[FOP-1969] Support for unicode Surrogate pairs

• Type: Improvement
• Status: Resolved
• Resolution: Fixed
• Affects Version/s: 2.5
• Fix Version/s: 2.3
• Component/s: unqualified
• Environment: Operating System: All; Platform: All
• External issue ID: 51843
• Assignee: Simon Steiner
• Reporter: Glenn Adams
• Created: 19/Sep/11 01:35
• Updated: 16/May/18 09:33
• Resolved: 19/Mar/18 08:51

Description

unicode codepoints outside of the BMP (base multilingual plane), i.e., whose scalar value is greater than 0xFFFF (65535), are coded as UTF-16 surrogate pairs in Java strings, which pair should be treated as a single codepoint for the purpose of mapping to a glyph in a font (that supports extra-BMP mappings);

at present, FOP does not correctly handle this case in simple (non complex script) rendering paths;

furthermore, though some support has been added to handle this in the complex script rendering path, it has not yet been tested, so is not necessarily working there either;

 

fop test.fo -c fop.xconf out.pdf

Glyphs should be rendered

Issue Links

• relates to: FOP-2638 FOText.getScript() may prevent gsub/gpos application
• links to: GitHub Pull Request #3