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https://issues.apache.org/jira/browse/PDFBOX-5808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17841439#comment-17841439
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Tilman Hausherr edited comment on PDFBOX-5808 at 4/27/24 9:32 AM:
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I also tested the "aalt" feature with the FiraCode-Regular font, there's a
weird bug, but it's not related to your changes. "fira" becomes "ѐiҟa", this
has been fixed in PDFBOX-5810. Now it's " ira", but this is what's in the
table. Maybe this is meant to be combined with other lookup lists that haven't
been implemented yet.
was (Author: tilman):
I also tested the "aalt" feature with the FiraCode-Regular font, there's a
weird bug, but it's not related to your changes. "fira" becomes "ѐiҟa", this
will be fixed in PDFBOX-5810.
> 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, screenshot-3.png,
> screenshot-4.png, screenshot-5.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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