[SDL] Fast Way To Check If Certain Pixel is Inside Certain Surface

[Phantom Lord]

Thx guys.

2006/7/4, Vassilis Virvilis <vasvir at iit.demokritos.gr>:
>
> Phantom Lord wrote:
> > Hi, i'm working on a particle engine (pixel-based, for now) and i'd
> > implement the following code for checking if the pixel is inside that
> > Certain Surface:
> >
> > for(int i=surface->clip_rect.x; i<surface->clip_rect.w; i++)
> >   for(int j=surface->clip_rect.y; j<surface->clip_rect.h; j++)
> >      if(particle.x == i && particle.y == j) do something.
> >
>
> if ((particle.x >= surface->clip_rect.x) &&
>     (particle.x < surface->clip_rect.x + surface->clip_rect.w) &&
>     (particle.y >= surface->clip_rect.y) &&
>     (particle.y < surface->clip_rect.y + surface->clip_rect.h)) {
>     do_something();
> }
>
>      .bill
>
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-- 
Phantom Lord
Caelis Studios ---> From Gods Hands To Yours
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