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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSGSHAREDDISTANCEFIELDGLYPHCACHE_H
#define QSGSHAREDDISTANCEFIELDGLYPHCACHE_H
#include <QtCore/qwaitcondition.h>
#include <private/qsgadaptationlayer_p.h>
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 QList<QDistanceField> &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 QVector<quint32> &itemIds,
const QVector<QPoint> &positions);
void reportItemsUpdated(const QByteArray &cacheId,
void *bufferId,
const QVector<quint32> &itemIds,
const QVector<QPoint> &positions);
void reportItemsInvalidated(const QByteArray &cacheId, const QVector<quint32> &itemIds);
void sceneGraphUpdateStarted();
void sceneGraphUpdateDone();
private:
void waitForGlyphs();
void saveTexture(GLuint textureId, int width, int height);
QSet<quint32> m_requestedGlyphsThatHaveNotBeenReturned;
QSet<quint32> m_requestedGlyphs;
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;
};
struct Owner
{
Owner() : ref(0) {}
Owner(const Owner &o) : item(o.item), ref(o.ref) {}
Owner &operator =(const Owner &o) { item = o.item; ref = o.ref; return *this; }
QPointer<QQuickItem> item;
int ref;
};
QHash<quint32, PendingGlyph> m_pendingReadyGlyphs;
QHash<glyph_t, void *> m_bufferForGlyph;
QHash<QQuickItem *, Owner> m_registeredOwners;
bool m_isInSceneGraphUpdate;
bool m_hasPostedEvents;
};
QT_END_NAMESPACE
#endif // QSGSHAREDDISTANCEFIELDGLYPHCACHE_H
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