def AddGlyphVariations(font, thin, regular, black):
assert "gvar" not in font
gvar = font["gvar"] = table__g_v_a_r()
gvar.version = 1
gvar.reserved = 0
gvar.variations = {}
for glyphName in regular.getGlyphOrder():
regularCoord = GetCoordinates(regular, glyphName)
thinCoord = GetCoordinates(thin, glyphName)
blackCoord = GetCoordinates(black, glyphName)
if not regularCoord or not blackCoord or not thinCoord:
logging.warning("glyph %s not present in all input fonts",
glyphName)
continue
if (len(regularCoord) != len(blackCoord) or
len(regularCoord) != len(thinCoord)):
logging.warning("glyph %s has not the same number of "
"control points in all input fonts", glyphName)
continue
thinDelta = []
blackDelta = []
for ((regX, regY), (blackX, blackY), (thinX, thinY)) in \
zip(regularCoord, blackCoord, thinCoord):
thinDelta.append(((thinX - regX, thinY - regY)))
blackDelta.append((blackX - regX, blackY - regY))
thinVar = TupleVariation({"wght": (-1.0, -1.0, 0.0)}, thinDelta)
blackVar = TupleVariation({"wght": (0.0, 1.0, 1.0)}, blackDelta)
gvar.variations[glyphName] = [thinVar, blackVar]
def _add_gvar(font, model, master_ttfs, tolerance=.5):
log.info("Generating gvar")
assert "gvar" not in font
gvar = font["gvar"] = newTable('gvar')
gvar.version = 1
gvar.reserved = 0
gvar.variations = {}
for glyph in font.getGlyphOrder():
allData = [_GetCoordinates(m, glyph) for m in master_ttfs]
allCoords = [d[0] for d in allData]
allControls = [d[1] for d in allData]
control = allControls[0]
if (any(c != control for c in allControls)):
warnings.warn("glyph %s has incompatible masters; skipping" %
glyph)
continue
del allControls
# Update gvar
gvar.variations[glyph] = []
deltas = model.getDeltas(allCoords)
supports = model.supports
assert len(deltas) == len(supports)
for i, (delta, support) in enumerate(zip(deltas[1:], supports[1:])):
if not delta:
continue
if tolerance and max(abs(delta).array) <= tolerance:
continue
var = TupleVariation(support, delta)
gvar.variations[glyph].append(var)