// Copyright (C) 2016 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 QPAINTER_P_H

#define QPAINTER_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 <QtCore/qvarlengtharray.h>

#include <QtGui/private/qtguiglobal_p.h>

#include "QtGui/qbrush.h"

#include "QtGui/qcolorspace.h"

#include "QtGui/qcolortransform.h"

#include "QtGui/qfont.h"

#include "QtGui/qpen.h"

#include "QtGui/qregion.h"

#include "QtGui/qpainter.h"

#include "QtGui/qpainterpath.h"

#include "QtGui/qpaintengine.h"

#include <private/qpen_p.h>

#include <memory>

#include <stack>

QT_BEGIN_NAMESPACE

class QPaintEngine;

class QEmulationPaintEngine;

class QPaintEngineEx;

struct QFixedPoint;

struct QTLWExtra;

struct DataPtrContainer {

    void *ptr;

};

inline const void *data_ptr(const QTransform &t) { return (const DataPtrContainer *) &t; }

inline bool qtransform_fast_equals(const QTransform &a, const QTransform &b) { return data_ptr(a) == data_ptr(b); }

// QPen inline functions...

inline QPen::DataPtr &data_ptr(const QPen &p) { return const_cast<QPen &>(p).data_ptr(); }

inline bool qpen_fast_equals(const QPen &a, const QPen &b) { return data_ptr(a) == data_ptr(b); }

inline QBrush qpen_brush(const QPen &p) { return data_ptr(p)->brush; }

inline qreal qpen_widthf(const QPen &p) { return data_ptr(p)->width; }

inline Qt::PenStyle qpen_style(const QPen &p) { return data_ptr(p)->style; }

inline Qt::PenCapStyle qpen_capStyle(const QPen &p) { return data_ptr(p)->capStyle; }

inline Qt::PenJoinStyle qpen_joinStyle(const QPen &p) { return data_ptr(p)->joinStyle; }

// QBrush inline functions...

inline QBrush::DataPtr &data_ptr(const QBrush &p) { return const_cast<QBrush &>(p).data_ptr(); }

inline bool qbrush_fast_equals(const QBrush &a, const QBrush &b) { return data_ptr(a) == data_ptr(b); }

inline Qt::BrushStyle qbrush_style(const QBrush &b) { return data_ptr(b)->style; }

inline const QColor &qbrush_color(const QBrush &b) { return data_ptr(b)->color; }

inline bool qbrush_has_transform(const QBrush &b) { return data_ptr(b)->transform.type() > QTransform::TxNone; }

class QPainterClipInfo

{

public:

    QPainterClipInfo() { } // for QList, don't use

    enum ClipType { RegionClip, PathClip, RectClip, RectFClip };

    QPainterClipInfo(const QPainterPath &p, Qt::ClipOperation op, const QTransform &m) :

        clipType(PathClip), matrix(m), operation(op), path(p) { }

    QPainterClipInfo(const QRegion &r, Qt::ClipOperation op, const QTransform &m) :

        clipType(RegionClip), matrix(m), operation(op), region(r) { }

    QPainterClipInfo(const QRect &r, Qt::ClipOperation op, const QTransform &m) :

        clipType(RectClip), matrix(m), operation(op), rect(r) { }

    QPainterClipInfo(const QRectF &r, Qt::ClipOperation op, const QTransform &m) :

        clipType(RectFClip), matrix(m), operation(op), rectf(r) { }

    ClipType clipType;

    QTransform matrix;

    Qt::ClipOperation operation;

    QPainterPath path;

    QRegion region;

    QRect rect;

    QRectF rectf;

    // ###

//     union {

//         QRegionData *d;

//         QPainterPathPrivate *pathData;

//         struct {

//             int x, y, w, h;

//         } rectData;

//         struct {

//             qreal x, y, w, h;

//         } rectFData;

//     };

};

Q_DECLARE_TYPEINFO(QPainterClipInfo, Q_RELOCATABLE_TYPE);

class Q_GUI_EXPORT QPainterState : public QPaintEngineState

{

public:

    QPainterState();

    QPainterState(const QPainterState *s);

    virtual ~QPainterState();

    void init(QPainter *p);

    QPointF brushOrigin;

    QFont font;

    QFont deviceFont;

    QPen pen;

    QBrush brush;

    QBrush bgBrush = Qt::white; // background brush

    QRegion clipRegion;

    QPainterPath clipPath;

    Qt::ClipOperation clipOperation = Qt::NoClip;

    QPainter::RenderHints renderHints;

    QList<QPainterClipInfo> clipInfo; // ### Make me smaller and faster to copy around...

