Filters are one of the most attractive aspects of SVG images, as they bring vector graphics to a new level, allowing introduction of shadows and blurred objects for example. This project was chosen from the list of ideas proposed by the Inkscape team for Google Summer of Code projects.

As suggested by Inkscape team, this project is divided in two components:

   1. adding a SPObject for filters and CSS support for referencing them;
   2. adding renderer support for showing the actual filter effects when rendering.

My Summer of Code project consists on programming the first component, at least for the gaussian blur filter.
It's probable that this first filter gets implemented before the end of Summer of Code. In that case, implementation of the other filters should take place, one at a time, in order of importance (according to user preferences). Once the first filter is implemented, other filters' implementation should be pretty straightforward and faster.