WebP encoder optimization

[磯崎希（nontan）]

Hi, everyone.

Recently I'm working on optimizing WebP encoder and I've made it 4% faster than the current implementation with a small improvement. In brief, ITransform_SSE2() could be more efficient in case that do_two is 0.

If you are interested in this, I'll post the detail and my patch. (Do I need to execute the CLA before posting?)

I would be glad if I could contribute to the upstream!

[Yannis Guyon]

Hello! Thanks for your interest in contributing. Please see some guidelines here: https://chromium.googlesource.com/webm/libwebp/+/HEAD/CONTRIBUTING.md

To answer your question: you need to submit a CLA before submitting a patch.

Instructions for sending a commit:

git clone https://chromium.googlesource.com/webm/libwebp

cd libwebp
Copy the commit-msg script into ./git/hooks (this will add an ID to all of your commits):

curl -Lo .git/hooks/commit-msg https://chromium-review.googlesource.com/tools/hooks/commit-msg && chmod u+x .git/hooks/commit-msg

Modify the code here.

git commit -a -m "My great commit name"

git push https://chromium-review.googlesource.com/webm/libwebp HEAD:refs/for/main

Go to https://chromium-review.googlesource.com to view your patch and request a review from the maintainers.

[磯崎希（nontan）]

I understand.
In my company, I'm requesting for approval of signing the CLA and it will take some time before completion.

Thank you for your patience.