105 lines
2.2 KiB
Dart
105 lines
2.2 KiB
Dart
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import 'package:flutter/foundation.dart';
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import 'package:flutter/scheduler.dart';
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import '../../../shared/utils/app_logger.dart';
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const _tag = 'FrameJank';
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@immutable
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class FrameDiag {
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final double fps;
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final double lastBuildMs;
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final double lastRasterMs;
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final int jankCount;
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const FrameDiag({
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required this.fps,
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required this.lastBuildMs,
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required this.lastRasterMs,
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required this.jankCount,
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});
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static const zero = FrameDiag(
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fps: 0,
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lastBuildMs: 0,
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lastRasterMs: 0,
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jankCount: 0,
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);
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}
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class FrameJankMonitor {
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FrameJankMonitor({this.jankThreshold = const Duration(milliseconds: 32)});
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final Duration jankThreshold;
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final ValueNotifier<FrameDiag> diag = ValueNotifier<FrameDiag>(
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FrameDiag.zero,
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);
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TimingsCallback? _callback;
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int _jankCount = 0;
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int _windowFrames = 0;
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final Stopwatch _windowClock = Stopwatch()..start();
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double _fps = 0;
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void start() {
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if (kReleaseMode || _callback != null) return;
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final cb = _onTimings;
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_callback = cb;
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SchedulerBinding.instance.addTimingsCallback(cb);
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}
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void _onTimings(List<FrameTiming> timings) {
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if (timings.isEmpty) return;
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for (final t in timings) {
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if (t.buildDuration >= jankThreshold ||
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t.rasterDuration >= jankThreshold) {
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_jankCount++;
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AppLogger.warn(
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_tag,
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'janky frame build=${_ms(t.buildDuration)} '
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'raster=${_ms(t.rasterDuration)} total=${_ms(t.totalSpan)}',
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);
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}
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}
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_windowFrames += timings.length;
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final elapsedMs = _windowClock.elapsedMilliseconds;
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if (elapsedMs >= 500) {
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_fps = _windowFrames * 1000 / elapsedMs;
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_windowFrames = 0;
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_windowClock.reset();
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}
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final last = timings.last;
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diag.value = FrameDiag(
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fps: _fps,
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lastBuildMs: last.buildDuration.inMicroseconds / 1000,
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lastRasterMs: last.rasterDuration.inMicroseconds / 1000,
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jankCount: _jankCount,
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);
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}
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void dispose() {
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final cb = _callback;
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if (cb != null) {
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SchedulerBinding.instance.removeTimingsCallback(cb);
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_callback = null;
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}
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diag.dispose();
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}
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static String _ms(Duration d) =>
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'${(d.inMicroseconds / 1000).toStringAsFixed(1)}ms';
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}
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