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[VarComposite] Fix skew

This commit is contained in:
Behdad Esfahbod 2023-01-25 14:35:35 -07:00
parent 626f8e4de3
commit 8cf7076309
1 changed files with 2 additions and 1 deletions
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3
src/OT/glyf/VarCompositeGlyph.hh
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@ -156,9 +156,10 @@ struct VarCompositeGlyphRecord
float skewX, float skewY)
{
// https://github.com/fonttools/fonttools/blob/f66ee05f71c8b57b5f519ee975e95edcd1466e14/Lib/fontTools/misc/transform.py#L255
// We need a sign difference compared to fonttools
skewX = skewX * float (M_PI);
skewY = skewY * float (M_PI);
float other[6] = {1.f, tanf (skewY), tanf (skewX), 1.f, 0.f, 0.f};
float other[6] = {1.f, tanf (skewY), -tanf (skewX), 1.f, 0.f, 0.f};
transform (matrix, trans, other);
}