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https://issues.apache.org/jira/browse/FOP-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15397760#comment-15397760
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Simone Rondelli commented on FOP-1969:
--------------------------------------
Ok, get it.
One more thing: I found that Control Characters are elided in
MultiByteFont.performSobstitution:
{code:java}
if (!retainControls) {
ogs = elideControls(ogs);
}
{code}
This prevents from correctly show some emoji like 👨👩👦 (formed by
\u1f468\u200d\u1f469\u200d\u1f466). In this case \u200d is elided making
impossible to correctly show the emoji. The value of {retainControls} is
statically set to false in {TextLayoutManager}.
* Is there any reason why this is always false?
* What would be the logic to set it to true?
> 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: testing.fo, testing.fo, testing.pdf, testing.pdf,
> testing.xml, testing.xsl
>
>
> 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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