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41
42#ifndef QMEEGOFENCESYNC_H
43#define QMEEGOFENCESYNC_H
44
45#include <QtGui/QWidget>
46
47class QMeeGoFenceSyncPrivate;
48
49//! A synchronization helper for GL pipeline.
50/*!
51 Fence syncs provide a mechanism for synchronizing access to certain GL primitives
52 and make it possible for the application developer to be sure that a certain point
53 in the GL processing pipeline has been already executed before continuing operation.
54
55 Currently fence syncs are only useful in conjunction with QMeeGoLivePixmaps.
56 \code
57 ...
58 // In your paint/expose event:
59 QImage *image = livePixmap->lock(&someGlobalFenceSync);
60 // Modify the image...
61 livePixmap->release(image);
62
63 painter->drawPixmap(0, 0, *livePixmap);
64 someGlobalFenceSync.setSyncPoint();
65 ...
66 \endcode
67
68 Assuming the paint/expose events come repeatedly, the lock operation
69 will block till the previous event completed painting the livePixmap.
70*/
71
72class Q_DECL_EXPORT QMeeGoFenceSync : public QObject
73{
74public:
75 //! Constructs a new fence sync.
76 /*!
77 The fence sync is created without a sync point. You need to set the sync point manually.
78 */
79 QMeeGoFenceSync(QWidget *parent = 0);
80
81 //! Destructor for the fence sync.
82 virtual ~QMeeGoFenceSync();
83
84 //! Sets the fence sync.
85 /*!
86 The fence sync synchronization point should be set after all drawing has been scheduled.
87 Setting a synchronization point always overrides the previous point -- whetver is was
88 used (waited upon) or not.
89 */
90 void setSyncPoint();
91
92private:
93 Q_DISABLE_COPY(QMeeGoFenceSync)
94 Q_DECLARE_PRIVATE(QMeeGoFenceSync)
95
96protected:
97 QScopedPointer<QMeeGoFenceSyncPrivate> d_ptr; //! Private bits.
98 friend class QMeeGoLivePixmap;
99};
100
101#endif
102

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