Nicholas, since I got stuck on the renderer (I asked Mental's advice on a patch I wrote for rendering SVG elements on feImage) now I started working on the settings UI. I have finally understood how it works. So, contact me as soon as you read this message so that we avoid duplicating efforts. Right now I am implementing the feImage settings UI.
Juca
feImage renderer is working properly for images. Getting graphics from other svg elements is still not implemented
Nicholas, could you work on the UI for this filter primitive, please?
If you wish to do so, I suppose that it could be easier to construct it completely and just leave the svg element settings hidden, so that, as soon as we have the renderer working for svg elements too we can simply .show() this half of the feImage settings UI
The reason why the renderer still does not work for svg elements is because I don't know how to get the NRPixBlock from an element given its id attribute. Maybe somebody here could help me on this?
Juca