Dan Caprioara created FOP-2938:
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Summary: Incomplete TTF subset files - incomplete mapping between
CIDs and codepoints when having two codepoints associated to the same glyph
Key: FOP-2938
URL: https://issues.apache.org/jira/browse/FOP-2938
Project: FOP
Issue Type: Bug
Components: font/opentype
Affects Versions: 2.5
Reporter: Dan Caprioara
Attachments: CIDFonts Subset Architectural Problem.png
A generic problem appears for MultiByte CID fonts.
Because of a limitation of the CIDSubset implemenatation, once a glyph has
been used for a code point, next usages of the same glyph for other codepoints
are discarded. This results in incomplete tables in the TTF sub set file. The
structures from CIDSubset class are maps, limiting expressiveness.
In the next diagram I used hyphens and soft hyphens, just as an example, any
text with two different characters that map to the same glyph is affected.
See this attached sketch for details:
!CIDFonts Subset Architectural Problem.png!
The solution would be to avoid usage of hash maps, and create some associative
lists (currently the uniqueness of the keys breaks things).
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