[Bug 1524328] Re: libpng 1.6 support

[milasudril]

Current version of libpng also has minor bugs on x86_64-linux-gnu (see
my report of this bug):

    image.cpp:172:9: warning: conversion to `uint32_t {aka unsigned
int}` from `png_uint_32 {aka long unsigned int}` may alter its value
[-Wconversion]

As a side note, if I am on i386-linux-gnu, or any MinGW, version 1.2
does not have this defect, but I guess we want it to have correct
typedefs on x86_64-linux-gnu.

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Title:
  libpng 1.6 support

Status in libpng package in Ubuntu:
  Confirmed

Bug description:
  As said, in Debian it is pretty much in place, and I sync'd/merged almost every package in Ubuntu too.
  Would it be possible to have the transition done for Xenial?

  I can fix stuff in Universe, but not in Main (there is not many
  packages there AFAICS)

  this is the debian bug
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650601

  you can start from this message:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650601#691

  thanks!

  Gianfranco
  ----

  Libpng 1.6 has been out for a little while, apparently it has some
  important fixes for pngquant (which is also in Ubuntu).  There are
  comments here that maybe useful:
  https://github.com/pornel/pngquant/blob/master/rwpng.c

  Presumably at some point libpng1.2 will be EOL so we'll need to
  upgrade anyhow!

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