examples/example7/OverlayWidget.h

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#ifndef OVERLAY_WIDGET_H
#define OVERLAY_WIDGET_H

#include <QWidget>
#include <QX11Info>

#include <sys/ipc.h>
#include <sys/shm.h>

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/Xv.h>
#include <X11/extensions/Xvlib.h>

#include <FCam/Image.h>

class OverlayWidget : public QWidget {
  public:
    OverlayWidget(QWidget *parent = NULL);

    // If you draw on a widget at the same place as this one, using
    // any color but the one below, it will show through the overlay.
    static QColor colorKey() {return QColor(0, 0, 0);}

    // A reference to the frame buffer
    FCam::Image framebuffer();


 protected:

    void paintEvent(QPaintEvent *e);

    void initXv();

    void checkImageSize();

    Display *dpy;

    // two different ways to refer to the same data
    XvImage *yuv_image;
    FCam::Image framebuffer_;

    XShmSegmentInfo yuv_shminfo;
    GC gc;
    int xv_port;    
};

#endif

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