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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 HOLDERS AND CONTRIBUTORS
     17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     19  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     20  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     21  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     25  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     27  * OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #ifndef PolygonShape_h
     31 #define PolygonShape_h
     32 
     33 #include "core/platform/graphics/FloatPolygon.h"
     34 #include "core/rendering/shapes/Shape.h"
     35 #include "core/rendering/shapes/ShapeInterval.h"
     36 
     37 namespace WebCore {
     38 
     39 class OffsetPolygonEdge : public VertexPair {
     40 public:
     41     enum Basis {
     42         Edge,
     43         Vertex,
     44         LineTop
     45     };
     46 
     47     OffsetPolygonEdge(const FloatPolygonEdge& edge, const FloatSize& offset)
     48         : m_vertex1(edge.vertex1() + offset)
     49         , m_vertex2(edge.vertex2() + offset)
     50         , m_edgeIndex(edge.edgeIndex())
     51         , m_basis(Edge)
     52     {
     53     }
     54 
     55     OffsetPolygonEdge(const FloatPoint& reflexVertex, const FloatSize& offset1, const FloatSize& offset2)
     56         : m_vertex1(reflexVertex + offset1)
     57         , m_vertex2(reflexVertex + offset2)
     58         , m_edgeIndex(-1)
     59         , m_basis(Vertex)
     60     {
     61     }
     62 
     63     OffsetPolygonEdge(const FloatPolygon& polygon, float minLogicalIntervalTop, const FloatSize& offset)
     64         : m_vertex1(FloatPoint(polygon.boundingBox().x(), minLogicalIntervalTop) + offset)
     65         , m_vertex2(FloatPoint(polygon.boundingBox().maxX(), minLogicalIntervalTop) + offset)
     66         , m_edgeIndex(-1)
     67         , m_basis(LineTop)
     68     {
     69     }
     70 
     71     virtual const FloatPoint& vertex1() const OVERRIDE { return m_vertex1; }
     72     virtual const FloatPoint& vertex2() const OVERRIDE { return m_vertex2; }
     73     int edgeIndex() const { return m_edgeIndex; }
     74     Basis basis() const { return m_basis; }
     75 
     76 private:
     77     FloatPoint m_vertex1;
     78     FloatPoint m_vertex2;
     79     int m_edgeIndex;
     80     Basis m_basis;
     81 };
     82 
     83 class PolygonShape : public Shape {
     84     WTF_MAKE_NONCOPYABLE(PolygonShape);
     85 public:
     86     PolygonShape(PassOwnPtr<Vector<FloatPoint> > vertices, WindRule fillRule)
     87         : Shape()
     88         , m_polygon(vertices, fillRule)
     89         , m_marginBounds(nullptr)
     90         , m_paddingBounds(nullptr)
     91     {
     92     }
     93 
     94     virtual LayoutRect shapeMarginLogicalBoundingBox() const OVERRIDE { return static_cast<LayoutRect>(shapeMarginBounds().boundingBox()); }
     95     virtual LayoutRect shapePaddingLogicalBoundingBox() const OVERRIDE { return static_cast<LayoutRect>(shapePaddingBounds().boundingBox()); }
     96     virtual bool isEmpty() const OVERRIDE { return m_polygon.isEmpty(); }
     97     virtual void getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const OVERRIDE;
     98     virtual void getIncludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const OVERRIDE;
     99     virtual bool firstIncludedIntervalLogicalTop(LayoutUnit minLogicalIntervalTop, const LayoutSize& minLogicalIntervalSize, LayoutUnit&) const OVERRIDE;
    100 
    101 private:
    102     const FloatPolygon& shapeMarginBounds() const;
    103     const FloatPolygon& shapePaddingBounds() const;
    104 
    105     FloatPolygon m_polygon;
    106     mutable OwnPtr<FloatPolygon> m_marginBounds;
    107     mutable OwnPtr<FloatPolygon> m_paddingBounds;
    108 };
    109 
    110 } // namespace WebCore
    111 
    112 #endif // PolygonShape_h
    113