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-rw-r--r--gfx/layers/composite/FPSCounter.cpp450
1 files changed, 450 insertions, 0 deletions
diff --git a/gfx/layers/composite/FPSCounter.cpp b/gfx/layers/composite/FPSCounter.cpp
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+++ b/gfx/layers/composite/FPSCounter.cpp
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stddef.h> // for size_t
+#include "Units.h" // for ScreenIntRect
+#include "gfxRect.h" // for gfxRect
+#include "gfxPrefs.h" // for gfxPrefs
+#include "mozilla/gfx/Point.h" // for IntSize, Point
+#include "mozilla/gfx/Rect.h" // for Rect
+#include "mozilla/gfx/Types.h" // for Color, SurfaceFormat
+#include "mozilla/layers/Compositor.h" // for Compositor
+#include "mozilla/layers/CompositorTypes.h"
+#include "mozilla/layers/Effects.h" // for Effect, EffectChain, etc
+#include "mozilla/TimeStamp.h" // for TimeStamp, TimeDuration
+#include "nsPoint.h" // for nsIntPoint
+#include "nsRect.h" // for mozilla::gfx::IntRect
+#include "nsIFile.h" // for nsIFile
+#include "nsDirectoryServiceDefs.h" // for NS_OS_TMP_DIR
+#include "mozilla/Sprintf.h"
+#include "FPSCounter.h"
+
+namespace mozilla {
+namespace layers {
+
+using namespace mozilla::gfx;
+
+FPSCounter::FPSCounter(const char* aName)
+ : mWriteIndex(0)
+ , mIteratorIndex(-1)
+ , mFPSName(aName)
+{
+ Init();
+}
+
+FPSCounter::~FPSCounter() { }
+
+void
+FPSCounter::Init()
+{
+ for (int i = 0; i < kMaxFrames; i++) {
+ mFrameTimestamps.AppendElement(TimeStamp());
+ }
+ mLastInterval = TimeStamp::Now();
+}
+
+// Returns true if we captured a full interval of data
+bool
+FPSCounter::CapturedFullInterval(TimeStamp aTimestamp) {
+ TimeDuration duration = aTimestamp - mLastInterval;
+ return duration.ToSeconds() >= kFpsDumpInterval;
+}
+
+void
+FPSCounter::AddFrame(TimeStamp aTimestamp) {
+ NS_ASSERTION(mWriteIndex < kMaxFrames, "We probably have a bug with the circular buffer");
+ NS_ASSERTION(mWriteIndex >= 0, "Circular Buffer index should never be negative");
+
+ int index = mWriteIndex++;
+ if (mWriteIndex == kMaxFrames) {
+ mWriteIndex = 0;
+ }
+
+ mFrameTimestamps[index] = aTimestamp;
+
+ if (CapturedFullInterval(aTimestamp)) {
+ PrintFPS();
+ WriteFrameTimeStamps();
+ mLastInterval = aTimestamp;
+ }
+}
+
+double
+FPSCounter::AddFrameAndGetFps(TimeStamp aTimestamp) {
+ AddFrame(aTimestamp);
+ return GetFPS(aTimestamp);
+}
+
+int
+FPSCounter::GetLatestReadIndex()
+{
+ if (mWriteIndex == 0) {
+ return kMaxFrames - 1;
+ }
+
+ return mWriteIndex - 1;
+}
+
+TimeStamp
+FPSCounter::GetLatestTimeStamp()
+{
+ TimeStamp timestamp = mFrameTimestamps[GetLatestReadIndex()];
+ MOZ_ASSERT(!timestamp.IsNull(), "Cannot use null timestamps");
+ return timestamp;
+}
+
+// Returns true if we iterated over a full interval of data
+bool
+FPSCounter::IteratedFullInterval(TimeStamp aTimestamp, double aDuration) {
+ MOZ_ASSERT(mIteratorIndex >= 0, "Cannot be negative");
+ MOZ_ASSERT(mIteratorIndex < kMaxFrames, "Iterator index cannot be greater than kMaxFrames");
+
+ TimeStamp currentStamp = mFrameTimestamps[mIteratorIndex];
+ TimeDuration duration = aTimestamp - currentStamp;
+ return duration.ToSeconds() >= aDuration;
+}
+
+void
+FPSCounter::ResetReverseIterator()
+{
+ mIteratorIndex = GetLatestReadIndex();
+}
+
+/***
+ * Returns true if we have another timestamp that is valid and
+ * is within the given duration that we're interested in.
