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2 | ** |
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40 | ****************************************************************************/ |
41 | |
42 | #ifndef QMEEGOFENCESYNC_H |
43 | #define QMEEGOFENCESYNC_H |
44 | |
45 | #include <QtGui/QWidget> |
46 | |
47 | class 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 | |
72 | class Q_DECL_EXPORT QMeeGoFenceSync : public QObject |
73 | { |
74 | public: |
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 | |
92 | private: |
93 | Q_DISABLE_COPY(QMeeGoFenceSync) |
94 | Q_DECLARE_PRIVATE(QMeeGoFenceSync) |
95 | |
96 | protected: |
97 | QScopedPointer<QMeeGoFenceSyncPrivate> d_ptr; //! Private bits. |
98 | friend class QMeeGoLivePixmap; |
99 | }; |
100 | |
101 | #endif |
102 |
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