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Bug 1604357 - handle divide by zero in bezier inflection approximation range. r=aosmond

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Differential Revision: https://phabricator.services.mozilla.com/D77392
This commit is contained in:
Lee Salzman 2020-05-29 10:54:28 +00:00
parent 4b7890460b
commit f84ee8c3dc
1 changed files with 9 additions and 2 deletions
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11
gfx/2d/Path.cpp
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@ -276,11 +276,18 @@ static inline void FindInflectionApproximationRange(
if (cp21.x == 0. && cp21.y == 0.) {
// In this case s3 becomes lim[n->0] (cp41.x * n) / n - (cp41.y * n) / n =
// cp41.x - cp41.y.
double s3 = cp41.x - cp41.y;
// Use the absolute value so that Min and Max will correspond with the
// minimum and maximum of the range.
*aMin = aT - CubicRoot(std::abs(aTolerance / (cp41.x - cp41.y)));
*aMax = aT + CubicRoot(std::abs(aTolerance / (cp41.x - cp41.y)));
if (s3 == 0) {
*aMin = -1.0;
*aMax = 2.0;
} else {
double r = CubicRoot(std::abs(aTolerance / s3));
*aMin = aT - r;
*aMax = aT + r;
}
return;
}