qt-everywhere-src-5.15.1/qtmultimedia/src/plugins/avfoundation/camera/avfcamerawindowcontrol.h

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#ifndef AVFCAMERAWINDOWCONTROL_H
#define AVFCAMERAWINDOWCONTROL_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 <QVideoWindowControl>

@class AVCaptureVideoPreviewLayer;
#if defined(Q_OS_MACOS)
@class NSView;
typedef NSView NativeView;
#else
@class UIView;
typedef UIView NativeView;
#endif

QT_BEGIN_NAMESPACE

class AVFCameraWindowControl : public QVideoWindowControl
{
    Q_OBJECT
public:
    AVFCameraWindowControl(QObject *parent = nullptr);
    virtual ~AVFCameraWindowControl() override;

    // QVideoWindowControl interface
public:
    WId winId() const override;
    void setWinId(WId id) override;

    QRect displayRect() const override;
    void setDisplayRect(const QRect &rect) override;

    bool isFullScreen() const override;
    void setFullScreen(bool fullScreen) override;

    void repaint() override;

    QSize nativeSize() const override;

    Qt::AspectRatioMode aspectRatioMode() const override;
    void setAspectRatioMode(Qt::AspectRatioMode mode) override;

    int brightness() const override;
    void setBrightness(int brightness) override;

    int contrast() const override;
    void setContrast(int contrast) override;

    int hue() const override;
    void setHue(int hue) override;

    int saturation() const override;
    void setSaturation(int saturation) override;

    // AVF Camera implementation details
    void setNativeSize(QSize size);
    void setLayer(AVCaptureVideoPreviewLayer *capturePreviewLayer);

private:
    void updateAspectRatio();
    void updateCaptureLayerBounds();

    void retainNativeLayer();
    void releaseNativeLayer();

    void attachNativeLayer();
    void detachNativeLayer();

    WId m_winId{0};
    QRect m_displayRect;
    bool m_fullscreen{false};
    Qt::AspectRatioMode m_aspectRatioMode{Qt::IgnoreAspectRatio};
    QSize m_nativeSize;
    AVCaptureVideoPreviewLayer *m_captureLayer{nullptr};
    NativeView *m_nativeView{nullptr};
};

QT_END_NAMESPACE

#endif // AVFCAMERAWINDOWCONTROL_H