Comment 2 for bug 522384

I'm do not know much about gtk, but I've been looking through the code and have an idea:
you have a get_pixbuf() method that loads the file and returns a pointer with ref. counter at 1, after that you are scaling it and creating m_pixbufFull and m_pixbuf ( rescaling twice in a row not very good :P )
but after that what happens with the first pixbuf? you call
g_object_unref (m_pixbuf);
g_object_unref (m_pixbufFull);
but nothing for the first one, I pushed a small fix, after 20 switched on 2 small images, used memory dropped from 6.5% to 4%, so there is something else, I'll keep looking

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now, as I understand, iText does not have any destroy method and end() does nothing
iPdf and iDocument destroy methods do nothing
will look other plugins later