[SVG] animateMotion accumulate doesn't work properly with rotate: auto / auto-reverse

Source/core/svg/SVGAnimateMotionElement.cpp

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 219 matching lines @@
     m_toPoint = FloatPoint(m_fromPoint.x() + byPoint.x(), m_fromPoint.y() + byPoint.y());
     return true;
 }
 
 void SVGAnimateMotionElement::buildTransformForProgress(AffineTransform* transform, float percentage)
 {
     ASSERT(!m_animationPath.isEmpty());
 
     bool ok = false;
     float positionOnPath = m_animationPath.length() * percentage;
-    FloatPoint position;
-    float angle;
-    ok = m_animationPath.pointAndNormalAtLength(positionOnPath, position, angle);
+    FloatPoint position = m_animationPath.pointAtLength(positionOnPath, ok);
     if (!ok)
         return;
     transform->translate(position.x(), position.y());
-    RotateMode rotateMode = this->rotateMode();
-    if (rotateMode != RotateAuto && rotateMode != RotateAutoReverse)
-        return;
-    if (rotateMode == RotateAutoReverse)
-        angle += 180;
-    transform->rotate(angle);
 }
 
 void SVGAnimateMotionElement::calculateAnimatedValue(float percentage, unsigned repeatCount, SVGSMILElement*)
 {
     SVGElement* targetElement = this->targetElement();
     if (!targetElement)
         return;
     AffineTransform* transform = targetElement->supplementalTransform();
     if (!transform)
         return;
@@ skipping 19 matching lines @@
         return;
     }
 
     buildTransformForProgress(transform, percentage);
 
     // Handle accumulate="sum".
     if (isAccumulated() && repeatCount) {
         for (unsigned i = 0; i < repeatCount; ++i)
             buildTransformForProgress(transform, 1);
     }
+
+    bool ok = false;
+    float positionOnPath = m_animationPath.length() * percentage;
+    float angle = m_animationPath.normalAngleAtLength(positionOnPath, ok);
+    if (!ok)
+        return;
+    RotateMode rotateMode = this->rotateMode();
+    if (rotateMode != RotateAuto && rotateMode != RotateAutoReverse)
+        return;
+    if (rotateMode == RotateAutoReverse)
+        angle += 180;
+    transform->rotate(angle);
 }
 
 void SVGAnimateMotionElement::applyResultsToTarget()
 {
     // We accumulate to the target element transform list so there is not much to do here.
     SVGElement* targetElement = this->targetElement();
     if (!targetElement)
         return;
 
     if (RenderObject* renderer = targetElement->renderer())
@@ skipping 34 matching lines @@
 
 void SVGAnimateMotionElement::updateAnimationMode()
 {
     if (!m_animationPath.isEmpty())
         setAnimationMode(PathAnimation);
     else
         SVGAnimationElement::updateAnimationMode();
 }
 
 }