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https://issues.apache.org/jira/browse/PDFBOX-5603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17722461#comment-17722461
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ASF subversion and git services commented on PDFBOX-5603:
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Commit 1909811 from Tilman Hausherr in branch 'pdfbox/trunk'
[ https://svn.apache.org/r1909811 ]
PDFBOX-5603: add reading Multiple Substitution Format 1
> 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
> Priority: Minor
> Labels: gsub
> 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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