Any plan to support progressive animated image decoding ? (Like Chrome or SDAnimatedImage)

[dreampiggy]

Issue

YYImage + YYAnimatedImageView, current does not allows to play animation, during progressive image download.

The issue is because that YYImageDecoder disable this support, so that YYImage can not get correct frame even if the original image data was updated.

See the code here:

YYWebImage/YYWebImage/Image/YYImageCoder.m

Lines 1970 to 1971 in 093193c

	if (!_finalized) { // ignore multi-frame before finalized
	_frameCount = 1;

That // ignore multi-frame before finalized comment seems disable this feature.

Because of this, so that image && imageView have no way to do animation during progressive download.

Reason

Why I want to fire this, it's because that SDWebImageYYPlugin want to support this behavior with YYImage. It's a plugin to embed YYImage/YYCache into SDWebImage loading system. Due to this, we can only support static progressive image decoding && normal animation decoding, no progressive animation supports.

So I'll glad to see if there are any plan to support this behavior.