Not all gifs are rendered properly about omggif HOT 4 CLOSED

Perhaps you could just attach some GIFs that aren't working properly? 50% seems quite high, perhaps something else is happening

from omggif.

I'm pulling gifs from giphy's api
Here is one that renders incorrectly
http://media1.giphy.com/media/l2JJB3GtJDex2DXdC/giphy.gif

and here is one that is working
http://media2.giphy.com/media/l4KibWpBGWchSqCRy/giphy.gif

also to be clear this loading these files, creating a reader, and then decodeAndBlitFrameRGBA to a canvas.

from omggif.

I found something. If you pass the same ImageData.data to all of the frames this issue seems to be fixed, but this doesn't work at all for transparent gifs because the prior frames are also visible.

from omggif.

This doesn't have to do with omggif, this just has to do with how GIFs work. See the comment:

And you can read about how disposal works in the spec:

https://www.w3.org/Graphics/GIF/spec-gif89a.txt

But note that most browsers deviate from the spec, and this is one of those cases. I tried to note the behaviour I know about in the source code.

In short: Some frames ask to draw over the previous frame, and some frames ask for the background to be cleared. You can check the disposal from frameInfo() to see what you should do.

In your case it is probably enough just to clear when dispose is 2.

from omggif.