Classify Beziers, use DeCasteljau for CPU renderer

[ipdf/code.git] / src / bezier.cpp

diff --git a/src/bezier.cpp b/src/bezier.cpp
index 3fa16e3..9d24672 100644 (file)
--- a/src/bezier.cpp
+++ b/src/bezier.cpp
@@ -166,8 +166,8 @@ pair<Real, Real> BezierTurningPoints(const Real & p0, const Real & p1, const Rea
        {
                return pair<Real,Real>(0, 1);
        }
-       Real a = (3*(p1-p2) + p3 - p0);
-       Real b = 2*(p2 - 2*p1 + p0);
+       Real a = ((p1-p2)*3 + p3 - p0);
+       Real b = (p2 - p1*2 + p0)*2;
        Real c = (p1-p0);
        if (a == 0)
        {
@@ -179,7 +179,7 @@ pair<Real, Real> BezierTurningPoints(const Real & p0, const Real & p1, const Rea
                return pair<Real, Real>(t, t);
        }
        //Debug("a, b, c are %f, %f, %f", Float(a), Float(b), Float(c));
-       if (b*b - 4*a*c < 0)
+       if (b*b - a*c*4 < 0)
        {
                //Debug("No real roots");
                return pair<Real, Real>(0,1);