[opencv] update to v4.12

[cenit]

Fixes: #46281

• Changes comply with the maintainer guide.
• SHA512s are updated for each updated download.
• The "supports" clause reflects platforms that may be fixed by this new version.
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.

[cenit]

sorry i have been away busy for some time and i cannot understand the new ci testing. Any hint or help on what to do? (feature testing, etc)

[autoantwort]

sorry i have been away busy for some time and i cannot understand the new ci testing. Any hint or help on what to do? (feature testing, etc)

What do you not understand?
The feature test "installs" each feature separately, which should work. It also test the core feature and what happens when you select all features at the same time. You can run the command locally vcpkg x-test-features --failure-logs=logs --ci-feature-baseline=scripts/ci.feature.baseline.txt opencv4, which is an automated way of running vcpkg install opencv4[core], vcpkg install opencv4[core, feature1], vcpkg install opencv4[core, feature2], ... .
In the scripts/ci.feature.baseline.txt you can specify which features are expected to fail (should be none), or which combinations can not be tested together (should be theoretically be none, since they should be additive).

[cenit]

ok this should be enough. I will find time to fix the pr asap, i assume the failures are not related to the update itself but something already in the baseline.

[autoantwort]

You can use the feature baseline from #46476 to get a green ci

[cenit]

You can use the feature baseline from #46476 to get a green ci

thanks, just merged with your PR. Let's wait for the results!

[cgilles]

any progress here to update the OpenCV port to 4.12.0?

[lwqwag]

any update?

[cenit]

no sorry i am very busy lately, unable to carry on the work.

[mkreddy477]

Is it possible to prioritize this or give some tentative date by when we can expect this to be available?
I am requesting this information as there is a CVE in the earlier versions of OpenCV: https://nvd.nist.gov/vuln/detail/CVE-2025-53644

[patrikhuber]

I would also like to upgrade to OpenCV 4.12, because it's the first version that supports a custom log function callback.

This PR is not trivial.... I've also opened an issue in the OpenCV repo to hopefully get some attention from the OpenCV maintainers, and make their build more compatible with vcpkg out of the box - it might help if more people post/upvote it: opencv/opencv#28042

[BillyONeal]

Closing this in favor of @dg0yt 's PR. Thanks for the update and sorry it didn't work out!