From: John Hudson (email@example.com)
Date: Mon Nov 24 2008 - 15:39:47 CST
Asmus Freytag wrote:
> I think that an algorithm could have generic tables that capture some
> aspects of typical ink distribution for certain characters. For example,
> the generic fact that the typical A is trigonal, whereas O or U etc.
> typically touch the base only in the center. Having some canned
> information like that beats having information for each individual pair.
> If this info fails for any specific font - well, it's intended as a
> better fallback.
Which is why I said that the algorithmic approach won't be able to
handle some things *reliably*. As a fallback, the algorithms may provide
better positioning than a blind offset, but for what I consider reliable
mark positioning design-specific anchors are necessary.
> I also think that if such algorithms were more widely deployed, it would
> be advantageous if there was a way for font suppliers to create and make
> accessible generic flattened forms of diacritics. That's still cheaper
> than designing all the specific combinations.
Note that I, for one, am not advocating designing all the combinations
of bases plus marks (that either might occur or might be defined as a
desirable subset). Indeed, I wish the encoding and layout circumstances
were such that I had to make a lot fewer precomposed diacritics than I
am currently obliged to: if all text were NFD'd, fonts could be a heck
of a lot smaller, requiring precomposed glyphs only for those diacritics
whose visual form differs from appropriately positioned base+mark glyph
If a font developer has gone to the trouble of designing flattened
diacritics for use above capital letters, and has built precomposed
diacritic glyphs for those that are directly encoded in Unicode, he is
well on the way to having the shapes and data necessary to provide
decent anchor positioning for marks.
-- Tiro Typeworks www.tiro.com Gulf Islands, BC firstname.lastname@example.org You can't build a healthy democracy with people who believe in little green men from Venus. -- Arthur C. Clark
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