Been searching how to rotate an image in sdl

[Mythios]

Well basically I can't find anything on how to rotate an image in SDL. So just if anyone knows of anyway possible to rotate one. If it be sending me a tutorial or if you know how.

But I want it to have no external files i need to include. Like a function someone has already made a small framework for etc.

Cheers,
Myth.

[Scipio]

Quick search in google brought me to this topic:
http://forums.indiegamer.com/archive/index.php/t-3836.html

I'm learning SDL myself, so I don't know to much about it. But when you can isolate every single pixel in a surface, it would be quit easy to calculate it's new position by writing you're own function.

[Mythios]

Thanks for that Scipio - But not exactly what I'm looking for as they are talking about using something from SDL_gfx and well. If you look at his code for his rotation its very complex / resource consuming for something so basic. I have a wrapper function in OpenGL somewhere back on another PC of mine. So I think I'll have to go dig that up and use it. I'll post the code for it if you'd like a copy of it.

I know it works perfect as I've used it before but yeah - Have to use some openGL for it.

Thanks though!

[helios]

Unless you don't mind nearest neighbor, arbitrary rotation is a pretty expensive operation, particularly from software.

[tition]

What does "mind nearest neighbor" mean?

[helios]

Nearest neighbor is the cheapest interpolation algorithm, but it's results are usually unacceptable. If you don't mind using it, arbitrary rotation can be cheap. Otherwise...

http://en.wikipedia.org/wiki/Nearest-neighbor_interpolation