fix(player): 观看全集复用抓帧首屏

lib/pages/player/player_frame_capture.dart

@@ -0,0 +1,63 @@
+// Author: fruit.com.cn
+
+import 'dart:ui' as ui;
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
+
+class PlayerFrameCapture {
+  const PlayerFrameCapture._();
+
+  static const int budgetMilliseconds = 32;
+
+  static Future<Uint8List?> capture({
+    required BuildContext context,
+    required GlobalKey boundaryKey,
+    required String source,
+  }) async {
+    final boundary = boundaryKey.currentContext?.findRenderObject();
+    if (boundary is! RenderRepaintBoundary) {
+      _log('[player-entry] phase=frame-capture-unavailable source=$source');
+      return null;
+    }
+    final stopwatch = Stopwatch()..start();
+    try {
+      final pixelRatio = MediaQuery.devicePixelRatioOf(
+        context,
+      ).clamp(1.0, 2.0).toDouble();
+      final image = await boundary.toImage(pixelRatio: pixelRatio);
+      final data = await image.toByteData(format: ui.ImageByteFormat.png);
+      image.dispose();
+      if (stopwatch.elapsedMilliseconds > budgetMilliseconds) {
+        _log(
+          '[player-entry] phase=frame-capture-over-budget source=$source '
+          'ms=${stopwatch.elapsedMilliseconds} budget_ms=$budgetMilliseconds',
+        );
+      }
+      if (data == null) {
+        _log('[player-entry] phase=frame-capture-empty source=$source');
+        return null;
+      }
+      final bytes = data.buffer.asUint8List(
+        data.offsetInBytes,
+        data.lengthInBytes,
+      );
+      _log(
+        '[player-entry] phase=frame-captured source=$source '
+        'bytes=${bytes.length} ms=${stopwatch.elapsedMilliseconds}',
+      );
+      return bytes;
+    } catch (error) {
+      _log(
+        '[player-entry] phase=frame-capture-failed source=$source '
+        'error=$error',
+      );
+      return null;
+    }
+  }
+
+  static void _log(String message) {
+    if (kDebugMode) debugPrint(message);
+  }
+}