29 lines
1.0 KiB
Dart
29 lines
1.0 KiB
Dart
import 'package:flutter/foundation.dart';
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import 'package:image/image.dart' as img;
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const int _avatarMaxDimension = 1024;
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const int _avatarTargetBytes = 900 * 1024;
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Future<Uint8List?> compressAvatar(Uint8List input) => compute(_encodeAvatar, input);
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Uint8List? _encodeAvatar(Uint8List input) {
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final decoded = img.decodeImage(input);
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if (decoded == null) return null;
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final oriented = img.bakeOrientation(decoded);
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final image = oriented.width > _avatarMaxDimension || oriented.height > _avatarMaxDimension
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? img.copyResize(
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oriented,
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width: oriented.width >= oriented.height ? _avatarMaxDimension : null,
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height: oriented.height > oriented.width ? _avatarMaxDimension : null,
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interpolation: img.Interpolation.average,
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)
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: oriented;
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var quality = 88;
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var out = img.encodeJpg(image, quality: quality);
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while (out.lengthInBytes > _avatarTargetBytes && quality > 35) {
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quality -= 12;
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out = img.encodeJpg(image, quality: quality);
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}
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return out;
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}
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