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/****************************************************************************
**
** 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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
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