Fabrice Calafat created PDFBOX-5808:
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Summary: Add support for GSUB Lookup Type 3
Key: PDFBOX-5808
URL: https://issues.apache.org/jira/browse/PDFBOX-5808
Project: PDFBox
Issue Type: New Feature
Components: FontBox
Affects Versions: 3.0.2 PDFBox
Reporter: Fabrice Calafat
Add support for the lookup type 3, Alternate Substitution when handling GSUB:
[https://learn.microsoft.com/en-us/typography/opentype/spec/gsub#AS]
The first available substitution glyph can be used (as done in other libraries)
Also, the current implementation of CompoundCharacterTokenizer doesn't account
for collision in ligatures
For example, if a font supports ligatures for _att_ and {_}en{_}, the current
implementation will not tokenize properly for the word _attention._ This is
because the regex implementation doesn't allow for a proper split
I'll open a proposed implementation for the above
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