/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtDeclarative 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.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QSGSHAREDDISTANCEFIELDGLYPHCACHE_H
#define QSGSHAREDDISTANCEFIELDGLYPHCACHE_H

#include <QtCore/qwaitcondition.h>
#include <private/qsgadaptationlayer_p.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QPlatformSharedGraphicsCache;
class QSGSharedDistanceFieldGlyphCache : public QObject, public QSGDistanceFieldGlyphCache
{
    Q_OBJECT
public:
    explicit QSGSharedDistanceFieldGlyphCache(const QByteArray &cacheId,
                                              QPlatformSharedGraphicsCache *sharedGraphicsCache,
                                              QSGDistanceFieldGlyphCacheManager *man,
                                              QOpenGLContext *c,
                                              const QRawFont &font);
    ~QSGSharedDistanceFieldGlyphCache();

    void registerOwnerElement(QQuickItem *ownerElement);
    void unregisterOwnerElement(QQuickItem *ownerElement);
    void processPendingGlyphs();

    void requestGlyphs(const QSet<glyph_t> &glyphs);
    void referenceGlyphs(const QSet<glyph_t> &glyphs);
    void storeGlyphs(const QHash<glyph_t, QImage> &glyphs);
    void releaseGlyphs(const QSet<glyph_t> &glyphs);

Q_SIGNALS:
    void glyphsPending();

private Q_SLOTS:
    void reportItemsMissing(const QByteArray &cacheId, const QVector<quint32> &itemIds);
    void reportItemsAvailable(const QByteArray &cacheId,
                          void *bufferId, const QSize &bufferSize,
                          const QVector<quint32> &itemIds, const QVector<QPoint> &positions);
    void reportItemsInvalidated(const QByteArray &cacheId, const QVector<quint32> &itemIds);

private:
    void waitForGlyphs();
    void saveTexture(GLuint textureId, int width, int height);

    QSet<quint32> m_requestedGlyphsThatHaveNotBeenReturned;
    QWaitCondition m_pendingGlyphsCondition;
    QByteArray m_cacheId;
    QPlatformSharedGraphicsCache *m_sharedGraphicsCache;
    QMutex m_pendingGlyphsMutex;

    QSet<glyph_t> m_pendingInvalidatedGlyphs;
    QSet<glyph_t> m_pendingMissingGlyphs;

    struct PendingGlyph
    {
        PendingGlyph() : buffer(0) {}

        void *buffer;
        QSize bufferSize;
        QPoint position;
    };

    QHash<quint32, PendingGlyph> m_pendingReadyGlyphs;
    QHash<glyph_t, void *> m_bufferForGlyph;
};

QT_END_NAMESPACE

QT_END_HEADER

#endif // QSGSHAREDDISTANCEFIELDGLYPHCACHE_H