Optimized box border side painting order

Source/core/paint/BoxBorderPainter.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BoxBorderPainter_h
 #define BoxBorderPainter_h
 
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/style/BorderEdge.h"
 #include "platform/geometry/FloatRoundedRect.h"
 #include "platform/heap/Heap.h"
 
 namespace blink {
 
 class ComputedStyle;
 class IntRect;
 class LayoutBox;
 class LayoutRect;
 struct PaintInfo;
 
 class BoxBorderPainter {
     STACK_ALLOCATED();
 public:
     BoxBorderPainter(const LayoutRect& borderRect, const ComputedStyle&, const IntRect& clipRect,
         BackgroundBleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
 
     void paintBorder(const PaintInfo&, const LayoutRect& borderRect) const;
 
 private:
+    struct ComplexBorderInfo;
+
+    BorderEdgeFlags paintOpacityGroup(GraphicsContext*, const ComplexBorderInfo&, unsigned index,
+        float accumulatedOpacity) const;
+    void paintSide(GraphicsContext*, const ComplexBorderInfo&, BoxSide, unsigned alpha, BorderEdgeFlags) const;
+    void paintOneBorderSide(GraphicsContext*, const FloatRect& sideRect, BoxSide, BoxSide adjacentSide1,
+        BoxSide adjacentSide2, const Path*, bool antialias, Color, BorderEdgeFlags) const;
     bool paintBorderFastPath(GraphicsContext*, const LayoutRect& borderRect) const;
     void drawDoubleBorder(GraphicsContext*, const LayoutRect& borderRect) const;
 
-    void paintTranslucentBorderSides(GraphicsContext*, bool antialias) const;
-    void paintOneBorderSide(GraphicsContext*, const FloatRect& sideRect, BoxSide, BoxSide adjacentSide1,
-        BoxSide adjacentSide2, const Path*, bool antialias, const Color* overrideColor) const;
-    void paintBorderSides(GraphicsContext*, BorderEdgeFlags edgeSet, bool antialias,
-        const Color* overrideColor = 0) const;
     void drawBoxSideFromPath(GraphicsContext*, const LayoutRect&, const Path&, float thickness,
         float drawThickness, BoxSide, Color, EBorderStyle) const;
     void clipBorderSidePolygon(GraphicsContext*, BoxSide, bool firstEdgeMatches,
         bool secondEdgeMatches) const;
     void clipBorderSideForComplexInnerPath(GraphicsContext*, BoxSide) const;
 
     const BorderEdge& firstEdge() const
     {
         ASSERT(m_visibleEdgeSet);
         return m_edges[m_firstVisibleEdge];
@@ skipping 10 matching lines @@
     FloatRoundedRect m_inner;
     BorderEdge m_edges[4];
 
     unsigned m_visibleEdgeCount;
     unsigned m_firstVisibleEdge;
     BorderEdgeFlags m_visibleEdgeSet;
 
     bool m_isUniformStyle;
     bool m_isUniformWidth;
     bool m_isUniformColor;
+    bool m_isRounded;
     bool m_hasAlpha;
 };
 
 } // namespace blink
 
 #endif