Hi, a quick followup to myself... I couldn't resist and spent some time on the threaded pixel-processor code . The first part of the TODO I posted yesterday is done, the code has been ported to gthread. This makes the thread functionality available on all platforms supported by gthread-2.0. I have also cleaned up the code further while porting it to gthread. It seems to be working rather well now, but I haven't done any benchmarking so far. There's now a #define to control the ratio between created threads and tiles that are to be processed. This parameter definitely needs tuning. Also tried to port the code to GThreadPool but it turned out to be not as trivial as I expected. The current code blocks until all threads are returned and it is not trivial to implement this behaviour with GThreadPool. So this part, the more interesting part of the TODO, is still open. I don't want to put more time into this, but I think it would definitely make sense to introduce a thread pool to cut down the number of thread creations. Any volunteers? Sven
