW:
I am using following version of packages and running DirectFB without
any acceleration on my embeded target.
WebKit-r40777
gtk+-2.12.12
cairo-1.4.14
DirectFB-1.2.6

Thanks.

-xiong