Timer.h revision 10805961ce424868e8315e00f6dbeeaa62d466ac 
1/*
2 * Copyright 2011 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#ifndef Timer_DEFINED
8#define Timer_DEFINED
9
10#include "SkTypes.h"
11
12#if defined(SK_BUILD_FOR_WIN32)
13    #include "SysTimer_windows.h"
14#elif defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
15    #include "SysTimer_mach.h"
16#elif defined(SK_BUILD_FOR_UNIX) || defined(SK_BUILD_FOR_ANDROID)
17    #include "SysTimer_posix.h"
18#endif
19
20#if SK_SUPPORT_GPU
21    #include "GpuTimer.h"
22#endif
23
24class SkGLContextHelper;
25
26/**
27 * SysTimers and GpuTimers are implemented orthogonally.
28 * This class combines 2 SysTimers and a GpuTimer into one single,
29 * platform specific Timer with a simple interface. The truncated
30 * timer doesn't include the time required for the GPU to finish
31 * its rendering. It should always be <= the un-truncated system
32 * times and (for GPU configurations) can be used to roughly (very
33 * roughly) gauge the GPU load/backlog.
34 */
35class Timer {
36public:
37    explicit Timer(SkGLContextHelper* gl = NULL);
38
39    void start();
40    void truncatedEnd();
41    void end();
42
43    // All times in milliseconds.
44    double fCpu;
45    double fWall;
46    double fTruncatedCpu;
47    double fTruncatedWall;
48    double fGpu;
49
50private:
51    SysTimer fSysTimer;
52    SysTimer fTruncatedSysTimer;
53#if SK_SUPPORT_GPU
54    GpuTimer fGpuTimer;
55#endif
56};
57
58// Same as Timer above, supporting only fWall but with much lower overhead.
59// (Typically, ~30ns instead of Timer's ~1us.)
60class WallTimer {
61public:
62    WallTimer();
63
64    void start();
65    void end();
66
67    double fWall;  // Milliseconds.
68
69private:
70    SysTimer fSysTimer;
71};
72
73#endif
74