os2_metrics_match_hhea

Checking OS/2 Metrics match hhea Metrics.

os2_metrics_match_hhea

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

Rationale

OS/2 and hhea vertical metric values should match. This will produce the same linespacing on Mac, GNU+Linux and Windows.

• Mac OS X uses the hhea values.
• Windows uses OS/2 or Win, depending on the OS or fsSelection bit value.

When OS/2 and hhea vertical metrics match, the same linespacing results on macOS, GNU+Linux and Windows. Note that fixing this issue in a previously released font may cause reflow in user documents and unhappy users.

Proposal

• https://github.com/fonttools/fontbakery/issues/4829

Profiles

• universal (in section 'Universal Profile Checks')

• googlefonts (in section 'Universal Profile Checks')