michael@0: /*
michael@0:  * Copyright 2014 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "SkEventTracer.h"
michael@0: #include "SkOnce.h"
michael@0: 
michael@0: class SkDefaultEventTracer: public SkEventTracer {
michael@0:     virtual SkEventTracer::Handle
michael@0:         addTraceEvent(char phase,
michael@0:                       const uint8_t* categoryEnabledFlag,
michael@0:                       const char* name,
michael@0:                       uint64_t id,
michael@0:                       int numArgs,
michael@0:                       const char** argNames,
michael@0:                       const uint8_t* argTypes,
michael@0:                       const uint64_t* argValues,
michael@0:                       uint8_t flags) SK_OVERRIDE { return 0; }
michael@0: 
michael@0:     virtual void
michael@0:         updateTraceEventDuration(const uint8_t* categoryEnabledFlag,
michael@0:                                  const char* name,
michael@0:                                  SkEventTracer::Handle handle) SK_OVERRIDE {};
michael@0: 
michael@0:     virtual const uint8_t* getCategoryGroupEnabled(const char* name) SK_OVERRIDE {
michael@0:         static uint8_t no = 0;
michael@0:         return &no;
michael@0:     };
michael@0:     virtual const char* getCategoryGroupName(
michael@0:       const uint8_t* categoryEnabledFlag) SK_OVERRIDE {
michael@0:         static const char* dummy = "dummy";
michael@0:         return dummy;
michael@0:     };
michael@0: };
michael@0: 
michael@0: SkEventTracer *SkEventTracer::gInstance;
michael@0: 
michael@0: static void intialiize_default_tracer(void *current_instance) {
michael@0:     if (NULL == current_instance) {
michael@0:         SkEventTracer::SetInstance(SkNEW(SkDefaultEventTracer));
michael@0:     }
michael@0: }
michael@0: 
michael@0: static void cleanup_tracer() {
michael@0:     // calling SetInstance will delete the existing instance.
michael@0:     SkEventTracer::SetInstance(NULL);
michael@0: }
michael@0: 
michael@0: SkEventTracer* SkEventTracer::GetInstance() {
michael@0:     SK_DECLARE_STATIC_ONCE(once);
michael@0:     SkOnce(&once,
michael@0:            intialiize_default_tracer,
michael@0:            SkEventTracer::gInstance,
michael@0:            cleanup_tracer);
michael@0:     SkASSERT(NULL != SkEventTracer::gInstance);
michael@0:     return SkEventTracer::gInstance;
michael@0: }