[cairo] Not using libpng on OSX

[Behdad Esfahbod]

Hi,

Nice work.

It depends on the Quartz surface it seems.  Is that correct?  That changes how
configuration should be done.

In general, right now we don't have much way to deal with conditional file
inclusions other than C preprocessor conditionals.  The constraint comes from
wanting to keep the configuration central and shared, and the fact that
conditional syntax is different between autotools and win32.  I may hack
something today.  Even more build system hacking.  I love that!

behdad

Travis Griggs wrote:
> Attached is a patch, which makes an OS X build not need libpng, but
> instead use the CoreFoundation services provided by OSX. It's a new
> file, and a change to the Makefile.sources (ideally, this second should
> be made conditional). I also go in to my Makefile after configure'ing,
> and whitewash any libpng references and cairo-png.c references, so I'm
> sure it builds/links without them.
> 
> The tests all run and don't completely melt down. I think we always have
> a decent amount of failures on OSX to begin with.
> 
> I guess the next thing I need to do is figure out how to wire it into
> the Makefile.am stuff. Any help/hints/etc appreciated. If I can figure
> that out, I'll try to submit the more complete patch. But I figured I'd
> post this much, in the event, I'm unable to make much traction with this
> other part. Or in the event it's better done by someone else anyway.
> 
> BTW, thanks much to numerous IRCers for all the help with this.
> 
> -- 
> Travis Griggs
> Objologist
> For every adage, there is an equal and contrary un-adage
> 
> 
> 
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