bug#51296: [PATCH] Add WebP format support

[Lars Ingebrigtsen]

Stefan Kangas <stefan@marxist.se> writes:

> WebP is an image format promoted by Google since 2010 with a promise of
> decreased file sizes.  Adoption in web browsers have been slow, but in
> 2019, Firefox added support for it, and other browsers followed.[1]
> Since then, this image format has become increasingly common on the web,
> and is reported to be used on 2.5 % of all websites.[2]

Yeah, it doesn't seem to be going away, so I think it makes sense to add
support for it in Emacs.  (Haven't tried the patch, though.)

> The attached patch does that, by using libwebp where it is available.[3]

[...]

> [3]  https://developers.google.com/speed/webp/download

libwebp seems to be available in Debian/bookwork, at least:

libwebp6/testing,now 0.6.1-2.1 amd64 [installed,automatic]

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   bloggy blog: http://lars.ingebrigtsen.no