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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 "core/rendering/shapes/ShapeInterval.h"
     35 #include "platform/geometry/FloatPolygon.h"
     36 
     37 namespace blink {
     38 
     39 class OffsetPolygonEdge FINAL : public VertexPair {
     40 public:
     41     OffsetPolygonEdge(const FloatPolygonEdge& edge, const FloatSize& offset)
     42         : m_vertex1(edge.vertex1() + offset)
     43         , m_vertex2(edge.vertex2() + offset)
     44     {
     45     }
     46 
     47     virtual const FloatPoint& vertex1() const OVERRIDE { return m_vertex1; }
     48     virtual const FloatPoint& vertex2() const OVERRIDE { return m_vertex2; }
     49 
     50     bool isWithinYRange(float y1, float y2) const { return y1 <= minY() && y2 >= maxY(); }
     51     bool overlapsYRange(float y1, float y2) const { return y2 >= minY() && y1 <= maxY(); }
     52     float xIntercept(float y) const;
     53     FloatShapeInterval clippedEdgeXRange(float y1, float y2) const;
     54 
     55 private:
     56     FloatPoint m_vertex1;
     57     FloatPoint m_vertex2;
     58 };
     59 
     60 class PolygonShape FINAL : public Shape {
     61     WTF_MAKE_NONCOPYABLE(PolygonShape);
     62 public:
     63     PolygonShape(PassOwnPtr<Vector<FloatPoint> > vertices, WindRule fillRule)
     64         : Shape()
     65         , m_polygon(vertices, fillRule)
     66     {
     67     }
     68 
     69     virtual LayoutRect shapeMarginLogicalBoundingBox() const OVERRIDE;
     70     virtual bool isEmpty() const OVERRIDE { return m_polygon.isEmpty(); }
     71     virtual LineSegment getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const OVERRIDE;
     72     virtual void buildDisplayPaths(DisplayPaths&) const OVERRIDE;
     73 
     74 private:
     75     FloatPolygon m_polygon;
     76 };
     77 
     78 } // namespace blink
     79 
     80 #endif // PolygonShape_h
     81