*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/rendering/RenderBlock.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple 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 229 matching lines @@
     void setMarginEndForChild(RenderBox* child, LayoutUnit value) const { child->setMarginEnd(value, style()); }
     void setMarginBeforeForChild(RenderBox* child, LayoutUnit value) const { child->setMarginBefore(value, style()); }
     void setMarginAfterForChild(RenderBox* child, LayoutUnit value) const { child->setMarginAfter(value, style()); }
     LayoutUnit collapsedMarginBeforeForChild(const RenderBox* child) const;
     LayoutUnit collapsedMarginAfterForChild(const RenderBox* child) const;
 
     virtual void updateFirstLetter();
 
     virtual void scrollbarsChanged(bool /*horizontalScrollbarChanged*/, bool /*verticalScrollbarChanged*/) { };
 
-    LayoutUnit logicalLeftOffsetForContent(RenderRegion*) const;
-    LayoutUnit logicalRightOffsetForContent(RenderRegion*) const;
-    LayoutUnit availableLogicalWidthForContent(RenderRegion* region) const
+    LayoutUnit availableLogicalWidthForContent() const
     {
-        return max<LayoutUnit>(0, logicalRightOffsetForContent(region) - logicalLeftOffsetForContent(region));
-    }
-    LayoutUnit startOffsetForContent(RenderRegion* region) const
-    {
-        return style()->isLeftToRightDirection() ? logicalLeftOffsetForContent(region) : logicalWidth() - logicalRightOffsetForContent(region);
-    }
-    LayoutUnit endOffsetForContent(RenderRegion* region) const
-    {
-        return !style()->isLeftToRightDirection() ? logicalLeftOffsetForContent(region) : logicalWidth() - logicalRightOffsetForContent(region);
-    }
-    LayoutUnit logicalLeftOffsetForContent(LayoutUnit blockOffset) const
-    {
-        return logicalLeftOffsetForContent(regionAtBlockOffset(blockOffset));
-    }
-    LayoutUnit logicalRightOffsetForContent(LayoutUnit blockOffset) const
-    {
-        return logicalRightOffsetForContent(regionAtBlockOffset(blockOffset));
-    }
-    LayoutUnit availableLogicalWidthForContent(LayoutUnit blockOffset) const
-    {
-        return availableLogicalWidthForContent(regionAtBlockOffset(blockOffset));
-    }
-    LayoutUnit startOffsetForContent(LayoutUnit blockOffset) const
-    {
-        return startOffsetForContent(regionAtBlockOffset(blockOffset));
-    }
-    LayoutUnit endOffsetForContent(LayoutUnit blockOffset) const
-    {
-        return endOffsetForContent(regionAtBlockOffset(blockOffset));
+        return max<LayoutUnit>(0, logicalRightOffsetForContent() - logicalLeftOffsetForContent());
     }
     LayoutUnit logicalLeftOffsetForContent() const { return isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop(); }
     LayoutUnit logicalRightOffsetForContent() const { return logicalLeftOffsetForContent() + availableLogicalWidth(); }
     LayoutUnit startOffsetForContent() const { return style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
     LayoutUnit endOffsetForContent() const { return !style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
 
 #ifndef NDEBUG
     void checkPositionedObjectsNeedLayout();
     void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const RenderObject* = 0) const;
 #endif
@@ skipping 85 matching lines @@
 protected:
     virtual void addOverflowFromChildren();
     void addOverflowFromPositionedObjects();
     void addOverflowFromBlockChildren();
     void addVisualOverflowFromTheme();
 
     virtual void addFocusRingRects(Vector<IntRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer = 0) OVERRIDE;
 
     virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const OVERRIDE;
 
