DummyConsumer.h revision f71c4ae136f7749b9dfdaa2dd64d771868eeeb2d 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_GUI_DUMMYCONSUMER_H
18#define ANDROID_GUI_DUMMYCONSUMER_H
19
20#include <gui/BufferQueue.h>
21
22namespace android {
23// ----------------------------------------------------------------------------
24
25
26// The DummyConsumer does not keep a reference to BufferQueue
27// unlike SurfaceTexture.  This prevents a circular reference from
28// forming.  The BufferQueue indirectly keeps a DummyConsumer alive
29// through the proxy ConsumerListener.
30class DummyConsumer : public virtual RefBase,
31        protected BufferQueue::ConsumerListener {
32public:
33    DummyConsumer(sp<BufferQueue> bufferQueue);
34    virtual ~DummyConsumer();
35
36protected:
37
38    // Implementation of the BufferQueue::ConsumerListener interface.  These
39    // calls are used to notify the SurfaceTexture of asynchronous events in the
40    // BufferQueue.
41    virtual void onFrameAvailable();
42    virtual void onBuffersReleased();
43
44};
45
46// ----------------------------------------------------------------------------
47}; // namespace android
48
49#endif // ANDROID_GUI_DUMMYCONSUMER_H
50