Adding icon cache to kdelibs?

[Lubos Lunak]

On čt 21. června 2007, Rivo Laks wrote:
> Ühel kenal päeval (neljapäev 21 juuni 2007) kirjutas Rex Dieter:
> > Rivo, since an implementation of an icon cache already exists (gtk2), any
> > interest in coordinating a common implementation?
> >
> > I ask selfishly, since I've been trying for ages to make icon handling
> > "just work" for Fedora, but have been meeting with some resistance (ie,
> > *every* icon-installing pkg currently must run/use gtk-update-icon-cache,
> > which I think is utter silliness).  See also:
> > http://fedoraproject.org/wiki/PackagingDrafts/ScriptletSnippets/iconcache
>
> I don't think what I'm working on would be compatible with the GTK
> implementation.
> GTK implementation seems to be about putting all of icontheme's icons into
> one file and then mmapping it so the icons would be shared between apps (I
> might be wrong though since I'm not that familiar with gtk's cache).

 That is correct, AFAIK - the reasons for the gtk icon cache were that gtk for 
some reason wastes quite some memory and mmaping the icon data as shared 
memory helps. (BTW, your iconcache simply reading the data from QFile and not 
using mmap is final solution? If yes, it might make sense to measure its 
overhead.)

 Moreover I think that something like a cache is rather toolkit-specific and 
having something like a spec for the actual cache would hinder its 
development.

> My implementation caches only icons which have actually been used, in a
> compressed form. It's also not strictly icontheme specific, e.g. if oxygen
> theme inherits hicolor theme then both icons will end up in one cache (not
> sure how gtk cache handles it). Also, in addition to png images, it can
> cache icons rendered from svg files.
>
> BTW, is running gtk-update-icon-cache really that painful?

 Gtk-update-icon-cache discards and rebuilds the whole cache, so presumably it 
can be rather costly. There should be no problems with icons in our case 
though, as far as packagers are concerned - just doing what's already 
required, i.e. touching the toplevel dir, should be enough.

-- 
Lubos Lunak
KDE developer
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