decoder.decode runtime problem since version 4.1.4

[Mike-3]

We have found that decode animated gifs with version 4.1.4 takes approx. 50 times longer than with version 4.1.3.
In version 4.1.7 it is still like this.

Here are my recorded times for different versions, for the example gif.

4.1.2 approx 1s
4.1.3 approx 1s
4.1.4 approx 56s
4.1.7 approx 56s

Example gif:
http://up.picr.de/18592631jk.gif

Source code

  final decoder = Image.findDecoderForData(bytes);

    if (decoder == null) return null;
var startTime = DateTime.now();
    var animation = <Image.Image>[];
    var image = decoder.decode(bytes);
print(DateTime.now().difference(s).inMilliseconds.toString());

[brendan-duncan]

Thanks for reporting this, I'll get it sorted out as soon as I can.

[brendan-duncan]

The palette remapping code that was added to handle GIFs per-frame palettes is terribly slow currently, so I disabled it for now. The example gif you provided still parses correctly, but GIF is a weird format so some edge case gifs might have a problem without the remapping. I'll have to find a faster way to do that.

[brendan-duncan]

The version in git should be a lot faster than it was. It will still have some overhead over the 4.1.3 version, but the 4.1.3 version had a lot of issue with animated gifs.