Question: I need to calculate where to crop a camera preview in real-time on Android.

What Stack Exchange site is right for that question?

EDIT: It doesn't specifically have to be Android. I'm more interested in how to calculate the crop location on an image (quickly).

Answer: 
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> Can one moderator just make a unilateral decision and action a migration? Or were there multiple votes involved?
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Regular close voters can vote to close a question, or choose from a limited set of sites to migrate it to. Code Review is not an available migration path on Stack Overflow, however, so only a moderator may migrate a question to that site. A moderator's close/migrate vote is always binding (i.e. it overrides all others).

You can find out who performed the migration by scrolling to the bottom of your question where it was moved to, and clicking the origin site name:

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> **migrated** from [stackoverflow.com](https://stackoverflow.com/questions/14532169/naive-c-matrix-multiplication-100-times-slower-than-blas?noredirect=1)
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Which brings you to the [original page](https://stackoverflow.com/questions/14532169/naive-c-matrix-multiplication-100-times-slower-than-blas?noredirect=1), where you can see at the bottom who migrated it:

> 
> **migrated** to [codereview.stackexchange.com](https://codereview.stackexchange.com/questions/20980/naive-c-matrix-multiplication-100-times-slower-than-blas) by Luchian Grigore, casperOne♦
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That said, a migration can be [rejected](https://meta.stackexchange.com/questions/35744/allow-diamond-moderators-to-reverse-question-migrations/126982#126982); this involves closing the question on the destination site, which unlocks it on the originating site allowing it to be reopened if appropriate. However this depends on what happens to the question on the destination site.
If you view the [mirgation stub](https://stackoverflow.com/questions/14532169/naive-c-matrix-multiplication-100-times-slower-than-blas?noredirect=1) on Stack Overflow, you can see who closed it as off-topic.

Posts can be closed/migrated either by 5 users with enough reputation to close a quesiton (3k), by a single moderator, or by some combination (once a moderator votes to close, the question gets closed, whether there are no close votes already or 4).

In the case of your quesiton, the close notice reads:

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> migrated to codereview.stackexchange.com by Luchian Grigore, casperOne♦ 1 hour ago
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