[jira] [Assigned] (PDFBOX-5648) Support GSUB LookupType 2 (Multiple Substitution Format 1), part 2

["Tilman Hausherr (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-5648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tilman Hausherr reassigned PDFBOX-5648:
---------------------------------------

    Assignee: Tilman Hausherr

> Support GSUB LookupType 2 (Multiple Substitution Format 1), part 2
> ------------------------------------------------------------------
>
>                 Key: PDFBOX-5648
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5648
>             Project: PDFBox
>          Issue Type: New Feature
>          Components: FontBox
>    Affects Versions: 3.0.0 PDFBox
>            Reporter: Tilman Hausherr
>            Assignee: Tilman Hausherr
>            Priority: Minor
>              Labels: gsub
>             Fix For: 4.0.0
>
>
> 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. The first step has been done in PDFBOX-5603 which is reading these tables. This is the second step, actually doing anything with it. 
> 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.



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