1 /*
2  * Copyright 2017 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 #pragma once
18 
19 #include <layerproto/LayerProtoHeader.h>
20 #include <utils/Errors.h>
21 
22 #include <mutex>
23 
24 using namespace android::surfaceflinger;
25 
26 namespace android {
27 
28 /*
29  * SurfaceTracing records layer states during surface flinging.
30  */
31 class SurfaceTracing {
32 public:
33     void enable();
34     status_t disable();
35     bool isEnabled();
36 
37     void traceLayers(const char* where, LayersProto);
38 
39 private:
40     static constexpr auto DEFAULT_FILENAME = "/data/misc/wmtrace/layers_trace.pb";
41 
42     status_t writeProtoFileLocked();
43 
44     bool mEnabled = false;
45     std::string mOutputFileName = DEFAULT_FILENAME;
46     std::mutex mTraceMutex;
47     LayersTraceFileProto mTrace;
48 };
49 
50 } // namespace android
51