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Using Unicode True Type fonts
Ghostscript can handle True Type fonts with the full Unicode character set. For doing that, a third-party software should generate a Postscript or PDF document with a text, which is encoded with the UTF-16 encoding. Ghostscript may be used for converting such Postscript documents to PDF and for re-distilling such PDF documents to PDF subsets.
To render an UTF-16 encoded text, one must do the following :
Provide a True Type font with Unicode Encoding. It must have a cmap table with platformID equals to 3 (Windows), and SpecificID eqials to 1 (Unicode).
Describe the font in lib/cidfmap with special values for the CSI key : [(Artifex) (Unicode) 0].
In the PS or PDF document combine the font with one of CMap Identity-UTF16-H (for the horizontal writing mode) or Identity-UTF16-V (for the vertical writing mode). Those CMaps are distributed with Ghostscript in Resource/CMap.
Please note that /Registry (Adobe) /Ordering (Identity) won't properly work for Unicode documents, especially for the searchability feature (see CID font substitution).