Optimize for horizontal writing mode

Source/core/paint/BlockPainter.cpp

Index: Source/core/paint/BlockPainter.cpp
diff --git a/Source/core/paint/BlockPainter.cpp b/Source/core/paint/BlockPainter.cpp
index b92e7b3e5549a8e0a76197024be600725dcff16c..1e599981110b9cbbe25a0b57a19458a7ceeb04b9 100644
--- a/Source/core/paint/BlockPainter.cpp
+++ b/Source/core/paint/BlockPainter.cpp
@@ -109,8 +109,11 @@ void BlockPainter::paintInlineBox(InlineBox& inlineBox, PaintInfo& paintInfo, co
         return;
 
     LayoutPoint childPoint = paintOffset;
-    if (inlineBox.parent()->renderer().style()->isFlippedBlocksWritingMode()) // Faster than calling containingBlock().
+    const RenderObject& renderer = inlineBox.parent()->renderer();
+    if (!UNLIKELY(renderer.document().containsAnyVerticalWritingModes())
+        && renderer.style()->slowIsFlippedBlocksWritingMode()) { // Faster than calling containingBlock().

[pdr., 2014/10/21 23:35:34]

I think this comment belongs with the parent() call on line 112.

         childPoint = inlineBox.renderer().containingBlock()->flipForWritingModeForChild(&toRenderBox(inlineBox.renderer()), childPoint);
+    }
 
     paintAsInlineBlock(&inlineBox.renderer(), paintInfo, childPoint);
 }
@@ -331,7 +334,7 @@ void BlockPainter::paintColumnRules(PaintInfo& paintInfo, const LayoutPoint& pai
             ruleLogicalLeft = currLogicalLeftOffset;
         }
     } else {
-        bool topToBottom = !m_renderBlock.style()->isFlippedBlocksWritingMode();
+        bool topToBottom = !m_renderBlock.style()->slowIsFlippedBlocksWritingMode();
         LayoutUnit ruleLeft = m_renderBlock.isHorizontalWritingMode()
             ? m_renderBlock.borderLeft() + m_renderBlock.paddingLeft()
             : colGap / 2 - colGap - ruleThickness / 2 + m_renderBlock.borderBefore() + m_renderBlock.paddingBefore();
@@ -418,7 +421,7 @@ void BlockPainter::paintColumnContents(PaintInfo& paintInfo, const LayoutPoint&
         }
 
         LayoutUnit blockDelta = (m_renderBlock.isHorizontalWritingMode() ? colRect.height() : colRect.width());
-        if (m_renderBlock.style()->isFlippedBlocksWritingMode())
+        if (m_renderBlock.style()->slowIsFlippedBlocksWritingMode())
             currLogicalTopOffset += blockDelta;
         else
             currLogicalTopOffset -= blockDelta;