Review Request: Krita: Gaussian Blur Filter

[Dmitry Kazakov]

The link you provided says eigen does not support multidimentional fft. For
our case, i guess, we need the one.

On Mon, Dec 14, 2009 at 10:52 PM, Boudewijn Rempt <boud at valdyas.org> wrote:

> On Monday 14 December 2009, schumifer at 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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-- 
Dmitry Kazakov
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