[Webkit-unassigned] [Bug 112488] REGRESSION (r145854): Mongolian characters are not upright in vertical writing mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=112488





--- Comment #51 from SiqinBilige <siqinbilige at gmail.com>  2013-06-15 10:20:11 PST ---
(In reply to comment #10)
> Mongolian and Phags Pa are a bit tricky in UTR#50 and CSS Writing Modes Level 3.
> 
> UTR#50 defines glyph orientation against Unicode code chart. Because Mongolian and Phags Pa are vertical only scripts, the code chart has glyphs for vertical flow, so UTR#50 must define them as U (upright against the code chart.)
> 
> However, some font systems have pre-rotated glyphs for these scripts. This is mentioned in CSS Writing Modes Level 3:
>  # In some systems (e.g. when using OpenType fonts), to correctly orient
>  # a character belonging to the Mongolian or Phags-pa script upright, the
>  # UA must actually typeset it sideways.
> http://dev.w3.org/csswg/css-writing-modes/#vertical-orientations
> 
> So such systems must change the interpretation of UTR#50 U value to R for Mongolian and Phags Pa, specifically:
> U+1800-18AF
> U+A840-A87F


この問題ついて、これからどうれすよいでしょうか、教えてください。

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