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https://issues.apache.org/jira/browse/PDFBOX-5808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr updated PDFBOX-5808:
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    Attachment: screenshot-2.png

> 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
>            Priority: Major
>         Attachments: screenshot-1.png, screenshot-2.png
>
>
> 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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