Batch processing

Run several image operations in one native or WebAssembly call.

batch() records operations and executes them only when you request an image, bytes, or a file. This avoids Dart-visible intermediate images.

Encode a batch

final bytes = image
    .batch()
    .resize(800, 600)
    .grayscale()
    .encode(PixerJpegEncoder(quality: 85));

Return an image

final result = image
    .batch()
    .crop(10, 10, 200, 200)
    .rotate90()
    .toImage();

try {
  print('${result.width}x${result.height}');
} finally {
  result.dispose();
}

Save a batch

image.batch().resize(320, 240).saveToFile('thumbnail.png');

The original Pixer remains unchanged. Sequence-dependent validation, such as crop bounds after a resize, is evaluated against the preceding operation’s output.