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

Source/core/rendering/RenderBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 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 12 matching lines @@
 #ifndef RenderBox_h
 #define RenderBox_h
 
 #include "core/rendering/RenderBoxModelObject.h"
 #include "core/rendering/RenderOverflow.h"
 #include "core/rendering/shapes/ShapeOutsideInfo.h"
 #include "platform/scroll/ScrollTypes.h"
 
 namespace WebCore {
 
-class RenderBoxRegionInfo;
-class RenderRegion;
 struct PaintInfo;
 
 enum SizeType { MainOrPreferredSize, MinSize, MaxSize };
 enum AvailableLogicalHeightType { ExcludeMarginBorderPadding, IncludeMarginBorderPadding };
 enum OverlayScrollbarSizeRelevancy { IgnoreOverlayScrollbarSize, IncludeOverlayScrollbarSize };
 
 enum ShouldComputePreferred { ComputeActual, ComputePreferred };
 
 enum ContentsClipBehavior { ForceContentsClip, SkipContentsClipIfPossible };
 
@@ skipping 43 matching lines @@
     void setWidth(LayoutUnit width) { m_frameRect.setWidth(width); }
     void setHeight(LayoutUnit height) { m_frameRect.setHeight(height); }
 
     LayoutUnit logicalLeft() const { return style()->isHorizontalWritingMode() ? x() : y(); }
     LayoutUnit logicalRight() const { return logicalLeft() + logicalWidth(); }
     LayoutUnit logicalTop() const { return style()->isHorizontalWritingMode() ? y() : x(); }
     LayoutUnit logicalBottom() const { return logicalTop() + logicalHeight(); }
     LayoutUnit logicalWidth() const { return style()->isHorizontalWritingMode() ? width() : height(); }
     LayoutUnit logicalHeight() const { return style()->isHorizontalWritingMode() ? height() : width(); }
 
-    LayoutUnit constrainLogicalWidthInRegionByMinMax(LayoutUnit, LayoutUnit, RenderBlock*, RenderRegion* = 0) const;
+    LayoutUnit constrainLogicalWidthByMinMax(LayoutUnit, LayoutUnit, RenderBlock*) const;
     LayoutUnit constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const;
     LayoutUnit constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const;
 
     int pixelSnappedLogicalHeight() const { return style()->isHorizontalWritingMode() ? pixelSnappedHeight() : pixelSnappedWidth(); }
     int pixelSnappedLogicalWidth() const { return style()->isHorizontalWritingMode() ? pixelSnappedWidth() : pixelSnappedHeight(); }
 
     void setLogicalLeft(LayoutUnit left)
     {
         if (style()->isHorizontalWritingMode())
             setX(left);
@@ skipping 264 matching lines @@
         ComputedMarginValues m_margins;
     };
     // Resolve auto margins in the inline direction of the containing block so that objects can be pushed to the start, middle or end
     // of the containing block.
     void computeInlineDirectionMargins(RenderBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const;
 
     // Used to resolve margins in the containing block's block-flow direction.
     void computeBlockDirectionMargins(const RenderBlock* containingBlock, LayoutUnit& marginBefore, LayoutUnit& marginAfter) const;
     void computeAndSetBlockDirectionMargins(const RenderBlock* containingBlock);
 
-    enum RenderBoxRegionInfoFlags { CacheRenderBoxRegionInfo, DoNotCacheRenderBoxRegionInfo };
-    LayoutRect borderBoxRectInRegion(RenderRegion*, RenderBoxRegionInfoFlags = CacheRenderBoxRegionInfo) const;
-    void clearRenderBoxRegionInfo();
     virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const;
 
     void positionLineBox(InlineBox*);
 
     virtual InlineBox* createInlineBox();
     void dirtyLineBoxes(bool fullLayout);
 
     // For inline replaced elements, this function returns the inline box that owns us.  Enables
     // the replaced RenderObject to quickly determine what line it is contained on and to easily
     // iterate over structures on the line.
     InlineBox* inlineBoxWrapper() const { return m_inlineBoxWrapper; }
     void setInlineBoxWrapper(InlineBox*);
     void deleteLineBoxWrapper();
 
     virtual LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const OVERRIDE;
     virtual void computeRectForRepaint(const RenderLayerModelObject* repaintContainer, LayoutRect&, bool fixed = false) const OVERRIDE;
     void repaintDuringLayoutIfMoved(const LayoutRect&);
     virtual void repaintOverhangingFloats(bool paintAllDescendants);
 
     virtual LayoutUnit containingBlockLogicalWidthForContent() const OVERRIDE;
     LayoutUnit containingBlockLogicalHeightForContent(AvailableLogicalHeightType) const;
 
