Refactor background painting behind table cells

third_party/WebKit/Source/core/paint/TableSectionPainter.h

 // Copyright 2014 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 TableSectionPainter_h
 #define TableSectionPainter_h
 
 #include "core/paint/PaintPhase.h"
+#include "core/style/ShadowData.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
+class CellSpan;
 class CollapsedBorderValue;
 class LayoutPoint;
 class LayoutTableCell;
 class LayoutTableSection;
 struct PaintInfo;
 
 class TableSectionPainter {
     STACK_ALLOCATED();
 public:
     TableSectionPainter(const LayoutTableSection& layoutTableSection) : m_layoutTableSection(layoutTableSection) { }
 
     void paint(const PaintInfo&, const LayoutPoint&);
     void paintCollapsedBorders(const PaintInfo&, const LayoutPoint&, const CollapsedBorderValue&);
 
 private:
     void paintObject(const PaintInfo&, const LayoutPoint&);
-    void paintCell(const LayoutTableCell&, PaintPhase originalPaintPhase, const PaintInfo&, const LayoutPoint&);
+
+    void paintBackgroundsBehindCell(const LayoutTableCell&, const PaintInfo&, const LayoutPoint&);
+    void paintCell(const LayoutTableCell&, const PaintInfo&, const LayoutPoint&);
+
+    // Returns the primary cell that should be painted for the grid item at (row, column)
+    // intersecting dirtiedRows and dirtiedColumns. Returns nullptr if we have painted the grid item
+    // when painting the grid item left to or above (row, column) when painting cells intersecting
+    // dirtiedRows and dirtiedColumns.
+    const LayoutTableCell* primaryCellToPaint(unsigned row, unsigned column, const CellSpan& dirtiedRows, const CellSpan& dirtiedColumns) const;

[Xianzhu, 2016/05/16 21:47:53]

Done.

 
     const LayoutTableSection& m_layoutTableSection;
 };
 
 } // namespace blink
 
 #endif // TableSectionPainter_h