[Feature Request] decodeAvif

[Glutamat42]

it would be nice if i could decode avif images so i can convert avif to jpeg. I would like to work with avif images in my app, but for sharing/downloading i want to convert them to jpeg as this format has way broader support.

[yekeskin]

Thank for the suggestion. I will try to add it to the next release. In the meantime, you can use the following code to get the decoded image:

final bytes = await rootBundle.load("assets/butterfly.avif");
final codec = SingleFrameAvifCodec(bytes: bytes.buffer.asUint8List()); // MultiFrameAvifCodec for animated images
await codec.ready();

final AvifFrameInfo frame = await codec.getNextFrame();
// frame.image
codec.dispose();

frame.image is an instance of dart:ui Image class. You can use a plugin like image to convert it to the desired format.

[Glutamat42]

Thanks for the code snippet. Got it working, althought it was not directly straight forward as i got type errors (different types of Image)

final codec = SingleFrameAvifCodec(bytes: fileBytes);
await codec.ready();
final image = await codec.getNextFrame();

final byteData = await image.image.toByteData(format: ImageByteFormat.png);
final pngBytes = byteData!.buffer.asUint8List();
fileBytes = await FlutterImageCompress.compressWithList(pngBytes, format: CompressFormat.jpeg, quality: 90);
// alternative with Image package
// final img.Image? imageLibImage = img.decodeImage(pngBytes);
// final jpegFileBytes = img.encodeJpg(imageLibImage!, quality: 90);

codec.dispose();

[yekeskin]

You can directly convert dart:ui Image to image library. https://github.com/brendan-duncan/image/blob/main/doc/flutter.md#convert-a-flutter-ui-image-to-the-dart-image-library