| /**************************************************************************** |
| ** |
| ** 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. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** GNU Lesser General Public License Usage |
| ** 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. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU General |
| ** Public License version 3.0 as published by the Free Software Foundation |
| ** and appearing in the file LICENSE.GPL included in the packaging of this |
| ** file. Please review the following information to ensure the GNU General |
| ** Public License version 3.0 requirements will be met: |
| ** http://www.gnu.org/copyleft/gpl.html. |
| ** |
| ** Other Usage |
| ** Alternatively, this file may be used in accordance with the terms and |
| ** conditions contained in a signed written agreement between you and Nokia. |
| ** |
| ** |
| ** |
| ** |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #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); |
| |
| bool succeeded = false; |
| bool wasInLRU = false; |
| if (data) { |
| wasInLRU = data->inLRU; |
| moveToHeadOfLRU(data); |
| } |
| |
| QVGPixmapData *lrudata = pixmapLRU(); |
| if (lrudata && lrudata != data) { |
| lrudata->reclaimImages(); |
| succeeded = true; |
| } |
| |
| if (data && !wasInLRU) |
| removeFromLRU(data); |
| |
| return succeeded; |
| } |
| |
| void QVGImagePool::hibernate() |
| { |
| Q_D(QVGImagePool); |
| QVGPixmapData *pd = d->lruLast; |
| while (pd) { |
| QVGPixmapData *prevLRU = pd->prevLRU; |
| pd->inImagePool = false; |
| pd->inLRU = false; |
| pd->nextLRU = 0; |
| pd->prevLRU = 0; |
| pd->hibernate(); |
| pd = prevLRU; |
| } |
| d->lruFirst = 0; |
| d->lruLast = 0; |
| } |
| |
| 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 |