-    LayoutUnit containingBlockLogicalWidthForContentInRegion(RenderRegion*) const;
-    LayoutUnit containingBlockAvailableLineWidthInRegion(RenderRegion*) const;
+    LayoutUnit containingBlockAvailableLineWidth() const;
     LayoutUnit perpendicularContainingBlockLogicalHeight() const;
 
     virtual void updateLogicalWidth();
     virtual void updateLogicalHeight();
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const;
-
-    RenderBoxRegionInfo* renderBoxRegionInfo(RenderRegion*, RenderBoxRegionInfoFlags = CacheRenderBoxRegionInfo) const;
-    void computeLogicalWidthInRegion(LogicalExtentComputedValues&, RenderRegion* = 0) const;
+    void computeLogicalWidth(LogicalExtentComputedValues&) const;
 
     bool stretchesToViewport() const
     {
         return document().inQuirksMode() && style()->logicalHeight().isAuto() && !isFloatingOrOutOfFlowPositioned() && (isRoot() || isBody()) && !document().shouldDisplaySeamlesslyWithParent() && !isInline();
     }
 
     virtual LayoutSize intrinsicSize() const { return LayoutSize(); }
     LayoutUnit intrinsicLogicalWidth() const { return style()->isHorizontalWritingMode() ? intrinsicSize().width() : intrinsicSize().height(); }
     LayoutUnit intrinsicLogicalHeight() const { return style()->isHorizontalWritingMode() ? intrinsicSize().height() : intrinsicSize().width(); }
 
     // Whether or not the element shrinks to its intrinsic width (rather than filling the width
     // of a containing block).  HTML4 buttons, <select>s, <input>s, legends, and floating/compact elements do this.
     bool sizesLogicalWidthToFitContent(SizeType) const;
 
-    LayoutUnit shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlockFlow* cb, RenderRegion*) const;
+    LayoutUnit shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlockFlow* cb) const;
 
-    LayoutUnit computeLogicalWidthInRegionUsing(SizeType, Length logicalWidth, LayoutUnit availableLogicalWidth, const RenderBlock* containingBlock, RenderRegion*) const;
+    LayoutUnit computeLogicalWidthUsing(SizeType, Length logicalWidth, LayoutUnit availableLogicalWidth, const RenderBlock* containingBlock) const;
     LayoutUnit computeLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const;
     LayoutUnit computeContentLogicalHeight(const Length& height, LayoutUnit intrinsicContentHeight) const;
     LayoutUnit computeContentAndScrollbarLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const;
     LayoutUnit computeReplacedLogicalWidthUsing(Length width) const;
     LayoutUnit computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit logicalWidth, ShouldComputePreferred  = ComputeActual) const;
     LayoutUnit computeReplacedLogicalHeightUsing(Length height) const;
     LayoutUnit computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit logicalHeight) const;
 
     virtual LayoutUnit computeReplacedLogicalWidth(ShouldComputePreferred  = ComputeActual) const;
     virtual LayoutUnit computeReplacedLogicalHeight() const;
@@ skipping 38 matching lines @@
 
     // Elements such as the <input> field override this to specify that they are scrollable
     // outside the context of the CSS overflow style
     virtual bool isIntristicallyScrollable(ScrollbarOrientation orientation) const { return false; }
 
     bool hasUnsplittableScrollingOverflow() const;
     bool isUnsplittableForPagination() const;
 
     virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) OVERRIDE;
 
