Add a way to stop running decoding operations about image HOT 5 CLOSED

I'd probably suggest seeing how far you can get with the existing incremental decoding functionality we have. Either ImageDecoder::into_reader or ImageDecoderRect::read_rect. Basically move the early_exit flag into your own code. Only some decoders have meaningful implementations of those, which is mostly a consequence of it being much easier to define an API than to actually implement it for all our decoders...

from image.

I'm already cutting off the data source, but that doesn't seem to help. Do you mean manually reading different parts of the image with read_rect? I don't understand your suggestion yet.

from image.

You have to check the code to see whether the format you're using supports streaming decode. For instance, PNG has a real implementation while JPEG just decodes the entire image into a Vec<u8> when you first call into_reader.

from image.

Well, it sounds like zune-jpeg has given up on implementing streaming decoding, which is fine. But for an image viewer, we need a way to stop decoding. Since I'm planning to maybe move decoding to separate processes, we could just kill them if they don't react. But being able to recycle the process might be neater. But before we have to chase every decoder to support shutdown, we might just go with the brute-force method.

I'm undecided 😆

from image.

I will handle this by putting decoding in a separate process.

from image.