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Re: fast image display [message #30726]

Wed, 15 May 2002 16:48

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Dan Larson (drl16@cornell.edu) writes:

> I'm not using a 486 :). However, I have tried the approach that
> several people suggested, Xinteranimate. This routine works fine
> for about 100 image frames. Larger number of frames leads to the
> following error message:
>
> "%window: unable to open pixmap" OR
> "unable to allocate memory for backing store. Window closing."
>
> This is a problem I have encountered before with Xinteranimate.
> Changing the backing store (RETAIN) doesn't really alleviate
> the problem. In addition, I don't know how to add color with
> Xinteranimate.
>
> It could be I'm asking for too much to use pixmaps on such
> large arrays...

Allocating pixmap memory is always an interesting
proposition. Pixmap memory is allocated against
the video driver. It is up to the video driver what
is done when more memory is asked for than it has
available. Many drivers can use system memory to
store extra pixmaps. Others can page virtual
memory. With these drivers you can create absolutely
huge pixmap files. Some drivers are extremely limited.
For example, Windows NT drivers cannot page virtual
memory, so you are strictly limited to system
memory.

In any case, it is probably more a hardware problem
than it is an IDL problem.

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: fast image display By: David Fanning on Wed, 15 May 2002 16:48
		Re: fast image display By: Dan Larson on Wed, 15 May 2002 16:45
		Re: fast image display By: Dan Larson on Wed, 15 May 2002 16:33
		Re: fast image display By: Rick Towler on Wed, 15 May 2002 14:35
		Re: fast image display By: David Fanning on Wed, 15 May 2002 14:29
		Re: fast image display By: David Fanning on Wed, 15 May 2002 13:33
		Re: fast image display By: David Fanning on Wed, 15 May 2002 13:30
		Re: fast image display By: Mark Hadfield on Wed, 15 May 2002 13:17
		Re: fast image display By: Rick Towler on Wed, 15 May 2002 10:26
		Re: fast image display By: R.Bauer on Wed, 15 May 2002 09:43
		Re: fast image display By: Mark Hadfield on Wed, 15 May 2002 17:27

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