You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@pdfbox.apache.org by "Tilman Hausherr (Jira)" <ji...@apache.org> on 2024/04/25 19:11:00 UTC
[jira] [Commented] (PDFBOX-5808) Add support for GSUB Lookup Type 3
[ https://issues.apache.org/jira/browse/PDFBOX-5808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17840923#comment-17840923 ]
Tilman Hausherr commented on PDFBOX-5808:
-----------------------------------------
If possible please submit the changes separately, to make it easier to understand.
> 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
>
> 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
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@pdfbox.apache.org
For additional commands, e-mail: dev-help@pdfbox.apache.org