[Fontconfig] Support emoji fonts

[Guo Yunhe]

Got reply from Unicode mail list. From their suggestion, the Japanese 
emoji by DoCoMo, KDDI, SoftBank, could be such a necessary subset. 
http://unicode.org/Public/UCD/latest/ucd/EmojiSources.txt/
/

    /​At this point, the original set of Japanese emoji has long since
    been surpassed. The recommendation is to support the set of emoji in
    the data files referenced by
    //http://www.unicode.org/reports/tr51///. There's much more
    information about various choices there./
    /
    /
    /Note that there is a proposed new version that will be discussed in
    early November, at
    //http://www.unicode.org/reports/tr51/proposed.html//​, with
    additional emoji focused around gender support./

    /
    Mark
    /


在 2016年09月08日 03:44, suzuki toshiya 写道:
> Oops,
>
>> cellarphone. However, I don't think recent emoji
>> pushers do not care about this subset.
> I mean: however, I don't think recent emoji
> pushers care about this subset.
>
> Regards,
> mpsuzuki
>
>
> suzuki toshiya wrote::
>> Dear Tagoh-san,
>>
>> One of the recognizable subset would be the set to
>> interchange original "emoji" used by legacy Japanese
>> cellarphone. However, I don't think recent emoji
>> pushers do not care about this subset.
>>
>> To consider other new emojis, should we ask for the
>> comments from Unicode (or ISO/IEC JTC1/SC2/WG2) experts,
>> to define the subset to judge whether the font is
>> sufficient to use to display emojis.
>>
>> Also I'm interested in that fontconfig is expected
>> to pick the font supporting color glyphs, and/or,
>> supporting VS to display existing symbols with emoji-
>> style.
>>
>> Regards,
>> mpsuzuki
>>
>> Akira TAGOH wrote::
>>> Well, you may misunderstood my question. let me rephrase. the question
>>> is, is a font required to contain all of them to say "our fonts support
>>> emoji" or to indicate that in fontconfig? and how many emoji fonts has
>>> supported all of them at this moment? in other words, if a font is more
>>> or less missing them, it won't be recognized as emoji-aware.
>>> I don't see any mention about it there at least. .orth files in
>>> fontconfig doesn't contain all of Unicode code points which is used in
>>> those languages because some of them isn't often used and may not be
>>> implemented for priority etc.
>>>
>>> On Wed, Sep 7, 2016 at 8:30 PM, Guo Yunhe <guoyunhebrave at gmail.com
>>> <mailto:guoyunhebrave at gmail.com>> wrote:
>>>
>>>      Here is the official define of emoji characters. (Opening this page
>>>      may hang your browser for a while!!!)
>>>      http://unicode.org/emoji/charts/full-emoji-list.html
>>>      <http://unicode.org/emoji/charts/full-emoji-list.html>
>>>
>>>      Hope it would be helpful.
>>>
>>>      在 2016年09月07日 14:21, Akira TAGOH 写道:
>>>>      The problem on that idea is how to figure out what the minimal
>>>>      coverage in emoji block. at this point, the minimal glyph coverage
>>>>      for langs are defined in fc-lang/*.orth and cache files contains
>>>>      lang property only which fonts satisfies the coverage for. if
>>>>      there are any specs defining a must or an optional to have, that
>>>>      may be helpful otherwise we may need to think about another idea
>>>>      for that.
>>>>
>>>>      maybe good to have a property in a cache to indicate if a font has
>>>>      an emoji or not, and we could leave the way to use it to
>>>>      applications perhaps.
>>>>
>>>>      On Wed, Sep 7, 2016 at 4:28 PM, Guo Yunhe <guoyunhebrave at gmail.com
>>>>      <mailto:guoyunhebrave at gmail.com>> wrote:
>>>>
>>>>          Hi, I recently studied some emoji fonts. These emoji fonts
>>>>          have fontconfig difficulties when packaging. They try to set
>>>>          the font as default emoji font but do not affect others.
>>>>          Usually the font has a separated configure file.
>>>>
>>>>          <match>
>>>>            <test name="family">
>>>>              <string>sans-serif</string>
>>>>            </test>
>>>>            <edit binding="strong" name="family">
>>>>              <string>Nimbus Sans L</string>
>>>>              <string>EmojiOne Color</string>
>>>>            </edit>
>>>>          </match>
>>>>
>>>>          However, this will affect sans-serif font settings of other
>>>>          font packages or users' setting, because the package do not
>>>>          know which sans-serif font users want to use.
>>>>
>>>>          I suggest maybe we can map the Unicode emoji block as test
>>>>          condition. Just like when we set a Japanese font, it won't
>>>>          affect English and Arabic fonts.
>>>>
>>>>          <match>
>>>>            <test name="family">
>>>>              <string>sans-serif</string>
>>>>            </test>
>>>>            <test name="lang">
>>>>              <string>emoji</string>
>>>>            </test>
>>>>            <edit binding="strong" name="family">
>>>>              <string>EmojiOne Color</string>
>>>>            </edit>
>>>>          </match>
>>>>
>>>>
>>>>
>>>>          --
>>>>          Guo Yunhe
>>>>          _______________________________________________
>>>>          Fontconfig mailing list
>>>>          Fontconfig at lists.freedesktop.org
>>>>          <mailto:Fontconfig at lists.freedesktop.org>
>>>>          https://lists.freedesktop.org/mailman/listinfo/fontconfig
>>>>          <https://lists.freedesktop.org/mailman/listinfo/fontconfig>
>>>>
>>>>
>>>>
>>>>
>>>>      --
>>>>      Akira TAGOH
>>>      --
>>>      Guo Yunhe
>>>
>>>
>>>
>>>
>>> -- 
>>> Akira TAGOH
>>>

-- 
Guo Yunhe
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