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https://issues.apache.org/jira/browse/PDFBOX-6103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18040443#comment-18040443
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Fabrice Calafat commented on PDFBOX-6103:
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I've updated the pull request and removed the Roboto font, and using only
Josefin to validate the feature. Let me know if that works for you!
> Add DFLT script support in GSUB system for OpenType fonts
> ---------------------------------------------------------
>
> Key: PDFBOX-6103
> URL: https://issues.apache.org/jira/browse/PDFBOX-6103
> Project: PDFBox
> Issue Type: New Feature
> Components: FontBox
> Affects Versions: 3.0.6 PDFBox
> Reporter: Fabrice Calafat
> Priority: Minor
>
> Currently, the PDFBox GSUB (Glyph Substitution) system does not handle the
> DFLT (default) script tag defined in the OpenType specification. According to
> the OpenType spec, the DFLT script table is used to
> define features that are not script-specific and should be applied when:
> 1. No script table exists for the specific script of the text being
> processed
> 2. Text lacks a defined script (containing only symbols or punctuation)
> * Impact:*
> Fonts that rely on DFLT script features may not render correctly,
> particularly when processing text containing symbols, punctuation, or
> unsupported scripts.
> *Solution:*
> This patch adds a new GsubWorkerForDflt class that implements
> script-neutral typographic features according to OpenType standards. The
> implementation:
> - Creates a dedicated GSUB worker for handling DFLT script
> - Integrates with the existing GsubWorkerFactory
> - Applies common typographic features in the standard recommended order
> - Follows OpenType specification guidelines for universal glyph
> substitutions
> *Testing:*
> Comprehensive unit tests have been added using real-world fonts
> (JosefinSans-Italic.ttf and RobotoMono-Regular.ttf) to verify correct DFLT
> script processing.
> *Reference:*
>
> https://learn.microsoft.com/en-us/typography/opentype/spec/chapter2#scriptlist-table
> *Pull request*
> https://github.com/apache/pdfbox/pull/351
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