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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 157 insertions, 0 deletions

diff --git a/src/openvg/qvgimagepool_p.h b/src/openvg/qvgimagepool_p.h
new file mode 100644
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+++ b/src/openvg/qvgimagepool_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 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