    QTransform worldMatrix;       // World transformation matrix, not window and viewport

    QTransform matrix;            // Complete transformation matrix,

    QTransform redirectionMatrix;

    int wx = 0, wy = 0, ww = 0, wh = 0; // window rectangle

    int vx = 0, vy = 0, vw = 0, vh = 0; // viewport rectangle

    qreal opacity = 1;

    uint WxF:1;                 // World transformation

    uint VxF:1;                 // View transformation

    uint clipEnabled:1;

    Qt::BGMode bgMode = Qt::TransparentMode;

    QPainter *painter = nullptr;

    Qt::LayoutDirection layoutDirection;

    QPainter::CompositionMode composition_mode = QPainter::CompositionMode_SourceOver;

    uint emulationSpecifier = 0;

    uint changeFlags = 0;

};

struct QPainterDummyState

{

    QFont font;

    QPen pen;

    QBrush brush;

    QTransform transform;

};

class QRawFont;

class QPainterPrivate

{

    Q_DECLARE_PUBLIC(QPainter)

public:

    explicit QPainterPrivate(QPainter *painter);

    ~QPainterPrivate();

    QPainter *q_ptr;

    // Allocate space for 4 d-pointers (enough for up to 4 sub-sequent

    // redirections within the same paintEvent(), which should be enough

    // in 99% of all cases). E.g: A renders B which renders C which renders D.

    static constexpr qsizetype NDPtrs = 4;

    QVarLengthArray<std::unique_ptr<QPainterPrivate>, NDPtrs> d_ptrs;

    std::unique_ptr<QPainterState> state;

    template <typename T, std::size_t N = 8>

    struct SmallStack : std::stack<T, QVarLengthArray<T, N>> {

        void clear() { this->c.clear(); }

    };

    SmallStack<std::unique_ptr<QPainterState>> savedStates;

    mutable std::unique_ptr<QPainterDummyState> dummyState;

    QTransform invMatrix;

    uint txinv:1;

    uint inDestructor : 1;

    uint refcount = 1;

    enum DrawOperation { StrokeDraw        = 0x1,

                         FillDraw          = 0x2,

                         StrokeAndFillDraw = 0x3

    };

    QPainterDummyState *fakeState() const {

        if (!dummyState)

            dummyState = std::make_unique<QPainterDummyState>();

        return dummyState.get();

    }

    void updateEmulationSpecifier(QPainterState *s);

    void updateStateImpl(QPainterState *state);

    void updateState(QPainterState *state);

    void updateState(std::unique_ptr<QPainterState> &state) { updateState(state.get()); }

    void draw_helper(const QPainterPath &path, DrawOperation operation = StrokeAndFillDraw);

    void drawStretchedGradient(const QPainterPath &path, DrawOperation operation);

    void drawOpaqueBackground(const QPainterPath &path, DrawOperation operation);

    void drawTextItem(const QPointF &p, const QTextItem &_ti, QTextEngine *textEngine);

#if !defined(QT_NO_RAWFONT)

    void drawGlyphs(const QPointF &decorationPosition, const quint32 *glyphArray, QFixedPoint *positionArray, int glyphCount,

                    QFontEngine *fontEngine, bool overline = false, bool underline = false,

                    bool strikeOut = false);

#endif

    void updateMatrix();

    void updateInvMatrix();

    void checkEmulation();

    static QPainterPrivate *get(QPainter *painter)

    {

        return painter->d_ptr.get();

    }

    QTransform viewTransform() const;

    qreal effectiveDevicePixelRatio() const;

    QTransform hidpiScaleTransform() const;

    static bool attachPainterPrivate(QPainter *q, QPaintDevice *pdev);

    void detachPainterPrivate(QPainter *q);

    void initFrom(const QPaintDevice *device);

    QPaintDevice *device = nullptr;

    QPaintDevice *original_device = nullptr;

    QPaintDevice *helper_device = nullptr;

    struct QPaintEngineDestructor {

        void operator()(QPaintEngine *pe) const noexcept

        {

            if (pe && pe->autoDestruct())

                delete pe;

        }

    };

    std::unique_ptr<QPaintEngine, QPaintEngineDestructor> engine;

    std::unique_ptr<QEmulationPaintEngine> emulationEngine;

    QPaintEngineEx *extended = nullptr;

    QBrush colorBrush;          // for fill with solid color

};

Q_GUI_EXPORT void qt_draw_helper(QPainterPrivate *p, const QPainterPath &path, QPainterPrivate::DrawOperation operation);

QString qt_generate_brush_key(const QBrush &brush);

QT_END_NAMESPACE

#endif // QPAINTER_P_H