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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 {
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.
* Not deleting the tracer on process exit should not cause problems as
* the whole heap is about to go away with the process. This can also
* improve performance by reducing the amount of work needed.
* @param leakTracer Do not delete tracer on process exit.
static bool SetInstance(SkEventTracer*, bool leakTracer = false);
* 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() = default;
// 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;
SkEventTracer() = default;
SkEventTracer(const SkEventTracer&) = delete;
SkEventTracer& operator=(const SkEventTracer&) = delete;
#endif // SkEventTracer_DEFINED