-    virtual LayoutRect overflowClipRect(const LayoutPoint& location, RenderRegion*, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize);
-    LayoutRect clipRect(const LayoutPoint& location, RenderRegion*);
+    virtual LayoutRect overflowClipRect(const LayoutPoint& location, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize);
+    LayoutRect clipRect(const LayoutPoint& location);
     virtual bool hasControlClip() const { return false; }
     virtual LayoutRect controlClipRect(const LayoutPoint&) const { return LayoutRect(); }
     bool pushContentsClip(PaintInfo&, const LayoutPoint& accumulatedOffset, ContentsClipBehavior);
     void popContentsClip(PaintInfo&, PaintPhase originalPhase, const LayoutPoint& accumulatedOffset);
 
     virtual void paintObject(PaintInfo&, const LayoutPoint&) { ASSERT_NOT_REACHED(); }
     virtual void paintBoxDecorations(PaintInfo&, const LayoutPoint&);
     virtual void paintMask(PaintInfo&, const LayoutPoint&);
     virtual void paintClippingMask(PaintInfo&, const LayoutPoint&);
     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) OVERRIDE;
@@ skipping 123 matching lines @@
 
     void paintFillLayer(const PaintInfo&, const Color&, const FillLayer*, const LayoutRect&, BackgroundBleedAvoidance, CompositeOperator, RenderObject* backgroundObject);
     void paintFillLayers(const PaintInfo&, const Color&, const FillLayer*, const LayoutRect&, BackgroundBleedAvoidance = BackgroundBleedNone, CompositeOperator = CompositeSourceOver, RenderObject* backgroundObject = 0);
 
     void paintMaskImages(const PaintInfo&, const LayoutRect&);
     void paintBoxDecorationsWithRect(PaintInfo&, const LayoutPoint&, const LayoutRect&);
 
     BackgroundBleedAvoidance determineBackgroundBleedAvoidance(GraphicsContext*) const;
     bool backgroundHasOpaqueTopLayer() const;
 
-    void computePositionedLogicalWidth(LogicalExtentComputedValues&, RenderRegion* = 0) const;
+    void computePositionedLogicalWidth(LogicalExtentComputedValues&) const;
 
     LayoutUnit computeIntrinsicLogicalWidthUsing(Length logicalWidthLength, LayoutUnit availableLogicalWidth, LayoutUnit borderAndPadding) const;
     LayoutUnit computeIntrinsicLogicalContentHeightUsing(Length logicalHeightLength, LayoutUnit intrinsicContentHeight, LayoutUnit borderAndPadding) const;
 
     virtual bool shouldComputeSizeAsReplaced() const { return isReplaced() && !isInlineBlockOrInlineTable(); }
 
     virtual void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0) const OVERRIDE;
     virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const OVERRIDE;
 
     void paintRootBoxFillLayers(const PaintInfo&);
 
     RenderObject* splitAnonymousBoxesAroundChild(RenderObject* beforeChild);
 
     virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer* currentCompositedLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const OVERRIDE;
     virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const OVERRIDE;
 
 private:
     void updateShapeOutsideInfoAfterStyleChange(const RenderStyle&, const RenderStyle* oldStyle);
     void updateGridPositionAfterStyleChange(const RenderStyle*);
 
     bool autoWidthShouldFitContent() const;
     void shrinkToFitWidth(const LayoutUnit availableSpace, const LayoutUnit logicalLeftValue, const LayoutUnit bordersPlusPadding, LogicalExtentComputedValues&) const;
 
     // Returns true if we did a full repaint
     bool repaintLayerRectsForImage(WrappedImagePtr image, const FillLayer* layers, bool drawingBackground);
 
     bool skipContainingBlockForPercentHeightCalculation(const RenderBox* containingBlock) const;
 
-    LayoutUnit containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, RenderRegion* = 0, bool checkForPerpendicularWritingMode = true) const;
+    LayoutUnit containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const;
     LayoutUnit containingBlockLogicalHeightForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const;
 
     LayoutUnit viewLogicalHeightForPercentages() const;
 
     void computePositionedLogicalHeight(LogicalExtentComputedValues&) const;
     void computePositionedLogicalWidthUsing(Length logicalWidth, const RenderBoxModelObject* containerBlock, TextDirection containerDirection,
                                             LayoutUnit containerLogicalWidth, LayoutUnit bordersPlusPadding,
                                             Length logicalLeft, Length logicalRight, Length marginLogicalLeft, Length marginLogicalRight,
                                             LogicalExtentComputedValues&) const;
     void computePositionedLogicalHeightUsing(Length logicalHeightLength, const RenderBoxModelObject* containerBlock,
@@ skipping 79 matching lines @@
         if (UNLIKELY(m_inlineBoxWrapper != 0))
             deleteLineBoxWrapper();
     }
 
     m_inlineBoxWrapper = boxWrapper;
 }
 
 } // namespace WebCore
 
 #endif // RenderBox_h