src/gui/painting/qvectorpath_p.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 00:43:10 +0200
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Revision: 201003 Kit: 201005
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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QVECTORPATH_P_H
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#define QVECTORPATH_P_H
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//
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//  W A R N I N G
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//  -------------
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//
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// This file is not part of the Qt API.  It exists purely as an
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// implementation detail.  This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include <QtGui/qpaintengine.h>
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#include <private/qpaintengine_p.h>
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#include <private/qstroker_p.h>
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#include <private/qpainter_p.h>
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QT_BEGIN_HEADER
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QT_BEGIN_NAMESPACE
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QT_MODULE(Gui)
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class QPaintEngineEx;
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typedef void (*qvectorpath_cache_cleanup)(QPaintEngineEx *engine, void *data);
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struct QRealRect {
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    qreal x1, y1, x2, y2;
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};
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class Q_GUI_EXPORT QVectorPath
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{
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public:
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    enum Hint {
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        // Shape hints, in 0x000000ff, access using shape()
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        AreaShapeMask           = 0x0001,       // shape covers an area
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        NonConvexShapeMask      = 0x0002,       // shape is not convex
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        CurvedShapeMask         = 0x0004,       // shape contains curves...
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        LinesShapeMask          = 0x0008,
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        RectangleShapeMask      = 0x0010,
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        ShapeMask               = 0x001f,
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        // Shape hints merged into basic shapes..
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        LinesHint               = LinesShapeMask,
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        RectangleHint           = AreaShapeMask | RectangleShapeMask,
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        EllipseHint             = AreaShapeMask | CurvedShapeMask,
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        ConvexPolygonHint       = AreaShapeMask,
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        PolygonHint             = AreaShapeMask | NonConvexShapeMask,
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        RoundedRectHint         = AreaShapeMask | CurvedShapeMask,
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        ArbitraryShapeHint      = AreaShapeMask | NonConvexShapeMask | CurvedShapeMask,
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        // Other hints
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        IsCachedHint            = 0x0100, // Set if the cache hint is set
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        ShouldUseCacheHint      = 0x0200, // Set if the path should be cached when possible..
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        ControlPointRect        = 0x0400, // Set if the control point rect has been calculated...
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        // Shape rendering specifiers...
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        OddEvenFill             = 0x1000,
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        WindingFill             = 0x2000,
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        ImplicitClose           = 0x4000
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    };
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    // ### Falcon: introduca a struct XY for points so lars is not so confused...
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    QVectorPath(const qreal *points,
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                int count,
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                const QPainterPath::ElementType *elements = 0,
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                uint hints = ArbitraryShapeHint)
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        : m_elements(elements),
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          m_points(points),
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          m_count(count),
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          m_hints(hints)
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    {
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    }
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    ~QVectorPath();
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    QRectF controlPointRect() const;
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    inline Hint shape() const { return (Hint) (m_hints & ShapeMask); }
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    inline bool isConvex() const { return (m_hints & NonConvexShapeMask) == 0; }
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    inline bool isCurved() const { return m_hints & CurvedShapeMask; }
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    inline bool isCacheable() const { return m_hints & ShouldUseCacheHint; }
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    inline bool hasImplicitClose() const { return m_hints & ImplicitClose; }
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    inline bool hasWindingFill() const { return m_hints & WindingFill; }
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    inline void makeCacheable() const { m_hints |= ShouldUseCacheHint; m_cache = 0; }
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    inline uint hints() const { return m_hints; }
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    inline const QPainterPath::ElementType *elements() const { return m_elements; }
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    inline const qreal *points() const { return m_points; }
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    inline bool isEmpty() const { return m_points == 0; }
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    inline int elementCount() const { return m_count; }
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    inline const QPainterPath convertToPainterPath() const;
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    static inline uint polygonFlags(QPaintEngine::PolygonDrawMode mode);
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    struct CacheEntry {
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        QPaintEngineEx *engine;
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        void *data;
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        qvectorpath_cache_cleanup cleanup;
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        CacheEntry *next;
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    };
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    CacheEntry *addCacheData(QPaintEngineEx *engine, void *data, qvectorpath_cache_cleanup cleanup) const;
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    inline CacheEntry *lookupCacheData(QPaintEngineEx *engine) const {
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        Q_ASSERT(m_hints & ShouldUseCacheHint);
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        CacheEntry *e = m_cache;
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        while (e) {
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            if (e->engine == engine)
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                return e;
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            e = e->next;
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        }
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        return 0;
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    }
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private:
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    Q_DISABLE_COPY(QVectorPath)
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    const QPainterPath::ElementType *m_elements;
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    const qreal *m_points;
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    const int m_count;
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    mutable uint m_hints;
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    mutable QRealRect m_cp_rect;
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    mutable CacheEntry *m_cache;
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};
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Q_GUI_EXPORT const QVectorPath &qtVectorPathForPath(const QPainterPath &path);
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QT_END_NAMESPACE
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QT_END_HEADER
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#endif