[Fontconfig] Support emoji fonts

[郭云鹤]

Here are a few emoji fonts: Noto Emoji, EmojiOne, Twemoji. My 
expectation is that users can specify which font to use for rendering 
Emoji characters. Unicode standard has a set of all Emoji characters but 
all emoji fonts only implement a subset. Just like all Chinese fonts 
contain a different subset of fonts. Here is no standard minimum subset. 
Does it means that without minimum subset, fontconfig cannot support Emoji?


在 2016年09月08日 03:01, Akira TAGOH 写道:
> 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

-- 
郭云鹤
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