<AWT Dev> RFR: 8167228: Update to libpng 1.6.28

Sergey Bylokhov sergey.bylokhov at oracle.com
Mon Jan 23 15:35:44 UTC 2017

Looks fine.

> Webrev: http://cr.openjdk.java.net/~prr/8167228/
> This fix updates libpng in JDK 9 to the current version 1.6.28.
> Aside from updating to these files there are few changes to note
> (1) The CHANGES file has previously inexplicably included a GPL and Oracle Copyright.
> Nothing whatsoever in here is from Oracle and it is not even source code.
> I deleted that notice.
> (2) We have always compiled without "WRITE" support, yet included all the source
> files that are used only for writing. libpng is used only by splashscreen (it is compiled
> into the library) and that has no need for write support anyway.
> So I decided we should stop importing these files to remove any future questions
> about issues in PNG writing ...
> Note that the options to disable WRITE support are configured via pnglibconf.h,
> more on that in a moment.
> (3) In addition pngtest.c is removed. This is wholly unnecessary()
> (4) pnglibconf.h is also updated to no longer automatically decode certain
> compressed chunks which we don't use anyway ... this will improve performance
> and robustness.
> Future updates, and indeed any backports to 8u should follow the above.
> JPRT has built this for all platforms and all SplashScreen tests have passed ..
> although I think only a few really test png support.
> -phil.

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