Integrate with external image codec

[dogtopus]

What is the best approach to integrate the image crate with an external codec? I'm looking for specifically what intermediate steps to do to efficiently and safely load an image into a say DynamicImage type, as well as saving a DynamicImage type as the target format.

The high-level API seems to be hardcoded to only use the built-in codecs via an enum and not taking a codec that implements the ImageDecoder/ImageEncoder trait so that's off the table.

[fintelia]

I'm not sure that there's one single best option. For loading, you can implement ImageDecoder and then call DynamicImage::from_decoder. Or just directly write a method that takes a reader and returns a DynamicImage. We don't have a similar convenience method for encoding, but given a dynamic image the DynamicImage::color and DynamicImage::as_bytes methods should give you the information you need to implement your encoder.