Avoid negative hmtx values when creating font from variable font

Fix #2821.
2022-09-20 16:27:54 +02:00 · 2022-09-20 16:27:54 +02:00 · fd0e81ad13
commit fd0e81ad13
parent 995e5e254d
1 changed files with 1 additions and 1 deletions
--- a/Lib/fontTools/varLib/mutator.py
+++ b/Lib/fontTools/varLib/mutator.py
@ -143,7 +143,7 @@ def interpolate_cff2_metrics(varfont, topDict, glyphOrder, loc):

 		if lsb_delta or width_delta:
 			if width_delta:
-				entry[0] += width_delta
+				entry[0] = max(0, entry[0] + width_delta)
 			if lsb_delta:
 				entry[1] = lsb
 			hmtx[gname] = tuple(entry)