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map entry:cyberb @ Unicode @ <cyberbit.ttf PidEid = 3, 1 means cyberb < INFIX > = >look at Unicode.sfd = >find the mapping = >charcode = >PidEid = 3, 1 = >glyphs eg cyberb01 = >subfont 01 in Unicode.sfd = >charcodes Infix can be anything, thus the question:given a tfm name, how to find out
whether this is a subfont ?
It is safe to limit the infix to be composed from hexadecimal digits only ?
If so, one possibility is : (1)
while last
-char -of - tfmname is a hexdigit
do
remove the last char from tfmname
do
a lookup for the tfmname
if found an entry with subfont flag then break enddo(2)
Or, when a map entry with subfont flag is scanned,
let pdftex create all the relevant entries.
Which may be a safer and faster solution(but wastes more memory)
Let 's do (2), as infix can be any word.
Implementation:
- let' s have a map entry : cyberb @ Unicode @ <cyberbit.ttf PidEid = 3, 1 - actions:
-read Unicode.sfd
- create corresponding sfd mapping like("01", "Unicode") =
>long[256]
- added those subfont to an AVL tree -
create map entries for cyberb01-- cyberbff,
each has a pointer to the corresponding sfd mapping entry -
extended attributes for map entry:-Pid - Eid - sfd_map -
sfd_mapping:-name:sfd name, eg "Unicode" - infix,
eg "01" - mapping:long[256]
-how to find out whether a sfd has been loaded:
-lookup for any entry with the given sfd
name - functions:-load_sfd -
lookup_subfont -
extend reading map entries -
when writting ttf:-if re - encoded-- >
process like in case of type1 fonts -
if PidEid is being used:-read cmap
tables:store(ttfname, pid, eid)
-search for used chars - use sfd to find the charcodes - look into cmap to
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