patch fonttools instead of ufo2ft

init.sh

@@ -121,13 +121,14 @@ else
     date '+%s' > "$UPDATE_TIMESTAMP_FILE"
   fi
 
-  # patch ufo2ft [BUG #110]
-  P1_FILE="$VENV_DIR/lib/python/site-packages/ufo2ft/outlineCompiler.py"
+  # patch fonttools [BUG #110]
+  P1_FILE="$VENV_DIR/lib/python/site-packages/fontTools/misc/psCharStrings.py"
   P1_BACKUP="$P1_FILE.orig"
   if [[ ! -f "$P1_BACKUP" ]]; then
     echo "Patching $P1_FILE (backup at $P1_BACKUP)"
     mv "$P1_FILE" "$P1_BACKUP"
-    patch "$P1_BACKUP" -o "$P1_FILE" -u -i misc/ufo2ft-2.5.0-outlineCompiler.patch
+    patch "$P1_BACKUP" -o "$P1_FILE" -u -i \
+      misc/fonttools-3.34.2-psCharStrings.patch
   fi
 
 

misc/fontbuild

@@ -198,15 +198,13 @@ def setFontInfo(font, weight):
   family = font.info.familyName  # i.e. "Inter UI"
   style = font.info.styleName    # e.g. "Medium Italic"
 
-  # Patch italicAngle to be either positive zero or single-decimal precision
-  # floating-point number.
-  # This value can go wrong since we are using floating-point numbers.
+  # Update italicAngle
   isitalic = False
   if font.info.italicAngle != 0:
     isitalic = True
-    font.info.italicAngle = round(font.info.italicAngle, 1)
+    font.info.italicAngle = float('%.8g' % font.info.italicAngle)
   else:
-    font.info.italicAngle = 0
+    font.info.italicAngle = 0  # avoid "-0.0" value in UFO
 
   # weight
   font.info.openTypeOS2WeightClass = weight

misc/fonttools-3.34.2-psCharStrings.patch

@@ -0,0 +1,37 @@
+--- a/fontTools/misc/psCharStrings.py
++++ b/fontTools/misc/psCharStrings.py
+@@ -223,9 +223,16 @@
+ 	else:
+ 		return b"\xff" + pack(">l", value)  # encode the entire fixed point value
+ 
++
++realZeroBytes = bytechr(30) + bytechr(0xf)
++
+ def encodeFloat(f):
+ 	# For CFF only, used in cffLib
+-	s = str(f).upper()
++	if f == 0.0: # 0.0 == +0.0 == -0.0
++		return realZeroBytes
++	# Note: 14 decimal digits seems to be the limitation for CFF real numbers
++	# in macOS. However, we use 8 here to match the implementation of AFDKO.
++	s = "%.8G" % f
+ 	if s[:2] == "0.":
+ 		s = s[1:]
+ 	elif s[:3] == "-0.":
+@@ -234,9 +241,13 @@
+ 	while s:
+ 		c = s[0]
+ 		s = s[1:]
+-		if c == "E" and s[:1] == "-":
+-			s = s[1:]
+-			c = "E-"
++		if c == "E":
++			c2 = s[:1]
++			if c2 == "-":
++				s = s[1:]
++				c = "E-"
++			elif c2 == "+":
++				s = s[1:]
+ 		nibbles.append(realNibblesDict[c])
+ 	nibbles.append(0xf)
+ 	if len(nibbles) % 2:

misc/ufo2ft-2.5.0-outlineCompiler.patch

@@ -1,18 +0,0 @@
---- a/ufo2ft/outlineCompiler.py
-+++ b/ufo2ft/outlineCompiler.py
-@@ -983,7 +983,14 @@
-         topDict.UnderlineThickness = otRound(underlineThickness)
-         # populate font matrix
-         unitsPerEm = otRound(getAttrWithFallback(info, "unitsPerEm"))
--        topDict.FontMatrix = [1.0 / unitsPerEm, 0, 0, 1.0 / unitsPerEm, 0, 0]
-+        topDict.FontMatrix = [
-+            round(1.0 / unitsPerEm, 14),
-+            0,
-+            0,
-+            round(1.0 / unitsPerEm, 14),
-+            0,
-+            0
-+        ]
-         # populate the width values
-         if not any(hasattr(info, attr) and getattr(info, attr) is not None
-                    for attr in ("postscriptDefaultWidthX",

requirements.txt

@@ -1,5 +1,6 @@
 glyphsLib==3.1.4
 skia-pathops==0.2.0.post2
+fonttools[ufo,lxml,unicode]==3.34.2
 fontmake==1.8.0
 fs==2.2.0