+ * Duration is in seconds
+ */
+bool FPSCounter::HasNext(TimeStamp aTimestamp, double aDuration)
+{
+ // Order of evaluation here has to stay the same
+ // otherwise IteratedFullInterval reads from mFrameTimestamps which cannot
+ // be null
+ return (mIteratorIndex != mWriteIndex) // Didn't loop around the buffer
+ && !mFrameTimestamps[mIteratorIndex].IsNull() // valid data
+ && !IteratedFullInterval(aTimestamp, aDuration);
+}
+
+TimeStamp
+FPSCounter::GetNextTimeStamp()
+{
+ TimeStamp timestamp = mFrameTimestamps[mIteratorIndex--];
+ MOZ_ASSERT(!timestamp.IsNull(), "Reading Invalid Timestamp Data");
+
+ if (mIteratorIndex == -1) {
+ mIteratorIndex = kMaxFrames - 1;
+ }
+ return timestamp;
+}
+
+/**
+ * GetFPS calculates how many frames we've already composited from the current
+ * frame timestamp and we iterate from the latest timestamp we recorded,
+ * going back in time. When we hit a frame that is longer than the 1 second
+ * from the current composited frame, we return how many frames we've counted.
+ * Just a visualization:
+ *
+ * aTimestamp
+ * Frames: 1 2 3 4 5 6 7 8 9 10 11 12
+ * Time -------------------------->
+ *
+ * GetFPS iterates from aTimestamp, which is the current frame.
+ * Then starting at frame 12, going back to frame 11, 10, etc, we calculate
+ * the duration of the recorded frame timestamp from aTimestamp.
+ * Once duration is greater than 1 second, we return how many frames
+ * we composited.
+ */
+double
+FPSCounter::GetFPS(TimeStamp aTimestamp)
+{
+ int frameCount = 0;
+ int duration = 1.0; // Only care about the last 1s of data
+
+ ResetReverseIterator();
+ while (HasNext(aTimestamp, duration)) {
+ GetNextTimeStamp();
+ frameCount++;
+ }
+
+ return frameCount;
+}
+
+// Iterate the same way we do in GetFPS()
+int
+FPSCounter::BuildHistogram(std::map<int, int>& aFpsData)
+{
+ TimeStamp currentIntervalStart = GetLatestTimeStamp();
+ TimeStamp currentTimeStamp = GetLatestTimeStamp();
+ TimeStamp startTimeStamp = GetLatestTimeStamp();
+
+ int frameCount = 0;
+ int totalFrameCount = 0;
+
+ ResetReverseIterator();
+ while (HasNext(startTimeStamp)) {
+ currentTimeStamp = GetNextTimeStamp();
+ TimeDuration interval = currentIntervalStart - currentTimeStamp;
+
+ if (interval.ToSeconds() >= 1.0 ) {
+ currentIntervalStart = currentTimeStamp;
+ aFpsData[frameCount]++;
+ frameCount = 0;
+ }
+
+ frameCount++;
+ totalFrameCount++;
+ }
+
+ TimeDuration totalTime = currentIntervalStart - currentTimeStamp;
+ printf_stderr("Discarded %d frames over %f ms in histogram for %s\n",
+ frameCount, totalTime.ToMilliseconds(), mFPSName);
+ return totalFrameCount;
+}
+
+// Iterate the same way we do in GetFPS()
+void
+FPSCounter::WriteFrameTimeStamps(PRFileDesc* fd)
+{
+ const int bufferSize = 256;
+ char buffer[bufferSize];
+ int writtenCount = SprintfLiteral(buffer, "FPS Data for: %s\n", mFPSName);
+ MOZ_ASSERT(writtenCount >= 0);
+ PR_Write(fd, buffer, writtenCount);
+
+ ResetReverseIterator();
+ TimeStamp startTimeStamp = GetLatestTimeStamp();
+
+ MOZ_ASSERT(HasNext(startTimeStamp));
+ TimeStamp previousSample = GetNextTimeStamp();
+
+ MOZ_ASSERT(HasNext(startTimeStamp));
+ TimeStamp nextTimeStamp = GetNextTimeStamp();
+
+ while (HasNext(startTimeStamp)) {
+ TimeDuration duration = previousSample - nextTimeStamp;
+ writtenCount = SprintfLiteral(buffer, "%f,\n", duration.ToMilliseconds());
