ToxicFrog/Ligaturizer
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First pass at correcting ligature width

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This scales all copied ligatures based on the ratio between the
ligature's horizontal advance and the target font's em width, then
corrects the horizontal advance.
This commit is contained in:
Ben Kelly 2018-01-27 14:18:59 -05:00 committed by Ben Kelly
parent 434f729f15
commit b5664a696b
1 changed files with 17 additions and 0 deletions
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17
ligaturize.py
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@ -137,6 +137,22 @@ class LigatureCreator(object):
self.font.paste()
self.correct_character_width(self.font[char])
def correct_ligature_width(self, glyph):
"""Correct the horizontal advance and scale of a ligature."""
if glyph.width == self.emwidth:
return
# TODO: some kind of threshold here, similar to the character glyph
# scale threshold? The largest ligature uses 0.956 of its hbox, so if
# the target font is within 4% of the source font size, we don't need to
# resize -- but we may want to adjust the bearings. And we can't just
# center it, because ligatures are characterized by very large negative
# left bearings -- they advance 1em, but draw from (-(n-1))em to +1em.
scale = float(self.emwidth) / glyph.width
glyph.transform(psMat.scale(scale, 1.0))
glyph.width = self.emwidth
def add_ligature(self, input_chars, firacode_ligature_name):
if firacode_ligature_name is None:
# No ligature name -- we're just copying a bunch of individual characters.
@ -154,6 +170,7 @@ class LigatureCreator(object):
self.font.selection.none()
self.font.selection.select(ligature_name)
self.font.paste()
self.correct_ligature_width(self.font[ligature_name])
self.font.selection.none()
self.font.selection.select('space')