/****************************************************************************+
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**+
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** Copyright (C) 2010 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 QtOpenVG 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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** 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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** 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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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef QVGIMAGEPOOL_P_H+
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#define QVGIMAGEPOOL_P_H+
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+
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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 for the convenience+
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// of other Qt classes.  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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+
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#include "qvg.h"+
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#include <QtCore/qscopedpointer.h>+
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+
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QT_BEGIN_NAMESPACE+
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+
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class QVGPixmapData;+
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class QVGImagePoolPrivate;+
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+
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class Q_OPENVG_EXPORT QVGImagePool+
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{+
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public:+
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    QVGImagePool();+
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    virtual ~QVGImagePool();+
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+
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    static QVGImagePool *instance();+
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+
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    // This function can be used from system-specific graphics system+
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    // plugins to alter the image allocation strategy.+
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    static void setImagePool(QVGImagePool *pool);+
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+
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    // Create a new VGImage from the pool with the specified parameters+
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    // that is not associated with a pixmap.  The VGImage is returned to+
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    // the pool when releaseImage() is called.+
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    //+
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    // This function will call reclaimSpace() when vgCreateImage() fails.+
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    //+
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    // This function is typically called when allocating temporary+
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    // VGImage's for pixmap filters.  The "keepData" object will not+
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    // be reclaimed if reclaimSpace() needs to be called.+
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    virtual VGImage createTemporaryImage(VGImageFormat format,+
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                                         VGint width, VGint height,+
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                                         VGbitfield allowedQuality,+
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                                         QVGPixmapData *keepData = 0);+
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+
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    // Create a new VGImage with the specified parameters and associate+
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    // it with "data".  The QVGPixmapData will be notified when the+
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    // VGImage needs to be reclaimed by the pool.+
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    //+
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    // This function will call reclaimSpace() when vgCreateImage() fails.+
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    virtual VGImage createImageForPixmap(VGImageFormat format,+
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                                         VGint width, VGint height,+
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                                         VGbitfield allowedQuality,+
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                                         QVGPixmapData *data);+
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+
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    // Create a permanent VGImage with the specified parameters.+
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    // If there is insufficient space for the vgCreateImage call,+
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    // then this function will call reclaimSpace() and try again.+
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    //+
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    // The caller is responsible for calling vgDestroyImage()+
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    // when it no longer needs the VGImage, as the image is not+
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    // recorded in the image pool.+
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    //+
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    // This function is typically used for pattern brushes where+
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    // the OpenVG engine is responsible for managing the lifetime+
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    // of the VGImage, destroying it automatically when the brush+
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    // is no longer in use.+
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    virtual VGImage createPermanentImage(VGImageFormat format,+
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                                         VGint width, VGint height,+
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                                         VGbitfield allowedQuality);+
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+
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    // Release a VGImage that is no longer required.+
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    virtual void releaseImage(QVGPixmapData *data, VGImage image);+
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+
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    // Notify the pool that a QVGPixmapData object is using+
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    // an image again.  This allows the pool to move the image+
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    // within a least-recently-used list of QVGPixmapData objects.+
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    virtual void useImage(QVGPixmapData *data);+
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+
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    // Notify the pool that the VGImage's associated with a+
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    // QVGPixmapData are being detached from the pool.  The caller+
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    // will become responsible for calling vgDestroyImage().+
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    virtual void detachImage(QVGPixmapData *data);+
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+
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    // Reclaim space for an image allocation with the specified parameters.+
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    // Returns true if space was reclaimed, or false if there is no+
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    // further space that can be reclaimed.  The "data" parameter+
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    // indicates the pixmap that is trying to obtain space which should+
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    // not itself be reclaimed.+
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    virtual bool reclaimSpace(VGImageFormat format,+
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                              VGint width, VGint height,+
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                              QVGPixmapData *data);+
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+
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    // Hibernate the image pool because the context is about to be+
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    // destroyed.  All VGImage's left in the pool should be released.+
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    virtual void hibernate();+
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+
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protected:+
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    // Helper functions for managing the LRU list of QVGPixmapData objects.+
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    void moveToHeadOfLRU(QVGPixmapData *data);+
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    void removeFromLRU(QVGPixmapData *data);+
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    QVGPixmapData *pixmapLRU();+
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+
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private:+
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    QScopedPointer<QVGImagePoolPrivate> d_ptr;+
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+
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    Q_DECLARE_PRIVATE(QVGImagePool)+
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    Q_DISABLE_COPY(QVGImagePool)+
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};+
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+
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QT_END_NAMESPACE+
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+
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#endif+
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