>> Finally, the correct way to embolden glyphs without increasing the
>> advance width is to *move* the glyphs themselves a little to the
>> left after emboldening! Otherwise it can happen that the very
>> right of emboldened glyph gets overwritten (or cut off) by the next
>> glyph.
>
> But then, that could cause overwriting/cutting off on the left.
This is much more unlikely. A glyph's advance width normally looks
like this.
+-----+====================+-----+
^ ^ ^
left side bearing | right side bearing
|
glyph's bbox width
The emboldening code increases all three values.
+--------+==========================+--------+
If you squeeze this into the old advance width, you get this.
+-------+========================+
As can be seen, the glyph gets cut off. However, if you center the
new bbox width, chances are high that it works as expected.
+--+==========================+--+
Werner
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