[SDL] dumb question

[Samuel J. Thurston, III]

if i am understanding this (and the other relevant
post) correctly, it is like a "partial screen" version
of SDL_Flip(); is this right? wouldn't this cause
visible 'draw-in' as if drawing single buffered?
sorry this is just one of those concepts i am having
trouble with. 

--- Robert Harrison <rharrison at hgfip.com> wrote:
> UdateRects forces the display to be refreshed with
> the surface changes.
> 
> There is no point doing this automatically every
> time you make a surface 
> change as you may want to make hundreds of small
> changes to a surface 
> before refreshing the display screen.
> 
> I don't think you need to call UpdateRects if you
> don't want to refresh 
> the display.
> 
> >maybe I'm just dumb, but i cannot understand what
> the
> >SDL_UpdateRects(); function is for.  The only
> example
> >code i can find using it has an SDL_UpdateRects()
> >occurring right after, and upon the same rect as a
> >blit. does the blit copy the image to framebuffer
> or
> >no? is the framebuffer different than the
> >corresponding physical video ram... what exactly is
> it
> >updating, to where and from where?
> >
> >what else would i use this function for?
> >
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> 
> 
> 
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