/****************************************************************************+
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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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**+
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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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+
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#include "qvgimagepool_p.h"+
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#include "qpixmapdata_vg_p.h"+
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+
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QT_BEGIN_NAMESPACE+
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+
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static QVGImagePool *qt_vg_image_pool = 0;+
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+
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class QVGImagePoolPrivate+
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{+
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public:+
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    QVGImagePoolPrivate() : lruFirst(0), lruLast(0) {}+
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+
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    QVGPixmapData *lruFirst;+
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    QVGPixmapData *lruLast;+
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};+
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+
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QVGImagePool::QVGImagePool()+
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    : d_ptr(new QVGImagePoolPrivate())+
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{+
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}+
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+
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QVGImagePool::~QVGImagePool()+
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{+
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}+
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+
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QVGImagePool *QVGImagePool::instance()+
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{+
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    if (!qt_vg_image_pool)+
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        qt_vg_image_pool = new QVGImagePool();+
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    return qt_vg_image_pool;+
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}+
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+
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void QVGImagePool::setImagePool(QVGImagePool *pool)+
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{+
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    if (qt_vg_image_pool != pool)+
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        delete qt_vg_image_pool;+
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    qt_vg_image_pool = pool;+
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}+
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+
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VGImage QVGImagePool::createTemporaryImage(VGImageFormat format,+
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                                           VGint width, VGint height,+
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                                           VGbitfield allowedQuality,+
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                                           QVGPixmapData *keepData)+
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{+
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    VGImage image;+
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    do {+
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        image = vgCreateImage(format, width, height, allowedQuality);+
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        if (image != VG_INVALID_HANDLE)+
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            return image;+
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    } while (reclaimSpace(format, width, height, keepData));+
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    qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d temporary image",+
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             width, height);+
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    return VG_INVALID_HANDLE;+
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}+
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+
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VGImage QVGImagePool::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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    VGImage image;+
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    do {+
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        image = vgCreateImage(format, width, height, allowedQuality);+
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        if (image != VG_INVALID_HANDLE) {+
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            if (data)+
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                moveToHeadOfLRU(data);+
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            return image;+
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        }+
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    } while (reclaimSpace(format, width, height, data));+
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    qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d pixmap",+
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             width, height);+
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    return VG_INVALID_HANDLE;+
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}+
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+
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VGImage QVGImagePool::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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    VGImage image;+
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    do {+
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        image = vgCreateImage(format, width, height, allowedQuality);+
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        if (image != VG_INVALID_HANDLE)+
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            return image;+
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    } while (reclaimSpace(format, width, height, 0));+
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    qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d image",+
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             width, height);+
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    return VG_INVALID_HANDLE;+
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}+
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+
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void QVGImagePool::releaseImage(QVGPixmapData *data, VGImage image)+
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{+
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    // Very simple strategy at the moment: just destroy the image.+
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    if (data)+
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        removeFromLRU(data);+
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    vgDestroyImage(image);+
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}+
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+
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void QVGImagePool::useImage(QVGPixmapData *data)+
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{+
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    moveToHeadOfLRU(data);+
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}+
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+
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void QVGImagePool::detachImage(QVGPixmapData *data)+
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{+
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    removeFromLRU(data);+
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}+
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+
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bool QVGImagePool::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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    Q_UNUSED(format);   // For future use in picking the best image to eject.+
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    Q_UNUSED(width);+
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    Q_UNUSED(height);+
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+
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    if (data)+
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        moveToHeadOfLRU(data);+
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+
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    QVGPixmapData *lrudata = pixmapLRU();+
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    if (lrudata && lrudata != data) {+
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        lrudata->reclaimImages();+
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        return true;+
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    }+
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+
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    return false;+
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}+
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+
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void QVGImagePool::hibernate()+
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{+
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    // Nothing to do here at the moment since the pool does not+
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    // retain VGImage's after they have been released.+
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}+
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+
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void QVGImagePool::moveToHeadOfLRU(QVGPixmapData *data)+
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{+
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    Q_D(QVGImagePool);+
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    if (data->inLRU) {+
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        if (!data->prevLRU)+
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            return;     // Already at the head of the list.+
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        removeFromLRU(data);+
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    }+
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    data->inLRU = true;+
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    data->nextLRU = d->lruFirst;+
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    data->prevLRU = 0;+
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    if (d->lruFirst)+
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        d->lruFirst->prevLRU = data;+
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    else+
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        d->lruLast = data;+
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    d->lruFirst = data;+
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}+
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+
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void QVGImagePool::removeFromLRU(QVGPixmapData *data)+
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{+
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    Q_D(QVGImagePool);+
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    if (!data->inLRU)+
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        return;+
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    if (data->nextLRU)+
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        data->nextLRU->prevLRU = data->prevLRU;+
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    else+
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        d->lruLast = data->prevLRU;+
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    if (data->prevLRU)+
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        data->prevLRU->nextLRU = data->nextLRU;+
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    else+
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        d->lruFirst = data->nextLRU;+
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    data->inLRU = false;+
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}+
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+
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QVGPixmapData *QVGImagePool::pixmapLRU()+
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{+
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    Q_D(QVGImagePool);+
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    return d->lruLast;+
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}+
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+
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QT_END_NAMESPACE+
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