On Tuesday, July 2, 2002, at 11:39 AM, John Cowan wrote:
>> 1) If you map directly from multiple characters to a single glyph, you
>> t have to include glyphs in your font for all the "pieces" if they're
>> never supposed to appear by themselves. As an extreme example, if I
>> implemented astral character support via ligating surrogate pairs, I'd
>> need to include glyphs for the unpaired surrogates.
> More precisely, you need to have glyph *indexes* that are never mapped
> to glyphs. The actual outlines themselves don't need to exist, AFAIK.
True. I tend to avoid that, because if something goes wrong and the
system attempts to actually *display* one of these virtual glyphs,
disaster would ensue. (Dave Opstad and I have had long debates on the
safety of doing this.)
John H. Jenkins
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