[webkit-dev] [GTK]Scroll deficiency

Brent Fulgham bfulgham at gmail.com
Thu Mar 26 22:54:57 PDT 2009


I'm sorry you are encountering the problem, but I must admit I am glad  
someone else is seeing this issue as now we can pool our efforts to  
resolve it.

Since you are using directfb stuff, and I am on top of Windows, it  
seems the culprit is somewhere in the Cairo logic.  Perhaps the dirty  
regions are not being computed properly (I have encountered a few  
places where the coordinate systems in Cairo and Windows don't agree).

However, the kludge of setting a background color (does this work for  
you as well?) does not fit into the 'bad coordinate' theory, as I  
don't see how the presence of a background color in the rendering  
instructions would affect this.

The fact that it does not happen for me in Debug builds makes me  
wonder if maybe there is some kind of improper initialization or  
buffer overrun that is involved.


On Mar 26, 2009, at 10:48 PM, xiong wrote:

> Webkit r40777 Release builds for me.
> On Fri, Mar 27, 2009 at 1:25 PM, Brent Fulgham <bfulgham at gmail.com>  
> wrote:
> I wonder if your issue is related to one I documented on Windows  
> (using Cairo backend) a few months ago.  Currently this only happens  
> for me in Release builds, but it's still quite annoying.
> https://bugs.webkit.org/show_bug.cgi?id=22891
> I attached a few images in my bug for comparison.
> The easiest way to reproduce is to go to the http:// 
> planet.webkit.org and try to scroll up/down the page using the  
> scroll bar.  After a short while you will find areas of the page not  
> rendered.
> Thanks,
> -Brent
> On Mar 26, 2009, at 9:54 PM, browserwk wrote:
> 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
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> webkit-dev at lists.webkit.org
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