fix(player): 预解码观看全集首帧

lib/pages/player/player_frame_capture.dart

@@ -6,11 +6,56 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 
+import '../../core/config/app_config.dart';
+
+class PreparedPlayerFrame {
+  const PreparedPlayerFrame({this.bytes, this.provider});
+
+  final Uint8List? bytes;
+  final ImageProvider<Object>? provider;
+
+  bool get isReady => bytes != null || provider != null;
+}
+
 class PlayerFrameCapture {
   const PlayerFrameCapture._();
 
   static const int budgetMilliseconds = 32;
 
+  static Future<PreparedPlayerFrame> captureAndPrecache({
+    required BuildContext context,
+    required GlobalKey boundaryKey,
+    required String source,
+    String? fallbackPosterUrl,
+  }) async {
+    final bytes = await capture(
+      context: context,
+      boundaryKey: boundaryKey,
+      source: source,
+    );
+    if (bytes != null) {
+      if (!context.mounted) return const PreparedPlayerFrame();
+      final provider = MemoryImage(bytes);
+      if (await _precache(context, provider, source: source, kind: 'capture')) {
+        _log(
+          '[player-entry] phase=frame-precached source=$source kind=capture',
+        );
+        return PreparedPlayerFrame(bytes: bytes, provider: provider);
+      }
+    }
+
+    final poster = fallbackPosterUrl?.trim() ?? '';
+    if (poster.isNotEmpty) {
+      if (!context.mounted) return const PreparedPlayerFrame();
+      final provider = NetworkImage(AppConfig.mediaUrl(poster));
+      if (await _precache(context, provider, source: source, kind: 'poster')) {
+        _log('[player-entry] phase=frame-precached source=$source kind=poster');
+        return PreparedPlayerFrame(provider: provider);
+      }
+    }
+    return const PreparedPlayerFrame();
+  }
+
   static Future<Uint8List?> capture({
     required BuildContext context,
     required GlobalKey boundaryKey,
@@ -57,6 +102,32 @@ class PlayerFrameCapture {
     }
   }
 
+  static Future<bool> _precache(
+    BuildContext context,
+    ImageProvider<Object> provider, {
+    required String source,
+    required String kind,
+  }) async {
+    var failed = false;
+    try {
+      await precacheImage(
+        provider,
+        context,
+        onError: (_, _) {
+          failed = true;
+        },
+      );
+    } catch (_) {
+      failed = true;
+    }
+    if (failed) {
+      _log(
+        '[player-entry] phase=frame-precache-failed source=$source kind=$kind',
+      );
+    }
+    return !failed;
+  }
+
   static void _log(String message) {
     if (kDebugMode) debugPrint(message);
   }

lib/pages/player/player_logic.dart

@@ -230,7 +230,6 @@ class PlayerLogic extends ChangeNotifier {
     cancelScrub();
     await session.pauseForRouteHandoff();
     _logFeedHandoff('paused');
-    await saveCurrentProgress();
   }
 
   /// 独立播放页关闭并恢复首页路由后，等原生播放器实际恢复再结束交接。
@@ -1230,27 +1229,38 @@ class PlayerLogic extends ChangeNotifier {
     Drama drama,
     int index,
   ) async {
-    final initialFrameBytes = await PlayerFrameCapture.capture(
+    final fallbackPosterUrl = index >= 0 && index < drama.episodes.length
+        ? drama.episodes[index].posterUrl
+        : null;
+    final preparedFrame = await PlayerFrameCapture.captureAndPrecache(
       context: context,
       boundaryKey: renderBoundaryKey,
       source: 'watch-all',
+      fallbackPosterUrl: fallbackPosterUrl,
     );
     if (!context.mounted) return;
     await pauseForFullPlayer();
     if (!context.mounted) return;
-    await Navigator.of(context).push(
+    final route = Navigator.of(context).push(
       FadePageRoute<void>(
-        transitionDuration: const Duration(milliseconds: 180),
+        transitionDuration: Duration.zero,
+        reverseTransitionDuration: Duration.zero,
         builder: (_) => PlayerPage(
           drama: drama,
           initialIndex: index,
           wallet: wallet,
           downloads: downloads,
-          revealAfterFirstFrame: initialFrameBytes != null,
-          initialFrameBytes: initialFrameBytes,
+          revealAfterFirstFrame: preparedFrame.isReady,
+          initialFrameBytes: preparedFrame.bytes,
+          initialFrameProvider: preparedFrame.provider,
         ),
       ),
     );
+    if (kDebugMode) {
+      debugPrint('[player-entry] phase=route-pushed source=watch-all ms=0');
+    }
+    unawaited(saveCurrentProgress());
+    await route;
     if (!isMounted()) return;
     await resumeAfterFullPlayer();
   }

lib/pages/player/player_view.dart

@@ -93,6 +93,7 @@ class PlayerPage extends StatefulWidget {
     this.handoff,
     this.revealAfterFirstFrame = false,
     this.initialFrameBytes,
+    this.initialFrameProvider,
   });
 
   final Drama drama;
@@ -122,6 +123,7 @@ class PlayerPage extends StatefulWidget {
   final PlayerPageHandoff? handoff;
   final bool revealAfterFirstFrame;
   final Uint8List? initialFrameBytes;
+  final ImageProvider<Object>? initialFrameProvider;
 
