Fix crash when trying to load animated WebP, return dummy matrix

[jaakkor2]

Fix crash reported in #18. Returns a dummy matrix of the size of the webp, fulfilling needs of ASML-Labs/PPTX.jl#78.

Could be improved with a test, loading the first frame instead a place holder, but hopefully fixing the crash is enough for a merge and a release of a new version.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.19%. Comparing base (b8a91f2) to head (ebbcbe1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   32.25%   34.19%   +1.93%     
==========================================
  Files           5        5              
  Lines         341      348       +7     
==========================================
+ Hits          110      119       +9     
+ Misses        231      229       -2     

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[stemann]

Thanks! Yes, we should be able to make a patch release.

I would very much like a test to be added.

[jaakkor2]

Looks like https://developers.google.com/speed/webp/gallery does not contain examples of animated webp. Then maybe one could rely on https://mathiasbynens.be/demo/animated-webp-supported.webp to be available for downloading for tests?

[stemann]

It seems https://developers.google.com/speed/webp/faq has a tiny base64 encoded webp image with animation and https://storage.googleapis.com/downloads.webmproject.org/webp/images/dancing_banana2.lossless.webp

[jaakkor2]

Animated webp file added to tests.

[stemann]

Please rebase on master (updated CI), and fix formatting issues.

[jaakkor2]

All checks have passed. Anything else that is needed here?