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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 #include <gui/IDisplayEventConnection.h>
     18 
     19 #include <private/gui/BitTube.h>
     20 
     21 namespace android {
     22 
     23 namespace { // Anonymous
     24 
     25 enum class Tag : uint32_t {
     26     STEAL_RECEIVE_CHANNEL = IBinder::FIRST_CALL_TRANSACTION,
     27     SET_VSYNC_RATE,
     28     REQUEST_NEXT_VSYNC,
     29     LAST = REQUEST_NEXT_VSYNC,
     30 };
     31 
     32 } // Anonymous namespace
     33 
     34 class BpDisplayEventConnection : public SafeBpInterface<IDisplayEventConnection> {
     35 public:
     36     explicit BpDisplayEventConnection(const sp<IBinder>& impl)
     37           : SafeBpInterface<IDisplayEventConnection>(impl, "BpDisplayEventConnection") {}
     38 
     39     ~BpDisplayEventConnection() override;
     40 
     41     status_t stealReceiveChannel(gui::BitTube* outChannel) override {
     42         return callRemote<decltype(
     43                 &IDisplayEventConnection::stealReceiveChannel)>(Tag::STEAL_RECEIVE_CHANNEL,
     44                                                                 outChannel);
     45     }
     46 
     47     status_t setVsyncRate(uint32_t count) override {
     48         return callRemote<decltype(&IDisplayEventConnection::setVsyncRate)>(Tag::SET_VSYNC_RATE,
     49                                                                             count);
     50     }
     51 
     52     void requestNextVsync() override {
     53         callRemoteAsync<decltype(&IDisplayEventConnection::requestNextVsync)>(
     54                 Tag::REQUEST_NEXT_VSYNC);
     55     }
     56 };
     57 
     58 // Out-of-line virtual method definition to trigger vtable emission in this translation unit (see
     59 // clang warning -Wweak-vtables)
     60 BpDisplayEventConnection::~BpDisplayEventConnection() = default;
     61 
     62 IMPLEMENT_META_INTERFACE(DisplayEventConnection, "android.gui.DisplayEventConnection");
     63 
     64 status_t BnDisplayEventConnection::onTransact(uint32_t code, const Parcel& data, Parcel* reply,
     65                                               uint32_t flags) {
     66     if (code < IBinder::FIRST_CALL_TRANSACTION || code > static_cast<uint32_t>(Tag::LAST)) {
     67         return BBinder::onTransact(code, data, reply, flags);
     68     }
     69     auto tag = static_cast<Tag>(code);
     70     switch (tag) {
     71         case Tag::STEAL_RECEIVE_CHANNEL:
     72             return callLocal(data, reply, &IDisplayEventConnection::stealReceiveChannel);
     73         case Tag::SET_VSYNC_RATE:
     74             return callLocal(data, reply, &IDisplayEventConnection::setVsyncRate);
     75         case Tag::REQUEST_NEXT_VSYNC:
     76             return callLocalAsync(data, reply, &IDisplayEventConnection::requestNextVsync);
     77     }
     78 }
     79 
     80 } // namespace android
     81