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From: Tim Rentsch
Newsgroups: comp.lang.c
Subject: Re: filling area by color atack safety
Date: Wed, 20 Mar 2024 07:27:38 -0700
Organization: A noiseless patient Spider
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Michael S writes:
> On Tue, 19 Mar 2024 11:57:53 +0000
> Malcolm McLean wrote:
>
>> On 19/03/2024 11:18, Michael S wrote:
>>
>>> On Mon, 18 Mar 2024 22:42:14 -0700
>>> Tim Rentsch wrote:
>>>
>>>> Tim Rentsch writes:
>>>>
>>>> Here is the refinement that uses a resizing rather than
>>>> fixed-size buffer.
[...]
> I did a little more investigation gradually modifying Tim's code
> for improved performance without changing the basic principle of
> the algorithm. [...]
I appreciate your doing this. I developed independently a
couple of versions along similar lines.
> So far, this algorithm is fastest among all "local" algorithms
> that I tried. By "local" I mean algorithms that don't try to
> recolor more than one pixel at time.
>
> "Non-local" algorithms i.e. yours and my recursive algorithm that
> recolors St. George cross, are somewhat faster, [...].
I was confused by this statement at first but now I see that
"yours" refers to Malcolm's algorithm.
> The nice thing about Tim's method is that we can expect that
> performance depends on number of recolored pixels and almost
> nothing else.
One aspect that I consider a significant plus is my code never
does poorly. Certainly it isn't the fastest in all cases, but
it's never abysmally slow.
> The second nice thing is that it is easy to understand. Not as
> easy as original recursive method, but easier than the rest of
> them.
>
> If you or somebody else is interested, here is [micro]optimized
> variant: [...]
Good show. I will try to get my latest version posted soon.