Fwd: Re: [Kde-imaging] kdeextragear-libs-1/kipi-plugins

[Renchi Raju]

On Wed, 16 Jun 2004, Aurelien Gateau wrote:

> Le mercredi 16 Juin 2004 18:43, Caulier Gilles a écrit :
> > Le mercredi 16 Juin 2004 01:41, Aurelien Gateau a écrit :
> > > Le mardi 15 Juin 2004 01:01, Renchi Raju a écrit :
> > > > i'm not in favor of using imlib2 for this purpose,
> > >
> > > [snip]
> > > I for one am not in favor of making imlib2 a dependency of kipi-plugins
> > > or even worse libkipi because it's not installed with KDE. One of
> > > Gwenview goals is to be simple to install, so requiring lots of libs is
> > > not good to me.
> >
> > Hum, imlib is a very powerfull API for images manipulations. It's very very
> > fast (MMX, SSE optimized). Do you know ?
>
> I would be very interested to have numbers regarding Imlib2 and Qt
> performances. Did you make some comparison on common features (scaling,
> matrix transforming, depth conversion...) ?

here are results from my benchmarking (code attached. note there is
substantial memory leak in the code which i didn't fix). depth conversion
is not possible with imlib2 :
(the scaling is to 50% of original size).

On a 1600x1200 jpeg file:

Load Image(imlib2):  174.66800 ms
Load Image(qimage):  239.10600 ms
Smooth Scale Image(imlib2):   40.62600 ms
Smooth Scale Image(qimage):  177.22400 ms
Approximate Scale Image(imlib2):   14.59800 ms
Approximate Scale Image(qimage):   17.78500 ms
Rotate image 90 degrees(imlib2):  126.99100 ms
Rotate image 90 degrees(qimage):  270.97400 ms

On a 2592x1944 png file:

Load Image(imlib2):  619.72100 ms
Load Image(qimage):  637.06100 ms
Smooth Scale Image(imlib2):  103.42200 ms
Smooth Scale Image(qimage):  467.91400 ms
Approximate Scale Image(imlib2):   39.18300 ms
Approximate Scale Image(qimage):   45.87900 ms
Rotate image 90 degrees(imlib2):  334.08900 ms
Rotate image 90 degrees(qimage):  442.88000 ms

this is on a athlon 1900+ on debian testing/unstable. on debian the imlib2
library is compiled without mmx optimization.

regards,
renchi

-------------- next part --------------
A non-text attachment was scrubbed...
Name: benchmark.cpp
Type: text/x-c++src
Size: 3275 bytes
Desc: 
Url : http://mail.kde.org/pipermail/kde-imaging/attachments/20040616/c0a96e5e/benchmark-0001.bin