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https://issues.apache.org/jira/browse/PDFBOX-4189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16438609#comment-16438609
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Maruan Sahyoun commented on PDFBOX-4189:
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The patch is a great and - given several questions we had in the past -
important addition to PDFBox.
On the longer run I'd see some additions we might conceptually already think
about and/or start introducing in the public API. As I haven't reviewed the
patch the below list is meant to be a hint for possible addition. They may
already be included
For correct text positioning using mixed language information from the
following tables might be useful:
- GPOS: to adjust the glyph position
- BASE: baseline offsets on a script-by-script basis.
- JSTF: justification information, including whitespace and Kashida adjustments.
- BIDI Mirroring: https://www.unicode.org/Public/10.0.0/ucd/BidiMirroring.txt
To allow the user to override the language system identified by the script
being used we might want to add {{setLanguage/getLanguage}} so that can be
called prior to {{showText}} if an override needs to be done.
Putting that into an internal {{layout}} method as John suggested would also
allow us to put it behind a feature flag where one could enable/disable the
processing. We might also mark that feature as **experimental** and specify
which languages it has been tested with (to some extend).
> Enable rendering of Indian languages, by reading and utilizing the GSUB table
> -----------------------------------------------------------------------------
>
> Key: PDFBOX-4189
> URL: https://issues.apache.org/jira/browse/PDFBOX-4189
> Project: PDFBox
> Issue Type: New Feature
> Components: FontBox, PDModel
> Reporter: Palash Ray
> Priority: Major
> Attachments: Bengali-text-after.pdf, Bengali-text-before.pdf
>
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> Implemented proper rendering of Indian languages, which need extensive Glyph
> substitution. The GSUB table has been read and used effectively to replace
> some compound words with their respective Glyphs. All tests are passing. I
> have tested this for the Bengali font. Please review these changes and let me
> know if it makes sense to incorporate these.
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