[SVG] Reject hit-test queries when the element has a singular transform

Source/core/rendering/svg/SVGRenderSupport.h

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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
@@ skipping 43 matching lines @@
 
     // Calculates the repaintRect in combination with filter, clipper and masker in local coordinates.
     static void intersectRepaintRectWithResources(const RenderObject*, FloatRect&);
 
     // Determines whether a container needs to be laid out because it's filtered and a child is being laid out.
     static bool filtersForceContainerLayout(RenderObject*);
 
     // Determines whether the passed point lies in a clipping area
     static bool pointInClippingArea(RenderObject*, const FloatPoint&);
 
+    // Transform |pointInParent| to |object|'s user-space and check if it is
+    // within the clipping area. Returns false if the transform is singular or
+    // the point is outside the clipping area.
+    static bool transformToUserSpaceAndCheckClipping(RenderObject*, const AffineTransform& localTransform, const FloatPoint& pointInParent, FloatPoint& localPoint);
+
     static void computeContainerBoundingBoxes(const RenderObject* container, FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, FloatRect& strokeBoundingBox, FloatRect& repaintBoundingBox);
 
     static bool paintInfoIntersectsRepaintRect(const FloatRect& localRepaintRect, const AffineTransform& localTransform, const PaintInfo&);
 
     static bool parentTransformDidChange(RenderObject*);
 
     // Important functions used by nearly all SVG renderers centralizing coordinate transformations / repaint rect calculations
     static LayoutRect clippedOverflowRectForRepaint(const RenderObject*, const RenderLayerModelObject* repaintContainer, const PaintInvalidationState*);
     static void computeFloatRectForRepaint(const RenderObject*, const RenderLayerModelObject* repaintContainer, FloatRect&, bool fixed, const PaintInvalidationState*);
     static void mapLocalToContainer(const RenderObject*, const RenderLayerModelObject* repaintContainer, TransformState&, bool* wasFixed = 0, const PaintInvalidationState* = 0);
@@ skipping 15 matching lines @@
 
 private:
     static void updateObjectBoundingBox(FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, RenderObject* other, FloatRect otherBoundingBox);
     static void invalidateResourcesOfChildren(RenderObject* start);
     static bool layoutSizeOfNearestViewportChanged(const RenderObject* start);
 };
 
 } // namespace blink
 
 #endif // SVGRenderSupport_h