[HarfBuzz] Question about shaping with top to bottom direction

[aronsoyol]

Hi,

《ワールドカップ2015》[image: 埋め込み画像 1]
Above is a single run of text itemized by ICU's ScriptRun class.
It consists of USCRIPT_KATAKANA and USCRIPT_COMMON (cjk punctuations and
numbers).
When shaping it with top to bottom direction and paint it. As you see the
orientation of number "2015"'s glyph is not expected. they should be
rotated 90 degrees, but since cjk punctuations which are already rotated by
shape process and numbers has same script code, so what is the right way to
determine whether a glyph should be rotated or not in vertical writing
mode?

-- 
Aron
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