1 /*
2  * Copyright (C) 2011 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_IDISPLAY_EVENT_CONNECTION_H
18 #define ANDROID_GUI_IDISPLAY_EVENT_CONNECTION_H
19 
20 #include <stdint.h>
21 #include <sys/types.h>
22 
23 #include <utils/Errors.h>
24 #include <utils/RefBase.h>
25 
26 #include <binder/IInterface.h>
27 
28 namespace android {
29 // ----------------------------------------------------------------------------
30 
31 class BitTube;
32 
33 class IDisplayEventConnection : public IInterface
34 {
35 public:
36 
37     DECLARE_META_INTERFACE(DisplayEventConnection);
38 
39     /*
40      * getDataChannel() returns a BitTube where to receive the events from
41      */
42     virtual sp<BitTube> getDataChannel() const = 0;
43 
44     /*
45      * setVsyncRate() sets the vsync event delivery rate. A value of
46      * 1 returns every vsync events. A value of 2 returns every other events,
47      * etc... a value of 0 returns no event unless  requestNextVsync() has
48      * been called.
49      */
50     virtual void setVsyncRate(uint32_t count) = 0;
51 
52     /*
53      * requestNextVsync() schedules the next vsync event. It has no effect
54      * if the vsync rate is > 0.
55      */
56     virtual void requestNextVsync() = 0;    // asynchronous
57 };
58 
59 // ----------------------------------------------------------------------------
60 
61 class BnDisplayEventConnection : public BnInterface<IDisplayEventConnection>
62 {
63 public:
64     virtual status_t    onTransact( uint32_t code,
65                                     const Parcel& data,
66                                     Parcel* reply,
67                                     uint32_t flags = 0);
68 };
69 
70 // ----------------------------------------------------------------------------
71 }; // namespace android
72 
73 #endif // ANDROID_GUI_IDISPLAY_EVENT_CONNECTION_H
74