For documentation, what areas of filtering code have the biggest need
for more documentation?
I need to know how to handle input buffers that donīt have the same size as the output buffer. I also need to know how to work with different coordinate systems.
Perhaps some kind of overview of filtering
framework or maybe in-depth documentation of some smaller part?
Iīd prefer an overview of the current framework and maybe some references for related stuff to read about the subject.
And for rotation not working, what are you referring to, exactly?
Try rotating the elements which test the convolve matrix filter on the svg test suite.