feat: Add support for WebP image format in clipboard and thumbnail handling

lib/components/thumbnail.dart

@@ -12,6 +12,7 @@ import '../api/file.dart';
 import '../api/gallery.dart';
 import '../globals.dart';
 import '../utils.dart';
+import '../utils/clipboard.dart';
 import '../viewer/single.dart';
 import 'image.dart';
 
@@ -84,6 +85,7 @@ class _Thumbnail extends State<Thumbnail> {
   double? _iconSize;
   bool _disposed = false;
   String? _originalUrl;
+  ImageFmt _fmt = ImageFmt.jpg;
   void _onNsfwChanged(dynamic args) {
     final arguments = args as (String, bool)?;
     if (arguments == null) return;
@@ -146,6 +148,9 @@ class _Thumbnail extends State<Thumbnail> {
           if (cache != null) {
             setState(() {
               _data = cache!.$1;
+              var headers = Headers.fromMap(cache!.$2);
+              _fmt = ImageFmt.fromMimeType(headers.value("content-type")) ??
+                  ImageFmt.jpg;
               _uri = cache!.$3 ?? _originalUrl;
               _isLoading = false;
               _cancel = null;
@@ -168,6 +173,8 @@ class _Thumbnail extends State<Thumbnail> {
             'Failed to get thumbnail: ${re.response.statusCode} ${re.response.statusMessage}');
       }
       _uri = re.response.realUri.toString();
+      _fmt = ImageFmt.fromMimeType(re.response.headers.value("content-type")) ??
+          ImageFmt.jpg;
       final data = Uint8List.fromList(re.data);
       if (!_cancel!.isCancelled) {
         if (isImageCacheEnabled) {
@@ -273,6 +280,7 @@ class _Thumbnail extends State<Thumbnail> {
             uri: _uri,
             originalUri: oUri,
             fileName: _fileName,
+            fmt: _fmt,
             dir: _dir,
             isNsfw:
                 auth.canEditGallery == true ? () => widget._pMeta.isNsfw : null,

lib/platform/to_png.dart

@@ -5,3 +5,7 @@ import 'package:image/image.dart';
 Future<Uint8List> jpgToPng(Uint8List data) async {
   return encodePng(decodeJpg(data)!);
 }
+
+Future<Uint8List> webpToPng(Uint8List data) async {
+  return encodePng(decodeWebP(data)!);
+}

lib/platform/to_png_none.dart

@@ -3,3 +3,7 @@ import 'dart:typed_data';
 Future<Uint8List> jpgToPng(Uint8List data) async {
   throw UnimplementedError();
 }
+
+Future<Uint8List> webpToPng(Uint8List data) async {
+  throw UnimplementedError();
+}

lib/utils/clipboard.dart

@@ -8,7 +8,8 @@ import '../utils.dart';
 enum ImageFmt {
   jpg,
   png,
-  gif;
+  gif,
+  webp;
 
   String toMimeType() {
     switch (this) {
@@ -18,6 +19,8 @@ enum ImageFmt {
         return "image/png";
       case ImageFmt.gif:
         return "image/gif";
+      case ImageFmt.webp:
+        return "image/webp";
     }
   }
 
@@ -26,6 +29,8 @@ enum ImageFmt {
     switch (mime) {
       case "image/jpeg":
         return ImageFmt.jpg;
+      case "image/webp":
+        return ImageFmt.webp;
       case "image/png":
         return ImageFmt.png;
       case "image/gif":
@@ -46,11 +51,17 @@ Future<void> copyImageToClipboard(Uint8List data, ImageFmt fmt) async {
         ? Formats.jpeg(data)
         : fmt == ImageFmt.gif
             ? Formats.gif(data)
-            : Formats.png(data));
+            : fmt == ImageFmt.png
+                ? Formats.png(data)
+                : Formats.webp(data));
   } else {
     item.add(fmt == ImageFmt.gif
         ? Formats.gif(data)
-        : Formats.png(fmt == ImageFmt.jpg ? await jpgToPng(data) : data));
+        : Formats.png(fmt == ImageFmt.jpg
+            ? await jpgToPng(data)
+            : fmt == ImageFmt.webp
+                ? await webpToPng(data)
+                : data));
   }
   await SystemClipboard.instance!.write([item]);
 }