compress function

ImageFile compress(ImageFileConfiguration param)

Compress image file input synchronously

On Flutter, you can run this compression on background using isolates with

ImageFileConfiguration param;
var compressedImage = await compute(compress, param);

Implementation

ImageFile compress(ImageFileConfiguration param) {
  final input = param.input;
  if (input.contentType == 'image/webp') return input;

  final config = param.config;
  final image = img.decodeImage(input.rawBytes);

  if (image != null) {
    List<int>? output;
    switch (config.outputType) {
      case OutputType.jpg:
        output = img.encodeJpg(image, quality: config.jpgQuality);
        break;
      case OutputType.png:
        output = img.encodePng(image, level: config.pngCompression.level);
        break;
    }

    return ImageFile(
      filePath: '',
      rawBytes: Uint8List.fromList(output),
      width: image.width,
      height: image.height,
    );
  } else {
    final animation = img.decodeGif(input.rawBytes);
    if (animation != null) {
      final output = img.encodeGif(
        animation,
        samplingFactor: config.animationGifSamplingFactor,
      );

      return ImageFile(
        filePath: '',
        rawBytes: Uint8List.fromList(output),
        width: animation.width,
        height: animation.height,
      );
    }
  }

  return input;
}