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

[Alexander Zvegintsev]

+1

Thanks,
Alexander.

On 23/01/2017 18:35, Sergey Bylokhov wrote:
> 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.