+
+ MOZ_ASSERT(writtenCount >= 0);
+ PR_Write(fd, buffer, writtenCount);
+
+ previousSample = nextTimeStamp;
+ nextTimeStamp = GetNextTimeStamp();
+ }
+}
+
+double
+FPSCounter::GetMean(std::map<int, int> aHistogram)
+{
+ double average = 0.0;
+ double samples = 0.0;
+
+ for (std::map<int, int>::iterator iter = aHistogram.begin();
+ iter != aHistogram.end(); ++iter)
+ {
+ int fps = iter->first;
+ int count = iter->second;
+
+ average += fps * count;
+ samples += count;
+ }
+
+ return average / samples;
+}
+
+double
+FPSCounter::GetStdDev(std::map<int, int> aHistogram)
+{
+ double sumOfDifferences = 0;
+ double average = GetMean(aHistogram);
+ double samples = 0.0;
+
+ for (std::map<int, int>::iterator iter = aHistogram.begin();
+ iter != aHistogram.end(); ++iter)
+ {
+ int fps = iter->first;
+ int count = iter->second;
+
+ double diff = ((double) fps) - average;
+ diff *= diff;
+
+ for (int i = 0; i < count; i++) {
+ sumOfDifferences += diff;
+ }
+ samples += count;
+ }
+
+ double stdDev = sumOfDifferences / samples;
+ return sqrt(stdDev);
+}
+
+void
+FPSCounter::PrintFPS()
+{
+ if (!gfxPrefs::FPSPrintHistogram()) {
+ return;
+ }
+
+ std::map<int, int> histogram;
+ int totalFrames = BuildHistogram(histogram);
+
+ TimeDuration measurementInterval = mFrameTimestamps[GetLatestReadIndex()] - mLastInterval;
+ printf_stderr("FPS for %s. Total Frames: %d Time Interval: %f seconds\n",
+ mFPSName, totalFrames, measurementInterval.ToSecondsSigDigits());
+
+ PrintHistogram(histogram);
+}
+
+void
+FPSCounter::PrintHistogram(std::map<int, int>& aHistogram)
+{
+ int length = 0;
+ const int kBufferLength = 512;
+ char buffer[kBufferLength];
+
+ for (std::map<int, int>::iterator iter = aHistogram.begin();
+ iter != aHistogram.end(); iter++)
+ {
+ int fps = iter->first;
+ int count = iter->second;
+
+ length += snprintf(buffer + length, kBufferLength - length,
+ "FPS: %d = %d. ", fps, count);
+ NS_ASSERTION(length >= kBufferLength, "Buffer overrun while printing FPS histogram.");
+ }
+
+ printf_stderr("%s\n", buffer);
+ printf_stderr("Mean: %f , std dev %f\n", GetMean(aHistogram), GetStdDev(aHistogram));
+}
+
+// Write FPS timestamp data to a file only if
+// draw-fps.write-to-file is true
+nsresult
+FPSCounter::WriteFrameTimeStamps()
+{
+ if (!gfxPrefs::WriteFPSToFile()) {
+ return NS_OK;
+ }
+
+ MOZ_ASSERT(mWriteIndex == 0);
+
+ nsCOMPtr<nsIFile> resultFile;
+ nsresult rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(resultFile));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ if (!strncmp(mFPSName, "Compositor", strlen(mFPSName))) {
+ resultFile->Append(NS_LITERAL_STRING("fps.txt"));
+ } else {
+ resultFile->Append(NS_LITERAL_STRING("txn.txt"));
+ }
+
+ PRFileDesc* fd = nullptr;
+ int mode = 644;
+ int openFlags = PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE;
+ rv = resultFile->OpenNSPRFileDesc(openFlags, mode, &fd);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ WriteFrameTimeStamps(fd);
+ PR_Close(fd);
+
+ nsAutoCString path;
+ rv = resultFile->GetNativePath(path);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ printf_stderr("Wrote FPS data to file: %s\n", path.get());
+ return NS_OK;
+}
+
+FPSState::FPSState()
+ : mCompositionFps("Compositor")
+ , mTransactionFps("LayerTransactions")
+{
+}
+
+// Size of the builtin font.
