qtessellator_p.h

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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QTESSELATOR_P_H
#define QTESSELATOR_P_H
 
#include <QPoint>
#include <QRect>
 
QT_BEGIN_NAMESPACE
 
class QTessellatorPrivate;
 
typedef int Q27Dot5;
#define Q27Dot5ToDouble(i) ((i)/32.)
#define FloatToQ27Dot5(i) (int)((i) * 32)
#define IntToQ27Dot5(i) ((i) << 5)
#define Q27Dot5ToXFixed(i) ((i) << 11)
#define Q27Dot5Factor 32
 
class QTessellator {
public:
    QTessellator();
    virtual ~QTessellator();
 
    QRectF tessellate(const QPointF *points, int nPoints);
    void tessellateConvex(const QPointF *points, int nPoints);
    void tessellateRect(const QPointF &a, const QPointF &b, qreal width);
 
    void setWinding(bool w);
 
    struct Vertex {
        Q27Dot5 x;
        Q27Dot5 y;
    };
    struct Trapezoid {
        Q27Dot5 top;
        Q27Dot5 bottom;
        const Vertex *topLeft;
        const Vertex *bottomLeft;
        const Vertex *topRight;
        const Vertex *bottomRight;
    };
    virtual void addTrap(const Trapezoid &trap) = 0;
 
private:
    friend class QTessellatorPrivate;
    QTessellatorPrivate *d;
};
 
QT_END_NAMESPACE
 
#endif