/****************************************************************************

**

** Copyright (C) 2016 The Qt Company Ltd.

** Contact: https://www.qt.io/licensing/

**

** This file is part of the QtGui module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

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** accordance with the commercial license agreement provided with the

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** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 3 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL3 included in the

** packaging of this file. Please review the following information to

** ensure the GNU Lesser General Public License version 3 requirements

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** Alternatively, this file may be used under the terms of the GNU

** General Public License version 2.0 or (at your option) the GNU General

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****************************************************************************/

#ifndef QSTROKER_P_H

#define QSTROKER_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <QtGui/private/qtguiglobal_p.h>

#include "QtGui/qpainterpath.h"

#include "private/qdatabuffer_p.h"

#include "private/qnumeric_p.h"

QT_BEGIN_NAMESPACE

// #define QFIXED_IS_26_6

#if defined QFIXED_IS_26_6

typedef int qfixed;

#define qt_real_to_fixed(real) qfixed(real * 64)

#define qt_int_to_fixed(real) qfixed(int(real) << 6)

#define qt_fixed_to_real(fixed) qreal(fixed / qreal(64))

#define qt_fixed_to_int(fixed) int(fixed >> 6)

struct qfixed2d

{

    qfixed x;

    qfixed y;

    bool operator==(const qfixed2d &other) const { return x == other.x && y == other.y; }

};

#elif defined QFIXED_IS_32_32

typedef qint64 qfixed;

#define qt_real_to_fixed(real) qfixed(real * double(qint64(1) << 32))

#define qt_fixed_to_real(fixed) qreal(fixed / double(qint64(1) << 32))

struct qfixed2d

{

    qfixed x;

    qfixed y;

    bool operator==(const qfixed2d &other) const { return x == other.x && y == other.y; }

};

#elif defined QFIXED_IS_16_16

typedef int qfixed;

#define qt_real_to_fixed(real) qfixed(real * qreal(1 << 16))

#define qt_fixed_to_real(fixed) qreal(fixed / qreal(1 << 16))

struct qfixed2d

{

    qfixed x;

    qfixed y;

    bool operator==(const qfixed2d &other) const { return x == other.x && y == other.y; }

};

#else

typedef qreal qfixed;

#define qt_real_to_fixed(real) qfixed(real)

#define qt_fixed_to_real(fixed) fixed

struct qfixed2d

{

    qfixed x;

    qfixed y;

    bool isFinite() { return qIsFinite(x) && qIsFinite(y); }

    bool operator==(const qfixed2d &other) const { return qFuzzyCompare(x, other.x)

                                                       && qFuzzyCompare(y, other.y); }

};

#endif

#define QT_PATH_KAPPA 0.5522847498

QPointF qt_curves_for_arc(const QRectF &rect, qreal startAngle, qreal sweepLength,

                          QPointF *controlPoints, int *point_count);

qreal qt_t_for_arc_angle(qreal angle);

typedef void (*qStrokerMoveToHook)(qfixed x, qfixed y, void *data);

typedef void (*qStrokerLineToHook)(qfixed x, qfixed y, void *data);

typedef void (*qStrokerCubicToHook)(qfixed c1x, qfixed c1y,

                                    qfixed c2x, qfixed c2y,

                                    qfixed ex, qfixed ey,

                                    void *data);

// qtransform.cpp

Q_GUI_EXPORT bool qt_scaleForTransform(const QTransform &transform, qreal *scale);

class Q_GUI_EXPORT QStrokerOps

{

public:

    struct Element {

        QPainterPath::ElementType type;

        qfixed x;

        qfixed y;

        inline bool isMoveTo() const { return type == QPainterPath::MoveToElement; }

        inline bool isLineTo() const { return type == QPainterPath::LineToElement; }

        inline bool isCurveTo() const { return type == QPainterPath::CurveToElement; }

        operator qfixed2d () { qfixed2d pt = { x, y }; return pt; }

    };

