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Re: [ft] Vertical Text and Rotated Characters

From: suzuki toshiya
Subject: Re: [ft] Vertical Text and Rotated Characters
Date: Fri, 18 Oct 2013 09:53:02 +0900
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130518 Icedove/17.0.5


The glyph rotation (rather, the picking the rotated glyph by the glyph
ID substitution) for the vertical writing mode is (now) classified
as a part of complex text layout for the internationalization (e.g.
Arabic, Indic, etc). Thus, now FreeType2 developers are thinking it's
a role of higher level library dealing with OpenType or TrueType GX,
like, HarfBuzz, ICU, etc.

If you have more specific interest (e.g. PostScript CID-keyed font
which can access vertical writing mode glyph without OpenType feature),
please let me know.


On 10/18/2013 07:41 AM, Darrell Bellert wrote:
> Greetings -
> I am using freetype2 to render Asian characters in a vertical layout. 
> Although I am just beginning this task, I noticed that freetype seems to 
> rotate all characters by 90 degrees when rasterizing in a vertical layout.  
> Although this is desirable for latin characters, this is not what I want for 
> Asian characters.  I still want Asian characters to remain oriented upright 
> and non-rotated.
> Is the general assumption that it is the developer's responsibility to handle 
> such cases?  So, for Asian character ID's, I should not request vertical 
> layout of freetype - yet if I do that, how do I get vertical metrics for 
> proper layout?  Is there some missing functionality in freetype that I am 
> missing concerning the rotation of some characters in vertical layout?  Any 
> pointers or background knowledge would be helpful here and greatly 
> appreciated.
> Thanks,
> Darrell
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