> I am reading the part II of the tutorial and in section 3.b, it says
> face->size->metrics.height is the only field of face->size->metrics
> one should really use.
Read:
... face->size->metrics.height is the only field of
face->size->metrics which is useful in general.
> In other words, it says face->size->metrics.max_advance should not
> be used. But then how should one render equally-spaced string?
You mean to render glyphs equally-spaced even if the glyphs have
different widths?
> I have this question because I imagined that this is done by
> rendering each glyph and advancing the pen position by, instead of
> the glyph's advance width, face's max advance width. If this is not
> the case, then what should be used as the common advance width?
Well, `max_advance' is not a reliable value. Most CJK fonts which are
declared as `monospaced' have both single-width and double-width
glyphs. This is unfortunate, but it is rather simple code to check
this.
IMHO you have to trust the font, this is, to use the glyph's advance
widths. A (non-CJK) font which declares itself as monospaced but has
non-equal widths is simply broken.
Werner
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