-    bool updateRegionsAndShapesLogicalSize(RenderFlowThread*);
-    void computeRegionRangeForBlock(RenderFlowThread*);
-
     void updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox*);
 
     virtual void checkForPaginationLogicalHeightChange(LayoutUnit& pageLogicalHeight, bool& pageLogicalHeightChanged, bool& hasSpecifiedPageLogicalHeight);
 
     virtual bool isInlineBlockOrInlineTable() const OVERRIDE FINAL { return isInline() && isReplaced(); }
 
 private:
     void computeShapeSize();
-    void updateRegionsAndShapesAfterChildLayout(RenderFlowThread*, bool);
     void updateShapeInsideInfoAfterStyleChange(const ShapeValue*, const ShapeValue* oldShape);
     void relayoutShapeDescendantIfMoved(RenderBlock* child, LayoutSize offset);
 
     virtual RenderObjectChildList* virtualChildren() OVERRIDE FINAL { return children(); }
     virtual const RenderObjectChildList* virtualChildren() const OVERRIDE FINAL { return children(); }
 
     virtual const char* renderName() const OVERRIDE;
 
     virtual bool isRenderBlock() const OVERRIDE FINAL { return true; }
 
@@ skipping 138 matching lines @@
 
     // A page break is required at some offset due to space shortage in the current fragmentainer.
     void setPageBreak(LayoutUnit offset, LayoutUnit spaceShortage);
 
     // Update minimum page height required to avoid fragmentation where it shouldn't occur (inside
     // unbreakable content, between orphans and widows, etc.). This will be used as a hint to the
     // column balancer to help set a good minimum column height.
     void updateMinimumPageHeight(LayoutUnit offset, LayoutUnit minHeight);
 
     LayoutUnit adjustForUnsplittableChild(RenderBox* child, LayoutUnit logicalOffset, bool includeMargins = false); // If the child is unsplittable and can't fit on the current page, return the top of the next page/column.
-    void adjustLinePositionForPagination(RootInlineBox*, LayoutUnit& deltaOffset, RenderFlowThread*); // Computes a deltaOffset value that put a line at the top of the next page if it doesn't fit on the current page.
-    void updateRegionForLine(RootInlineBox*) const;
+    void adjustLinePositionForPagination(RootInlineBox*, LayoutUnit& deltaOffset); // Computes a deltaOffset value that put a line at the top of the next page if it doesn't fit on the current page.
 
     // Adjust from painting offsets to the local coords of this renderer
     void offsetForContents(LayoutPoint&) const;
 
     // This function is called to test a line box that has moved in the block direction to see if it has ended up in a new
     // region/page/column that has a different available line width than the old one. Used to know when you have to dirty a
     // line, i.e., that it can't be re-used.
-    bool lineWidthForPaginatedLineChanged(RootInlineBox*, LayoutUnit lineDelta, RenderFlowThread*) const;
-
-    bool logicalWidthChangedInRegions(RenderFlowThread*) const;
+    bool lineWidthForPaginatedLineChanged(RootInlineBox*, LayoutUnit lineDelta) const;
 
     virtual bool requiresColumns(int desiredColumnCount) const;
 
     virtual bool updateLogicalWidthAndColumnWidth();
 
     virtual bool canCollapseAnonymousBlockChild() const { return true; }
 
 public:
     virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const OVERRIDE FINAL;
-    RenderRegion* regionAtBlockOffset(LayoutUnit) const;
-    RenderRegion* clampToStartAndEndRegions(RenderRegion*) const;
 
 public:
 
     // Allocated only when some of these fields have non-default values
     struct RenderBlockRareData {
         WTF_MAKE_NONCOPYABLE(RenderBlockRareData); WTF_MAKE_FAST_ALLOCATED;
     public:
         RenderBlockRareData()
             : m_paginationStrut(0)
             , m_pageLogicalOffset(0)
@@ skipping 33 matching lines @@
     // FIXME: This is temporary as we move code that accesses block flow
     // member variables out of RenderBlock and into RenderBlockFlow.
     friend class RenderBlockFlow;
 };
 
 
 inline bool RenderBlock::allowsShapeInsideInfoSharing(const RenderBlock* other) const
 {
     if (!other)
         return false;
-    for (const RenderBlock* current = this; current && current != other && !current->isRenderFlowThread(); current = current->containingBlock()) {
+    for (const RenderBlock* current = this; current && current != other; current = current->containingBlock()) {
         if (current->isInline() || current->isFloating())
             return false;
         if (current->parent() != current->containingBlock())
             return false;
     }
     return true;
 }
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());
 
 } // namespace WebCore
 
 #endif // RenderBlock_h