[Devel] Windows GDI Vertical Glyph Positioning

[Barry Will]

Hi!

I'm writing a Windows device driver for a graphics-type device that would be 
able to render truetype fonts for vertical-style text (chinese, japanese, 
etc.).

Right now I am a bit puzzled regarding the x,y coordinate system the Windows 
GDI is using when rendering vertical text.

On my device driver, the rendered vertical glyphs are slightly off-center.

Does anyone know the assumptions Windows GDI makes regarding x,y positioning 
of glyphs?  (Btw, according to some documents I found on the web, the 
x,y-origin for vertical text on FreeType should be in the center of the 
glyph.  However, on Windows this doesn't seem to be the case.  It seems that 
the x,y-origin is located differently.)

Any links to references and documents will be appreciated.

Thanks in advance.

Barry


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