Hi,
Fontconfig is leveraged during font fall back in Linux, which
improved text
output quality. But font fall back using Fontconfig is not available
for
symbol font, such as below code snippet,
[...]
That lead to some bullet characters can not be displayed correctly
some
times especially for the documents generated by Windows users.
Cross-platform problems with bullets (especially for documents created
on Windows) are most probably caused by the "Symbol" font being
completely different things on different platforms. Please see http://www.openoffice.org/issues/show_bug.cgi?id=92011
for the full story with graphics.
Other than that you raise an interesting question:
I''m not sure whether it's any risk if remove the restriction in
above code
for symbol font. Thanks.
In OOo a font having the unicode-flag means that its code points have
the meaning as specified by the unicode standard whereas the symbol-
flag means that the code points only have a meaning specific to this
font. A fallback for a code point only makes sense when the code point
has a defined semantic. For this reason glyph fallback does not
substitute fonts with the symbol flag.
Of course some symbol fonts are so common that the layout of their
code points is a de-facto standard. If these fonts are not available a
different kind of substitution is performed: the symbol font remapping
substitution. Please see vcl/source/gdi/fontcvt.cxx for the maps from
common symbol fonts to OpenSymbol.
Coming back to your question about removing the restriction to allow
only unicode-fonts for glyph fallback: it would probably impact this
symbol-substitution conversion and introduce "false hits", i.e. the
fall-back of the code point would succeed but the resulting glyph
could look completely different as it is from a different symbol font.
On the other hand removing the restriction for code points outside of
unicode's "private use area" looks promising as only pathological
symbol fonts should be impacted by such a change.
---
Herbert Duerr
[email protected]
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