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[transform] Change the DecomposedTransform skewX sign to match Transform

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Unfortunate but for consistency's sake.

This deviates from VarComposite convention.

https://github.com/fonttools/fonttools/pull/2958#issuecomment-1416155600
This commit is contained in:
Behdad Esfahbod 2023-02-03 10:23:23 -07:00
parent c0d100f7e8
commit 8e981a1b28
2 changed files with 6 additions and 6 deletions
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6
Lib/fontTools/misc/transform.py
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@ -418,7 +418,7 @@ class DecomposedTransform:
rotation: float = 0 # in degrees, counter-clockwise
scaleX: float = 1
scaleY: float = 1
skewX: float = 0 # in degrees, counter-clockwise
skewX: float = 0 # in degrees, clockwise
skewY: float = 0 # in degrees, counter-clockwise
tCenterX: float = 0
tCenterY: float = 0
@ -455,7 +455,7 @@ class DecomposedTransform:
math.degrees(rotation),
scaleX,
scaleY,
-math.degrees(skewX),
math.degrees(skewX),
math.degrees(skewY),
0,
0,
@ -475,7 +475,7 @@ class DecomposedTransform:
)
t = t.rotate(math.radians(self.rotation))
t = t.scale(self.scaleX, self.scaleY)
t = t.skew(-math.radians(self.skewX), math.radians(self.skewY))
t = t.skew(math.radians(self.skewX), math.radians(self.skewY))
t = t.translate(-self.tCenterX, -self.tCenterY)
return t

6
Lib/fontTools/ttLib/tables/_g_l_y_f.py
View File

@ -1734,7 +1734,7 @@ VAR_COMPONENT_TRANSFORM_MAPPING = {
VarComponentFlags.HAVE_SCALE_Y, 10, 1, 1
),
"skewX": VarComponentTransformMappingValues(
VarComponentFlags.HAVE_SKEW_X, 12, 180, 0
VarComponentFlags.HAVE_SKEW_X, 12, -180, 0
),
"skewY": VarComponentTransformMappingValues(
VarComponentFlags.HAVE_SKEW_Y, 12, 180, 0
@ -1988,7 +1988,7 @@ class GlyphVarComponent(object):
controls.append("skew")
coords.append(
(
fl2fi(self.transform.skewX / 180, 12),
fl2fi(self.transform.skewX / -180, 12),
fl2fi(self.transform.skewY / 180, 12),
)
)
@ -2027,7 +2027,7 @@ class GlyphVarComponent(object):
i += 1
if self.flags & (VarComponentFlags.HAVE_SKEW_X | VarComponentFlags.HAVE_SKEW_Y):
self.transform.skewX, self.transform.skewY = (
fi2fl(coords[i][0], 12) * 180,
fi2fl(coords[i][0], 12) * -180,
fi2fl(coords[i][1], 12) * 180,
)
i += 1