Re: [png-mng-implement] png_set_strip_16 unavailable in libpng10 >= 1.0.51

[Glenn Randers-P. <gl...@gm...>]

Please try libpng-1.0.53beta01 from
ftp://ftp.simplesystems.org/pub/png-group/src
or from http://libpng.sf.net (in the 03-libpng-legacy branch)

Glenn

On Thu, Jan 14, 2010 at 10:06 AM, Paul Howarth <pa...@ci...> wrote:

> On 14/01/10 14:41, Glenn Randers-Pehrson wrote:
> > I'll look into it.  I don't recall that change being intentional.
> >
> > However, libpng-1.0.x are not meant for use in building anything.
> > They are only supposed to provide a shared library to satisfy old apps
> > that were linked against libpng-1.0.x years ago.
>
> I understand that, but periodically it's necessary to rebuild legacy
> apps to fix security issues etc. and those builds will change as little
> as possible to avoid unintended regressions, hence not updating to
> current libpng versions.
>
> In order to ensure that such rebuilds are as painless as possible,
> Fedora rebuilds everything in the distribution from source from time to
> time to ensure that everything is still buildable, and it was one of
> those test builds that uncovered this issue.
>
>
Thanks for the report.  Tests are a good thing.

I don't remember why the #ifdef's were introduced.  It must have
been a cut-and-paste error on my part.

The CHANGES file for 1.0.53/1.2.43 will say:
  Removed "#ifdef PNG_1_0_X / #endif" surrounding
    PNG_READ_16_TO_8_SUPPORTED and PNG_READ_GRAY_TO_RGB_SUPPORTED
    in pngconf.h.  These were added in libpng-1.2.41beta08 and
libpng-1.0.51,
    introducing a binary incompatibility with libpng-1.0.50.

Glenn