gfx/layers/composite/FPSCounter.h@97036ab72558 (annotated)
gfx/layers/composite/FPSCounter.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
| michael@0 | 2 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #ifndef mozilla_layers_opengl_FPSCounter_h_ |
| michael@0 | 7 | #define mozilla_layers_opengl_FPSCounter_h_ |
| michael@0 | 8 | |
| michael@0 | 9 | #include <stddef.h> // for size_t |
| michael@0 | 10 | #include <algorithm> // for min |
| michael@0 | 11 | #include "GLDefs.h" // for GLuint |
| michael@0 | 12 | #include "mozilla/TimeStamp.h" // for TimeStamp, TimeDuration |
| michael@0 | 13 | #include "nsTArray.h" // for nsAutoTArray, nsTArray_Impl, etc |
| michael@0 | 14 | #include "VBOArena.h" // for gl::VBOArena |
| michael@0 | 15 | |
| michael@0 | 16 | namespace mozilla { |
| michael@0 | 17 | namespace gl { |
| michael@0 | 18 | class GLContext; |
| michael@0 | 19 | } |
| michael@0 | 20 | namespace layers { |
| michael@0 | 21 | |
| michael@0 | 22 | class DataTextureSource; |
| michael@0 | 23 | class ShaderProgramOGL; |
| michael@0 | 24 | |
| michael@0 | 25 | const double kFpsWindowMs = 250.0; |
| michael@0 | 26 | const size_t kNumFrameTimeStamps = 16; |
| michael@0 | 27 | struct FPSCounter { |
| michael@0 | 28 | FPSCounter() : mCurrentFrameIndex(0) { |
| michael@0 | 29 | mFrames.SetLength(kNumFrameTimeStamps); |
| michael@0 | 30 | } |
| michael@0 | 31 | |
| michael@0 | 32 | // We keep a circular buffer of the time points at which the last K |
| michael@0 | 33 | // frames were drawn. To estimate FPS, we count the number of |
| michael@0 | 34 | // frames we've drawn within the last kFPSWindowMs milliseconds and |
| michael@0 | 35 | // divide by the amount time since the first of those frames. |
| michael@0 | 36 | nsAutoTArray<TimeStamp, kNumFrameTimeStamps> mFrames; |
| michael@0 | 37 | size_t mCurrentFrameIndex; |
| michael@0 | 38 | |
| michael@0 | 39 | void AddFrame(TimeStamp aNewFrame) { |
| michael@0 | 40 | mFrames[mCurrentFrameIndex] = aNewFrame; |
| michael@0 | 41 | mCurrentFrameIndex = (mCurrentFrameIndex + 1) % kNumFrameTimeStamps; |
| michael@0 | 42 | } |
| michael@0 | 43 | |
| michael@0 | 44 | double AddFrameAndGetFps(TimeStamp aCurrentFrame) { |
| michael@0 | 45 | AddFrame(aCurrentFrame); |
| michael@0 | 46 | return EstimateFps(aCurrentFrame); |
| michael@0 | 47 | } |
| michael@0 | 48 | |
| michael@0 | 49 | double GetFpsAt(TimeStamp aNow) { |
| michael@0 | 50 | return EstimateFps(aNow); |
| michael@0 | 51 | } |
| michael@0 | 52 | |
| michael@0 | 53 | private: |
| michael@0 | 54 | double EstimateFps(TimeStamp aNow) { |
| michael@0 | 55 | TimeStamp beginningOfWindow = |
| michael@0 | 56 | (aNow - TimeDuration::FromMilliseconds(kFpsWindowMs)); |
| michael@0 | 57 | TimeStamp earliestFrameInWindow = aNow; |
| michael@0 | 58 | size_t numFramesDrawnInWindow = 0; |
| michael@0 | 59 | for (size_t i = 0; i < kNumFrameTimeStamps; ++i) { |
| michael@0 | 60 | const TimeStamp& frame = mFrames[i]; |
| michael@0 | 61 | if (!frame.IsNull() && frame > beginningOfWindow) { |
| michael@0 | 62 | ++numFramesDrawnInWindow; |
| michael@0 | 63 | earliestFrameInWindow = std::min(earliestFrameInWindow, frame); |
| michael@0 | 64 | } |
| michael@0 | 65 | } |
| michael@0 | 66 | double realWindowSecs = (aNow - earliestFrameInWindow).ToSeconds(); |
| michael@0 | 67 | if (realWindowSecs == 0.0 || numFramesDrawnInWindow == 1) { |
| michael@0 | 68 | return 0.0; |
| michael@0 | 69 | } |
| michael@0 | 70 | return double(numFramesDrawnInWindow - 1) / realWindowSecs; |
| michael@0 | 71 | } |
| michael@0 | 72 | }; |
| michael@0 | 73 | |
| michael@0 | 74 | struct FPSState { |
| michael@0 | 75 | FPSCounter mCompositionFps; |
| michael@0 | 76 | FPSCounter mTransactionFps; |
| michael@0 | 77 | |
| michael@0 | 78 | FPSState() {} |
| michael@0 | 79 | |
| michael@0 | 80 | void DrawFPS(TimeStamp, unsigned, Compositor* aCompositor); |
| michael@0 | 81 | |
| michael@0 | 82 | void NotifyShadowTreeTransaction() { |
| michael@0 | 83 | mTransactionFps.AddFrame(TimeStamp::Now()); |
| michael@0 | 84 | } |
| michael@0 | 85 | |
| michael@0 | 86 | private: |
| michael@0 | 87 | RefPtr<DataTextureSource> mFPSTextureSource; |
| michael@0 | 88 | }; |
| michael@0 | 89 | |
| michael@0 | 90 | } |
| michael@0 | 91 | } |
| michael@0 | 92 | |
| michael@0 | 93 | #endif // mozilla_layers_opengl_FPSCounter_h_ |
