how to avoid memory leaking

[maarten van damme]

I'm trying to generate images and after displaying them I want to save them
to a png file. I use parallelism to generate them asynchronously with the
gui-thread to avoid blocking (don't know if this is really relevant).

If I add a single line in the method where I generate the image that
creates a class which allocates a pretty big array, slowly but surely the
memory starts to rise until it ends in a spectacular out of memory
exception. I always thought the garbage collector would deal with it.

I tried reducing it but failed. Maybe I should let dustmite bite in it a
bit later.
How can I manually fix this? Is this a known bug in the garbage collector?

btw, this code also caused segfaults on my  64 bit laptop on linux.
How can I avoid this?

main class:
https://dl.dropboxusercontent.com/u/15024434/picturegenerator/generalised.d

zip file with everything ready to go to compile:
https://dl.dropboxusercontent.com/u/15024434/picturegenerator/picturegenerator.zip
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