fix(player): 优化上下滑切集黑屏

test/player/player_video_surface_test.dart

@@ -13,16 +13,48 @@ void main() {
     await _pumpSurface(tester);
 
     expect(_fallbackColor(tester), Colors.black);
-    expect(find.byKey(const Key('player-fallback-cover')), findsNothing);
-    expect(find.byKey(const Key('player-fallback-scrim')), findsNothing);
+    expect(find.byKey(const Key('player-opening-frame')), findsNothing);
     expect(_opacity(tester), 0);
-    expect(find.byKey(const Key('player-debug-video')), findsNothing);
+  });
+
+  testWidgets('should_show_opening_frame_before_decode_is_ready', (
+    tester,
+  ) async {
+    await _pumpSurface(
+      tester,
+      openingFrame: const ColoredBox(
+        key: Key('fake-opening'),
+        color: Colors.red,
+      ),
+    );
+
+    expect(find.byKey(const Key('player-opening-frame')), findsOneWidget);
+    expect(find.byKey(const Key('fake-opening')), findsOneWidget);
+    expect(_opacity(tester), 0);
+  });
+
+  testWidgets('should_reveal_paused_frame_when_initialized', (tester) async {
+    final controller = await _pumpSurface(tester);
+    controller.value = const VideoPlayerValue(
+      duration: Duration(minutes: 1),
+      size: Size(1280, 720),
+      position: Duration.zero,
+      isInitialized: true,
+      isPlaying: false,
+    );
+    await tester.pump();
+
+    expect(_opacity(tester), 1);
+    expect(find.byKey(const Key('player-opening-frame')), findsNothing);
   });
 
   testWidgets('should_fade_video_in_within_200ms_after_first_frame', (
     tester,
   ) async {
-    final controller = await _pumpSurface(tester);
+    final controller = await _pumpSurface(
+      tester,
+      openingFrame: const ColoredBox(color: Colors.red),
+    );
     expect(_opacity(tester), 0);
 
     controller.value = const VideoPlayerValue(
@@ -35,6 +67,7 @@ void main() {
     await tester.pump();
 
     expect(_opacity(tester), 1);
+    expect(find.byKey(const Key('player-opening-frame')), findsNothing);
     expect(
       tester
           .widget<AnimatedOpacity>(
@@ -49,9 +82,6 @@ void main() {
     expect(halfway, lessThan(1));
     await tester.pump(const Duration(milliseconds: 100));
     expect(_fadeValue(tester), 1);
-    expect(_fallbackColor(tester), Colors.black);
-    expect(find.byKey(const Key('player-fallback-cover')), findsNothing);
-    expect(find.byKey(const Key('player-debug-video')), findsNothing);
   });
 
   testWidgets('should_show_video_error_above_retained_fallback', (
@@ -65,9 +95,7 @@ void main() {
     expect(find.byKey(const Key('player-video-error')), findsOneWidget);
     expect(find.text('No route to host'), findsOneWidget);
     expect(_fallbackColor(tester), Colors.black);
-    expect(find.byKey(const Key('player-fallback-cover')), findsNothing);
     expect(_opacity(tester), 0);
-    expect(find.byKey(const Key('player-debug-video')), findsNothing);
   });
 
   testWidgets('should_cover_new_video_only_while_handoff_is_held', (
@@ -119,6 +147,7 @@ void main() {
 Future<VideoPlayerController> _pumpSurface(
   WidgetTester tester, {
   VideoPlayerValue? value,
+  Widget? openingFrame,
 }) async {
   final controller = VideoPlayerController.networkUrl(
     Uri.parse('http://192.168.31.187:8081/files/video.mp4'),
@@ -132,6 +161,7 @@ Future<VideoPlayerController> _pumpSurface(
           controller: controller,
           videoUrl: controller.dataSource,
           theater: false,
+          openingFrame: openingFrame,
         ),
       ),
     ),