2 files changed, 12 insertions, 3 deletions
diff --git a/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp b/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp
index a3c8266..a5a743f 100644
--- a/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp
+++ b/src/opengl/gl2paintengineex/qtriangulatingstroker.cpp
@@ -130,8 +130,8 @@ void QTriangulatingStroker::process(const QVectorPath &path, const QPen &pen)
     if (m_roundness > 24)
         m_roundness = 24;
 
-    m_sin_theta = qSin(Q_PI / m_roundness); // ### Use qFastSin
-    m_cos_theta = qCos(Q_PI / m_roundness);
+    m_sin_theta = qFastSin(Q_PI / m_roundness);
+    m_cos_theta = qFastCos(Q_PI / m_roundness);
 
     const qreal *endPts = pts + (count<<1);
     const qreal *startPts;
diff --git a/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h b/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h
index b7354db..ae56e87 100644
--- a/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h
+++ b/src/opengl/gl2paintengineex/qtriangulatingstroker_p.h
@@ -124,7 +124,16 @@ inline void QTriangulatingStroker::normalVector(float x1, float y1, float x2, fl
 {
     float dx = x2 - x1;
     float dy = y2 - y1;
-    float pw = m_width / sqrt(dx*dx + dy*dy);
+
+    float pw;
+
+    if (dx == 0)
+        pw = m_width / dy;
+    else if (dy == 0)
+        pw = m_width / dx;
+    else
+        pw = m_width / sqrt(dx*dx + dy*dy);
+
     *nx = -dy * pw;
     *ny = dx * pw;
 }