68 lines
1.8 KiB
Dart
68 lines
1.8 KiB
Dart
import 'dart:typed_data';
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import 'dart:ui';
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import 'package:matrix/matrix.dart';
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import 'package:native_imaging/native_imaging.dart' as native;
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Future<MatrixImageFileResizedResponse?> customImageResizer(
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MatrixImageFileResizeArguments arguments,
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) async {
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await native.init();
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late native.Image nativeImg;
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try {
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nativeImg = await native.Image.loadEncoded(arguments.bytes); // load on web
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} on UnsupportedError {
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try {
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// for the other platforms
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final dartCodec = await instantiateImageCodec(arguments.bytes);
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final dartFrame = await dartCodec.getNextFrame();
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final rgbaData = await dartFrame.image.toByteData();
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if (rgbaData == null) {
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return null;
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}
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final rgba = Uint8List.view(
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rgbaData.buffer,
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rgbaData.offsetInBytes,
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rgbaData.lengthInBytes,
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);
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final width = dartFrame.image.width;
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final height = dartFrame.image.height;
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dartFrame.image.dispose();
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dartCodec.dispose();
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nativeImg = native.Image.fromRGBA(width, height, rgba);
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} catch (e, s) {
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Logs().e("Could not generate preview", e, s);
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rethrow;
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}
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}
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final width = nativeImg.width;
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final height = nativeImg.height;
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final max = arguments.maxDimension;
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if (width > max || height > max) {
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var w = max, h = max;
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if (width > height) {
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h = max * height ~/ width;
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} else {
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w = max * width ~/ height;
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}
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final scaledImg = nativeImg.resample(w, h, native.Transform.lanczos);
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nativeImg.free();
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nativeImg = scaledImg;
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}
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final jpegBytes = await nativeImg.toJpeg(75);
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return MatrixImageFileResizedResponse(
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bytes: jpegBytes,
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width: nativeImg.width,
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height: nativeImg.height,
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blurhash: arguments.calcBlurhash ? nativeImg.toBlurhash(3, 3) : null,
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);
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}
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