| Re: Backing store issue [message #48139 is a reply to message #47993] |
Mon, 27 March 2006 12:24   |
Jonathan Joseph
Messages: 69
Registered: September 1998
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Member |
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David,
I was afraid you were going to write something like that and expose me
for the hack-programmer that I am.
I suppose I could (and will have to) do as you say, but I still believe
that I shouldn't have to write this code when RSI claims to have written
it for me. I think IDL should be querying the video card and if it
doesn't have enough memory for the request, then IDL should either use
some other method or at least give me an error message - not just give
me garbage in the window.
If I program it myself, maybe I won't get it right. Maybe the
programmers are RSI didn't get it right, which is why works only when I
scroll a few lines a time (and only in the vertical direction), and not
when I scroll faster.
-J
David Fanning wrote:
>
> When scrolling, usually only a *few* rows or columns need
> to be drawn. Most of what you need is already on the display,
> it just has to be moved with DEVICE COPY. Surely, *this*
> is fast enough! :-)
>
> Cheers,
>
> David
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