How does font size relate to font height

Hi,Im getting confused about font size.
If I use a font of say font size 12. Does that mean
- its maximum height is 12
- its maximum ascent above the baseline is 12 but it can also go below (descent) below the baseline making total height something else.
- something else.

The short answer is: "No".
The font size is APPROXIMATELY equal to the ascent, or probably more accurately, the ascent is approximately equal to the font size. But if you check font metrics for any given font you will see that they are not exactly equal. Perhaps there is some definition somewhere that specifies a precise relationship, but if so, I don't know what the formula is. Even the font metrics are only something of a general hint: according to the API documentation, some characters can be taller than the ascent or drop lower than the descent. And of course character widths vary widely.
My practice is to get the font metrics object and ask what I've got, rather than relying on anything.

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http://support.apple.com/kb/ht5484
But since it really only applied to Asian fonts, it was not of much interest to other users.
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Geneva L.
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http://www.ni.com/ask

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