[ft] figuring out where the baseline is

[edA-qa mort-ora-y]

I'm rendering text to a bitmap and using the provided metrics I can't
figure out where the baseline is.  That is, it's easy enough to use the
"horiBearingY" and "height" glyph metrics to figure out how to place a
glyph relative to the baseline, but I don't see how I can know where
that baseline is in advance relative to the bounding box.

Put another way, how I can figure out what the descender is for the font
without simply rendering every character first.

What I'm trying to do is simply write each glyph into a bitmap grid. I'd
like that the bitmaps are all placed at the correct height in their cell.

-- 
edA-qa mort-ora-y
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