Aaron Madlon-Kay updated PDFBOX-4106:
    Attachment:     (was: 

> 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: 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.

This message was sent by Atlassian JIRA

To unsubscribe, e-mail: dev-unsubscr...@pdfbox.apache.org
For additional commands, e-mail: dev-h...@pdfbox.apache.org

Reply via email to