How to get glyph metric info of CID-keyed font?

From	Jinsong Zhao <jszhao@yeah.net>
Newsgroups	comp.lang.postscript
Subject	How to get glyph metric info of CID-keyed font?
Date	2017-04-09 15:56 +0800
Organization	A noiseless patient Spider
Message-ID	<occp90$tl6$1@dont-email.me> (permalink)

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Hi there,

I am using R (www.r-project.org) to plot statistical figure. I prefer to 
use postscript device. Instead of Type1 fonts, I hope to use Truetype or 
Opentype fonts in my figure, that means I have to use CIDFont function. 
I read the help page of CIDFont function which state that the CID-keyed 
font are intended only for use for the glyphs of East Asian languages 
that are all treated as filling the same bounding box. In the source 
code of ``devPS.c'', the ascent, descent and width of glyph is assumed, 
and not calculated based on actual font. In fact, I think, R can't get 
the exact metric info for the glyph in CID-keyed font, and can't typeset 
correctly or beautifully. It seems that R can't find or access to the 
actual font. After output to a postscript file, Ghostscript with 
correctly configuration can render the figure correctly.

My question is how to get glyph metric info of CID-keyed font in C code 
directly or by call Ghostscript?

Any help will be really appreciated, and thanks in advance.

Best,
Jinsong

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How to get glyph metric info of CID-keyed font? Jinsong Zhao <jszhao@yeah.net> - 2017-04-09 15:56 +0800
  Re: How to get glyph metric info of CID-keyed font? ken <ken@spamcop.net> - 2017-04-10 08:13 +0100
    Re: How to get glyph metric info of CID-keyed font? Jinsong Zhao <jszhao@yeah.net> - 2017-04-18 11:32 +0800

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