[jira] [Created] (PDFBOX-2842) Overhaul font substitution

["John Hewson (JIRA)" <ji...@apache.org>]

John Hewson created PDFBOX-2842:
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             Summary: Overhaul font substitution
                 Key: PDFBOX-2842
                 URL: https://issues.apache.org/jira/browse/PDFBOX-2842
             Project: PDFBox
          Issue Type: Improvement
          Components: FontBox, PDModel
    Affects Versions: 2.0.0
            Reporter: John Hewson
            Assignee: John Hewson
             Fix For: 2.0.0


The improved font substitution mechanisms in 2.0 are not quite sufficient to handle all PDFs. Specifically, CJK substitution and substitution of TTF in place of CFF fonts is not possible with the current design.

The CJK problems can be seen in PDFBOX-2509 and PDFBOX-2563, which does not solve the problem. Additional font API weaknesses can be found in PDFBOX-2578 and PDFBOX-2366. This meta-issue aims to address all of those sub-issues.

The current problems are:

- FontBox does not provide a generic font type, so we have handle TrueTypeFont, CFFFont, and Type1Font separately. This hinders cross-format substitution.
- ExternalFonts has no knowledge of the CIDSystemInfo which is necessary for CJK substitution
- FontProvider contains too much public logic which should be internal to PDFBox, e.g. substitution logic, this makes it brittle and means we won't be able to add additional logic after 2.0 is released, e.g. CJK substitution.



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