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https://issues.apache.org/jira/browse/FOP-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15398627#comment-15398627
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Glenn Adams commented on FOP-1969:
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| If I understand correctly the semantic of elide controls you want something
like this:
|
| characters: \u1f468\u1f469\u1f466
| glyphs: 1643
| association: [0, 3]
elideControls() does not change the original characters array, it only removes
(elides) glyphs associated with elidable control characters in the original
characters array;
you need to step through the code in elideControls in an IDE in order to find
why it isn't inserting the non-elided glyphs
> 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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