--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/openvg/qvgimagepool.cpp	Tue Feb 02 00:43:10 2010 +0200
@@ -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