[SDL] Accelerated 2D APIs

[Mattias Engdegård]

>What kinds of things _could_ be incorporated into SDL in a platform-indep.
>way, and more importantly, which of these _should_ be?  For example, I'm
>thinking I would really like to have a function to draw a line using only
>integer math

SDL is mainly a lib to give you access to the hardware and get out of
the way; if you want drawing primitives that aren't hardware-accelerated,
put them in a separate library. Straight solid lines *might* go into SDL,
if it can be shown that it's worth the trouble