1/*
2 * Copyright 2014 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_IPRODUCERLISTENER_H
18#define ANDROID_GUI_IPRODUCERLISTENER_H
19
20#include <binder/IInterface.h>
21
22#include <utils/RefBase.h>
23
24namespace android {
25
26// ProducerListener is the interface through which the BufferQueue notifies the
27// producer of events that the producer may wish to react to. Because the
28// producer will generally have a mutex that is locked during calls from the
29// producer to the BufferQueue, these calls from the BufferQueue to the
30// producer *MUST* be called only when the BufferQueue mutex is NOT locked.
31
32class ProducerListener : public virtual RefBase
33{
34public:
35    ProducerListener() {}
36    virtual ~ProducerListener() {}
37
38    // onBufferReleased is called from IGraphicBufferConsumer::releaseBuffer to
39    // notify the producer that a new buffer is free and ready to be dequeued.
40    //
41    // This is called without any lock held and can be called concurrently by
42    // multiple threads.
43    virtual void onBufferReleased() = 0; // Asynchronous
44};
45
46class IProducerListener : public ProducerListener, public IInterface
47{
48public:
49    DECLARE_META_INTERFACE(ProducerListener)
50};
51
52class BnProducerListener : public BnInterface<IProducerListener>
53{
54public:
55    virtual status_t onTransact(uint32_t code, const Parcel& data,
56            Parcel* reply, uint32_t flags = 0);
57};
58
59class DummyProducerListener : public BnProducerListener
60{
61public:
62    virtual void onBufferReleased() {}
63};
64
65} // namespace android
66
67#endif
68