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https://issues.apache.org/jira/browse/PDFBOX-4106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16363710#comment-16363710
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Maruan Sahyoun commented on PDFBOX-4106:
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I've added the patch [~amake] linked to to that ticket.

> Vertical text creation
> ----------------------
>
>                 Key: PDFBOX-4106
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4106
>             Project: PDFBox
>          Issue Type: New Feature
>          Components: FontBox, Parsing, Writing
>            Reporter: Aaron Madlon-Kay
>            Priority: Major
>              Labels: embed, gsub, parsing, vertical
>         Attachments: 
> 0001-Add-OpenTypeScript-class-to-get-OT-script-tags-for-c.patch, 
> 0002-Optimize-Unicode-script-storage-and-lookup.patch, 
> 0003-Parse-GSUB-table.patch, 
> 0004-Abstract-cmap-lookup-into-an-interface.patch, 
> 0005-Implement-GSUB-substitution-on-TrueTypeFont.patch, 
> 0006-Use-vhea-vmtx-to-fix-vertical-displacements-in-PCIDF.patch, 
> 0007-Add-factory-methods-for-loading-TTF-as-vertical-font.patch, 
> 0008-Implement-vertical-metrics-support-when-embedding-subsetting.patch, 
> sample_code.txt, vertical.pdf
>
>
> I needed to output vertical Japanese text, but was stymied by several 
> limitations:
> * No API to load a TTF as Identity-V encoding
> * No support for 'vert' glyph substitution
> * No support for vertical metrics ('vhea' and 'vmtx' tables are parsed but 
> not used at all)
> I have attached a series of patches that implement the above features. 
> Highlights:
> * The GSUB glyph substitution table is parsed (limitation: type 1 lookups 
> only; this is sufficient for many features including 'vert'/'vrt2' vertical 
> glyph substitution)
> * Cmap lookup makes use of GSUB when features are enabled on a TTF
> * 'vhea' and 'vmtx' metrics are applied to PDCIDFont when appropriate, and 
> are embedded/subsetted correctly through the DW2/W2 CIDFont dictionary
> * An API has been added for loading a TTF as a vertical font, setting 
> Identity-V encoding and enabling 'vert'/'vrt2' substitution
> Each patch could approximately be split out into a separate ticket, if 
> desired.
> Also attached is some sample code that exercises these patches and 
> illustrates the effect of vertical glyph positioning. The sample output PDF 
> is also attached.



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