Re: Getting APNG support into libpng

On Wed, 5 May 2021, Chris Lilley wrote:

> However, APNG is now very widely supported so this is a bad situation.
> https://caniuse.com/apng

The level of support in browsers is interesting.  I did not know that.

> Beyond just maintenance though, there is a clear need to re-align the PNG 
> specification with widely-implemented reality, especially as regards APNG.
>
> An updated PNG Specification which incorporates APNG would then allow libpng 
> to incorporate support directly, rather than a plethora of ad-hoc patches, 
> forks, or other means to support it.

I have not read the patch.  What is the nature of the patch?  Is it 
offered under a license compatible with the libpng license?

Why would incorporating APNG support (whatever that may mean) in 
libpng cause a problem?

Libpng itself is not a specification, but it does have ABI and API 
commitments for existing usages.

Usually there is a lot of work done in apps supporting PNG to make 
reading and writing PNG a reality.  I expect the same would be 
required for APNG.

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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