Aaron Madlon-Kay created PDFBOX-4106:
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Summary: 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
Attachments: 0001-Parse-GSUB-table.patch,
0002-Abstract-cmap-lookup-into-an-interface.patch,
0003-Implement-GSUB-substitution-on-TrueTypeFont.patch,
0004-Use-vhea-vmtx-to-fix-vertical-displacements-in-PCIDF.patch,
0005-Add-factory-methods-for-loading-TTF-as-vertical-font.patch,
0006-Implement-vertical-metrics-support-when-embedding-su.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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