Fix pointer-events:all when stroke="none"

Source/core/layout/svg/LayoutSVGPath.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2005, 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) 2011 Renata Hodovan <reni@webkit.org>
  * Copyright (C) 2011 University of Szeged
@@ skipping 16 matching lines @@
 
 #include "config.h"
 
 #include "core/layout/svg/LayoutSVGPath.h"
 
 #include "core/layout/svg/LayoutSVGResourceMarker.h"
 #include "core/layout/svg/SVGResources.h"
 #include "core/layout/svg/SVGResourcesCache.h"
 #include "core/layout/svg/SVGSubpathData.h"
 #include "core/svg/SVGGraphicsElement.h"
+#include "wtf/MathExtras.h"
 
 namespace blink {
 
 LayoutSVGPath::LayoutSVGPath(SVGGraphicsElement* node)
     : LayoutSVGShape(node)
 {
 }
 
 LayoutSVGPath::~LayoutSVGPath()
 {
 }
 
 void LayoutSVGPath::updateShapeFromElement()
 {
     LayoutSVGShape::updateShapeFromElement();
     processMarkerPositions();
     updateZeroLengthSubpaths();
 
     m_strokeBoundingBox = calculateUpdatedStrokeBoundingBox();
 }
 
+FloatRect LayoutSVGPath::hitTestStrokeBoundingBox() const
+{
+    const SVGComputedStyle& svgStyle = style()->svgStyle();
+    if (svgStyle.hasStroke())
+        return m_strokeBoundingBox;
+
+    // Implementation of http://dev.w3.org/fxtf/css-masking-1/#compute-stroke-bounding-box
+    // except that we ignore whether the stroke is none.
+
+    FloatRect box = m_fillBoundingBox;
+
+    const float strokeWidth = this->strokeWidth();
+    if (strokeWidth <= 0)
+        return box;
+
+    float delta = strokeWidth / 2;
+
+    if (svgStyle.hasMiterJoinStyle()) {
+        const float miter = svgStyle.strokeMiterLimit();
+        if (miter < M_SQRT2 && svgStyle.hasSquareCapStyle())
+            delta *= M_SQRT2;
+        else
+            delta *= miter;
+    } else if (svgStyle.hasSquareCapStyle()) {
+        delta *= M_SQRT2;
+    }
+
+    box.inflate(delta);
+
+    for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i)
+        box.unite(zeroLengthSubpathRect(m_zeroLengthLinecapLocations[i], strokeWidth));
+
+    return box;
+}
+
 FloatRect LayoutSVGPath::calculateUpdatedStrokeBoundingBox() const
 {
     FloatRect strokeBoundingBox = m_strokeBoundingBox;
 
     if (!m_markerPositions.isEmpty())
         strokeBoundingBox.unite(markerRect(strokeWidth()));
 
     if (style()->svgStyle().hasStroke()) {
         // FIXME: zero-length subpaths do not respect vector-effect = non-scaling-stroke.
         float strokeWidth = this->strokeWidth();
         for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i)
             strokeBoundingBox.unite(zeroLengthSubpathRect(m_zeroLengthLinecapLocations[i], strokeWidth));
     }
 
     return strokeBoundingBox;
 }
 
 bool LayoutSVGPath::shapeDependentStrokeContains(const FloatPoint& point)
 {
     if (LayoutSVGShape::shapeDependentStrokeContains(point))
         return true;
 
     const SVGComputedStyle& svgStyle = style()->svgStyle();
+    const float strokeWidth = this->strokeWidth();
     for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i) {
         ASSERT(svgStyle.hasStroke());
-        float strokeWidth = this->strokeWidth();
         if (svgStyle.capStyle() == SquareCap) {
             if (zeroLengthSubpathRect(m_zeroLengthLinecapLocations[i], strokeWidth).contains(point))
                 return true;
         } else {
             ASSERT(svgStyle.capStyle() == RoundCap);
             FloatPoint radiusVector(point.x() - m_zeroLengthLinecapLocations[i].x(), point.y() -  m_zeroLengthLinecapLocations[i].y());
             if (radiusVector.lengthSquared() < strokeWidth * strokeWidth * .25f)
                 return true;
         }
     }
@@ skipping 71 matching lines @@
     ASSERT(resources);
 
     LayoutSVGResourceMarker* markerStart = resources->markerStart();
 
     SVGMarkerData markerData(m_markerPositions, markerStart ? markerStart->orientType() == SVGMarkerOrientAutoStartReverse : false);
     path().apply(&markerData, SVGMarkerData::updateFromPathElement);
     markerData.pathIsDone();
 }
 
 }