https://bugzilla.redhat.com/show_bug.cgi?id=2389100
Bug ID: 2389100
Summary: U+FE0E (text-style selector) ignored when COLRv1 emoji
fonts are present
Product: Fedora
Version: 43
URL: https://gitlab.gnome.org/GNOME/pango/-/issues/866
OS: Linux
Status: NEW
Component: pango
Keywords: Desktop, i18n
Severity: medium
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected],
[email protected],
[email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected]
Target Milestone: ---
Classification: Fedora
See: U+FE0E (text-style selector) ignored when COLRv1 emoji fonts are present
When a COLRv1 emoji font (e.g., Noto-COLRv1.ttf) is installed, the Unicode
variation selector U+FE0E (text-style) is ignored, and emoji are always
rendered in color. This breaks expected behavior, as U+FE0E should force
monochrome rendering.
Steps to reproduce:
On a system with Noto-COLRv1.ttf (e.g., Fedora Rawhide), run:
pango-view --font="sans" test.txt
with the test.txt attached here: test.txt (this file contains: 🚀 🚀︎ (U+1F680
U+1F680 U+FE0E))
Expected output shown by pango-view: One colored rocket, one monochrome rocket.
Actual output: two colored rockets.
If one tries the same on Fedora 42 with default fonts installed, i.e. no font
with a COLR table, it works as expected.
/usr/share/fonts/google-noto-color-emoji-fonts/Noto-COLRv1.ttf does not have
U+FE0E according to fontconfig:
mfabian@f42:~
$ fc-list :charset=1f680,fe0e
/usr/share/fonts/gdouros-symbola/Symbola.ttf: Symbola:style=Regular
/usr/share/fonts/google-noto-emoji-fonts/NotoEmoji-Regular.ttf: Noto
Emoji:style=Regular
mfabian@f42:~
$ fc-list :charset=1f680
/usr/share/fonts/twemoji/Twemoji.ttf: Twemoji:style=Regular
/usr/share/fonts/google-noto-color-emoji-fonts/NotoColorEmoji.ttf: Noto Color
Emoji:style=Regular
/usr/share/fonts/hfg-gmuend-openmoji-black-fonts/OpenMoji-black-glyf.ttf:
OpenMoji Black,OpenMoji Black:style=Regular,Regular
/usr/share/fonts/gdouros-symbola/Symbola.ttf: Symbola:style=Regular
/usr/share/fonts/google-noto-emoji-fonts/NotoEmoji-Regular.ttf: Noto
Emoji:style=Regular
/usr/share/fonts/hfg-gmuend-openmoji-color-fonts/OpenMoji-color-glyf_colr_1.ttf:
OpenMoji Color,OpenMoji Color:style=Regular,
Regular
mfabian@f42:~
$
and it is not used to render U+1F680 U+FE0E, instead
/usr/share/fonts/google-noto-emoji-fonts/NotoEmoji-Regular.ttf is used which
has both U+1F680 and U+FE0E.
Reproducible: Always
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