SkEventTracer.cpp revision da5c6d64b05813660fa578cb5f8ef0dd146726f4 
1/*
2 * Copyright 2014 Google Inc.
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#include "SkEventTracer.h"
9#include "SkOnce.h"
10
11class SkDefaultEventTracer: public SkEventTracer {
12    virtual SkEventTracer::Handle
13        addTraceEvent(char phase,
14                      const uint8_t* categoryEnabledFlag,
15                      const char* name,
16                      uint64_t id,
17                      int numArgs,
18                      const char** argNames,
19                      const uint8_t* argTypes,
20                      const uint64_t* argValues,
21                      uint8_t flags) SK_OVERRIDE { return 0; }
22
23    virtual void
24        updateTraceEventDuration(const uint8_t* categoryEnabledFlag,
25                                 const char* name,
26                                 SkEventTracer::Handle handle) SK_OVERRIDE {};
27
28    virtual const uint8_t* getCategoryGroupEnabled(const char* name) SK_OVERRIDE {
29        static uint8_t no = 0;
30        return &no;
31    };
32    virtual const char* getCategoryGroupName(
33      const uint8_t* category_group_enabled) SK_OVERRIDE {
34        static const char* dummy = "dummy";
35        return dummy;
36    };
37};
38
39SkEventTracer *SkEventTracer::gInstance;
40
41static void intialiize_default_tracer(void *current_instance) {
42    if (NULL == current_instance) {
43        SkEventTracer::SetInstance(SkNEW(SkDefaultEventTracer));
44    }
45}
46
47static void cleanup_tracer() {
48    // calling SetInstance will delete the existing instance.
49    SkEventTracer::SetInstance(NULL);
50}
51
52SkEventTracer* SkEventTracer::GetInstance() {
53    SK_DECLARE_STATIC_ONCE(once);
54    SkOnce(&once,
55           intialiize_default_tracer,
56           SkEventTracer::gInstance,
57           cleanup_tracer);
58    SkASSERT(NULL != SkEventTracer::gInstance);
59    return SkEventTracer::gInstance;
60}
61