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The latest version of 'default.preloop' can be downloaded from default.preloop.
Pre-loop code is the code that gets executed once when an RFX filter is applied to a range of frames. In the case of RFX-GIMP filters, the pre-loop code typically performs the following steps:
- Check if GIMP's Script-fu server is running and connect to it. If this connection fails then a new instance of GIMP (running Script-fu server) is started in the background.
- Define a Perl subroutine, 'rfx_sendmsg', that sends messages to the Script-fu server and waits for the response.
- Sends a message to the server that defines a Script-fu procedure. This procedure is to be used by loop code when saving an individual frame.
This basic functionality is provided by the default.preloop file, and including this default pre-loop code should be sufficient for most all RFX-GIMP filters. However, there is no reason a RFX-GIMP filter can't provide its own custom version of the pre-loop code if the filter needs to do so.