Re: What is a Chinese font?

From: mpsuzuki@hiroshima-u.ac.jp
Date: Tue Feb 26 2008 - 09:05:08 CST

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    Dear Sir,

    Nice to hear the samples were something useful for you.
    Indeed, fontforge is appropriate and easy tool to change
    the values. In fact, I used fontforge for preliminary
    test - afterwards, I used binary editor to make minimum
    modified samples.

    On Tue, 26 Feb 2008 05:51:49 -0600
    vunzndi@vfemail.net wrote:
    >Quoting mpsuzuki@hiroshima-u.ac.jp:
    >> vs17-ucr.ttf:
    >> All bits in UnicodeRange in OS/2 are set,

    >> vs17-cpr.ttf:
    >> All bits in CodePageRange in OS/2 are set,

    >> vs17-ucr+cpr.ttf:
    >> All bits in UnicodeRange and CodePageRange in OS/2 are set.
    >
    >The results provisionally seem to be rather application depednent
    >
    >Some quick test results
    >
    >on Linux (debian)
    >
    >abiword - works with any font including my original
    >
    >on windows
    >
    >abiword - works with any font including my original
    >word - works with either vs17-cpr.ttf or vs17-ucr+cpr.ttf
    >wordpad - various partial results, eg displays vs17-cpr.ttf in
    >pre-existant documents but won't select.

    At present I don't have abiword in my hand - most Linux
    applications let fontconfig library to manage the font
    files, and fontconfig checks the character coverage by
    cmap/loca/glyf, so the UnicodeRange and CodePageRange
    in OS/2 have no effects, I guess. fontconfig-2.2 didn't
    check the complex text layout feature support, but
    fontconfig-2.4 checks GSUB, GPOS and Silf tables to
    pass appropriate fonts to the text layout libraries.

    We can find that Apple reserved a few flags in head table
    to indicate the requirement of complex text layout feature.
    Please check head.flags bit 7,8,9,10 and head.fontDirectionHint in
            http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6head.html
    OpenType specification does not carry over these flags.
    However, yet I've not investigated how Mac OS font
    framework check these values.

    Regards,
    mpsuzuki

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