PolygonShape.h   [plain text]

/*
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 */

#pragma once

#include "FloatPolygon.h"
#include "Shape.h"
#include "ShapeInterval.h"

namespace WebCore {

class OffsetPolygonEdge final : public VertexPair {
public:
    OffsetPolygonEdge(const FloatPolygonEdge& edge, const FloatSize& offset)
        : m_vertex1(edge.vertex1() + offset)
        , m_vertex2(edge.vertex2() + offset)
    {
    }

    const FloatPoint& vertex1() const override { return m_vertex1; }
    const FloatPoint& vertex2() const override { return m_vertex2; }

    bool isWithinYRange(float y1, float y2) const { return y1 <= minY() && y2 >= maxY(); }
    bool overlapsYRange(float y1, float y2) const { return y2 >= minY() && y1 <= maxY(); }
    float xIntercept(float y) const;
    FloatShapeInterval clippedEdgeXRange(float y1, float y2) const;

private:
    FloatPoint m_vertex1;
    FloatPoint m_vertex2;
};

class PolygonShape : public Shape {
    WTF_MAKE_NONCOPYABLE(PolygonShape);
public:
    PolygonShape(std::unique_ptr<Vector<FloatPoint>> vertices, WindRule fillRule)
        : m_polygon(WTFMove(vertices), fillRule)
    {
    }

    LayoutRect shapeMarginLogicalBoundingBox() const override;
    bool isEmpty() const override { return m_polygon.isEmpty(); }
    LineSegment getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const override;

    void buildDisplayPaths(DisplayPaths&) const override;

private:
    FloatPolygon m_polygon;
};

} // namespace WebCore