| IDL/MSWin pixmap limitations, Part 2 [message #33061] |
Mon, 25 November 2002 07:42 |
Craig Hamilton
Messages: 28
Registered: December 1996
|
Junior Member |
|
|
In August I asked about a solution to the problem of "unable to create
pixmap"
when running IDL on MSWin 2000. The Most Noble David Fanning explained
that pixmaps are created in video RAM, and, unless your video card is
"smart", I
am limited by the video card. He also suggested a workaround using unmapped
draw
widgets instead of pixmaps.
I have questions about these two potential solutions:
1. Get a smarter video card (with loads of video RAM, I presume). Can
anyone
suggest a video card that can use system RAM when necessary? I have
tried
a GEForce4 4200 AGP card with 128 MB of RAM with no success trying
to allocate about 1500 pixmaps of total size of around 90 MB.
Interestingly,
a Radeon VE with 32MB of video RAM works with roughly the same limits
as the GEForce4 card. So, it doesn't seem to be as simple as just
throwing
more video RAM at the problem.
2. Use unmapped draw widgets instead of pixmaps. I started working on this
and ran into the problem (at least according to the documentation)
that
mapping/unmapping applies only to base widgets, not draw widgets.
So, if
I unmapped a draw widget, it goes up to its parent base and unmaps
it,
which is not what I want.
Any tips much appreciated.
Thanks,
Craig Hamilton
Wake Forest Univ. Sch. of Medicine
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
