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List: kde-kimageshop
Subject: Re: Review Request: Krita: Gaussian Blur Filter
From: Boudewijn Rempt <boud () valdyas ! org>
Date: 2009-12-14 19:52:06
Message-ID: 200912142052.07522.boud () valdyas ! org
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On Monday 14 December 2009, schumifer@hotmail.com wrote:
> > Dmitry Kazakov wrote:
> > I might know the reason why it works wrong.
> > Doesn't it look like "border effect"? If so this is surely due to
> > threading of filters. I'm working on this. To prove the fault of
> > threading try limit thread number to 1.
> >
> > Dmitry Kazakov wrote:
> > antiquark, haven't you tried to use fft for that? Does eigen2 support
> > fft? (just an idea)
>
> What needs to be done, is port all the convolution code in Krita to an FFT
> system. This would bring speed-ups to a number of filters in Krita. For
> this I was thinking of the FFTW library. However, this requires a
> significant amount of work.
Let's take this to the mailing list. Eigen is working on fft --
http://eigen.tuxfamily.org/index.php?title=EigenFFT, but I won't t block an
additional dependency if it brings speedups, and fftw seems well-maintained.
Which other filters than convolution would be sped up as well?
--
Boudewijn Rempt | http://www.valdyas.org
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