flutter_bicubic_resize library

Fast, consistent bicubic image resizing for Flutter.

This library provides native C-based bicubic image resizing that produces identical results on iOS and Android. Uses Catmull-Rom interpolation (same as OpenCV and PIL/Pillow).

Features

• 100% Native C performance (stb_image + stb_image_resize2)
• Identical results on iOS and Android
• Bicubic interpolation with multiple filter options
• Full native pipeline: decode -> resize -> encode
• RGB and RGBA support
• JPEG and PNG support with alpha channel preservation

Quick Start

import 'package:flutter_bicubic_resize/flutter_bicubic_resize.dart';

// Resize JPEG
final resized = BicubicResizer.resizeJpeg(
  jpegBytes: originalBytes,
  outputWidth: 224,
  outputHeight: 224,
);

// Resize PNG
final resizedPng = BicubicResizer.resizePng(
  pngBytes: originalBytes,
  outputWidth: 224,
  outputHeight: 224,
);

Available Filters

• BicubicFilter.catmullRom - Default. Same as OpenCV/PIL. Best for ML.
• BicubicFilter.cubicBSpline - Smoother, more blurry.
• BicubicFilter.mitchell - Balanced between sharp and smooth.

See the API documentation for detailed usage information.