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/****************************************************************************
**
** 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 QtOpenVG 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 QVGIMAGEPOOL_P_H
#define QVGIMAGEPOOL_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qvg.h"
#include <QtCore/qscopedpointer.h>
QT_BEGIN_NAMESPACE
class QVGPixmapData;
class QVGImagePoolPrivate;
class Q_OPENVG_EXPORT QVGImagePool
{
public:
QVGImagePool();
virtual ~QVGImagePool();
static QVGImagePool *instance();
// This function can be used from system-specific graphics system
// plugins to alter the image allocation strategy.
static void setImagePool(QVGImagePool *pool);
// Create a new VGImage from the pool with the specified parameters
// that is not associated with a pixmap. The VGImage is returned to
// the pool when releaseImage() is called.
//
// This function will call reclaimSpace() when vgCreateImage() fails.
//
// This function is typically called when allocating temporary
// VGImage's for pixmap filters. The "keepData" object will not
// be reclaimed if reclaimSpace() needs to be called.
virtual VGImage createTemporaryImage(VGImageFormat format,
VGint width, VGint height,
VGbitfield allowedQuality,
QVGPixmapData *keepData = 0);
// Create a new VGImage with the specified parameters and associate
// it with "data". The QVGPixmapData will be notified when the
// VGImage needs to be reclaimed by the pool.
//
// This function will call reclaimSpace() when vgCreateImage() fails.
virtual VGImage createImageForPixmap(VGImageFormat format,
VGint width, VGint height,
VGbitfield allowedQuality,
QVGPixmapData *data);
// Create a permanent VGImage with the specified parameters.
// If there is insufficient space for the vgCreateImage call,
// then this function will call reclaimSpace() and try again.
//
// The caller is responsible for calling vgDestroyImage()
// when it no longer needs the VGImage, as the image is not
// recorded in the image pool.
//
// This function is typically used for pattern brushes where
// the OpenVG engine is responsible for managing the lifetime
// of the VGImage, destroying it automatically when the brush
// is no longer in use.
virtual VGImage createPermanentImage(VGImageFormat format,
VGint width, VGint height,
VGbitfield allowedQuality);
// Release a VGImage that is no longer required.
virtual void releaseImage(QVGPixmapData *data, VGImage image);
// Notify the pool that a QVGPixmapData object is using
// an image again. This allows the pool to move the image
// within a least-recently-used list of QVGPixmapData objects.
virtual void useImage(QVGPixmapData *data);
// Notify the pool that the VGImage's associated with a
// QVGPixmapData are being detached from the pool. The caller
// will become responsible for calling vgDestroyImage().
virtual void detachImage(QVGPixmapData *data);
// Reclaim space for an image allocation with the specified parameters.
// Returns true if space was reclaimed, or false if there is no
// further space that can be reclaimed. The "data" parameter
// indicates the pixmap that is trying to obtain space which should
// not itself be reclaimed.
virtual bool reclaimSpace(VGImageFormat format,
VGint width, VGint height,
QVGPixmapData *data);
// Hibernate the image pool because the context is about to be
// destroyed. All VGImage's left in the pool should be released.
virtual void hibernate();
protected:
// Helper functions for managing the LRU list of QVGPixmapData objects.
void moveToHeadOfLRU(QVGPixmapData *data);
void removeFromLRU(QVGPixmapData *data);
QVGPixmapData *pixmapLRU();
private:
QScopedPointer<QVGImagePoolPrivate> d_ptr;
Q_DECLARE_PRIVATE(QVGImagePool)
Q_DISABLE_COPY(QVGImagePool)
};
QT_END_NAMESPACE
#endif
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