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<== Date ==> <== Thread ==>
Subject: RE: EPICS areaDetector plugin & phoebus
From: Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>
To: "Kasemir, Kay" <kasemirk at ornl.gov>
Cc: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Mon, 11 Apr 2022 16:12:54 +0000

Ø  As far as I know, implementations of compression/decompression like the one for ImageJ call out to native libraries

 

That is true.  But the decompression libraries are all built in ADSupport in a way that makes them easy to call from other applications and languages, including Java.  They are called from ImageJ, and also from the HDF5 library via its run-time plugin mechanism.  This means that HDF5 applications do not need to be linked with the decompressors, they can find and load them at run-time.

 

Because they are built from source in ADSupport, there are minimal dependencies on OS packages.

 

Mark

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Kasemir, Kay via Tech-talk
Sent: Monday, April 11, 2022 10:30 AM
To: 'tech-talk at aps.anl.gov' <tech-talk at aps.anl.gov>
Subject: Re: EPICS areaDetector plugin & phoebus

 

> I’ve forgotten if CSS/Phoebus supports compressed PVA NTNDArray objects, but that would help a lot when visualizing large arrays.

 

It doesn't. As far as I know, implementations of compression/decompression like the one for ImageJ call out to native libraries, see decompress*.. code in https://github.com/areaDetector/ADViewers/tree/78cb7127d655685d9f4f2c83f0d83c7e5b758d58/ImageJ/EPICS_areaDetector. If we supported that in Phoebus, we could no longer offer a generic Windows/Linux/Mac version, everybody would have to locally compile the compression code.

 

 

References:
EPICS areaDetector plugin & phoebus Jörn Dreyer via Tech-talk
Re: EPICS areaDetector plugin & phoebus Mark Rivers via Tech-talk
RE: EPICS areaDetector plugin & phoebus Pearson, Matthew via Tech-talk
Re: EPICS areaDetector plugin & phoebus Kasemir, Kay via Tech-talk
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