I'm writing a small application for an IR controlled photo show. All
works fine, but the memory usage is increasing with every displayed
photo. When I run a large photo show sooner or later the computer hangs,
because the OS starts to swap the memory.


Sounds strange. Assuming that you use jpegs - you could try to view only png and gif and see what happens. If you application does not leak afterwards, there might be a bug in the jpeg provider.

It seems to me, that the release function doesn't free the allocated
memory correctly. I also took a look at the DFBSee program. I observed
the same behavior. When viewing a lot of pictures, the memory usage is
increasing dramatically.

I am not 100% sure but I think that DFBSee doesnt release the surface to cache 
everything in memory. So this is not a good test.


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