Fix sub-pixel handling of transparency layers

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 121 matching lines @@
     bool isSelfPaintingLayer() const { return m_isSelfPaintingLayer; }
     bool isOverflowOnlyLayer() const { return m_layerType == OverflowClipLayer; }
     bool isForcedLayer() const { return m_layerType == ForcedLayer; }
 
     void setLayerType(LayerType layerType) { m_layerType = layerType; }
 
     bool cannotBlitToWindow() const;
 
     bool isTransparent() const;
     RenderLayer* transparentPaintingAncestor();
-    void beginTransparencyLayers(GraphicsContext*, const RenderLayer* rootLayer, const LayoutRect& paintDirtyRect, PaintBehavior);
+    void beginTransparencyLayers(GraphicsContext*, const RenderLayer* rootLayer, const LayoutRect& paintDirtyRect, const LayoutSize& subPixelAccumulation, PaintBehavior);
 
     bool isReflection() const { return renderer()->isReplica(); }
     RenderLayerReflectionInfo* reflectionInfo() { return m_reflectionInfo.get(); }
     const RenderLayerReflectionInfo* reflectionInfo() const { return m_reflectionInfo.get(); }
 
     const RenderLayer* root() const
     {
         const RenderLayer* curr = this;
         while (curr->parent())
             curr = curr->parent();
@@ skipping 441 matching lines @@
 
     void updateDescendantDependentFlags();
 
     void dirty3DTransformedDescendantStatus();
     // Both updates the status, and returns true if descendants of this have 3d.
     bool update3DTransformedDescendantStatus();
 
     void updateOrRemoveFilterClients();
     void updateOrRemoveFilterEffectRenderer();
 
-    LayoutRect paintingExtent(const RenderLayer* rootLayer, const LayoutRect& paintDirtyRect, PaintBehavior);
+    LayoutRect paintingExtent(const RenderLayer* rootLayer, const LayoutRect& paintDirtyRect, const LayoutSize& subPixelAccumulation, PaintBehavior);
 
     RenderLayer* enclosingTransformedAncestor() const;
 
     void updatePagination();
 
     // FIXME: Temporary. Remove when new columns come online.
     bool useRegionBasedColumns() const;
 
     bool hasCompositingDescendant() const { return m_compositingProperties.hasCompositingDescendant; }
     void setHasCompositingDescendant(bool b)  { m_compositingProperties.hasCompositingDescendant = b; }
@@ skipping 151 matching lines @@
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const WebCore::RenderLayer*);
 void showLayerTree(const WebCore::RenderObject*);
 #endif
 
 #endif // RenderLayer_h