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      1 /*
      2  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1. Redistributions of source code must retain the above
      9  *    copyright notice, this list of conditions and the following
     10  *    disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above
     12  *    copyright notice, this list of conditions and the following
     13  *    disclaimer in the documentation and/or other materials
     14  *    provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AS IS AND ANY
     17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
     20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
     21  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     23  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     25  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
     26  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #ifndef ShapeOutsideInfo_h
     31 #define ShapeOutsideInfo_h
     32 
     33 #include "core/rendering/shapes/Shape.h"
     34 #include "core/rendering/style/RenderStyle.h"
     35 #include "core/rendering/style/ShapeValue.h"
     36 #include "platform/geometry/FloatRect.h"
     37 #include "platform/geometry/LayoutSize.h"
     38 #include "wtf/OwnPtr.h"
     39 #include "wtf/Vector.h"
     40 
     41 namespace WebCore {
     42 
     43 class RenderBlockFlow;
     44 class RenderBox;
     45 class FloatingObject;
     46 
     47 class ShapeOutsideInfo FINAL {
     48     WTF_MAKE_FAST_ALLOCATED;
     49 public:
     50     void setReferenceBoxLogicalSize(LayoutSize);
     51 
     52     SegmentList computeSegmentsForLine(LayoutUnit lineTop, LayoutUnit lineHeight) const;
     53 
     54     LayoutUnit shapeLogicalTop() const { return computedShape().shapeMarginLogicalBoundingBox().y() + logicalTopOffset(); }
     55     LayoutUnit shapeLogicalBottom() const { return computedShape().shapeMarginLogicalBoundingBox().maxY() + logicalTopOffset(); }
     56     LayoutUnit shapeLogicalLeft() const { return computedShape().shapeMarginLogicalBoundingBox().x() + logicalLeftOffset(); }
     57     LayoutUnit shapeLogicalRight() const { return computedShape().shapeMarginLogicalBoundingBox().maxX() + logicalLeftOffset(); }
     58     LayoutUnit shapeLogicalWidth() const { return computedShape().shapeMarginLogicalBoundingBox().width(); }
     59     LayoutUnit shapeLogicalHeight() const { return computedShape().shapeMarginLogicalBoundingBox().height(); }
     60 
     61     LayoutUnit logicalLineTop() const { return m_referenceBoxLineTop + logicalTopOffset(); }
     62     LayoutUnit logicalLineBottom() const { return m_referenceBoxLineTop + m_lineHeight + logicalTopOffset(); }
     63 
     64     LayoutUnit leftMarginBoxDelta() const { return m_leftMarginBoxDelta; }
     65     LayoutUnit rightMarginBoxDelta() const { return m_rightMarginBoxDelta; }
     66     bool lineOverlapsShape() const { return m_lineOverlapsShape; }
     67 
     68     static PassOwnPtr<ShapeOutsideInfo> createInfo(const RenderBox& renderer) { return adoptPtr(new ShapeOutsideInfo(renderer)); }
     69     static bool isEnabledFor(const RenderBox&);
     70     void updateDeltasForContainingBlockLine(const RenderBlockFlow&, const FloatingObject&, LayoutUnit lineTop, LayoutUnit lineHeight);
     71 
     72     bool lineOverlapsShapeBounds() const
     73     {
     74         return computedShape().lineOverlapsShapeMarginBounds(m_referenceBoxLineTop, m_lineHeight);
     75     }
     76 
     77     static ShapeOutsideInfo& ensureInfo(const RenderBox& key)
     78     {
     79         InfoMap& infoMap = ShapeOutsideInfo::infoMap();
     80         if (ShapeOutsideInfo* info = infoMap.get(&key))
     81             return *info;
     82         InfoMap::AddResult result = infoMap.add(&key, ShapeOutsideInfo::createInfo(key));
     83         return *result.storedValue->value;
     84     }
     85     static void removeInfo(const RenderBox& key) { infoMap().remove(&key); }
     86     static ShapeOutsideInfo* info(const RenderBox& key) { return infoMap().get(&key); }
     87 
     88     void markShapeAsDirty() { m_shape.clear(); }
     89     bool isShapeDirty() { return !m_shape.get(); }
     90     LayoutSize shapeSize() const { return m_referenceBoxLogicalSize; }
     91 
     92     LayoutRect computedShapePhysicalBoundingBox() const;
     93     FloatPoint shapeToRendererPoint(FloatPoint) const;
     94     FloatSize shapeToRendererSize(FloatSize) const;
     95     const Shape& computedShape() const;
     96 
     97 protected:
     98     ShapeOutsideInfo(const RenderBox& renderer)
     99         : m_renderer(renderer)
    100         , m_lineOverlapsShape(false)
    101     { }
    102 
    103 private:
    104     PassOwnPtr<Shape> createShapeForImage(StyleImage*, float shapeImageThreshold, WritingMode, float margin) const;
    105 
    106     LayoutUnit logicalTopOffset() const;
    107     LayoutUnit logicalLeftOffset() const;
    108 
    109     typedef HashMap<const RenderBox*, OwnPtr<ShapeOutsideInfo> > InfoMap;
    110     static InfoMap& infoMap()
    111     {
    112         DEFINE_STATIC_LOCAL(InfoMap, staticInfoMap, ());
    113         return staticInfoMap;
    114     }
    115 
    116     LayoutUnit m_referenceBoxLineTop;
    117     LayoutUnit m_lineHeight;
    118 
    119     const RenderBox& m_renderer;
    120     mutable OwnPtr<Shape> m_shape;
    121     LayoutSize m_referenceBoxLogicalSize;
    122     LayoutUnit m_leftMarginBoxDelta;
    123     LayoutUnit m_rightMarginBoxDelta;
    124     LayoutUnit m_borderBoxLineTop;
    125     bool m_lineOverlapsShape;
    126 };
    127 
    128 }
    129 #endif
    130