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From "Dan Caprioara (Jira)" <j...@apache.org>
Subject [jira] [Created] (FOP-2938) Incomplete TTF subset files - incomplete mapping between CIDs and codepoints when having two codepoints associated to the same glyph
Date Mon, 18 May 2020 08:57:00 GMT
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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