Animated PNG (APNG) support

[Jochen Hinrichsen]

Fellow Gophers,

the package image/png references the w3c spec for PNG. This spec has been updated this summer to include support for animated PNG. While animated GIF is already implemented in the stdlib, animated PNG is not. The feature itself can probably be implemented within Go compatibility guarantee.

What would be the proper way to get this going? A feature request? Will it be included automatically w/ next release? Should i open a github issue? 

WDYT?

https://pkg.go.dev/image/png

https://www.w3.org/TR/png/

https://github.com/golang/go/issues

[Sean Liao]

You can open an issue, but what really needs to happen is someone needs to implement the actual support for it, and demonstrate the viability with a third party package. 

Considering the image/ packages are only lightly maintained at the moment due to lack of reviewers, getting anything in to the standard library may take quite a while.

- sean

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