[SDL] Library idea to add effects such as blur to surfaces

[neil at cloudsprinter.com]

Sorry if this is random rambling or something like this already exists, but i'm
always using the gimp, and i keep tinking there is all that gpl'd code for
filters to modify bitmaps that it wouldnt be too much of a task to create a
library that can use some of that code to add effects to sdl surfaces for in
game effects..

blur, outline, negative, erode things like that

i'm sure if done right this could be a useful addon libary for sdl.

any thoughts?