[webkit-dev] WebKit zooming behavior

[David Hyatt]

That API is more about desktop zooming.  I wouldn't really recommend  
using it as a model for zooming on a mobile platform.

dave
(hyatt at apple.com)

On Jun 25, 2009, at 12:15 PM, Javed Rabbani wrote:

> Hello everyone,
>
> I was trying to zoom a web page (text + images) through WebKit API:  
> frame->setZoomFactor(). The call forces WebKit to recalculate the  
> page layout and send repaints to the application via Chrome Client.  
> What I have noticed is that zooming takes considerable time and that  
> effect becomes more evident running on an embedded platform. The  
> number of repaint calls that are routed to the application through  
> Chrome Client are far more than for the case when the page is  
> displayed without zooming.
>
> As a result, from the user point of view, the zooming operation  
> takes considerable time that is proportional to the content length  
> of the page being displayed. For instance if BBC mobile is  
> displayed, the page is zoomed quickly from zoom factor of 1.0 to  
> 1.2. However, for edition.cnn.com, it takes quite a few seconds to  
> complete and there are far more repaint calls sent to the  
> application. Is this the normal behavior? Is there a way to get this  
> done in a much quicker way, even for sites with more content? Any  
> suggestion in this regard will be greatly appreciated. Thanks.
>
> Regards,
> Javed
>
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