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ot-spec says skewX angle should be counter-clockwise so we must negate

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Transform.skew method assumes skewX angle goes clockwise.

verified using test_glyphs-glyf_colr_1.ttf test font from googlefonts/color-fonts repo.
Will add that to the tests.
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Cosimo Lupo 2023-03-10 12:35:52 +00:00
parent 55cc41a24e
commit c15e77cbc9
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1 changed files with 2 additions and 2 deletions
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4
Lib/fontTools/ttLib/tables/otTables.py
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@ -1667,11 +1667,11 @@ class Paint(getFormatSwitchingBaseTableClass("uint8")):
.translate(-self.centerX, -self.centerY)
)
elif self.Format == PaintFormat.PaintSkew:
return Identity.skew(radians(self.xSkewAngle), radians(self.ySkewAngle))
return Identity.skew(radians(-self.xSkewAngle), radians(self.ySkewAngle))
elif self.Format == PaintFormat.PaintSkewAroundCenter:
return (
Identity.translate(self.centerX, self.centerY)
.skew(radians(self.xSkewAngle), radians(self.ySkewAngle))
.skew(radians(-self.xSkewAngle), radians(self.ySkewAngle))
.translate(-self.centerX, -self.centerY)
)
if PaintFormat(self.Format).is_variable():