Re: Support emoji fonts

[郭云鹤 <guoyunhebrave@xxxxxxxxx>]

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@xxxxxxxxx> 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

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@xxxxxxxxx> 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@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/fontconfig

--

Akira TAGOH

--
Guo Yunhe

--

Akira TAGOH

--
郭云鹤

_______________________________________________
Fontconfig mailing list
Fontconfig@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/fontconfig