Add support for SVG Clip paths in HTML

Source/core/rendering/RenderLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 31 matching lines @@
  * version of this file under any of the LGPL, the MPL or the GPL.
  */
 
 #ifndef RenderLayer_h
 #define RenderLayer_h
 
 #include "core/rendering/LayerFragment.h"
 #include "core/rendering/LayerPaintingInfo.h"
 #include "core/rendering/RenderBox.h"
 #include "core/rendering/RenderLayerBlendInfo.h"
+#include "core/rendering/RenderLayerClipPathInfo.h"
 #include "core/rendering/RenderLayerClipper.h"
 #include "core/rendering/RenderLayerFilterInfo.h"
 #include "core/rendering/RenderLayerReflectionInfo.h"
 #include "core/rendering/RenderLayerRepainter.h"
 #include "core/rendering/RenderLayerScrollableArea.h"
 #include "core/rendering/RenderLayerStackingNode.h"
 #include "core/rendering/RenderLayerStackingNodeIterator.h"
 #include "core/rendering/compositing/CompositedLayerMappingPtr.h"
 #include "platform/graphics/CompositingReasons.h"
 #include "wtf/OwnPtr.h"
@@ skipping 233 matching lines @@
     // Returns true if the layer has a -webkit-perspective.
     // Note that this transform has the perspective-origin baked in.
     TransformationMatrix perspectiveTransform() const;
     FloatPoint perspectiveOrigin() const;
     bool preserves3D() const { return renderer()->style()->transformStyle3D() == TransformStyle3DPreserve3D; }
     bool has3DTransform() const { return m_transform && !m_transform->isAffine(); }
 
     // FIXME: reflections should force transform-style to be flat in the style: https://bugs.webkit.org/show_bug.cgi?id=106959
     bool shouldPreserve3D() const { return !renderer()->hasReflection() && renderer()->style()->transformStyle3D() == TransformStyle3DPreserve3D; }
 
-    void filterNeedsPaintInvalidation();
+    void SVGEffectsNeedsPaintInvalidation();

[pdr., 2014/08/04 17:06:32]

We should use "svgEffectsNeedPaintInvalidation" (lowercase 'svg' and just a
singular need)

[f(malita), 2014/08/05 14:13:07]

+1.

[Shanmuga Pandi, 2014/08/06 14:51:34]

Done.

     bool hasFilter() const { return renderer()->hasFilter(); }
 
     bool paintsWithBlendMode() const;
 
     void* operator new(size_t);
     // Only safe to call from RenderLayerModelObject::destroyLayer()
     void operator delete(void*);
 
     CompositingState compositingState() const;
 
@@ skipping 320 matching lines @@
     bool childBackgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const;
 
     bool shouldBeSelfPaintingLayer() const;
 
     // FIXME: We should only create the stacking node if needed.
     bool requiresStackingNode() const { return true; }
     void updateStackingNode();
 
     void updateReflectionInfo(const RenderStyle*);
 
+    void updateClipPathInfo(const RenderStyle* oldStyle, const RenderStyle* newStyle);
+
     // FIXME: We could lazily allocate our ScrollableArea based on style properties ('overflow', ...)
     // but for now, we are always allocating it for RenderBox as it's safer.
     bool requiresScrollableArea() const { return renderBox(); }
     void updateScrollableArea();
 
     void dirtyAncestorChainVisibleDescendantStatus();
     void setAncestorChainHasVisibleDescendant();
 
     bool attemptDirectCompositingUpdate(StyleDifference, const RenderStyle* oldStyle);
     void updateTransform(const RenderStyle* oldStyle, RenderStyle* newStyle);
@@ skipping 107 matching lines @@
 
     OwnPtr<CompositedLayerMapping> m_compositedLayerMapping;
     OwnPtr<RenderLayerScrollableArea> m_scrollableArea;
 
     CompositedLayerMapping* m_groupedMapping;
 
     RenderLayerRepainter m_repainter;
     RenderLayerClipper m_clipper; // FIXME: Lazily allocate?
     OwnPtr<RenderLayerStackingNode> m_stackingNode;
     OwnPtr<RenderLayerReflectionInfo> m_reflectionInfo;
+    OwnPtr<RenderLayerClipPathInfo> m_clipPathInfo;

[f(malita), 2014/08/05 14:13:08]

This increases the size of all RenderLayers, but very few of them actually get a
clip path. I think using a static map just like RenderLayerFilterInfo would make
more sense.

[Shanmuga Pandi, 2014/08/06 14:51:34]

Initially I tried that way (Patch set1). But I thought static map is not needed
and like copy-pasta , so removed the unnecessary code and followed like
m_reflectionInfo.

     RenderLayerBlendInfo m_blendInfo;
 
     LayoutSize m_subpixelAccumulation; // The accumulated subpixel offset of a composited layer's composited bounds compared to absolute coordinates.
 };
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const blink::RenderLayer*);
 void showLayerTree(const blink::RenderObject*);
 #endif
 
 #endif // RenderLayer_h