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[perimeterPen] 5x speed-up cubic by using complex numbers as points

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This commit is contained in:
Behdad Esfahbod 2016-10-29 16:48:21 +02:00
parent c5538eaccf
commit a71faf9322
1 changed files with 12 additions and 5 deletions
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17
Lib/fontTools/pens/perimeterPen.py
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@ -16,6 +16,12 @@ def _intSecAtan(x):
# Out: x*sqrt(x**2 + 1)/2 + asinh(x)/2
return x * math.sqrt(x**2 + 1)/2 + math.asinh(x)/2
def _split_cubic_into_two(p0, p1, p2, p3):
mid = (p0 + 3 * (p1 + p2) + p3) * .125
deriv3 = (p3 + p2 - p1 - p0) * .125
return ((p0, (p0 + p1) * .5, mid - deriv3, mid),
(mid, mid + deriv3, (p2 + p3) * .5, p3))
class PerimeterPen(BasePen):
def __init__(self, glyphset=None, tolerance=0.005):
@ -55,17 +61,18 @@ class PerimeterPen(BasePen):
self.value += Len
def _addCubic(self, p0, p1, p2, p3):
arch = _distance(p0, p3)
box = _distance(p0, p1) + _distance(p1, p2) + _distance(p2, p3)
arch = abs(p0-p3)
box = abs(p0-p1) + abs(p1-p2) + abs(p2-p3)
if arch * self._mult >= box:
self.value += (arch + box) * .5
else:
for c in splitCubicAtT(p0,p1,p2,p3,.2,.4,.6,.8):
self._addCubic(*c)
one,two = _split_cubic_into_two(p0,p1,p2,p3)
self._addCubic(*one)
self._addCubic(*two)
def _curveToOne(self, p1, p2, p3):
p0 = self._getCurrentPoint()
self._addCubic(p0, p1, p2, p3)
self._addCubic(complex(*p0), complex(*p1), complex(*p2), complex(*p3))
def _closePath(self):
p0 = self._getCurrentPoint()