A while ago Søren Sandmann did some work to support animated
backgrounds. The use case this feature was designed for is to
show pictures of the same scene (e.g. a city skyline) over the
course of the day (say, every 15 minutes), synchronized to the
current time.
Unfortunately, we didn't ever get around to take such a photo
series. But it would be a shame to let this nice feature go
unused and eventually bitrot away, so I ported it to the new
appearance capplet last night, and I am sending out this email
in the hope that maybe some artists will find this interesting
enough to come up with some cool animated backgrounds.
Here is how it works:
Instead of a jpeg or png, you create an xml file like the
following:
<background>
<starttime>1184295694</starttime>
<static>
<duration>60.0</duration>
<file>/path/to/image1</file>
</static>
<transition>
<duration>30.0</duration>
<from>/path/to/image1</from>
<to>/path/to/image2</to>
</transition>
<static>
<duration>60.0</duration>
<file>/path/to/image2</file>
</static>
</background>
starttime is the time in seconds since the unix epoch,
duration is in seconds.
Matthias
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