由于您没有提供任何代码，我假设您希望拥有基于当前子对象小部件。
如果是，您可以尝试IntrinsicWidth和IntrinsicHeight小部件。https://api.flutter.dev/flutter/widgets/IntrinsicWidth-class.html
IntrinsicWidgth：
创建一个小部件，该小部件将其子级的大小调整为该子级的固有宽度。
此类非常有用，例如，当无限制宽度可用，而您希望将原本会尝试无限扩展的子级改为将其自身调整为更合理的宽度时。
使用此小部件，将根据固有大小使用呈现子对象。

你可以使用CustomPainter和drawAtlas，performant，显示图像的一部分。

我找到了这个解决方案：

import 'dart:typed_data';
import 'dart:ui' as ui;

import 'package:flutter/material.dart';

class MyWidget extends StatelessWidget {
  final ui.Image _uiImage;
  final Path _clipPath;

  const MyWidget({
    Key? key,
    required ui.Image uiImage,
    required Path clipPath,
  })  : _uiImage = uiImage,
        _clipPath = clipPath,
        super(key: key);

  @override
  Widget build(BuildContext context) {
    final bounds = _clipPath.getBounds();
    
    final translateM = Float64List.fromList([
      1, 0, 0, 0,
      0, 1, 0, 0,
      0, 0, 1, 0,
      -bounds.left, -bounds.top, 0, 1
    ]);
    
    final localClipPath = _clipPath.transform(translateM);
    
    return ClipPath(
      clipper: _MyClipper(localClipPath),
      child: CustomPaint(
        painter: _MyPainter(_uiImage, bounds),
        child: SizedBox(
          width: bounds.width,
          height: bounds.height,
        ),
      ),
    );
  }
}

class _MyClipper extends CustomClipper<Path> {
  final Path _clipPath;

  _MyClipper(this._clipPath);

  @override
  Path getClip(Size size) => _clipPath;

  @override
  bool shouldReclip(covariant CustomClipper<Path> oldClipper) => true;
}

class _MyPainter extends CustomPainter {
  final ui.Image _uiImage;
  final Rect _bounds;

  final _paint = Paint();

  _MyPainter(this._uiImage, this._bounds);

  @override
  void paint(Canvas canvas, Size size) {
    canvas.drawAtlas(
      _uiImage,
      [
        RSTransform.fromComponents(
          rotation: 0.0,
          scale: 1.0,
          // Center of the sprite relative to its rect
          anchorX: _bounds.width / 2,
          anchorY: _bounds.height / 2,
          // Location at which to draw the center of the sprite
          translateX: _bounds.width / 2,
          translateY: _bounds.height / 2,
        )
      ],
      [_bounds],
      null,
      null,
      null,
      _paint,
    );
  }

  @override
  bool shouldRepaint(_MyPainter oldDelegate) => false;
}