refactor: Better custom image resizer
parent
d182e1ecea
commit
8366ccee70
@ -1,67 +1,103 @@
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import 'dart:typed_data';
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import 'dart:ui';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/painting.dart';
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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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(int, int) _scaleToBox(int width, int height, {required int boxSize}) {
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final fit = applyBoxFit(
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BoxFit.scaleDown,
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Size(width.toDouble(), height.toDouble()),
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Size(boxSize.toDouble(), boxSize.toDouble()),
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).destination;
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return (fit.width.round(), fit.height.round());
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}
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Future<MatrixImageFileResizedResponse?> customImageResizer(
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MatrixImageFileResizeArguments arguments,
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) async {
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if (kIsWeb) {
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throw UnsupportedError(
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'customImageResizer only supports non-web platforms.',
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);
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}
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await native.init();
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late native.Image nativeImg;
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var imageBytes = arguments.bytes;
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String? blurhash;
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var originalWidth = 0;
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var originalHeight = 0;
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var width = 0;
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var height = 0;
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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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// for the other platforms
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final dartCodec = await instantiateImageCodec(arguments.bytes);
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final frameCount = dartCodec.frameCount;
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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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width = originalWidth = dartFrame.image.width;
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height = originalHeight = dartFrame.image.height;
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dartFrame.image.dispose();
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dartCodec.dispose();
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var nativeImg = native.Image.fromRGBA(width, height, rgba);
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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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dartFrame.image.dispose();
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dartCodec.dispose();
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final width = nativeImg.width;
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final height = nativeImg.height;
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if (arguments.calcBlurhash) {
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// scale down image for blurhashing to speed it up
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final (blurW, blurH) = _scaleToBox(width, height, boxSize: 100);
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final blurhashImg = nativeImg.resample(
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blurW, blurH,
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// nearest is unsupported...
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native.Transform.bilinear,
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);
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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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blurhash = blurhashImg.toBlurhash(3, 3);
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blurhashImg.free();
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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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if (frameCount > 1) {
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// Don't scale down animated images, since those would lose frames.
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nativeImg.free();
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} else {
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final max = arguments.maxDimension;
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if (width > max || height > max) {
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(width, height) = _scaleToBox(width, height, boxSize: max);
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final scaledImg =
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nativeImg.resample(width, height, native.Transform.lanczos);
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nativeImg.free();
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nativeImg = scaledImg;
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}
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imageBytes = await nativeImg.toJpeg(75);
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nativeImg.free();
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}
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} catch (e, s) {
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Logs().e("Could not generate preview", e, s);
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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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bytes: imageBytes,
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width: width,
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height: height,
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originalWidth: originalWidth,
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originalHeight: originalHeight,
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blurhash: blurhash,
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);
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}
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