support animation illust

lib/components/illust_widget.dart

@@ -99,6 +99,23 @@ class _IllustWidgetState extends State<IllustWidget> {
                           style: TextStyle(fontSize: 12),),
                       )),
                 ),
+              if(widget.illust.isUgoira)
+                Positioned(
+                  bottom: 12,
+                  left: 12,
+                  child: Container(
+                      width: 28,
+                      height: 20,
+                      decoration: BoxDecoration(
+                        color: ColorScheme.of(context).primaryContainer.withOpacity(0.8),
+                        borderRadius: BorderRadius.circular(4),
+                        border: Border.all(color: ColorScheme.of(context).outlineVariant, width: 0.6),
+                      ),
+                      child: const Center(
+                        child: Text("GIF",
+                          style: TextStyle(fontSize: 12),),
+                      )),
+                ),
               if(widget.illust.isR18)
                 Positioned(
                   bottom: 12,

lib/components/ugoira.dart

@@ -0,0 +1,265 @@
+import 'dart:convert';
+import 'dart:io';
+import 'package:archive/archive_io.dart';
+
+import 'package:crypto/crypto.dart';
+import 'package:fluent_ui/fluent_ui.dart';
+import 'package:intl/intl.dart';
+import 'package:pixes/components/md.dart';
+import 'package:pixes/network/network.dart';
+
+import '../foundation/cache_manager.dart';
+import '../network/app_dio.dart';
+import 'dart:ui' as ui;
+
+class UgoiraWidget extends StatefulWidget {
+  const UgoiraWidget({super.key, required this.id, required this.previewImage,
+    required this.width, required this.height});
+
+  final String id;
+
+  final ImageProvider previewImage;
+
+  final double width;
+
+  final double height;
+
+  @override
+  State<UgoiraWidget> createState() => _UgoiraWidgetState();
+}
+
+class _UgoiraWidgetState extends State<UgoiraWidget> {
+  _UgoiraMetadata? _metadata;
+
+  bool _loading = false;
+
+  bool _finished = false;
+
+  bool _error = false;
+
+  int expectedBytes = 1;
+
+  int receivedBytes = 0;
+
+  @override
+  Widget build(BuildContext context) {
+    return SizedBox(
+      width: widget.width,
+      height: widget.height,
+      child: !_finished
+        ? buildPreview()
+        : _UgoiraAnimation(metadata: _metadata!, key: Key(widget.id),),
+    );
+  }
+
+  Widget buildPreview() {
+    return Stack(
+      children: [
+        Positioned.fill(
+          child: ClipRRect(
+            borderRadius: BorderRadius.circular(4),
+            child: Image(
+              image: widget.previewImage,
+              fit: BoxFit.cover,
+            ),
+          ),
+        ),
+        if(_error)
+          const Positioned.fill(
+            child: Center(
+              child: Icon(
+                MdIcons.error_outline,
+                size: 36,
+              ),
+            )),
+        if(!_loading)
+          Positioned.fill(
+            child: GestureDetector(
+              onTap: load,
+              child: const Center(
+                child: Icon(
+                  MdIcons.play_circle_outline,
+                  size: 36,
+                ),
+              ),
+            ),
+          )
+        else
+          Center(
+            child: ProgressRing(value: (receivedBytes / expectedBytes) * 100,),
+          ),
+      ],
+    );
+  }
+
+  void load() async {
+    setState(() {
+      _loading = true;
+    });
+    var res0 = await Network().apiGet('/v1/ugoira/metadata?illust_id=${widget.id}');
+    if(res0.error) {
+      setState(() {
+        _error = true;
+        _loading = false;
+      });
+      return;
+    }
+    var json = res0.data;
+    _metadata = _UgoiraMetadata(
+      url: json["ugoira_metadata"]["zip_urls"]["medium"],
+      frames: (json["ugoira_metadata"]["frames"] as List).map<_UgoiraFrame>((e) => _UgoiraFrame(
+        delay: e["delay"],
+        fileName: e["file"],
+      )).toList(),
+    );
+    try {
+      var key = "ugoira_${widget.id}";
+      var cached = await CacheManager().findCache(key);
+      if(cached != null) {
+        await extract(cached);
+        return;
+      }
+      var dio = AppDio();
+      final time = DateFormat("yyyy-MM-dd'T'HH:mm:ss'+00:00'").format(DateTime.now());
+      final hash = md5.convert(utf8.encode(time + Network.hashSalt)).toString();
+      var res = await dio.get<ResponseBody>(
+          _metadata!.url,
+          options: Options(
+              responseType: ResponseType.stream,
+              validateStatus: (status) => status != null && status < 500,
+              headers: {
+                "referer": "https://app-api.pixiv.net/",
+                "user-agent": "PixivAndroidApp/5.0.234 (Android 14; Pixes)",
+                "x-client-time": time,
+                "x-client-hash": hash,
+                "accept-enconding": "gzip",
+              }
+          )
+      );
+      if(res.statusCode != 200) {
+        throw "Failed to load image: ${res.statusCode}";
+      }
+      expectedBytes = int.parse(res.headers.value("content-length") ?? "1");
+      var cachingFile = await CacheManager().openWrite(key);
+      await for (var chunk in res.data!.stream) {
+        await cachingFile.writeBytes(chunk);
+        setState(() {
+          receivedBytes += chunk.length;
+          if(receivedBytes > expectedBytes) {
+            expectedBytes = receivedBytes + 1;
+          }
+        });
+      }
+      await cachingFile.close();
+      await extract(cachingFile.file.path);
+    }
+    catch(e) {
+      setState(() {
+        _error = true;
+        _loading = false;
+      });
+      return;
+    }
+  }
+
+  Future<void> extract(String filePath) async{
+    var zip = ZipDecoder().decodeBytes(await File(filePath).readAsBytes());
+    for(var file in zip) {
+      if(file.isFile) {
+        var frame = _metadata!.frames.firstWhere((element) => element.fileName == file.name);
+        frame.data = await decodeImageFromList(file.content);
+      }
+    }
+    zip.clear();
+    setState(() {
+      _loading = false;
+      _finished = true;
+    });
+  }
+}
+
+
+class _UgoiraAnimation extends StatefulWidget {
+  const _UgoiraAnimation({super.key, required this.metadata});
+
+  final _UgoiraMetadata metadata;
+
+  @override
+  State<_UgoiraAnimation> createState() => _UgoiraAnimationState();
+}
+
+class _UgoiraAnimationState extends State<_UgoiraAnimation> with SingleTickerProviderStateMixin {
+  late AnimationController _controller;
+
+  @override
+  void initState() {
+    super.initState();
+    final totalDuration = widget.metadata.frames.fold<int>(
+        0, (previousValue, element) => previousValue + element.delay);
+    _controller = AnimationController(
+      vsync: this,
+      duration: Duration(milliseconds: totalDuration),
+      value: 0,
+      lowerBound: 0,
+      upperBound: widget.metadata.frames.length.toDouble(),
+    );
+    _controller.repeat();
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AnimatedBuilder(
+      animation: _controller,
+      builder: (context, child) {
+        final frame = widget.metadata.frames[_controller.value.toInt()];
+        return CustomPaint(
+          painter: _ImagePainter(frame.data!),
+        );
+      },
+    );
+  }
+}
+
+class _UgoiraMetadata {
+  final String url;
+  final List<_UgoiraFrame> frames;
+
+  _UgoiraMetadata({required this.url, required this.frames});
+}
+
+class _UgoiraFrame {
+  final int delay;
+  final String fileName;
+  ui.Image? data;
+
+  _UgoiraFrame({required this.delay, required this.fileName});
+}
+
+class _ImagePainter extends CustomPainter {
+  final ui.Image data;
+
+  _ImagePainter(this.data);
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    // 覆盖整个画布
+    Rect rect = Offset.zero & size;
+    canvas.drawImageRect(
+      data,
+      Rect.fromLTRB(0, 0, data.width.toDouble(), data.height.toDouble()),
+      rect,
+      Paint()..filterQuality = FilterQuality.medium
+    );
+  }
+
+  @override
+  bool shouldRepaint(covariant CustomPainter oldDelegate) {
+    return data != (oldDelegate as _ImagePainter).data;
+  }
+}