    QStrokerOps();

    virtual ~QStrokerOps();

    void setMoveToHook(qStrokerMoveToHook moveToHook) { m_moveTo = moveToHook; }

    void setLineToHook(qStrokerLineToHook lineToHook) { m_lineTo = lineToHook; }

    void setCubicToHook(qStrokerCubicToHook cubicToHook) { m_cubicTo = cubicToHook; }

    virtual void begin(void *customData);

    virtual void end();

    inline void moveTo(qfixed x, qfixed y);

    inline void lineTo(qfixed x, qfixed y);

    inline void cubicTo(qfixed x1, qfixed y1, qfixed x2, qfixed y2, qfixed ex, qfixed ey);

    void strokePath(const QPainterPath &path, void *data, const QTransform &matrix);

    void strokePolygon(const QPointF *points, int pointCount, bool implicit_close,

                       void *data, const QTransform &matrix);

    void strokeEllipse(const QRectF &ellipse, void *data, const QTransform &matrix);

    QRectF clipRect() const { return m_clip_rect; }

    void setClipRect(const QRectF &clip) { m_clip_rect = clip; }

    void setCurveThresholdFromTransform(const QTransform &transform)

    {

        qreal scale;

        qt_scaleForTransform(transform, &scale);

        m_dashThreshold = scale == 0 ? qreal(0.5) : (qreal(0.5) / scale);

    }

    void setCurveThreshold(qfixed threshold) { m_curveThreshold = threshold; }

    qfixed curveThreshold() const { return m_curveThreshold; }

protected:

    inline void emitMoveTo(qfixed x, qfixed y);

    inline void emitLineTo(qfixed x, qfixed y);

    inline void emitCubicTo(qfixed c1x, qfixed c1y, qfixed c2x, qfixed c2y, qfixed ex, qfixed ey);

    virtual void processCurrentSubpath() = 0;

    QDataBuffer<Element> m_elements;

    QRectF m_clip_rect;

    qfixed m_curveThreshold;

    qfixed m_dashThreshold;

    void *m_customData;

    qStrokerMoveToHook m_moveTo;

    qStrokerLineToHook m_lineTo;

    qStrokerCubicToHook m_cubicTo;

};

class Q_GUI_EXPORT QStroker : public QStrokerOps

{

public:

    enum LineJoinMode {

        FlatJoin,

        SquareJoin,

        MiterJoin,

        RoundJoin,

        RoundCap,

        SvgMiterJoin

    };

    QStroker();

    ~QStroker();

    void setStrokeWidth(qfixed width)

    {

        m_strokeWidth = width;

        m_curveThreshold = qt_real_to_fixed(qBound(0.00025, 1.0 / qt_fixed_to_real(width), 0.25));

    }

    qfixed strokeWidth() const { return m_strokeWidth; }

    void setCapStyle(Qt::PenCapStyle capStyle) { m_capStyle = joinModeForCap(capStyle); }

    Qt::PenCapStyle capStyle() const { return capForJoinMode(m_capStyle); }

    LineJoinMode capStyleMode() const { return m_capStyle; }

    void setJoinStyle(Qt::PenJoinStyle style) { m_joinStyle = joinModeForJoin(style); }

    Qt::PenJoinStyle joinStyle() const { return joinForJoinMode(m_joinStyle); }

    LineJoinMode joinStyleMode() const { return m_joinStyle; }

    void setMiterLimit(qfixed length) { m_miterLimit = length; }

    qfixed miterLimit() const { return m_miterLimit; }

    void setForceOpen(bool state) { m_forceOpen = state; }

    bool forceOpen() { return m_forceOpen; }

    void joinPoints(qfixed x, qfixed y, const QLineF &nextLine, LineJoinMode join);

    inline void emitMoveTo(qfixed x, qfixed y);

    inline void emitLineTo(qfixed x, qfixed y);

    inline void emitCubicTo(qfixed c1x, qfixed c1y, qfixed c2x, qfixed c2y, qfixed ex, qfixed ey);

protected:

    static Qt::PenCapStyle capForJoinMode(LineJoinMode mode);

    static LineJoinMode joinModeForCap(Qt::PenCapStyle);

    static Qt::PenJoinStyle joinForJoinMode(LineJoinMode mode);

    static LineJoinMode joinModeForJoin(Qt::PenJoinStyle joinStyle);

    void processCurrentSubpath() override;

    qfixed m_strokeWidth;

    qfixed m_miterLimit;

    LineJoinMode m_capStyle;

    LineJoinMode m_joinStyle;

    qfixed m_back1X;

    qfixed m_back1Y;

    qfixed m_back2X;

    qfixed m_back2Y;

    bool m_forceOpen;

};

class Q_GUI_EXPORT QDashStroker : public QStrokerOps

{

public:

