Etienne-Gautier opened a new pull request, #986:
URL: https://github.com/apache/poi/pull/986
# Context
I'd like to better support DOCX theme fonts, but currently they are
inaccessible.
For anyone interested, a run can define fonts either
- directly `"ascii"="Times New Roman"`
- indirectly via a theme
Currently the XWPFTheme doesn't expose major/minor fonts to resolve theme
fonts, so I am fixing that in this PR.
Note: I spent a bit of time figuring out how the theme fonts are resolved
and I thought I'd write it down somewhere. So for anyone interested, a run
might look like this:
```xml
<w:r>
<w:rPr>
<w:rFonts w:ascii="Aleo" w:asciiTheme="majorBidi"
w:hAnsiTheme="majorBidi" w:cstheme="majorBidi"/>
</w:rPr>
<w:t>Some text with font from theme</w:t>
</w:r>
```
With settings containing
```xml
<w:themeFontLang w:val="en-AU" w:bidi="ja-JP"/>
```
And a Theme like this:
```xml
<a:fontScheme name="Office">
<a:majorFont>
<a:latin typeface="Aptos Display" panose="02110004020202020204"/>
<a:ea typeface=""/>
<a:cs typeface="Segoe UI"/>
<a:font script="Jpan" typeface="游ゴシック Light"/>
</a:majorFont>
<a:minorFont>
<a:latin typeface="Aptos" panose="02110004020202020204"/>
<a:ea typeface=""/>
<a:cs typeface=""/>
<a:font script="Jpan" typeface="游明朝"/>
</a:minorFont>
```
This theme font can be interpreted by combining info from the document
settings (`themeFontLang`) and themes. There is an explanation of that in the
spec at `17.15.1.88 themeFontLang (Theme Font Languages)`. However that
explanation doesn't really tell you how to map the locale code (for example
`ja-JP`) from `themeFontLang` to a script (for example `Jpan`).
I found that:
- POI's `LocaleID.lookupByLanguageTag(localeName)` can read the locale.
- Then the logic from Libreoffice
[here](https://github.com/LibreOffice/core/blob/master/sw/source/writerfilter/dmapper/ThemeHandler.cxx#L21)
can easily be ported from java to map a `localeID.getLcid()` to a script. We
can then lookup the major/minor theme font with that script
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