Hi, In vertical rendering mode of freetype, glyphs are placed center-aligned around vertical baseline, which however seems to be a bug.
I have done some simple tests and compared the result of freetype (plus harfbuzz) with those wordpad on windows 8.1 and textedit on mac os x 10.9. In all three cases, Source Han Sans [1], a free pan-CJK font recently released by Adobe, was used. The text used for testing was <U+65E5 U+302A U+0049 U+004D U+65E5>. Attached image file is the result of comparison. As shown in the image, only freetype puts glyphs center-aligned. So there seems to be a bug in freetype's vertical rendering mode. FYI, this issue has been spotted while pondering over how to support vertical typesetting of combining Hangul Jamo characters, on which a discussion is going on at issue tracker of Source Han Sans. [2] [1] http://sourceforge.net/adobe/source-han-sans/wiki/Home/ [2] https://github.com/adobe-fonts/source-han-sans/issues/34 Best Regards, -- Dohyun Kim Seoul, Republic of Korea
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