lib/network/models.dart

@@ -181,6 +181,7 @@ class Illust {
   final int totalBookmarks;
   bool isBookmarked;
   final bool isAi;
+  final bool isUgoira;
 
   bool get isR18 => tags.contains(const Tag("R-18", null));
 
@@ -226,7 +227,8 @@ class Illust {
         totalView = json['total_view'],
         totalBookmarks = json['total_bookmarks'],
         isBookmarked = json['is_bookmarked'],
-        isAi = json['illust_ai_type'] == 2;
+        isAi = json['illust_ai_type'] == 2,
+        isUgoira = json['type'] == "ugoira";
 }
 
 class TrendingTag {

lib/pages/illust_page.dart

@@ -19,6 +19,7 @@ import 'package:pixes/utils/translation.dart';
 import 'package:share_plus/share_plus.dart';
 
 import '../components/md.dart';
+import '../components/ugoira.dart';
 
 
 const _kBottomBarHeight = 64.0;
@@ -100,7 +101,10 @@ class _IllustPageState extends State<IllustPage> {
       imageWidth = imageWidth / scale;
       imageHeight = height;
     }
-    var image = SizedBox(
+    Widget image;
+
+    if(!widget.illust.isUgoira) {
+      image = SizedBox(
         width: imageWidth,
         height: imageHeight,
         child: GestureDetector(
@@ -138,6 +142,14 @@ class _IllustPageState extends State<IllustPage> {
           ),
         ),
       );
+    } else {
+      image = UgoiraWidget(
+        id: widget.illust.id.toString(),
+        previewImage: CachedImageProvider(widget.illust.images[index].large),
+        width: imageWidth,
+        height: imageHeight,
+      );
+    }
 
     return Center(
       child: image,

pubspec.lock

@@ -9,6 +9,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.0.1"
+  archive:
+    dependency: "direct main"
+    description:
+      name: archive
+      sha256: ecf4273855368121b1caed0d10d4513c7241dfc813f7d3c8933b36622ae9b265
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.5.1"
   async:
     dependency: transitive
     description:

pubspec.yaml

@@ -54,6 +54,7 @@ dependencies:
   share_plus: ^9.0.0
   file_selector: ^1.0.1
   flutter_file_dialog: 3.0.1
+  archive: ^3.5.1
 dev_dependencies:
   flutter_test:
     sdk: flutter