/****************************************************************************+ −
**+ −
** Copyright (C) 2010 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.+ −
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** $QT_END_LICENSE$+ −
**+ −
****************************************************************************/+ −
+ − #include "qvgimagepool_p.h"+ −
#include "qpixmapdata_vg_p.h"+ −
+ − QT_BEGIN_NAMESPACE+ −
+ − static QVGImagePool *qt_vg_image_pool = 0;+ −
+ − class QVGImagePoolPrivate+ −
{+ −
public:+ −
QVGImagePoolPrivate() : lruFirst(0), lruLast(0) {}+ −
+ − QVGPixmapData *lruFirst;+ −
QVGPixmapData *lruLast;+ −
};+ −
+ − QVGImagePool::QVGImagePool()+ −
: d_ptr(new QVGImagePoolPrivate())+ −
{+ −
}+ −
+ − QVGImagePool::~QVGImagePool()+ −
{+ −
}+ −
+ − QVGImagePool *QVGImagePool::instance()+ −
{+ −
if (!qt_vg_image_pool)+ −
qt_vg_image_pool = new QVGImagePool();+ −
return qt_vg_image_pool;+ −
}+ −
+ − void QVGImagePool::setImagePool(QVGImagePool *pool)+ −
{+ −
if (qt_vg_image_pool != pool)+ −
delete qt_vg_image_pool;+ −
qt_vg_image_pool = pool;+ −
}+ −
+ − VGImage QVGImagePool::createTemporaryImage(VGImageFormat format,+ −
VGint width, VGint height,+ −
VGbitfield allowedQuality,+ −
QVGPixmapData *keepData)+ −
{+ −
VGImage image;+ −
do {+ −
image = vgCreateImage(format, width, height, allowedQuality);+ −
if (image != VG_INVALID_HANDLE)+ −
return image;+ −
} while (reclaimSpace(format, width, height, keepData));+ −
qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d temporary image",+ −
width, height);+ −
return VG_INVALID_HANDLE;+ −
}+ −
+ − VGImage QVGImagePool::createImageForPixmap(VGImageFormat format,+ −
VGint width, VGint height,+ −
VGbitfield allowedQuality,+ −
QVGPixmapData *data)+ −
{+ −
VGImage image;+ −
do {+ −
image = vgCreateImage(format, width, height, allowedQuality);+ −
if (image != VG_INVALID_HANDLE) {+ −
if (data)+ −
moveToHeadOfLRU(data);+ −
return image;+ −
}+ −
} while (reclaimSpace(format, width, height, data));+ −
qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d pixmap",+ −
width, height);+ −
return VG_INVALID_HANDLE;+ −
}+ −
+ − VGImage QVGImagePool::createPermanentImage(VGImageFormat format,+ −
VGint width, VGint height,+ −
VGbitfield allowedQuality)+ −
{+ −
VGImage image;+ −
do {+ −
image = vgCreateImage(format, width, height, allowedQuality);+ −
if (image != VG_INVALID_HANDLE)+ −
return image;+ −
} while (reclaimSpace(format, width, height, 0));+ −
qWarning("QVGImagePool: cannot reclaim sufficient space for a %dx%d image",+ −
width, height);+ −
return VG_INVALID_HANDLE;+ −
}+ −
+ − void QVGImagePool::releaseImage(QVGPixmapData *data, VGImage image)+ −
{+ −
// Very simple strategy at the moment: just destroy the image.+ −
if (data)+ −
removeFromLRU(data);+ −
vgDestroyImage(image);+ −
}+ −
+ − void QVGImagePool::useImage(QVGPixmapData *data)+ −
{+ −
moveToHeadOfLRU(data);+ −
}+ −
+ − void QVGImagePool::detachImage(QVGPixmapData *data)+ −
{+ −
removeFromLRU(data);+ −
}+ −
+ − bool QVGImagePool::reclaimSpace(VGImageFormat format,+ −
VGint width, VGint height,+ −
QVGPixmapData *data)+ −
{+ −
Q_UNUSED(format); // For future use in picking the best image to eject.+ −
Q_UNUSED(width);+ −
Q_UNUSED(height);+ −
+ − if (data)+ −
moveToHeadOfLRU(data);+ −
+ − QVGPixmapData *lrudata = pixmapLRU();+ −
if (lrudata && lrudata != data) {+ −
lrudata->reclaimImages();+ −
return true;+ −
}+ −
+ − return false;+ −
}+ −
+ − void QVGImagePool::hibernate()+ −
{+ −
// Nothing to do here at the moment since the pool does not+ −
// retain VGImage's after they have been released.+ −
}+ −
+ − void QVGImagePool::moveToHeadOfLRU(QVGPixmapData *data)+ −
{+ −
Q_D(QVGImagePool);+ −
if (data->inLRU) {+ −
if (!data->prevLRU)+ −
return; // Already at the head of the list.+ −
removeFromLRU(data);+ −
}+ −
data->inLRU = true;+ −
data->nextLRU = d->lruFirst;+ −
data->prevLRU = 0;+ −
if (d->lruFirst)+ −
d->lruFirst->prevLRU = data;+ −
else+ −
d->lruLast = data;+ −
d->lruFirst = data;+ −
}+ −
+ − void QVGImagePool::removeFromLRU(QVGPixmapData *data)+ −
{+ −
Q_D(QVGImagePool);+ −
if (!data->inLRU)+ −
return;+ −
if (data->nextLRU)+ −
data->nextLRU->prevLRU = data->prevLRU;+ −
else+ −
d->lruLast = data->prevLRU;+ −
if (data->prevLRU)+ −
data->prevLRU->nextLRU = data->nextLRU;+ −
else+ −
d->lruFirst = data->nextLRU;+ −
data->inLRU = false;+ −
}+ −
+ − QVGPixmapData *QVGImagePool::pixmapLRU()+ −
{+ −
Q_D(QVGImagePool);+ −
return d->lruLast;+ −
}+ −
+ − QT_END_NAMESPACE+ −