text: /*
   * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above
   *    copyright notice, this list of conditions and the following
   *    disclaimer.
   * 2. Redistributions in binary form must reproduce the above
   *    copyright notice, this list of conditions and the following
   *    disclaimer in the documentation and/or other materials
   *    provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
   * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
   * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #pragma once
  
  #include "LayoutSize.h"
  #include "Shape.h"
  #include <wtf/HashMap.h>
  #include <wtf/NeverDestroyed.h>
  
  namespace WebCore {
  
  class RenderBlockFlow;
  class RenderBox;
  class StyleImage;
  class FloatingObject;
  
  class ShapeOutsideDeltas final {
  public:
      ShapeOutsideDeltas()
          : m_lineOverlapsShape(false)
          , m_isValid(false)
      {
      }
  
      ShapeOutsideDeltas(LayoutUnit leftMarginBoxDelta, LayoutUnit rightMarginBoxDelta, bool lineOverlapsShape, LayoutUnit borderBoxLineTop, LayoutUnit lineHeight)
          : m_leftMarginBoxDelta(leftMarginBoxDelta)
          , m_rightMarginBoxDelta(rightMarginBoxDelta)
          , m_borderBoxLineTop(borderBoxLineTop)
          , m_lineHeight(lineHeight)
          , m_lineOverlapsShape(lineOverlapsShape)
          , m_isValid(true)
      {
      }
  
      bool isForLine(LayoutUnit borderBoxLineTop, LayoutUnit lineHeight)
      {
          return m_isValid && m_borderBoxLineTop == borderBoxLineTop && m_lineHeight == lineHeight;
      }
  
      bool isValid() { return m_isValid; }
      LayoutUnit leftMarginBoxDelta() { ASSERT(m_isValid); return m_leftMarginBoxDelta; }
      LayoutUnit rightMarginBoxDelta() { ASSERT(m_isValid); return m_rightMarginBoxDelta; }
      bool lineOverlapsShape() { ASSERT(m_isValid); return m_lineOverlapsShape; }
  
  private:
      LayoutUnit m_leftMarginBoxDelta;
      LayoutUnit m_rightMarginBoxDelta;
      LayoutUnit m_borderBoxLineTop;
      LayoutUnit m_lineHeight;
      unsigned m_lineOverlapsShape : 1;
      unsigned m_isValid : 1;
  };
  
  class ShapeOutsideInfo final {
      WTF_MAKE_FAST_ALLOCATED;
  public:
      ShapeOutsideInfo(const RenderBox& renderer)
          : m_renderer(renderer)
      {
      }
  
      static bool isEnabledFor(const RenderBox&);
  
      ShapeOutsideDeltas computeDeltasForContainingBlockLine(const RenderBlockFlow&, const FloatingObject&, LayoutUnit lineTop, LayoutUnit lineHeight);
  
      void setReferenceBoxLogicalSize(LayoutSize);
  
      LayoutUnit shapeLogicalTop() const { return computedShape().shapeMarginLogicalBoundingBox().y() + logicalTopOffset(); }
      LayoutUnit shapeLogicalBottom() const { return computedShape().shapeMarginLogicalBoundingBox().maxY() + logicalTopOffset(); }
      LayoutUnit shapeLogicalLeft() const { return computedShape().shapeMarginLogicalBoundingBox().x() + logicalLeftOffset(); }
      LayoutUnit shapeLogicalRight() const { return computedShape().shapeMarginLogicalBoundingBox().maxX() + logicalLeftOffset(); }
      LayoutUnit shapeLogicalWidth() const { return computedShape().shapeMarginLogicalBoundingBox().width(); }
      LayoutUnit shapeLogicalHeight() const { return computedShape().shapeMarginLogicalBoundingBox().height(); }
  
      void markShapeAsDirty() { m_shape = nullptr; }
      bool isShapeDirty() { return !m_shape; }
  
      LayoutRect computedShapePhysicalBoundingBox() const;
      FloatPoint shapeToRendererPoint(const FloatPoint&) const;
      FloatSize shapeToRendererSize(const FloatSize&) const;
  
      const Shape& computedShape() const;
  
      static ShapeOutsideInfo& ensureInfo(const RenderBox& key)
      {
          InfoMap& infoMap = ShapeOutsideInfo::infoMap();
          if (ShapeOutsideInfo* info = infoMap.get(&key))
              return *info;
          auto result = infoMap.add(&key, std::make_unique<ShapeOutsideInfo>(key));
          return *result.iterator->value;
      }
      static void removeInfo(const RenderBox& key) { infoMap().remove(&key); }
      static ShapeOutsideInfo* info(const RenderBox& key) { return infoMap().get(&key); }
  
  private:
      std::unique_ptr<Shape> createShapeForImage(StyleImage*, float shapeImageThreshold, WritingMode, float margin) const;
  
      LayoutUnit logicalTopOffset() const;
      LayoutUnit logicalLeftOffset() const;
  
      typedef HashMap<const RenderBox*, std::unique_ptr<ShapeOutsideInfo>> InfoMap;
      static InfoMap& infoMap()
      {
          static NeverDestroyed<InfoMap> staticInfoMap;
          return staticInfoMap;
      }
  
      const RenderBox& m_renderer;
  
      mutable std::unique_ptr<Shape> m_shape;
      LayoutSize m_referenceBoxLogicalSize;
  
      ShapeOutsideDeltas m_shapeOutsideDeltas;
  };
  
  }
  