src/apps/mediaplayer/media_node_framework/video/VideoTarget.h

   1 /*
   2  * Copyright 2000-2008 Ingo Weinhold <ingo_weinhold@gmx.de> All rights reserved.
   3  * Distributed under the terms of the MIT license.
   4  */
   5
   6 /*!     Derived classes are video consumer targets. Each time the consumer
   7         has received a frame (that is not late and thus dropped) it calls
   8         SetBitmap(). This method should immediately do whatever has to be done.
   9         Until the next call to SetBitmap() the bitmap can be used -- thereafter
  10         it is not allowed to use it any longer. Therefore the bitmap variable
  11         is protected by a lock. Anytime it is going to be accessed, the object
  12         must be locked.
  13 */
  14 #ifndef VIDEO_TARGET_H
  15 #define VIDEO_TARGET_H
  16
  17
  18 #include <Locker.h>
  19
  20
  21 class BBitmap;
  22
  23
  24 class VideoTarget {
  25  public:
  26                                                                 VideoTarget();
  27         virtual                                         ~VideoTarget();
  28
  29                         bool                            LockBitmap();
  30                         void                            UnlockBitmap();
  31
  32         virtual void                            SetBitmap(const BBitmap* bitmap);
  33                         const BBitmap*          GetBitmap() const;
  34
  35  protected:
  36                         BLocker                         fBitmapLock;
  37                         const BBitmap* volatile fBitmap;
  38 };
  39
  40 #endif  // VIDEO_TARGET_H