Experimental Physics and
Industrial Control System

Mark Rivers via Tech-talk <[email protected]> · Tue, 4 Dec 2018 03:06:30 +0000

ADViewers R1-3 is now available.  This is from the release notes:

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### EPICS_NTNDA_Viewer
* Added support for reading compressed NTNDArrays.  Blosc and JPEG compression are both supported.
  This can substantially reduce network traffic when the IOC and the viewer are running on
  different machines.
  * The decompression is done using the C libraries because I could not find any native Java code for blosc decompression,
    and the native Java code for jpeg decompression is significantly more complicated (and probably slower)
    than just using the C library.
    The required libraries on Linux are decompressJPEG.so, libjpeg.so, libblosc.so, and libzlib.so.
    On Windows the libraries are decompressJPEG.dll, jpeg.dll, blosc.dll, and zlib.dll.
  * ImageJ needs to be able to find these shareable libraries to handle compressed arrays.
    One way to do this is to add areaDetector/ADSupport/lib/linux-x86_64/ to the LD_LIBRARY_PATH environment
    variable on Linux, and areaDetector/ADSupport/lib/windows-x86 to the PATH environment variable on Windows.
    This assumes that ADSupport was built using WITH_BLOSC=YES, WITH_JPEG=YES, BLOSC_EXTERNAL=NO, and JPEG_EXTERNAL=NO.
   * The ADViewers distribution includes two new jar files, jna-5.1.0.jar and jblosc-1.0.1.dev.jar.
    The jna file provides support for Java Native Access, which is the interface to calling the shareable libraries.
    The jblosc file provides a Java wrapper around the blosc shareable library. These files need to be copied to
    ImageJ/plugins/EPICS_areaDetector along with the other files in the ADViewers/ImageJ/EPICS_areaDetector directory.
  * The ADViewers distribution also includes two new .java files,  decompressJPEGDll.java and myUtil.java.
    These files need to be compiled once in ImageJ using the `Plugins/Compile and Run ...` menu.  The files
    are actually just compiled and not run, since they are just support files, not plugins.
    decompressJPEGDll.java is a wrapper around the C JPEG library.
    myUtil.java is a modified version of Util.java that is included in the JBlosc package.  The version in that
    package lacked support for short (16-bit integer) arrays, and lacked the ability to specify the byte order
    for JNA buffers.

* Changes to the user interface.
  * Removed the Connect/Disconnect button.  Typing Enter in the Channel Name field will do a connect.
  * Typing a new Channel Name followed by Enter will disconnect the existing channel and connect the new one.
  * The Start/Stop button has been replaced by separate Start and Stop buttons.
    This makes it easier to tell the current state at a glance.

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The home page is here:

https://github.com/areaDetector/ADViewers

The documentation is here:

http://cars.uchicago.edu/software/epics/areaDetectorViewers.html

The release notes are here:

https://github.com/areaDetector/ADViewers/blob/master/RELEASE.md

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System