hhea

com.google.fonts/check/caret_slope

Check hhea.caretSlopeRise and hhea.caretSlopeRun

Rationale:

Checks whether hhea.caretSlopeRise and hhea.caretSlopeRun match with post.italicAngle.

For Upright fonts, you can set hhea.caretSlopeRise to 1 and hhea.caretSlopeRun to 0.

For Italic fonts, you can set hhea.caretSlopeRise to head.unitsPerEm and calculate hhea.caretSlopeRun like this: round(math.tan(

math.radians(-1 * font[“post”].italicAngle)) * font[“head”].unitsPerEm)

This check allows for a 0.1° rounding difference between the Italic angle as calculated by the caret slope and post.italicAngle

• Originally proposed at https://github.com/fonttools/fontbakery/issues/3670

com.google.fonts/check/maxadvancewidth

MaxAdvanceWidth is consistent with values in the Hmtx and Hhea tables?

Legacy check originally simply called ‘check/073’. We used to lack richer metadata back in 2015. We’re open to further improvements to this description.