Yannis Haralambous wrote:
the original DVI format already supports 4-byte character, what more
Unicode-savviness do you need? Of course one should decide whether DVI
should contain glyph indexes or Unicode codepoints.
I'd like bidirectional information to be available.
Unless you mean by Unicode-savviness that one should have both glyph
indexes and Unicode codepoints (I think that's what XeTeX is doing). A
very bad approach since character and glyph correspondances are
many-to-many.
On the other hand, if we use just glyph indexes in the DVI file then we
can hardly do anything with it than print it (going to PDF will be
difficult since the correspondance with characters is lost).
Thank you for this, Yannis.
What I want is for LuaTeX and XeTeX to have a shared 'extended dvi
format' which is suitable for print, for generating PDF and possibly
other purposes.
And of course I'd like this format to be of at least satisfactory
technical quality.
My (inexpert) understanding is that the Unicode code-point to glyph
index mapping is a property of the font:
http://www.microsoft.com/typography/otspec/cmap.htm
Yannis: I admire both yourself and Jonathan Kew as experts in fonts,
and so it worries me that you say that XeTeX is adopting a "very bad
approach".
I'm copying this to Jonathan Kew.
--
Jonathan
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