I am a bit confused about the number and scaling of different font metrics.

For my program I am searching for the maximum distance above/under the baseline of a given font in the scaling of the pixels after rendering. I have tried it with "Face.bbox.yMin / yMax", but I dont know about the right scaling to get it to pixel units.
Do I need the "Face.units_per_EM" for that?

The other metric I need is the width of the string. I calculated it as the sum over "Face.glyph.advance.x/64" of all glyphs. ( with "FT_Set_Char_Size(face, fontSize*64., fontSize*64., 100, 100);" )
Is that the correct value?

Thank you for any help.

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