Instant flood fill with HTML Canvas

Re:Instant flood fill with HTML Canvas by thrashh on Tuesday May 23, 2023 @05:47PM (#36051273)

There's no reason a JIT'd runtime is going to find this job challenging or slow at all.

I don't know what OP's original code is but maybe OP was calling a Canvas API method for every pixel (super bad).

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Re:Instant flood fill with HTML Canvas by shaneos on Tuesday May 23, 2023 @06:08PM (#36051451)

I wasn’t calling per pixel :-) even when just visiting each pixel once it would still take 50 - 100ms to fill a large image which the user perceives as lag. I wanted it to be instant

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Re:Instant flood fill with HTML Canvas by johnfn on Tuesday May 23, 2023 @09:45PM (#36053062)

I've tried writing a fast flood fill in JS and it's a lot more challenging than you and GP make it out to be. If it's really so straightforward, you should produce code. Otherwise, these comments don't add much to the discussion.

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Re:Instant flood fill with HTML Canvas by kragen on Tuesday May 23, 2023 @11:38PM (#36053788)

i'd be surprised if someone could do it within the editing window for an hn comment, but it doesn't seem like more than a day or two of work for double-digit megapixel fill rates

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