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: 
It says:

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> migrated from [stackoverflow.com](https://stackoverflow.com/questions/14532169/naive-c-matrix-multiplication-100-times-slower-than-blas?noredirect=1) 1 hour ago
> 
> 
> 

below the question on the target site. Clicking on the link takes you back to the original question, where it says:

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

Of these "Luchian Grigore" voted to close(he can't vote for migration to code-review since it's not in the list), and "casperOne" as a diamond mod migrated it.
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
> 
> 
>