Media: fix and improve WebP features detection

[azaozz]

Follow up from #53653.

Looking at ​https://developers.google.com/speed/webp/docs/riff_container, the "extended" WebP file format VP8X may include a lossy or lossless "bitstream" chunk (VP8 or VP8L) and few optional chunks: ALPH, EXIF, ICCP, ANIM, etc.

Ideally the wp_get_webp_info() function should be extended to detect these features.

[desrosj]

Moving to 5.8.1 to see if there's any improvement that can be made in the next minor release.

[pbearne]

Can anybody provide a set of images that we can use to test this with?
or point to where I can get/create them

[desrosj]

With 5.8.1 RC in less than 24 hours and no patch, I'm going to punt to 5.8.2.

[sourovroy]

Replying to pbearne:

Can anybody provide a set of images that we can use to test this with?
or point to where I can get/create them

I have collected a few images you may analyze with these ​https://drive.google.com/drive/folders/1humlxtfXOzaBGJ66Y6Iz8nsSObj4DZ1c?usp=sharing

[pbearne]

Thankyou @sourovroy

A couple of questions
Are these royalty free images?

and what is the extra info that each image has?

We are looking for images with extra chunks of image data

Paul

[desrosj]

This one still needs testing and a patch, and 5.8.2 RC is due out tomorrow. Moving to Future Release.

[abitofmind]

I wanted to bring this to your attention:

• Will this feature here ensure all 3 criteria as proposed in #57238 ?
• Feel free to copy/merge the sample files and comments from there to here if appropriate.