[Bug report] Android平台 PNG 图片压缩，图片反而变大

[chiclaim]

Version

2.4.0

Platforms

Android

Device Model

VIVO X80

flutter info

flutter doctor -v                                          
[✓] Flutter (Channel stable, 3.27.4, on macOS 15.2 24C101 darwin-arm64, locale zh-Hans-CN)
    • Flutter version 3.27.4 on channel stable at /Users/yzq/dev/sdk/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision d8a9f9a52e (1 year, 2 months ago), 2025-01-31 16:07:18 -0500
    • Engine revision 82bd5b7209
    • Dart version 3.6.2
    • DevTools version 2.40.3
    • Pub download mirror https://pub-web.flutter-io.cn/
    • Flutter download mirror https://storage.flutter-io.cn

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
    • Android SDK at /Users/yzq/Library/Android/sdk
    • Platform android-35, build-tools 35.0.0
    • ANDROID_HOME = /Users/yzq/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.10+0-17.0.10b1087.21-11572160)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.2)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16C5032a
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2023.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.10+0-17.0.10b1087.21-11572160)

[✓] IntelliJ IDEA Ultimate Edition (version 2023.1.7)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart

[✓] VS Code (version 1.107.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.130.0

[✓] Connected device (5 available)
    • V2183A (mobile)                 • 10AC6C01GJ001LD                      • android-arm64  • Android 15 (API 35)
    • iPhone 16 Plus (mobile)         • DEB22F23-39D2-4394-B38A-413D54865FA3 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-18-2 (simulator)
    • macOS (desktop)                 • macos                                • darwin-arm64   • macOS 15.2 24C101 darwin-arm64
    • Mac Designed for iPad (desktop) • mac-designed-for-ipad                • darwin         • macOS 15.2 24C101 darwin-arm64
    • Chrome (web)                    • chrome                               • web-javascript • Google Chrome 146.0.7680.80

[✓] Network resources
    • All expected network resources are available.

How to reproduce?

PNG 压缩前是 0.16995M
PNG压缩后是 1.231278M

PNG 图片不支持压缩，能否判断下，原图上传呢，至少不能让其变大了，感谢！

Logs

Example code (optional)

static Future<String> compressImage(String imagePath,
      {int minWidth = 1080}) async {
    final index = imagePath.lastIndexOf(".");
    final ext = imagePath.substring(index, imagePath.length).toLowerCase();
    final prefix = imagePath.substring(0, index);
    final targetPath = "${prefix}_compressed$ext";
    // 一定要判断 format，FlutterImageCompress.compressAndGetFile 默认是 CompressFormat.jpeg，如果上传的是 png 图片，就会报错
    CompressFormat format;
    if (ext == ".jpg" || ext == ".jpeg") {
      format = CompressFormat.jpeg;
    } else if (ext == ".png") {
      format = CompressFormat.png;
    } else if (ext == ".heic") {
      format = CompressFormat.heic;
    } else if (ext == ".webp") {
      format = CompressFormat.webp;
    } else {
      format = CompressFormat.jpeg;
    }
    var result = await FlutterImageCompress.compressAndGetFile(
      imagePath,
      targetPath,
      minWidth: minWidth,
      quality: 90,
      format: format,
    );
    if (isDebug) {
      printDebug("--------压缩前：${await File(imagePath).length() / 1024 / 1024}");
      printDebug("--------压缩后：${await result!.length() / 1024 / 1024}");
    }
    return targetPath;
  }
}


输出：
I/flutter (24898): --------压缩前：0.16995906829833984
I/flutter (24898): --------压缩后：1.231278419494629

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