Combine frames with transparency about omggif HOT 3 CLOSED

It depends on the "disposal" of the frame, the GIF spec has more details, but as a very simple and not complete example:

https://github.com/deanm/omggif/blob/master/plask_viewer.js#L30

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What about building this into omggif, so users don't have to care about any "disposal"?

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I don't really think this fits into omggif, because for example how you handle transparency, how you clear your output to a solid color, etc, these are things that are usually handled in whatever specific system (canvas, etc) you are using, and not something to be handled by omggif itself, otherwise I would have handled it there. See the plask viewer as an example, omggif can't know about the clear() method on Plask's canvas, etc.

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