qt-everywhere-src-5.14.1/qtmultimedia/src/qtmultimediaquicktools/qdeclarativevideooutput_backend_p.h

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#ifndef QDECLARATIVEVIDEOOUTPUT_BACKEND_P_H
#define QDECLARATIVEVIDEOOUTPUT_BACKEND_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/qpointer.h>
#include <QtCore/qsize.h>
#include <QtQuick/qquickitem.h>
#include <QtQuick/qsgnode.h>
#include <private/qtmultimediaquickdefs_p.h>

QT_BEGIN_NAMESPACE

class QAbstractVideoSurface;
class QDeclarativeVideoOutput;
class QMediaService;
class QAbstractVideoFilter;

class Q_MULTIMEDIAQUICK_EXPORT QDeclarativeVideoBackend
{
public:
    explicit QDeclarativeVideoBackend(QDeclarativeVideoOutput *parent)
        : q(parent)
    {}

    virtual ~QDeclarativeVideoBackend()
    {}

    virtual bool init(QMediaService *service) = 0;
    virtual void releaseSource() = 0;
    virtual void releaseControl() = 0;
    virtual void itemChange(QQuickItem::ItemChange change,
                            const QQuickItem::ItemChangeData &changeData) = 0;
    virtual QSize nativeSize() const = 0;
    virtual void updateGeometry() = 0;
    virtual QSGNode *updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *data) = 0;
    virtual QAbstractVideoSurface *videoSurface() const = 0;

    // The viewport, adjusted for the pixel aspect ratio
    virtual QRectF adjustedViewport() const = 0;

    virtual void appendFilter(QAbstractVideoFilter *filter) { Q_UNUSED(filter); }
    virtual void clearFilters() { }

    virtual void releaseResources() { }
    virtual void invalidateSceneGraph() { }

protected:
    QDeclarativeVideoOutput *q;
    QPointer<QMediaService> m_service;
};

class QDeclarativeVideoBackendFactoryInterface
{
public:
    virtual QDeclarativeVideoBackend *create(QDeclarativeVideoOutput *parent) = 0;
};

#define QDeclarativeVideoBackendFactoryInterface_iid "org.qt-project.qt.declarativevideobackendfactory/5.2"
Q_DECLARE_INTERFACE(QDeclarativeVideoBackendFactoryInterface, QDeclarativeVideoBackendFactoryInterface_iid)

/*
 * Helper - returns true if the given orientation has the same aspect as the default (e.g. 180*n)
 */
namespace {

inline bool qIsDefaultAspect(int o)
{
    return (o % 180) == 0;
}

/*
 * Return the orientation normalized to 0-359
 */
inline int qNormalizedOrientation(int o)
{
    // Negative orientations give negative results
    int o2 = o % 360;
    if (o2 < 0)
        o2 += 360;
    return o2;
}

}

QT_END_NAMESPACE

#endif