Factor painting code out of RenderBox into a new class called BoxPainter.

Source/core/rendering/RenderBoxModelObject.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 227 matching lines @@
         IntPoint m_phase;
         IntSize m_tileSize;
         IntSize m_repeatSpacing;
         bool m_hasNonLocalGeometry; // Has background-attachment: fixed. Implies that we can't always cheaply compute destRect.
     };
 
     LayoutPoint adjustedPositionRelativeToOffsetParent(const LayoutPoint&) const;
 
     bool calculateHasBoxDecorations() const;
     void calculateBackgroundImageGeometry(const RenderLayerModelObject* paintContainer, const FillLayer&, const LayoutRect& paintRect, BackgroundImageGeometry&, RenderObject* = 0) const;
-    void getBorderEdgeInfo(class BorderEdge[], const RenderStyle*, bool includeLogicalLeftEdge = true, bool includeLogicalRightEdge = true) const;
-    bool borderObscuresBackgroundEdge(const FloatSize& contextScale) const;
-    bool borderObscuresBackground() const;
     RoundedRect backgroundRoundedRectAdjustedForBleedAvoidance(GraphicsContext*, const LayoutRect&, BackgroundBleedAvoidance, InlineFlowBox*, const LayoutSize&, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const;
     LayoutRect borderInnerRectAdjustedForBleedAvoidance(GraphicsContext*, const LayoutRect&, BackgroundBleedAvoidance) const;
 
     InterpolationQuality chooseInterpolationQuality(GraphicsContext*, Image*, const void*, const LayoutSize&);
 
     RenderBoxModelObject* continuation() const;
     virtual void setContinuation(RenderBoxModelObject*);
 
     LayoutRect localCaretRectForEmptyElement(LayoutUnit width, LayoutUnit textIndentOffset);
 
     static void clipRoundedInnerRect(GraphicsContext*, const LayoutRect&, const RoundedRect& clipRect);
 
     bool hasAutoHeightOrContainingBlockWithAutoHeight() const;
 
+public:
+    void paintRootBackgroundColor(const PaintInfo&, const LayoutRect&, const Color&);
+
+    // FIXME: Slimming Paint: make this private again after moving paint code in this class to paint/
     bool isDocumentElementWithOpaqueBackground() const;

[Stephen Chennney, 2014/09/09 19:16:48]

I would move these methods up to the existing public block, leaving the comment
to fix later.

[chrishtr, 2014/09/09 19:50:35]

Done.

 
-    void paintRootBackgroundColor(const PaintInfo&, const LayoutRect&, const Color&);
-
-public:
     static bool shouldAntialiasLines(GraphicsContext*);
 
     // For RenderBlocks and RenderInlines with m_style->styleType() == FIRST_LETTER, this tracks their remaining text fragments
     RenderTextFragment* firstLetterRemainingText() const;
     void setFirstLetterRemainingText(RenderTextFragment*);
 
     // These functions are only used internally to manipulate the render tree structure via remove/insert/appendChildNode.
     // Since they are typically called only to move objects around within anonymous blocks (which only have layers in
     // the case of column spans), the default for fullRemoveInsert is false rather than true.
     void moveChildTo(RenderBoxModelObject* toBoxModelObject, RenderObject* child, RenderObject* beforeChild, bool fullRemoveInsert = false);
@@ skipping 45 matching lines @@
     void drawBoxSideFromPath(GraphicsContext*, const LayoutRect&, const Path&, const class BorderEdge[],
                             float thickness, float drawThickness, BoxSide, const RenderStyle*,
                             Color, EBorderStyle, BackgroundBleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBoxModelObject, isBoxModelObject());
 
 } // namespace blink
 
 #endif // RenderBoxModelObject_h