[JDEV] Buddy Icon (Avatar) Proposal

[Dirk-Willem van Gulik]

Have a look at 'batik' at the ASF (www.apache.org) - it gives you nice
scalable graphics in xml :-) and the lib's to render it.

Dw

On Thu, 30 Aug 2001, Jens Alfke wrote:

>
> On Thursday, August 30, 2001, at 03:52 PM, Julian Missig wrote:
>
> > First, the requirements on the image.  The image should be a 50 x 50
> > image in either GIF, PNG, or MNG format, as well as under 8k of data.
> > MNG support is optional.
>
> (1) 50x50 seems an unusual choice. Mac and Windows use 32x32 heavily
> (what do kde / GNOME use?), NeXT used 48x48, and Mac OS X also supports
> 64x64 and 128x128. (Apple's OS X Mail client displays a 64x64 icon of
> the sender of an email message, and my Jabber client uses 32x32.) It
> would be better to have a size that was a power of two so that it would
> scale more smoothly to 32x32. OS X has built in bicubic scaling so it
> won't look too bad, but without this the icon will look really jaggy at
> 32x32 or 64x64.
> (2) Why disallow JPEG? It has by far the best compression. (A 64x64 face
> image usually compresses to under 2k.) It's only drawback is the lack of
> alpha channel.
> (3) What is MNG? I've never heard of this before.
>
> > The actual icon request is in a new IQ namespace:
>
> Why not use the server-side generic storage facility instead? The get
> sequence would be just as you described, except the namespace would be
> something that didn't start with "jabber". The owner of the image would
> use a "set" on his/her JID with the same namespace. This way the server
> would automatically store the image.
>
> This would reduce network traffic for the owner of the icon (imagine the
> poor guy on a 28.8 modem with 100 buddies who all request his new icon
> at once) and allows an offline user's icon to be retrieved.
>
> >         <data type='gif|png|mng'>
> >           Base64 Encoded Data Here
> >         </data>
>
> It's not really necessary to declare the type of the data, as the
> standard graphics formats are all self-describing. But if you do provide
> it, please use a real MIME type instead of making up a name.
>
> --Jens
>
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