About "glyph fallback" message (vcl module)

Christian Lohmaier lohmaier at googlemail.com
Fri May 2 07:02:52 PDT 2014

Hi Julien, *,

On Friday, May 2, 2014, julien2412 <serval2412 at yahoo.fr> wrote:

> Hello,
> On pc Debian x86-64 with master source updated yesterday, I've got this
> message on console when going to Options/Language Settings/Languages:
> warn:vcl:26860:1:vcl/generic/fontmanager/fontconfig.cxx:868: In glyph
> fallback throwing away the language property of en because the detected
> script for '0x9f3' is Bengali and that language doesn't make sense.
> Autodetecting instead.

without looking at the code that creates the info message:

The unicode character 0x9f3 is from Devanagari script, so the text it
belongs to cannot be written in english. Thus the code ignores the language
that is set for the text.

and glyph fallback genrerally occurs when the chosen font doesn't contain a
requested character. LO then looks for other fonts that contain it. And
amongst other criteria, the language of a text is also used to pick a
suitable font. While Japaenes and Chinese for example have the same unicode
value for many Kanji characters, the way it is written can differ, besides
the gerneral style of the font.

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