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CLOSED TREE Backed out changeset d66c3f19a210 (bug 1235261) Backed out changeset 467d945426bb (bug 1235261) Backed out changeset 32b61df13142 (bug 1235261) Backed out changeset c50bb8ed4196 (bug 1235261) Backed out changeset 0ff0fa6fe81f (bug 1235261) Backed out changeset df70e89669da (bug 1235261) Backed out changeset 064969357fc9 (bug 1235261)
115 lines
4.1 KiB
C++
115 lines
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_layers_opengl_FPSCounter_h_
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#define mozilla_layers_opengl_FPSCounter_h_
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#include <algorithm> // for min
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#include <stddef.h> // for size_t
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#include <map> // for std::map
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#include "GLDefs.h" // for GLuint
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#include "mozilla/RefPtr.h" // for already_AddRefed, RefCounted
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#include "mozilla/TimeStamp.h" // for TimeStamp, TimeDuration
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#include "nsTArray.h" // for nsAutoTArray, nsTArray_Impl, etc
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#include "prio.h" // for NSPR file i/o
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namespace mozilla {
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namespace layers {
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class DataTextureSource;
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class Compositor;
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// Dump the FPS histogram every 10 seconds or kMaxFrameFPS
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const int kFpsDumpInterval = 10;
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// On desktop, we can have 240 hz monitors, so 10 seconds
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// times 240 frames = 2400
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const int kMaxFrames = 2400;
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/**
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* The FPSCounter tracks how often we composite or have a layer transaction.
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* At each composite / layer transaction, we record the timestamp.
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* After kFpsDumpInterval number of composites / transactions, we calculate
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* the average and standard deviation of frames composited. We dump a histogram,
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* which allows for more statistically significant measurements. We also dump
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* absolute frame composite times to a file on the device.
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* The FPS counters displayed on screen are based on how many frames we
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* composited within the last ~1 second. The more accurate measurement is to
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* grab the histogram from stderr or grab the FPS timestamp dumps written to file.
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*
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* To enable dumping to file, enable
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* layers.acceleration.draw-fps.write-to-file pref.
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double AddFrameAndGetFps(TimeStamp aCurrentFrame) {
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AddFrame(aCurrentFrame);
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return EstimateFps(aCurrentFrame);
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}
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* To enable printing histogram data to logcat,
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* enable layers.acceleration.draw-fps.print-histogram
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*
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* Use the HasNext(), GetNextTimeStamp() like an iterator to read the data,
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* backwards in time. This abstracts away the mechanics of reading the data.
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*/
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class FPSCounter {
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public:
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explicit FPSCounter(const char* aName);
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~FPSCounter();
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void AddFrame(TimeStamp aTimestamp);
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double AddFrameAndGetFps(TimeStamp aTimestamp);
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double GetFPS(TimeStamp aTimestamp);
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private:
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void Init();
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bool CapturedFullInterval(TimeStamp aTimestamp);
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// Used while iterating backwards over the data
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void ResetReverseIterator();
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bool HasNext(TimeStamp aTimestamp, double aDuration = kFpsDumpInterval);
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TimeStamp GetNextTimeStamp();
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int GetLatestReadIndex();
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TimeStamp GetLatestTimeStamp();
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void WriteFrameTimeStamps(PRFileDesc* fd);
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bool IteratedFullInterval(TimeStamp aTimestamp, double aDuration);
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void PrintFPS();
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int BuildHistogram(std::map<int, int>& aHistogram);
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void PrintHistogram(std::map<int, int>& aHistogram);
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double GetMean(std::map<int,int> aHistogram);
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double GetStdDev(std::map<int, int> aHistogram);
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nsresult WriteFrameTimeStamps();
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/***
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* mFrameTimestamps is a psuedo circular buffer
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* Since we have a constant write time and don't
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* read at an offset except our latest write
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* we don't need an explicit read pointer.
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*/
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nsAutoTArray<TimeStamp, kMaxFrames> mFrameTimestamps;
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int mWriteIndex; // points to next open write slot
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int mIteratorIndex; // used only when iterating
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const char* mFPSName;
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TimeStamp mLastInterval;
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};
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struct FPSState {
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FPSState();
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void DrawFPS(TimeStamp, int offsetX, int offsetY, unsigned, Compositor* aCompositor);
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void NotifyShadowTreeTransaction() {
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mTransactionFps.AddFrame(TimeStamp::Now());
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}
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FPSCounter mCompositionFps;
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FPSCounter mTransactionFps;
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private:
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RefPtr<DataTextureSource> mFPSTextureSource;
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};
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} // namespace layers
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} // namespace mozilla
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#endif // mozilla_layers_opengl_FPSCounter_h_
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