[RAL] Reduce SVG tree walks

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 54 matching lines @@
     static bool filtersForceContainerLayout(RenderObject*);
 
     // Determines whether the passed point lies in a clipping area
     static bool pointInClippingArea(RenderObject*, const FloatPoint&);
 
     template <typename RenderObjectType>
     static void computeContainerBoundingBoxes(const RenderObjectType* container, FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, FloatRect& strokeBoundingBox, FloatRect& repaintBoundingBox);
 
     static bool paintInfoIntersectsRepaintRect(const FloatRect& localRepaintRect, const AffineTransform& localTransform, const PaintInfo&);
 
+    static bool parentTransformDidChange(RenderObject*);

[leviw_travelin_and_unemployed, 2014/06/10 23:32:26]

Why RenderObject and not RenderSVGModelObject? I guess it's consistent with the
rest of the code, it's just weird to me.

[pdr., 2014/06/11 03:09:24]

Sometimes svg..
https://docs.google.com/a/chromium.org/drawings/d/1nayJX5XcclYj_-blbVuakVNjVW...

+
     // Important functions used by nearly all SVG renderers centralizing coordinate transformations / repaint rect calculations
     static LayoutRect clippedOverflowRectForRepaint(const RenderObject*, const RenderLayerModelObject* repaintContainer);
     static void computeFloatRectForRepaint(const RenderObject*, const RenderLayerModelObject* repaintContainer, FloatRect&, bool fixed);
     static void mapLocalToContainer(const RenderObject*, const RenderLayerModelObject* repaintContainer, TransformState&, bool* wasFixed = 0);
     static const RenderObject* pushMappingToContainer(const RenderObject*, const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&);
     static bool checkForSVGRepaintDuringLayout(RenderObject*);
 
     // Shared between SVG renderers and resources.
     static void applyStrokeStyleToContext(GraphicsContext*, const RenderStyle*, const RenderObject*);
     static void applyStrokeStyleToStrokeData(StrokeData*, const RenderStyle*, const RenderObject*);
@@ skipping 141 matching lines @@
     ASSERT(start->isSVGRoot() || start->isSVGViewportContainer());
     if (start->isSVGViewportContainer())
         return toRenderSVGViewportContainer(start)->isLayoutSizeChanged();
 
     return toRenderSVGRoot(start)->isLayoutSizeChanged();
 }
 
 } // namespace WebCore
 
 #endif // SVGRenderSupport_h