[SDL] How can I implement fade-in/fade-out

[cocobear]

于 Sun, 09 Dec 2007 07:47:34 -0500
"Ryan C. Gordon" <icculus at icculus.org> 写道:

> 
> > SDL_SetAlpha(surface,SDL_RLEACCEL,(Uint8)i);
> > This code does'nt work!
> 
> Try this:
> 
>    SDL_SetAlpha(surface,SDL_RLEACCEL | SDL_SRCALPHA,(Uint8)i);
> 
> Without SDL_SRCALPHA, blitting will ignore the alpha value you
> specified and just copy the pixels instead of blending them.
> 
> --ryan.
> 

Thanks, I should remember this.

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