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Diffstat (limited to 'src/openvg/qvgimagepool.cpp')
| -rw-r--r-- | src/openvg/qvgimagepool.cpp | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/src/openvg/qvgimagepool.cpp b/src/openvg/qvgimagepool.cpp new file mode 100644 index 0000000..93e6e03 --- /dev/null +++ b/src/openvg/qvgimagepool.cpp @@ -0,0 +1,215 @@ +/**************************************************************************** +** +** Copyright (C) 2009 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 |