+static const float FontHeight = 7.f;
+static const float FontWidth = 4.f;
+
+// Scale the font when drawing it to the viewport for better readability.
+static const float FontScaleX = 2.f;
+static const float FontScaleY = 3.f;
+
+static void DrawDigits(unsigned int aValue,
+ int aOffsetX, int aOffsetY,
+ Compositor* aCompositor,
+ EffectChain& aEffectChain)
+{
+ if (aValue > 999) {
+ aValue = 999;
+ }
+
+ unsigned int divisor = 100;
+ float textureWidth = FontWidth * 10;
+ gfx::Float opacity = 1;
+ gfx::Matrix4x4 transform;
+ transform.PreScale(FontScaleX, FontScaleY, 1);
+
+ for (size_t n = 0; n < 3; ++n) {
+ unsigned int digit = aValue % (divisor * 10) / divisor;
+ divisor /= 10;
+
+ RefPtr<TexturedEffect> texturedEffect = static_cast<TexturedEffect*>(aEffectChain.mPrimaryEffect.get());
+ texturedEffect->mTextureCoords = Rect(float(digit * FontWidth) / textureWidth, 0, FontWidth / textureWidth, 1.0f);
+
+ Rect drawRect = Rect(aOffsetX + n * FontWidth, aOffsetY, FontWidth, FontHeight);
+ IntRect clipRect = IntRect(0, 0, 300, 100);
+ aCompositor->DrawQuad(drawRect, clipRect, aEffectChain, opacity, transform);
+ }
+}
+
+void FPSState::DrawFPS(TimeStamp aNow,
+ int aOffsetX, int aOffsetY,
+ unsigned int aFillRatio,
+ Compositor* aCompositor)
+{
+ if (!mFPSTextureSource) {
+ const char *text =
+ " "
+ " XXX XX XXX XXX X X XXX XXX XXX XXX XXX"
+ " X X X X X X X X X X X X X X"
+ " X X X XXX XXX XXX XXX XXX X XXX XXX"
+ " X X X X X X X X X X X X X"
+ " XXX XXX XXX XXX X XXX XXX X XXX X"
+ " ";
+
+ // Convert the text encoding above to RGBA.
+ int w = FontWidth * 10;
+ int h = FontHeight;
+ uint32_t* buf = (uint32_t *) malloc(w * h * sizeof(uint32_t));
+ for (int i = 0; i < h; i++) {
+ for (int j = 0; j < w; j++) {
+ uint32_t purple = 0xfff000ff;
+ uint32_t white = 0xffffffff;
+ buf[i * w + j] = (text[i * w + j] == ' ') ? purple : white;
+ }
+ }
+
+ int bytesPerPixel = 4;
+ RefPtr<DataSourceSurface> fpsSurface = Factory::CreateWrappingDataSourceSurface(
+ reinterpret_cast<uint8_t*>(buf), w * bytesPerPixel, IntSize(w, h), SurfaceFormat::B8G8R8A8);
+ mFPSTextureSource = aCompositor->CreateDataTextureSource();
+ mFPSTextureSource->Update(fpsSurface);
+ }
+
+ EffectChain effectChain;
+ effectChain.mPrimaryEffect = CreateTexturedEffect(SurfaceFormat::B8G8R8A8,
+ mFPSTextureSource,
+ SamplingFilter::POINT,
+ true);
+
+ unsigned int fps = unsigned(mCompositionFps.AddFrameAndGetFps(aNow));
+ unsigned int txnFps = unsigned(mTransactionFps.GetFPS(aNow));
+
+ DrawDigits(fps, aOffsetX + 0, aOffsetY, aCompositor, effectChain);
+ DrawDigits(txnFps, aOffsetX + FontWidth * 4, aOffsetY, aCompositor, effectChain);
+ DrawDigits(aFillRatio, aOffsetX + FontWidth * 8, aOffsetY, aCompositor, effectChain);
+}
+
+} // end namespace layers
+} // end namespace mozilla
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