    QDashStroker(QStroker *stroker);

    ~QDashStroker();

    QStroker *stroker() const { return m_stroker; }

    static QVector<qfixed> patternForStyle(Qt::PenStyle style);

    static int repetitionLimit() { return 10000; }

    void setDashPattern(const QVector<qfixed> &dashPattern) { m_dashPattern = dashPattern; }

    QVector<qfixed> dashPattern() const { return m_dashPattern; }

    void setDashOffset(qreal offset) { m_dashOffset = offset; }

    qreal dashOffset() const { return m_dashOffset; }

    void begin(void *data) override;

    void end() override;

    inline void setStrokeWidth(qreal width) { m_stroke_width = width; }

    inline void setMiterLimit(qreal limit) { m_miter_limit = limit; }

protected:

    void processCurrentSubpath() override;

    QStroker *m_stroker;

    QVector<qfixed> m_dashPattern;

    qreal m_dashOffset;

    qreal m_stroke_width;

    qreal m_miter_limit;

};

/*******************************************************************************

 * QStrokerOps inline membmers

 */

inline void QStrokerOps::emitMoveTo(qfixed x, qfixed y)

{

    Q_ASSERT(m_moveTo);

    m_moveTo(x, y, m_customData);

}

inline void QStrokerOps::emitLineTo(qfixed x, qfixed y)

{

    Q_ASSERT(m_lineTo);

    m_lineTo(x, y, m_customData);

}

inline void QStrokerOps::emitCubicTo(qfixed c1x, qfixed c1y, qfixed c2x, qfixed c2y, qfixed ex, qfixed ey)

{

    Q_ASSERT(m_cubicTo);

    m_cubicTo(c1x, c1y, c2x, c2y, ex, ey, m_customData);

}

inline void QStrokerOps::moveTo(qfixed x, qfixed y)

{

    if (m_elements.size()>1)

        processCurrentSubpath();

    m_elements.reset();

    Element e = { QPainterPath::MoveToElement, x, y };

    m_elements.add(e);

}

inline void QStrokerOps::lineTo(qfixed x, qfixed y)

{

    Element e = { QPainterPath::LineToElement, x, y };

    m_elements.add(e);

}

inline void QStrokerOps::cubicTo(qfixed x1, qfixed y1, qfixed x2, qfixed y2, qfixed ex, qfixed ey)

{

    Element c1 = { QPainterPath::CurveToElement, x1, y1 };

    Element c2 = { QPainterPath::CurveToDataElement, x2, y2 };

    Element e = { QPainterPath::CurveToDataElement, ex, ey };

    m_elements.add(c1);

    m_elements.add(c2);

    m_elements.add(e);

}

/*******************************************************************************

 * QStroker inline members

 */

inline void QStroker::emitMoveTo(qfixed x, qfixed y)

{

    m_back2X = m_back1X;

    m_back2Y = m_back1Y;

    m_back1X = x;

    m_back1Y = y;

    QStrokerOps::emitMoveTo(x, y);

}

inline void QStroker::emitLineTo(qfixed x, qfixed y)

{

    m_back2X = m_back1X;

    m_back2Y = m_back1Y;

    m_back1X = x;

    m_back1Y = y;

    QStrokerOps::emitLineTo(x, y);

}

inline void QStroker::emitCubicTo(qfixed c1x, qfixed c1y,

                                  qfixed c2x, qfixed c2y,

                                  qfixed ex, qfixed ey)

{

    if (c2x == ex && c2y == ey) {

        if (c1x == ex && c1y == ey) {

            m_back2X = m_back1X;

            m_back2Y = m_back1Y;

        } else {

            m_back2X = c1x;

            m_back2Y = c1y;

        }

    } else {

        m_back2X = c2x;

        m_back2Y = c2y;

    }

    m_back1X = ex;

    m_back1Y = ey;

    QStrokerOps::emitCubicTo(c1x, c1y, c2x, c2y, ex, ey);

}

/*******************************************************************************

 * QDashStroker inline members

 */

inline void QDashStroker::begin(void *data)

{

    if (m_stroker)

        m_stroker->begin(data);

    QStrokerOps::begin(data);

}

inline void QDashStroker::end()

{

    QStrokerOps::end();

    if (m_stroker)

        m_stroker->end();

}

QT_END_NAMESPACE

#endif // QSTROKER_P_H