[Webkit-unassigned] [Bug 191976] [FreeType] Noto Color Emoji is partially used

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191976

--- Comment #5 from Myles C. Maxfield <mmaxfield at apple.com> ---
font-family: Arial, sans; should still work with combining emoji.

When performing font fallback, the first step is to chop the text up into clusters (advanceByCombiningCharacterSequence()). Each cluster performs font fallback independently. The first font is chosen which supports every code point in the cluster (FontCascade::fontForCombiningCharacterSequence() and Font::canRenderCombiningCharacterSequence()).

Neither Arial nor sans (Helvetica) support emoji characters, so the cluster should end up causing FontCache::systemFallbackForCharacters() to be called. That's your opportunity to select the emoji font.

When investigating this, I would see which of those functions listed above is returning the wrong thing.

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