   @override
   State<PlayerPage> createState() => _PlayerPageState();
@@ -147,6 +149,7 @@ class _PlayerPageState extends State<PlayerPage>
   late bool _firstFrameReady;
   bool _leavingHandoff = false;
   bool _preparingFullPlayer = false;
+  bool _loggedInitialFrameBuild = false;
   final Set<String> _precachedPosterUrls = {};
 
   /// 收藏切换后的本地增量：基准是详情快照，切换成功按服务端状态 ±1。
@@ -157,14 +160,6 @@ class _PlayerPageState extends State<PlayerPage>
   void initState() {
     super.initState();
     _firstFrameReady = !widget.revealAfterFirstFrame;
-    if (kDebugMode &&
-        widget.revealAfterFirstFrame &&
-        widget.initialFrameBytes != null) {
-      debugPrint(
-        '[player-entry] phase=initial-frame-shown '
-        'bytes=${widget.initialFrameBytes!.length}',
-      );
-    }
     final handoff = widget.handoff;
     logic = PlayerBinding().create(
       history: context.read<WatchHistoryRepository>(),
@@ -690,6 +685,18 @@ class _PlayerPageState extends State<PlayerPage>
         logic.ticketError != null ||
         logic.blockedEpisodeId != null ||
         logic.session.error != null;
+    final hasInitialFrame =
+        widget.initialFrameBytes != null || widget.initialFrameProvider != null;
+    if (kDebugMode &&
+        widget.revealAfterFirstFrame &&
+        hasInitialFrame &&
+        !_loggedInitialFrameBuild) {
+      _loggedInitialFrameBuild = true;
+      debugPrint(
+        '[player-entry] phase=first-build-with-initial-frame '
+        'kind=${widget.initialFrameBytes != null ? 'capture' : 'poster'}',
+      );
+    }
     final presentedPlayer = widget.revealAfterFirstFrame
         ? Stack(
             fit: StackFit.expand,
@@ -698,7 +705,15 @@ class _PlayerPageState extends State<PlayerPage>
                 child: revealContent
                     ? const SizedBox.expand()
                     : widget.initialFrameBytes == null
-                    ? _buildInitialFrameFallback()
+                    ? widget.initialFrameProvider == null
+                          ? _buildInitialFrameFallback()
+                          : Image(
+                              image: widget.initialFrameProvider!,
+                              fit: BoxFit.cover,
+                              gaplessPlayback: true,
+                              errorBuilder: (_, _, _) =>
+                                  _buildInitialFrameFallback(),
+                            )
                     : Image.memory(
                         widget.initialFrameBytes!,
                         key: const Key('player-entry-frame'),
@@ -726,7 +741,7 @@ class _PlayerPageState extends State<PlayerPage>
     setState(() => _firstFrameReady = true);
     if (kDebugMode) {
       debugPrint(
-        '[player-entry] phase=ready '
+        '[player-entry] phase=video-first-frame '
         'session=${identityHashCode(logic.session)}',
       );
     }
@@ -1245,10 +1260,15 @@ class _PlayerPageState extends State<PlayerPage>
       seriesEpisodes.insert(0, sourceEpisode);
       episodeIndex = 0;
     }
-    final initialFrameBytes = await PlayerFrameCapture.capture(
+    final fallbackPosterUrl =
+        episodeIndex >= 0 && episodeIndex < seriesEpisodes.length
+        ? seriesEpisodes[episodeIndex].posterUrl
+        : sourceEpisode.posterUrl;
+    final preparedFrame = await PlayerFrameCapture.captureAndPrecache(
       context: context,
       boundaryKey: logic.renderBoundaryKey,
       source: 'full-player',
+      fallbackPosterUrl: fallbackPosterUrl,
     );
     if (!mounted || !context.mounted) return;
     final sourceUserWantsPlay = logic.session.userWantsPlay;
@@ -1265,21 +1285,24 @@ class _PlayerPageState extends State<PlayerPage>
       PageRouteBuilder<void>(
         opaque: true,
         barrierDismissible: false,
-        transitionDuration: const Duration(milliseconds: 180),
-        reverseTransitionDuration: const Duration(milliseconds: 180),
-        transitionsBuilder: (_, animation, _, child) =>
-            FadeTransition(opacity: animation, child: child),
+        transitionDuration: Duration.zero,
+        reverseTransitionDuration: Duration.zero,
         pageBuilder: (_, _, _) => PlayerPage(
           drama: seriesDrama,
           initialIndex: episodeIndex,
           handoff: handoff,
           wallet: logic.wallet,
           downloads: logic.downloads,
-          revealAfterFirstFrame: initialFrameBytes != null,
-          initialFrameBytes: initialFrameBytes,
+          revealAfterFirstFrame: preparedFrame.isReady,
+          initialFrameBytes: preparedFrame.bytes,
+          initialFrameProvider: preparedFrame.provider,
         ),
       ),
     );
+    if (kDebugMode) {
+      debugPrint('[player-entry] phase=route-pushed source=full-player ms=0');
+    }
+    unawaited(logic.saveCurrentProgress());
     await route;
     if (!mounted) return;
     logic.attach(widget, isMounted: () => mounted);