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

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

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

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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

** General Public License version 2.1 as published by the Free Software

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

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

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

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

#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 "QtGui/qbrush.h"

#include "QtGui/qfont.h"

#include "QtGui/qpen.h"

#include "QtGui/qregion.h"

#include "QtGui/qmatrix.h"

#include "QtGui/qpainter.h"

#include "QtGui/qpainterpath.h"

#include "QtGui/qpaintengine.h"

#include <QtCore/qhash.h>

#include <private/qpen_p.h>

QT_BEGIN_NAMESPACE

class QPaintEngine;

class QEmulationPaintEngine;

class QPaintEngineEx;

struct QTLWExtra;

struct DataPtrContainer {

    void *ptr;

};

inline void *data_ptr(const QTransform &t) { return (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:

    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;

//     };

};

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;             // background brush

    QRegion clipRegion;

    QPainterPath clipPath;

    Qt::ClipOperation clipOperation;

    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, wy, ww, wh;         // window rectangle

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

    qreal opacity;

    uint WxF:1;                 // World transformation

    uint VxF:1;                 // View transformation

    uint clipEnabled:1;

    Qt::BGMode bgMode;

    QPainter *painter;

    Qt::LayoutDirection layoutDirection;

    QPainter::CompositionMode composition_mode;

    uint emulationSpecifier;

    uint changeFlags;

};

struct QPainterDummyState

{

    QFont font;

    QPen pen;

    QBrush brush;

    QTransform transform;

};

class QPainterPrivate

{

    Q_DECLARE_PUBLIC(QPainter)

public:

    QPainterPrivate(QPainter *painter)

    : q_ptr(painter), d_ptrs(0), state(0), dummyState(0), txinv(0), inDestructor(false), d_ptrs_size(0),

        refcount(1), device(0), original_device(0), helper_device(0), engine(0), emulationEngine(0),

        extended(0)

    {

    }

    ~QPainterPrivate();

    QPainter *q_ptr;

    QPainterPrivate **d_ptrs;

    QPainterState *state;

    QVector<QPainterState*> states;

    mutable QPainterDummyState *dummyState;

    QTransform invMatrix;

    uint txinv:1;

    uint inDestructor : 1;

    uint d_ptrs_size;

    uint refcount;

    enum DrawOperation { StrokeDraw        = 0x1,

                         FillDraw          = 0x2,

                         StrokeAndFillDraw = 0x3

    };

    QPainterDummyState *fakeState() const {

        if (!dummyState)

            dummyState = new QPainterDummyState();

        return dummyState;

    }

    void updateEmulationSpecifier(QPainterState *s);

    void updateStateImpl(QPainterState *state);

    void updateState(QPainterState *state);

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

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

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

    void updateMatrix();

    void updateInvMatrix();

    int rectSubtraction() const {

        return state->pen.style() != Qt::NoPen && state->pen.width() == 0 ? 1 : 0;

    }

    void checkEmulation();

    QTransform viewTransform() const;

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

    void detachPainterPrivate(QPainter *q);

    QPaintDevice *device;

    QPaintDevice *original_device;

    QPaintDevice *helper_device;

    QPaintEngine *engine;

    QEmulationPaintEngine *emulationEngine;

    QPaintEngineEx *extended;

    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