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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