The new Java viewer can use libjpeg-turbo through JNI to speed up JPEG 
decoding by a factor of 2-4x, so that library is not strictly required, 
but it is required in order to achieve full performance.  The JNI 
library is packaged with the Mac application bundle, since the Java 
viewer is being used as a self-contained app on that platform.  There 
are two copies of libturbojpeg because older Mac Java implementations 
(for instance, on Tiger) used .dylib as the default suffix for JNI 
libraries, but newer ones expect the library to have a suffix of 
.jnilib.  On non-Mac platforms, you would need to download and install 
the 1.3 pre-release libjpeg-turbo SDK for now 
(http://www.libjpeg-turbo.org/DeveloperInfo/PreReleases) in order to 
take advantage of accelerated JPEG decoding.

On 12/17/12 6:14 AM, James Wettenhall wrote:
> Hi,
>
> I notice that the Mac OS X application bundle of the TurboVNC Java Viewer 
> contains libturbojpeg.dylib and a duplicate of the same file called 
> libturbojpeg.jnilib
>
> But I can't find an equivalent of this shared library in the TurboVNC 
> distributions on other platforms I have looked at - Windows and Linux (RPM).
>
> Is this shared library required by the TurboVNC Java Viewer?
>
> Or is it a relic left over from an earlier implementation of the Java viewer?
>
> Thanks,
> James

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