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Re: pixmap problem [message #36225 is a reply to message #6988]

Thu, 28 August 2003 10:13

Karl Schultz
Messages: 341
Registered: October 1999

Senior Member

"Steve Ready" <ready@parc.com> wrote in message
news:bij1ge$t6r$1@news.parc.xerox.com...
> Folks,
>
> I am hoping someone can shed some light on this problem.
>
> I am creating a large image in graphics memory with WINDOW,/PIXMAP and
> drawing to it using the PLOTS routine. I have discovered that if I specify
a
> pixmap size larger than a particular value, dependent on the graphics
card,
> I am able to allocate the graphics memory with no problem but am not able
to
> draw to it. I have verified this on an WinXP and Win2K machine, both with
> 32mb graphics cards. Sample demo test code follows with typical output.
This
> is slightly modified code from RSI website for testing available graphics
> memory size. Any clues?
>
> Thanks, Steve

This is a known problem, # 22066 should you call IDL tech support about it.

There is no clear resolution to the problem, but it does appear to be pretty
sensitive to the graphics card and/or driver software. On many machines,
the attempt to create a "too large" pixmap will fail and any pixmap that is
created successfully returns the correct data on a TVRD; this is the correct
behavior. However, several users have reported the same symptoms as you are
describing. If you can report what graphics hardware and driver software
(including version information) you are using, perhaps we can identifiy a
pattern. (And I suppose the canned response of "check your drivers for an
update" is a good thing to offer here as well.)

Another strange behavior on the failing hardware is that the ORDER keyword
can affect the pixmap size threshhold where the data is not read back
correctly via TVRD. IDL itself does not perform the "flip" as controlled by
ORDER. IDL instead modifies parameters to a WIN32 GDI call, thus making the
GDI or graphics driver perform the flip. A change in behavior like this is
somewhat suggestive of a driver problem.

Karl

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[Message index]

		Pixmap Problems By: Kenneth Kump on Thu, 05 September 1996 00:00
		Re: Pixmap Problems By: steinhh on Mon, 30 September 1996 00:00
		Re: pixmap problem By: Steve Ready on Thu, 28 August 2003 11:47
		Re: pixmap problem By: Karl Schultz on Thu, 28 August 2003 13:35
		Re: pixmap problem By: Karl Schultz on Thu, 28 August 2003 10:13
		Re: pixmap problem By: R.Bauer on Thu, 28 August 2003 09:53
		Re: pixmap problem By: Steve Ready on Thu, 28 August 2003 09:36
		Re: pixmap problem By: R.Bauer on Thu, 28 August 2003 00:15

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