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If you are right that would be amazing! The demo code is open source, please send a PR with such a flood fill implemented.

The requirement is that when the user clicks on a 2k x 2k image it takes 50ms or less, running on a cheap Android tablet. If a better algorithm, perhaps implemented in wasm, can achieve this, I’d love to discard all my complex code and just use it

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I love that everybody commenting here here emphatically insists that you must be doing it wrong, but real-world solutions are nowhere to be found. I admire your commitment to keeping a positive tone, but you'd be justified in feeling some frustration.

I do hope a PR shows up in the next few days so the internet can stop having this debate and move on with a good library.

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