[XeTeX] Access to the bounding box of a glyph

[SUN Wenchang]

Dear All,
 
Is it possible to get the bounding box of a glyph? If not, is it possible to add a XeTeX primitive to do this?
 
This information is very useful when typesetting Chinese (maybe also Japanese and Korean) full-width punctuation. For example, if we know the bounding box of the period mark is 243 523 558 742,then we can replace the period mark as
 
 [period mark]\vrule width -0.342em depth \z@ height \z@\hskip 0.342em The "\vrule...\hskip..." structure can gobble the blank space right to the glyph when it appears at the end of a line. As a result, we can align the line boundary.
 
Best,
Wenchang
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