[SDL] SDL memory consuming

[Gabriel Gambetta]

> This has bitten me before, also. What reason is there for 
> SDL_DisplayFormatAlpha() not to free() the surface it is passed? I 
> can't think of a case where someone would convert a surface to match 
> the screen format, then use both the old and the new surface

I can't, either, but a general purpose library should be, well, general
purpose.

Right now, you can free() the old surface if you want. Maybe someone can
find a use for it.

OTOH, if SDL_DisplayFormatAlpha() did it automatically, the case we
can't 
think of would be impossible to do.

Sam should answer this question, but I guess the reason is something
like this. 
This is how I would design an API, anyway.

Lic. Gabriel Gambetta
ARTech - GeneXus Development Team
ggambett at artech.com.uy