Table cell background painting

third_party/WebKit/Source/core/layout/LayoutTableSection.cpp

Index: third_party/WebKit/Source/core/layout/LayoutTableSection.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutTableSection.cpp b/third_party/WebKit/Source/core/layout/LayoutTableSection.cpp
index 901dfb458dbcee07d724b2053983d012986aeb79..715be719547269ef02b06477499d0443c6b6387f 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTableSection.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutTableSection.cpp
@@ -1647,4 +1647,30 @@ void LayoutTableSection::setLogicalPositionForCell(LayoutTableCell* cell, unsign
     cell->setLogicalLocation(cellLocation);
 }
 
+LayoutRect LayoutTableSection::positionByCellSpan() const
+{
+    LayoutRect position;
+    LayoutTableRow* firstRow = this->firstRow();
+    LayoutTableRow* lastRow = this->lastRow();
+    if (firstRow && lastRow) {
+        position = firstRow->positionByCellSpan();
+        position.unite(lastRow->positionByCellSpan());
+    }
+    return position;
+}
+
+// Ideal cell is a cell that spans single row/column.
+// It is used to calculate position of colgroup/col/row
+// It is needed because actual cells can be arbitrary rectangles, or non-existent
+LayoutRect LayoutTableSection::positionOfIdealCell(unsigned row, unsigned col) const
+{
+    LayoutRect position;
+    LayoutTable * table = this->table();
+    unsigned left = table->columnPositions()[col];
+    unsigned top = m_rowPos[row];
+    unsigned right = table->columnPositions()[col+1];
+    unsigned bottom = m_rowPos[row+1];
+    left += table->hBorderSpacing();
+    return LayoutRect(LayoutPoint(left, top), LayoutSize(right - left, bottom-top));
+}
 } // namespace blink