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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/rendering/shapes/Shape.h"
     34 #include "platform/geometry/FloatPolygon.h"
     35 
     36 namespace WebCore {
     37 
     38 class OffsetPolygonEdge : public VertexPair {
     39 public:
     40     enum Basis {
     41         Edge,
     42         Vertex,
     43         LineTop
     44     };
     45 
     46     OffsetPolygonEdge(const FloatPolygonEdge& edge, const FloatSize& offset)
     47         : m_vertex1(edge.vertex1() + offset)
     48         , m_vertex2(edge.vertex2() + offset)
     49         , m_edgeIndex(edge.edgeIndex())
     50         , m_basis(Edge)
     51     {
     52     }
     53 
     54     OffsetPolygonEdge(const FloatPoint& reflexVertex, const FloatSize& offset1, const FloatSize& offset2)
     55         : m_vertex1(reflexVertex + offset1)
     56         , m_vertex2(reflexVertex + offset2)
     57         , m_edgeIndex(-1)
     58         , m_basis(Vertex)
     59     {
     60     }
     61 
     62     OffsetPolygonEdge(const FloatPolygon& polygon, float minLogicalIntervalTop, const FloatSize& offset)
     63         : m_vertex1(FloatPoint(polygon.boundingBox().x(), minLogicalIntervalTop) + offset)
     64         , m_vertex2(FloatPoint(polygon.boundingBox().maxX(), minLogicalIntervalTop) + offset)
     65         , m_edgeIndex(-1)
     66         , m_basis(LineTop)
     67     {
     68     }
     69 
     70     virtual const FloatPoint& vertex1() const OVERRIDE { return m_vertex1; }
     71     virtual const FloatPoint& vertex2() const OVERRIDE { return m_vertex2; }
     72     int edgeIndex() const { return m_edgeIndex; }
     73     Basis basis() const { return m_basis; }
     74 
     75 private:
     76     FloatPoint m_vertex1;
     77     FloatPoint m_vertex2;
     78     int m_edgeIndex;
     79     Basis m_basis;
     80 };
     81 
     82 class PolygonShape : public Shape {
     83     WTF_MAKE_NONCOPYABLE(PolygonShape);
     84 public:
     85     PolygonShape(PassOwnPtr<Vector<FloatPoint> > vertices, WindRule fillRule)
     86         : Shape()
     87         , m_polygon(vertices, fillRule)
     88         , m_marginBounds(nullptr)
     89         , m_paddingBounds(nullptr)
     90     {
     91     }
     92 
     93     virtual LayoutRect shapeMarginLogicalBoundingBox() const OVERRIDE { return static_cast<LayoutRect>(shapeMarginBounds().boundingBox()); }
     94     virtual LayoutRect shapePaddingLogicalBoundingBox() const OVERRIDE { return static_cast<LayoutRect>(shapePaddingBounds().boundingBox()); }
     95     virtual bool isEmpty() const OVERRIDE { return m_polygon.isEmpty(); }
     96     virtual void getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const OVERRIDE;
     97     virtual void getIncludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const OVERRIDE;
     98     virtual bool firstIncludedIntervalLogicalTop(LayoutUnit minLogicalIntervalTop, const LayoutSize& minLogicalIntervalSize, LayoutUnit&) const OVERRIDE;
     99 
    100 private:
    101     const FloatPolygon& shapeMarginBounds() const;
    102     const FloatPolygon& shapePaddingBounds() const;
    103 
    104     FloatPolygon m_polygon;
    105     mutable OwnPtr<FloatPolygon> m_marginBounds;
    106     mutable OwnPtr<FloatPolygon> m_paddingBounds;
    107 };
    108 
    109 } // namespace WebCore
    110 
    111 #endif // PolygonShape_h
    112