64 lines
1.8 KiB
Dart
64 lines
1.8 KiB
Dart
![]() |
import 'dart:typed_data';
|
||
|
import 'dart:ui';
|
||
|
|
||
|
import 'package:matrix/matrix.dart';
|
||
|
import 'package:native_imaging/native_imaging.dart' as native;
|
||
|
|
||
|
Future<MatrixImageFileResizedResponse?> customImageResizer(
|
||
|
MatrixImageFileResizeArguments arguments) async {
|
||
|
await native.init();
|
||
|
late native.Image nativeImg;
|
||
|
|
||
|
try {
|
||
|
nativeImg = await native.Image.loadEncoded(arguments.bytes); // load on web
|
||
|
} on UnsupportedError {
|
||
|
try {
|
||
|
// 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);
|
||
|
|
||
|
final width = dartFrame.image.width;
|
||
|
final height = dartFrame.image.height;
|
||
|
|
||
|
dartFrame.image.dispose();
|
||
|
dartCodec.dispose();
|
||
|
|
||
|
nativeImg = native.Image.fromRGBA(width, height, rgba);
|
||
|
} catch (e, s) {
|
||
|
Logs().e("Could not generate preview", e, s);
|
||
|
rethrow;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
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,
|
||
|
);
|
||
|
}
|