cmap__format_12

Check that format 12 cmap subtables are correctly constituted.

cmap/format_12

• Applies to: TTF
• Fontspector can hotfix?: no
• Fontspector can fix sources?: no

Rationale

If a format 12 cmap table is used to address codepoints beyond the BMP, it should actually contain such codepoints. Additionally, it should also contain all characters mapped in the format 4 subtable.

Proposal

• https://github.com/fonttools/fontbakery/pull/3681

Profiles

• universal (in section 'Universal Profile Checks')

• googlefonts (in section 'Universal Profile Checks')