Jan Driesen created FOP-2918:
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Summary: Surrogate pairs not handled in U+10800-U+1083F
Key: FOP-2918
URL: https://issues.apache.org/jira/browse/FOP-2918
Project: FOP
Issue Type: Bug
Components: renderer/pdf
Affects Versions: 2.4
Environment: Windows 10
Reporter: Jan Driesen
Attachments: NotoSansCypriot-Regular.ttf, fop.xconf, input.fo
Fop is not properly handling surrogate pairs for characters in Unicode Block
'Cypriot Syllabary' when rendering PDF.
It tries to resolve the individual surrogate entities. This results in errors
saying the glyphs cannot be found.
The attached test shows a font that supports characters in this range, and an
FO file holding the surrogate characters to be rendered.
Similar issues arise with fonts "MPH 2b Damas"
([https://fedoraproject.org/wiki/MPH_2B_Damase_fonts]) and "Segoe UI Historic"
([https://docs.microsoft.com/en-us/typography/font-list/segoe_ui_historic),]
but the error may differ. [I am unsure whether licensing allows me to add these)
Some fonts (Damas & Noto) result in a "String index out of range". Other fonts
(Segoe) deliver a "ill-formed UTF-16 sequence, contains isolated high surrogate
at end of sequence" FOPException.
We expected this to work thanks to FOP-1969 (fop 2.3).
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