From 9035b78ef8b8ebfdd7d43fc0b9c3071253eb0d56 Mon Sep 17 00:00:00 2001
From: Yoann Lopes <yoann.lopes@nokia.com>
Date: Tue, 21 Sep 2010 14:06:59 +0200
Subject: Fixes bezier curves not being drawn when it is a line.

Some old work-around code is no longer needed...

Task-number: QTBUG-13721
Reviewed-by: Samuel
---
 src/gui/painting/qbezier.cpp | 41 -----------------------------------------
 1 file changed, 41 deletions(-)

diff --git a/src/gui/painting/qbezier.cpp b/src/gui/painting/qbezier.cpp
index 2a9b31a..54c81ba 100644
--- a/src/gui/painting/qbezier.cpp
+++ b/src/gui/painting/qbezier.cpp
@@ -293,36 +293,6 @@ static ShiftResult good_offset(const QBezier *b1, const QBezier *b2, qreal offse
     return Ok;
 }
 
-static inline QLineF qline_shifted(const QPointF &p1, const QPointF &p2, qreal offset)
-{
-    QLineF l(p1, p2);
-    QLineF ln = l.normalVector().unitVector();
-    l.translate(ln.dx() * offset, ln.dy() * offset);
-    return l;
-}
-
-static bool qbezier_is_line(QPointF *points, int pointCount)
-{
-    Q_ASSERT(pointCount > 2);
-
-    qreal dx13 = points[2].x() - points[0].x();
-    qreal dy13 = points[2].y() - points[0].y();
-
-    qreal dx12 = points[1].x() - points[0].x();
-    qreal dy12 = points[1].y() - points[0].y();
-
-    if (pointCount == 3) {
-        return qFuzzyCompare(dx12 * dy13, dx13 * dy12);
-    } else if (pointCount == 4) {
-        qreal dx14 = points[3].x() - points[0].x();
-        qreal dy14 = points[3].y() - points[0].y();
-
-        return (qFuzzyCompare(dx12 * dy13, dx13 * dy12) && qFuzzyCompare(dx12 * dy14, dx14 * dy12));
-    }
-
-    return false;
-}
-
 static ShiftResult shift(const QBezier *orig, QBezier *shifted, qreal offset, qreal threshold)
 {
     int map[4];
@@ -353,17 +323,6 @@ static ShiftResult shift(const QBezier *orig, QBezier *shifted, qreal offset, qr
     if (np == 1)
         return Discard;
 
-    // We need to specialcase lines of 3 or 4 points due to numerical
-    // instability in intersections below
-    if (np > 2 && qbezier_is_line(points, np)) {
-        if (points[0] == points[np-1])
-            return Discard;
-
-        QLineF l = qline_shifted(points[0], points[np-1], offset);
-        *shifted = QBezier::fromPoints(l.p1(), l.pointAt(qreal(0.33)), l.pointAt(qreal(0.66)), l.p2());
-        return Ok;
-    }
-
     QRectF b = orig->bounds();
     if (np == 4 && b.width() < .1*offset && b.height() < .1*offset) {
         qreal l = (orig->x1 - orig->x2)*(orig->x1 - orig->x2) +
-- 
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