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| 1 /* |
| 2 * Copyright (C) 2014 Google Inc. All rights reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef SkEventTracer_DEFINED |
| 9 #define SkEventTracer_DEFINED |
| 10 |
| 11 // The class in this header defines the interface between Skia's internal |
| 12 // tracing macros and an external entity (e.g., Chrome) that will consume them. |
| 13 // Such an entity should subclass SkEventTracer and provide an instance of |
| 14 // that event to SkEventTracer::SetInstance. |
| 15 |
| 16 // If you're looking for the tracing macros to instrument Skia itself, those |
| 17 // live in src/core/SkTraceEvent.h |
| 18 |
| 19 #include "SkTypes.h" |
| 20 |
| 21 // This will mark the trace event as disabled by default. The user will need |
| 22 // to explicitly enable the event. |
| 23 #define TRACE_DISABLED_BY_DEFAULT(name) "disabled-by-default-" name |
| 24 |
| 25 class SK_API SkEventTracer { |
| 26 public: |
| 27 |
| 28 typedef uint32_t Handle; |
| 29 |
| 30 static SkEventTracer* GetInstance(); |
| 31 |
| 32 static void SetInstance(SkEventTracer* tracer) { |
| 33 SkDELETE(SkEventTracer::gInstance); |
| 34 SkEventTracer::gInstance = tracer; |
| 35 } |
| 36 |
| 37 virtual ~SkEventTracer() { } |
| 38 |
| 39 // The pointer returned from GetCategoryGroupEnabled() points to a |
| 40 // value with zero or more of the following bits. Used in this class only. |
| 41 // The TRACE_EVENT macros should only use the value as a bool. |
| 42 // These values must be in sync with macro values in trace_event.h in chromi
um. |
| 43 enum CategoryGroupEnabledFlags { |
| 44 // Category group enabled for the recording mode. |
| 45 kEnabledForRecording_CategoryGroupEnabledFlags = 1 << 0, |
| 46 // Category group enabled for the monitoring mode. |
| 47 kEnabledForMonitoring_CategoryGroupEnabledFlags = 1 << 1, |
| 48 // Category group enabled by SetEventCallbackEnabled(). |
| 49 kEnabledForEventCallback_CategoryGroupEnabledFlags = 1 << 2, |
| 50 }; |
| 51 |
| 52 virtual const unsigned char* getCategoryGroupEnabled(const char* name) = 0; |
| 53 virtual const char* getCategoryGroupName( |
| 54 const uint8_t* category_group_enabled) = 0; |
| 55 |
| 56 virtual SkEventTracer::Handle |
| 57 addTraceEvent(char phase, |
| 58 const uint8_t* categoryEnabledFlag, |
| 59 const char* name, |
| 60 uint64_t id, |
| 61 int32_t numArgs, |
| 62 const char** argNames, |
| 63 const uint8_t* argTypes, |
| 64 const uint64_t* argValues, |
| 65 uint8_t flags) = 0; |
| 66 |
| 67 virtual void |
| 68 updateTraceEventDuration(const uint8_t* categoryEnabledFlag, |
| 69 const char* name, |
| 70 SkEventTracer::Handle) = 0; |
| 71 private: |
| 72 static SkEventTracer *gInstance; |
| 73 }; |
| 74 |
| 75 #endif // SkEventTracer_DEFINED |
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