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Backing Store Question [message #45465]

Fri, 16 September 2005 06:35

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Folks,

In poking around in the IDL documentation this morning, I came
upon this in the WIDGET_DRAW documentation:

On some systems, when backing store is provided by the
window system (RETAIN=1), reading data from a window
using TVRD( ) may cause unexpected results. For example,
data may be improperly read from the window even when
the image displayed on screen is correct. Having IDL
provide the backing store (RETAIN=2) ensures that the
window contents will be read properly.

Anybody have any idea which systems this is taking about?

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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		Backing Store Question By: David Fanning on Fri, 16 September 2005 06:35
		Re: Backing Store Question By: David Fanning on Fri, 16 September 2005 13:09
		Re: Backing Store Question By: Karl Schultz on Fri, 16 September 2005 12:25

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