init

lib/theme/accent_extract.dart

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+import 'package:flutter/material.dart';
+import 'package:palette_generator/palette_generator.dart';
+
+/// Extract a lively accent color from album art, mirroring Ratune's
+/// art-driven `dynamic` theme (`color.rs`): pick the most vibrant swatch, then
+/// nudge it into a readable lightness/saturation band. Ratune does the boost in
+/// OKLab; this HSL approximation is close enough for now (OKLab is a later
+/// refinement noted in the roadmap).
+Future<Color?> extractAccent(ImageProvider image) async {
+  final palette = await PaletteGenerator.fromImageProvider(
+    image,
+    size: const Size(200, 200),
+    maximumColorCount: 8,
+  );
+
+  final picked = palette.vibrantColor?.color ??
+      palette.lightVibrantColor?.color ??
+      palette.dominantColor?.color;
+  if (picked == null) return null;
+  return _ensureReadable(picked);
+}
+
+Color _ensureReadable(Color c) {
+  final hsl = HSLColor.fromColor(c);
+  // Keep it bright enough to read on near-black, saturated enough to feel alive.
+  final lightness = hsl.lightness.clamp(0.45, 0.70);
+  final saturation = hsl.saturation < 0.40 ? 0.55 : hsl.saturation;
+  return hsl.withLightness(lightness).withSaturation(saturation).toColor();
+}