| // Copyright 2018 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef SRC_UI_LIB_ESCHER_UTIL_TRACER_H_ |
| #define SRC_UI_LIB_ESCHER_UTIL_TRACER_H_ |
| |
| #include <vector> |
| |
| #include "src/ui/lib/escher/util/stopwatch.h" |
| |
| namespace escher { |
| |
| // Trace support for Escher-on-Linux, used by the macros in trace_macros_impl.h. |
| // It can be instantiated on Fuchsia, but it won't be used. Upon construction, |
| // registers itself as a global, which can be obtained via GetTracer(). Upon |
| // destruction, writes an "escher.trace" JSON file, in the format expected by |
| // chrome://tracing. |
| class Tracer { |
| public: |
| Tracer(); |
| ~Tracer(); |
| void AddTraceEvent(char phase, const char* category, const char* name); |
| |
| struct Event { |
| char phase; |
| const char* category; |
| const char* name; |
| uint64_t microseconds; |
| }; |
| |
| private: |
| Stopwatch stopwatch_; |
| std::vector<Event> events_; |
| }; |
| |
| Tracer* GetTracer(); |
| |
| } // namespace escher |
| |
| #endif // SRC_UI_LIB_ESCHER_UTIL_TRACER_H_ |