dab246
133 lines
3.6 KiB
Dart
133 lines
3.6 KiB
Dart
import 'dart:collection';
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import 'dart:ui';
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import 'package:core/core.dart';
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import 'package:flutter/scheduler.dart';
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/// FpsManager callback.
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typedef FpsCallback = void Function(FpsInfo fpsInfo);
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class FpsManager {
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FpsManager._();
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factory FpsManager() => _instance ??= FpsManager._();
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static FpsManager? _instance;
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/// Threshold time consuming per frame
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/// 1000/60hz ≈ 16.6ms 1000/120hz ≈ 8.3ms
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Duration _thresholdPerFrame = Duration(microseconds: Duration.microsecondsPerSecond ~/ 60);
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/// Refresh rate, default 60
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double _refreshRate = 60;
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/// Set refresh rate
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set refreshRate(double rate) {
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if (rate != _refreshRate && rate >= 60) {
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_refreshRate = rate;
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_thresholdPerFrame = Duration(microseconds: Duration.microsecondsPerSecond ~/ _refreshRate);
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}
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}
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bool _started = false;
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List<FpsCallback> _fpsCallbacks = [];
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/// Temporarily save 120 frames
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static const int _queue_capacity = 120;
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final ListQueue framesQueue = ListQueue<FrameTiming>(_queue_capacity);
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void addFpsCallback(FpsCallback callback) {
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_fpsCallbacks.add(callback);
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}
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void removeFpsCallback(FpsCallback callback) {
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assert(_fpsCallbacks.contains(callback));
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_fpsCallbacks.remove(callback);
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}
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void start() async {
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if (BuildUtils.isDebugMode || BuildUtils.isProfileMode) {
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if (!_started) {
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SchedulerBinding.instance.addTimingsCallback(_onTimingsCallback);
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_started = true;
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}
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}
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}
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void stop() {
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if (BuildUtils.isDebugMode || BuildUtils.isProfileMode) {
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if (_started) {
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SchedulerBinding.instance.removeTimingsCallback(_onTimingsCallback);
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_started = false;
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}
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}
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}
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_onTimingsCallback(List<FrameTiming> timings) async {
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if (_fpsCallbacks.isNotEmpty) {
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for (FrameTiming timing in timings) {
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framesQueue.addFirst(timing);
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}
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while (framesQueue.length > _queue_capacity) {
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framesQueue.removeLast();
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}
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List<FrameTiming> drawFrames = [];
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for (FrameTiming timing in framesQueue) {
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if (drawFrames.isEmpty) {
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drawFrames.add(timing);
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} else {
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int lastStart =
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drawFrames.last.timestampInMicroseconds(FramePhase.vsyncStart);
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int interval = lastStart -
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timing.timestampInMicroseconds(FramePhase.rasterFinish);
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if (interval > (_thresholdPerFrame.inMicroseconds * 2)) {
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// maybe in different set
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break;
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}
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drawFrames.add(timing);
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}
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}
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framesQueue.clear();
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// compute total frames count.
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int totalCount = drawFrames.map((frame) {
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// If droppedCount > 0,
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int droppedCount = frame.totalSpan.inMicroseconds ~/ _thresholdPerFrame.inMicroseconds;
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return droppedCount + 1;
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}).fold(0, (a, b) => a + b);
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int drawFramesCount = drawFrames.length;
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int droppedCount = totalCount - drawFramesCount;
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double fps = drawFramesCount / totalCount * _refreshRate;
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FpsInfo fpsInfo = FpsInfo(fps, totalCount, droppedCount, drawFramesCount);
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_fpsCallbacks.forEach((callBack) {
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callBack(fpsInfo);
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});
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}
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}
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}
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class FpsInfo {
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final double fps;
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final int totalFramesCount;
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final int droppedFramesCount;
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final int drawFramesCount;
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FpsInfo(
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this.fps,
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this.totalFramesCount,
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this.droppedFramesCount,
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this.drawFramesCount
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);
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@override
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String toString() {
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return 'FpsInfo{'
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'fps: $fps, '
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'totalFramesCount: $totalFramesCount, '
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'droppedFramesCount: $droppedFramesCount, '
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'drawFramesCount: $drawFramesCount}';
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}
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} |