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* Switch engines to be indentified by properties, instead
of hardcoded role/language. (?)
* Get rid of PangoCFont, switch GlyphString to only have one
array - an array of PangoGlyphInfo that includes
index, geometry, visattrs
* Add a PangoLayout highlevel driver
* Add attributes data structures, feed attributed strings
into pango_itemize() (? is this necessary)
* Rethink subsetting algorithms for X - the properties stuff
is just _slow_. (Are we loading the same fonts too many
times? Look into performance in general)
* Return error codes from all functions. Possible errors include
- Invalid string
- Font does not match
* Allow UTF8 strings with embedded NULLs.
* Write a small default shaping engine that only
draws a placeholder character ... and does that in
a way that always works.
* Convert over from utils.c to Tom Tromey's libunicode.
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