Re: Re: emoji modifier support

Hi,

The Skin Tone modifier is working as a combining character,
so it must be handled at the level higher than FreeType.

FreeType does not return the image of "À" (U+00C0) from
the sequence "A" + "`" (U+0041, U+0300) , even if the
specified font has a precomposed glyph which is accessible
from GSUB table.

I guess HarfBuzz has already supported the skin tone modifier,
according to here:

https://ja.overleaf.com/learn/latex/Articles/An_overview_of_technologies_supporting_the_use_of_colour_emoji_fonts_in_LaTeX#Exploring_HarfBuzz

Regards,
mpsuzuki

On 2022/01/21 18:17, Werner LEMBERG wrote:
> 
>> We would like to implement the colored font feature of freetype to
>> manage colored emoji.
>>
>> We already have a POC with colored emoji, but we have seen that some
>> of the glyph in our font (Segoe UI Emoji) are associated with a skin
>> tone modifier base on Fitzpatrick scale.
>>
>> We don't really know how to manage this.
>>
>> Is this something managed by the freetype library?
> 
> I'm not an expert, but as far as I know this has to be handled at a
> higher level by using Emoji ZWJ Sequences.
> 
>    https://unicode.org/emoji/charts/emoji-zwj-sequences.html
> 
> Dominik, can you give more information?
> 
> 
>      Werner
>