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