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https://issues.apache.org/jira/browse/FOP-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15509425#comment-15509425
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Simone Rondelli commented on FOP-1969:
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I think that I get were is the case. In the ligatures the glyph get assigned a
single character created with the {{MultiByteFont.createPrivateUsageMapping(int
gi)}}.
Eg: In the Emoji case the following text
{{\uD83D\uDC68\u200D\uD83D\uDC69\u200D\uD83D\uDC66}} (👨👩👦 ) get assigned the
character 57344 (\uDFF6 -> lower surrogate).
> Surrogate pairs not treated as single unicode codepoint for display purposes
> ----------------------------------------------------------------------------
>
> Key: FOP-1969
> URL: https://issues.apache.org/jira/browse/FOP-1969
> Project: FOP
> Issue Type: Improvement
> Components: unqualified
> Affects Versions: trunk
> Environment: Operating System: All
> Platform: All
> Reporter: Glenn Adams
> Attachments: Urdu.zip, pcltest.zip, single-byte.zip, testing.fo,
> testing.fo, testing.pdf, testing.pdf, testing.xml, testing.xsl, tiffttc.zip
>
>
> 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;
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