https://bugs.freedesktop.org/show_bug.cgi?id=58922
Priority: medium
Bug ID: 58922
Assignee: libreoffice-bugs@lists.freedesktop.org
Summary: OT layout engine: problem with combining glyph +
zero-width-mark + glyph
Severity: normal
Classification: Unclassified
OS: All
Reporter: elie.r...@telecom-bretagne.eu
Hardware: Other
Status: UNCONFIRMED
Version: 3.6.4.3 release
Component: Writer
Product: LibreOffice
Created attachment 72363
--> https://bugs.freedesktop.org/attachment.cgi?id=72363&action=edit
Font showing the bug
When using writer if I type the text གཚོའི་ཁིའུ་ using the attached font
TestLig.ttf, I can see a buggy result (I'll attach the result in a later note),
with an enormous space between the two syllables. The correct result is
basically the same but without the space, I'll attach a correct result also in
a later note.
This bug comes from a quite rare use case in the layout engine: the font
contains in a ccmp table (lookup 2) the ligature: uni0F7C(ོ) uni0F60(འ)
uni0F72(ི) -> uni0F7Cuni0F60uni0F72 : the first is zero-width mark apllying to
a glyph (in my example ཚ), and the second is not (the third doesn't really
matter here), the result is thus a non-zero-width mark... Some OT layout
engines also have difficulties with this case:
- ConTeXt/LuaTeX had the same bug but I reported it and it's now fixed
- on Debian stable, the layout engine behind gedit has it too
- harfbuzz seems to handle it correctly.
Please tell me if I can provide more information or if I should report it to
some other place (ICU ?).
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