Re: [E-devel] intro

[<Val...@vt...>]

On Fri, 20 Jul 2001 16:57:16 +1000, Carsten Haitzler said:
> yes. its called a blitter - every card has had one for at least 5-10 years
> now... :)

Yes, but I've had the pleasure of working with too many brain-damaged
graphics cards that had kick-ass blitters that worked great except for
the case that you needed. In this particular case, for scrolling a
window that's X high and Y wide by N pixels, if you're using a
blitter, it has to be able to blit from a canvas the rectangle
(N,0,X+N-1,Y-1) to the rectangle (0,0,X-1,Y-1) - remenber that in X, there
isn't any really good server-side concept of a canvas (which is why
things like Eterm can't just create a canvas (winsize+scrollback) high
and scribble on it and change a viewport).

/Valdis