mirror of
https://github.com/kuhyx/diet-guard.git
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Krzysztof kuhy Rudnicki
c12faa3920
Completes the move: `linux/` is gone, replaced by the web build served by the
wrapper in a Chrome `--app` window. The icons and the .desktop installer move
out of `linux/` first -- they are not Flutter scaffolding and are still
needed; the entry now points at the packaged launcher and matches the
`--class=diet_guard_app` the wrapper passes, so the taskbar shows the app's
icon rather than a browser's.
install_arch.sh carries over the three traps each of which produced an
install that looked fine until launched: `dart build cli` rather than
`dart compile exe` (which refuses any package whose dependency graph has
native build hooks), `options=('!strip')` (makepkg would otherwise discard
the AOT snapshot, leaving a binary that runs as the bare Dart VM printing a
usage message), and no browser in `depends` (this machine's policy uninstalls
`chromium` seconds later, failing dependency resolution).
Also adds the frame-cadence instrument the performance claim is measured
with, armed by `--dart-define=DIET_GUARD_FRAME_STATS=1` and read with
`String.fromEnvironment` -- `bool.fromEnvironment` only accepts the literal
`true`, so `=1` would evaluate to false and a whole run would silently
produce no data. It reports frame-to-frame cadence rather than build/raster
durations, since work that fits the budget says nothing about the frame rate
actually achieved.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
76 lines
2.5 KiB
Dart
76 lines
2.5 KiB
Dart
/// Optional frame-cadence instrument, armed with
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/// `--dart-define=DIET_GUARD_FRAME_STATS=1`.
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///
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/// Reports **frame-to-frame cadence**, not build/raster durations: work that
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/// fits the budget says nothing about the frame rate actually achieved, which
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/// is the number the desktop migration exists to move.
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///
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/// Read with `String.fromEnvironment`, never `bool.fromEnvironment` -- the
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/// latter only accepts the literal `true`, so `=1` would silently evaluate to
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/// false and a whole measurement run would produce no data while looking like
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/// a broken callback.
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library;
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import 'dart:async';
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import 'dart:convert';
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import 'dart:ui' show FramePhase;
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import 'package:diet_guard_app/services/desktop_wrapper.dart';
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import 'package:flutter/scheduler.dart';
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import 'package:http/http.dart' as http;
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/// Whether the instrument is armed for this build.
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const frameStatsEnabled =
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String.fromEnvironment('DIET_GUARD_FRAME_STATS') == '1';
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/// Starts collecting frame-to-frame intervals and periodically posts a
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/// summary to the desktop wrapper, which writes it to disk.
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///
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/// The wrapper is used as the sink because a browser cannot write a file and
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/// reading its console from outside needs a debugger attached; a POST lands
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/// somewhere a measurement run can simply read.
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// coverage:ignore-start
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void startFrameStats({Duration reportEvery = const Duration(seconds: 2)}) {
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final intervalsMs = <double>[];
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int? previousMicros;
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SchedulerBinding.instance.addTimingsCallback((timings) {
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for (final timing in timings) {
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final micros = timing.timestampInMicroseconds(FramePhase.rasterFinish);
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if (previousMicros != null) {
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intervalsMs.add((micros - previousMicros!) / 1000);
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}
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previousMicros = micros;
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}
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});
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Timer.periodic(reportEvery, (_) {
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if (intervalsMs.isEmpty) return;
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final sample = [...intervalsMs]..sort();
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intervalsMs.clear();
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double percentile(double fraction) =>
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sample[(sample.length * fraction).floor().clamp(
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0,
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sample.length - 1,
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)];
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unawaited(
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http.post(
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Uri.parse(
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'$desktopWrapperOrigin${WrapperPaths.documents}'
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'frame_stats.json',
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),
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body: jsonEncode({
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'frames': sample.length,
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'p50_ms': percentile(0.50),
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'p95_ms': percentile(0.95),
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'max_ms': sample.last,
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'fps_at_p50': 1000 / percentile(0.50),
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'fps_at_p95': 1000 / percentile(0.95),
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}),
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),
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);
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});
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}
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// coverage:ignore-end
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