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