Move FloatPolygon.* and WindRule.h to Source/platform/

Source/core/platform/graphics/FloatPolygon.h

-/*
- * 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,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef FloatPolygon_h
-#define FloatPolygon_h
-
-#include "core/platform/graphics/WindRule.h"
-#include "platform/PODIntervalTree.h"
-#include "platform/geometry/FloatPoint.h"
-#include "platform/geometry/FloatRect.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/Vector.h"
-
-namespace WebCore {
-
-class FloatPolygonEdge;
-
-// This class is used by PODIntervalTree for debugging.
-#ifndef NDEBUG
-template <class> struct ValueToString;
-#endif
-
-class FloatPolygon {
-public:
-    FloatPolygon(PassOwnPtr<Vector<FloatPoint> > vertices, WindRule fillRule);
-
-    const FloatPoint& vertexAt(unsigned index) const { return (*m_vertices)[index]; }
-    unsigned numberOfVertices() const { return m_vertices->size(); }
-
-    WindRule fillRule() const { return m_fillRule; }
-
-    const FloatPolygonEdge& edgeAt(unsigned index) const { return m_edges[index]; }
-    unsigned numberOfEdges() const { return m_edges.size(); }
-
-    FloatRect boundingBox() const { return m_boundingBox; }
-    bool overlappingEdges(float minY, float maxY, Vector<const FloatPolygonEdge*>& result) const;
-    bool contains(const FloatPoint&) const;
-    bool isEmpty() const { return m_empty; }
-
-private:
-    typedef PODInterval<float, FloatPolygonEdge*> EdgeInterval;
-    typedef PODIntervalTree<float, FloatPolygonEdge*> EdgeIntervalTree;
-
-    bool containsNonZero(const FloatPoint&) const;
-    bool containsEvenOdd(const FloatPoint&) const;
-
-    OwnPtr<Vector<FloatPoint> > m_vertices;
-    WindRule m_fillRule;
-    FloatRect m_boundingBox;
-    bool m_empty;
-    Vector<FloatPolygonEdge> m_edges;
-    EdgeIntervalTree m_edgeTree; // Each EdgeIntervalTree node stores minY, maxY, and a ("UserData") pointer to a FloatPolygonEdge.
-
-};
-
-class VertexPair {
-public:
-    virtual ~VertexPair() { }
-
-    virtual const FloatPoint& vertex1() const = 0;
-    virtual const FloatPoint& vertex2() const = 0;
-
-    float minX() const { return std::min(vertex1().x(), vertex2().x()); }
-    float minY() const { return std::min(vertex1().y(), vertex2().y()); }
-    float maxX() const { return std::max(vertex1().x(), vertex2().x()); }
-    float maxY() const { return std::max(vertex1().y(), vertex2().y()); }
-
-    bool overlapsRect(const FloatRect&) const;
-    bool intersection(const VertexPair&, FloatPoint&) const;
-};
-
-class FloatPolygonEdge : public VertexPair {
-    friend class FloatPolygon;
-public:
-    virtual const FloatPoint& vertex1() const OVERRIDE
-    {
-        ASSERT(m_polygon);
-        return m_polygon->vertexAt(m_vertexIndex1);
-    }
-
-    virtual const FloatPoint& vertex2() const OVERRIDE
-    {
-        ASSERT(m_polygon);
-        return m_polygon->vertexAt(m_vertexIndex2);
-    }
-
-    const FloatPolygonEdge& previousEdge() const
-    {
-        ASSERT(m_polygon && m_polygon->numberOfEdges() > 1);
-        return m_polygon->edgeAt((m_edgeIndex + m_polygon->numberOfEdges() - 1) % m_polygon->numberOfEdges());
-    }
-
-    const FloatPolygonEdge& nextEdge() const
-    {
-        ASSERT(m_polygon && m_polygon->numberOfEdges() > 1);
-        return m_polygon->edgeAt((m_edgeIndex + 1) % m_polygon->numberOfEdges());
-    }
-
-    const FloatPolygon* polygon() const { return m_polygon; }
-    unsigned vertexIndex1() const { return m_vertexIndex1; }
-    unsigned vertexIndex2() const { return m_vertexIndex2; }
-    unsigned edgeIndex() const { return m_edgeIndex; }
-
-private:
-    // Edge vertex index1 is less than index2, except the last edge, where index2 is 0. When a polygon edge
-    // is defined by 3 or more colinear vertices, index2 can be the the index of the last colinear vertex.
-    unsigned m_vertexIndex1;
-    unsigned m_vertexIndex2;
-    unsigned m_edgeIndex;
-    const FloatPolygon* m_polygon;
-};
-
-// These structures are used by PODIntervalTree for debugging.
-#ifndef NDEBUG
-template <> struct ValueToString<float> {
-    static String string(const float value) { return String::number(value); }
-};
-
-template<> struct ValueToString<FloatPolygonEdge*> {
-    static String string(const FloatPolygonEdge* edge) { return String::format("%p (%f,%f %f,%f)", edge, edge->vertex1().x(), edge->vertex1().y(), edge->vertex2().x(), edge->vertex2().y()); }
-};
-#endif
-
-} // namespace WebCore
-
-#endif // FloatPolygon_h