Tilman Hausherr created PDFBOX-5603:
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             Summary: Support GSUB LookupType 2 (Multiple Substitution Format 1)
                 Key: PDFBOX-5603
                 URL: https://issues.apache.org/jira/browse/PDFBOX-5603
             Project: PDFBox
          Issue Type: Improvement
          Components: FontBox
            Reporter: Tilman Hausherr
             Fix For: 3.0.0 PDFBox


This table is the reverse of ligatures, i.e. replace one glyph with several 
glyphs. I don't know if this is useful at all for us, except understanding the 
current implementation.

This will be implemented in two steps. Reading these tables is one thing, 
actually doing anything with it is another, because MapBackedGsubData has a 
{{Map<List<Integer>, Integer>}} which is not useful here. Either we'd have to 
introduce a second map, or extend the map so that the value is also a list. 
I'll do just the first part for now, which I expect to stay regardless of 
changes for the second part.



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