1  import 'dart:io';
 2  import 'dart:ui' as ui;
 3  
 4  import 'package:path_provider/path_provider.dart';
 5  
 6  /// Resize an image file to fit within [maxWidth] x [maxHeight],
 7  /// maintaining aspect ratio. Saves as PNG to a temporary file.
 8  /// Used on macOS where ImagePicker's maxWidth/maxHeight are unavailable.
 9  Future<String> resizeImageToFile(
10    String sourcePath, {
11    required int maxWidth,
12    required int maxHeight,
13  }) async {
14    final bytes = await File(sourcePath).readAsBytes();
15    final codec = await ui.instantiateImageCodec(
16      bytes,
17      targetWidth: maxWidth,
18      targetHeight: maxHeight,
19    );
20    final frame = await codec.getNextFrame();
21    final byteData = await frame.image.toByteData(
22      format: ui.ImageByteFormat.png,
23    );
24    frame.image.dispose();
25  
26    final dir = await getTemporaryDirectory();
27    final timestamp = DateTime.now().millisecondsSinceEpoch;
28    final resizedPath = '${dir.path}/resized_$timestamp.png';
29    await File(resizedPath).writeAsBytes(
30      byteData!.buffer.asUint8List(),
31    );
32    return resizedPath;
33  }