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      1 /*
      2  * Copyright 2013 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 <stdint.h>
     18 #include <utils/Errors.h>
     19 #include <utils/Singleton.h>
     20 
     21 #ifndef ANDROID_SF_EVENTLOG_H
     22 #define ANDROID_SF_EVENTLOG_H
     23 
     24 // ---------------------------------------------------------------------------
     25 namespace android {
     26 // ---------------------------------------------------------------------------
     27 
     28 class String8;
     29 
     30 class EventLog : public Singleton<EventLog> {
     31 
     32 public:
     33     static void logFrameDurations(const String8& window,
     34             const int32_t* durations, size_t numDurations);
     35 
     36 protected:
     37     EventLog();
     38 
     39 private:
     40     /*
     41      * EventLogBuffer is a helper class to construct an in-memory event log
     42      * tag. In this version the buffer is not dynamic, so write operation can
     43      * fail if there is not enough space in the temporary buffer.
     44      * Once constructed, the buffer can be logger by calling the log()
     45      * method.
     46      */
     47 
     48     class TagBuffer {
     49         enum { STORAGE_MAX_SIZE = 128 };
     50         int32_t mPos;
     51         int32_t mTag;
     52         bool mOverflow;
     53         char mStorage[STORAGE_MAX_SIZE];
     54     public:
     55         explicit TagBuffer(int32_t tag);
     56 
     57         // starts list of items
     58         void startList(int8_t count);
     59         // terminates the list
     60         void endList();
     61         // write a 32-bit integer
     62         void writeInt32(int32_t value);
     63         // write a 64-bit integer
     64         void writeInt64(int64_t value);
     65         // write a C string
     66         void writeString8(const String8& value);
     67 
     68         // outputs the the buffer to the log
     69         void log();
     70     };
     71 
     72     friend class Singleton<EventLog>;
     73     EventLog(const EventLog&);
     74     EventLog& operator =(const EventLog&);
     75 
     76     enum { LOGTAG_SF_FRAME_DUR = 60100 };
     77     void doLogFrameDurations(const String8& window, const int32_t* durations,
     78             size_t numDurations);
     79 };
     80 
     81 // ---------------------------------------------------------------------------
     82 }// namespace android
     83 // ---------------------------------------------------------------------------
     84 
     85 #endif /* ANDROID_SF_EVENTLOG_H */
     86