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[ttGlyphPen] add 'decomposeOverflowingTransform' option

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if it's false and any transform value overflows, we raise an error instead of decomposing
This commit is contained in:
Cosimo Lupo 2018-03-01 19:39:00 +00:00
parent 4377185e29
commit acb1ebc793
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GPG Key ID: 59D54DB0C9976482
1 changed files with 5 additions and 1 deletions
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6
Lib/fontTools/pens/ttGlyphPen.py
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@ -20,8 +20,9 @@ MAX_F2DOT14 = 0x7FFF / (1 << 14)
class TTGlyphPen(AbstractPen):
"""Pen used for drawing to a TrueType glyph."""
def __init__(self, glyphSet):
def __init__(self, glyphSet, decomposeOverflowingTransform=True):
self.glyphSet = glyphSet
self.decomposeOverflowingTransform = decomposeOverflowingTransform
self.init()
def init(self):
@ -92,6 +93,9 @@ class TTGlyphPen(AbstractPen):
overflowing = any(s > 2 or s < -2
for (glyphName, transformation) in self.components
for s in transformation[:4])
if not self.decomposeOverflowingTransform and overflowing:
raise OverflowError("transform value too large to fit F2Dot14; "
"valid range is -2.0 <= x <= +2.0")
components = []
for glyphName, transformation in self.components: