import 'dart:typed_data'; import 'dart:ui'; import 'package:matrix/matrix.dart'; import 'package:native_imaging/native_imaging.dart' as native; Future customImageResizer( MatrixImageFileResizeArguments arguments) async { await native.init(); var nativeImg = await native.Image.loadEncoded(arguments.bytes); try { nativeImg = await native.Image.loadEncoded(arguments.bytes); // load on web } on UnsupportedError { // for the other platforms final dartCodec = await instantiateImageCodec(arguments.bytes); final dartFrame = await dartCodec.getNextFrame(); final rgbaData = await dartFrame.image.toByteData(); if (rgbaData == null) { return null; } final rgba = Uint8List.view( rgbaData.buffer, rgbaData.offsetInBytes, rgbaData.lengthInBytes); dartFrame.image.dispose(); dartCodec.dispose(); nativeImg = native.Image.fromRGBA( dartFrame.image.width, dartFrame.image.height, rgba); } final width = nativeImg.width; final height = nativeImg.height; final max = arguments.maxDimension; if (width > max || height > max) { var w = max, h = max; if (width > height) { h = max * height ~/ width; } else { w = max * width ~/ height; } final scaledImg = nativeImg.resample(w, h, native.Transform.lanczos); nativeImg.free(); nativeImg = scaledImg; } final jpegBytes = await nativeImg.toJpeg(75); return MatrixImageFileResizedResponse( bytes: jpegBytes, width: nativeImg.width, height: nativeImg.height, blurhash: arguments.calcBlurhash ? nativeImg.toBlurhash(3, 3) : null, ); }