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      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