HGE's great for it's simplicity, how they say, make games, not engines! But Allegro seems more powerful and is a lot more realiable, not to mention it's cross-platform, [s]as if anyone cares for cross-platforming[/s]. But yesterday I discovered pmask, a really good collision utility for allegro and SDL! It's detection is perfect and it's unbelievably fast for that kind of precision...
For those interested: PMASK
There're two exe demo showing it's incredibly good performance and detection precision! Give them a try!
Did I say it is "pixel perfect"? D:
@Edit: It turns out that PMASK is only Allegro4... what a disappointment! Anyway, the author's released his work (thanks for it if you're reading this haha) on public domain, anyone can port it!
I guess I'll have to read his code and see how he's done the computing. Maybe I can make a ported version for allegro 5 or maybe I'm laughably wrong thinking it's incompatible...
@Edit2: nightcracker has posted the following files on the comments: