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make drop_implied_oncurves work with multiple interpolatable glyphs

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This commit is contained in:
Cosimo Lupo 2023-05-23 18:20:58 +01:00
parent 02a063685f
commit a73abc6b87
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GPG Key ID: DF65A8A5A119C9A8
1 changed files with 45 additions and 36 deletions
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15
Lib/fontTools/pens/ttGlyphPen.py
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@ -17,8 +17,10 @@ import math
__all__ = ["TTGlyphPen", "TTGlyphPointPen"]
def drop_implied_oncurves(glyph):
drop = set()
def drop_implied_oncurves(*interpolatable_glyphs):
drop = None
for glyph in interpolatable_glyphs:
may_drop = set()
start = 0
flags = glyph.flags
coords = glyph.coordinates
@ -38,9 +40,16 @@ def drop_implied_oncurves(glyph):
):
continue
drop.add(i)
may_drop.add(i)
# we only want to drop if ALL interpolatable glyphs have the same implied oncurves
if drop is None:
drop = may_drop
else:
drop.intersection_update(may_drop)
if drop:
# Do the actual dropping
for glyph in interpolatable_glyphs:
glyph.coordinates = GlyphCoordinates(
coords[i] for i in range(len(coords)) if i not in drop
)