[Devel] vertical substitution

[David Vincent]

Hello,

We'd like our application to be able handle vertical glyph substitution 
when a TrueType font provides alternate glyphs by way of the 'mort' or 
'morx' tables.  This isn't working at the moment - the same glyphs are 
always used regardless of writing mode.  As far as I can see this is 
because our application is relying on FreeType (FT) to select the glyph, 
but FT ignores 'mort' and 'morx'.

I can think of two approaches we might take.

(1)  We call FT to get the 'mort' or 'morx' table and then process the 
table in the application.  The application selects whatever glyph the 
table dictates before asking FT to render it.

(2)  We build or obtain an extension or enhancement to FT that gives it 
the ability to select the appropriate glyph.

My reading of the FT documentation, FAQ and mailing lists leads me to 
think that FT developers would favour (1) rather than (2).  FAQ question 
I.3 says "operations like glyph substitution ... are not part of a font 
service".

Is this a fair assessment?


Regards,

David Vincent.

--
David A Vincent                   address@hidden
Software Engineer                telephone +61 2 9850-2593
RESEARCH AND DEVELOPMENT  TOSHIBA (AUSTRALIA) PTY. LIMITED
 "...  plans are useless, but planning is indispensable"


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