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- /*
- * Copyright (C) 2014 Google Inc. All rights reserved.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkEventTracer_DEFINED
- #define SkEventTracer_DEFINED
- // The class in this header defines the interface between Skia's internal
- // tracing macros and an external entity (e.g., Chrome) that will consume them.
- // Such an entity should subclass SkEventTracer and provide an instance of
- // that event to SkEventTracer::SetInstance.
- // If you're looking for the tracing macros to instrument Skia itself, those
- // live in src/core/SkTraceEvent.h
- #include "include/core/SkTypes.h"
- class SK_API SkEventTracer {
- public:
- typedef uint64_t Handle;
- /**
- * If this is the first call to SetInstance or GetInstance then the passed instance is
- * installed and true is returned. Otherwise, false is returned. In either case ownership of the
- * tracer is transferred and it will be deleted when no longer needed.
- */
- static bool SetInstance(SkEventTracer*);
- /**
- * Gets the event tracer. If this is the first call to SetInstance or GetIntance then a default
- * event tracer is installed and returned.
- */
- static SkEventTracer* GetInstance();
- virtual ~SkEventTracer() { }
- // The pointer returned from GetCategoryGroupEnabled() points to a
- // value with zero or more of the following bits. Used in this class only.
- // The TRACE_EVENT macros should only use the value as a bool.
- // These values must be in sync with macro values in trace_event.h in chromium.
- enum CategoryGroupEnabledFlags {
- // Category group enabled for the recording mode.
- kEnabledForRecording_CategoryGroupEnabledFlags = 1 << 0,
- // Category group enabled for the monitoring mode.
- kEnabledForMonitoring_CategoryGroupEnabledFlags = 1 << 1,
- // Category group enabled by SetEventCallbackEnabled().
- kEnabledForEventCallback_CategoryGroupEnabledFlags = 1 << 2,
- };
- virtual const uint8_t* getCategoryGroupEnabled(const char* name) = 0;
- virtual const char* getCategoryGroupName(const uint8_t* categoryEnabledFlag) = 0;
- virtual SkEventTracer::Handle
- addTraceEvent(char phase,
- const uint8_t* categoryEnabledFlag,
- const char* name,
- uint64_t id,
- int32_t numArgs,
- const char** argNames,
- const uint8_t* argTypes,
- const uint64_t* argValues,
- uint8_t flags) = 0;
- virtual void
- updateTraceEventDuration(const uint8_t* categoryEnabledFlag,
- const char* name,
- SkEventTracer::Handle handle) = 0;
- };
- #endif // SkEventTracer_DEFINED
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