Bug 259205

Summary:	[Harfbuzz] Glyphs need to be classified as either color or non-color
Product:	WebKit	Reporter:	Myles C. Maxfield <mmaxfield>
Component:	Text	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	cgarcia, mmaxfield, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=259139

Description Myles C. Maxfield 2023-07-13 22:06:08 PDT

See https://webkit.slack.com/archives/CU65R5WQY/p1689189611828469.

In order to handle emoji properly, we need to know whether or not a glyph is a color glyph. Harfbuzz has functions for this (`hb_ot_color_has_paint()`, `hb_ot_color_has_png()`, `hb_ot_color_has_svg()`, etc.) but the only time Harfbuzz fonts exist in WebKit is inside ComplexTextController. There doesn't seem to be a place where I can call these functions outside of ComplexTextController.

Comment 1 Radar WebKit Bug Importer 2023-07-20 22:07:17 PDT

<rdar://problem/112640305>