[webkit-dev] The mysterious IconDatabase

Patrick Hanna phanna at email.unc.edu
Tue Sep 18 09:27:34 PDT 2007

I am having trouble using the IconDatabase successfully. I was  
wondering if I am either using it incorrectly or if Safari is doing  
some extra work to get the correct favicon for a given site.

Here is the scenario. I am going to assume that each icon is retained  
at least once so that icons are never deleted (in fact, for testing  
this is exactly what I'm doing).

Load www.google.com, FrameLoaderClient::dispatchDidReceiveIcon is  
called. IconDatabase::iconForPageURL returns an icon, this is  
perfect. Load www.google.com/search?hl=en&q=some_query&btnG=Google 
+Search, dispatchDidReceiveIcon is *not* called. If I call  
iconForPageURL *before* the load is finished, I won't get an icon  
unless I have already visited the site. If I call it after the load  
has finished, this could potentially show the wrong icon until the  
load has finished.

Here is the behavior that I want:
Load www.google.com, show the default icon until the google favicon  
is loaded and dispatchDidReceiveIcon is called. Load www.google.com/ 
search?hl=whatever, show the google favicon unless  
dispatchDidReceiveIcon is called. Load www.someothersite.com, show  
the default icon until dispatchDidReceiveIcon is called. How can I  
accomplish this behavior when the IconDatabase doesn't know about  
pageUrls->iconUrls until *after* the load has completed?


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