[Marble-devel] New scanline access method
tackat at t-online.de
Sat Nov 7 10:59:55 CET 2009
Interesting indeed (I wasn't aware of the detach).
Have you tried without changing the c-cast into a reinterprete cast?
Am Samstag 07 November 2009 08:08:58 schrieb Carlos Licea:
> Reading through the planet I found this post:
> When I checked the repository I found:
> e- guide/qimage.xml
> I immediately remembered that we use QImage::scanLine method in the
> ScanLine approach and sat down to try the new approach.
> Here you have the patch.
> Short story: doesn't seem to work.
> Long story: I didn't do any very deep analysis just ran marble with the
> option --timedemo and here are the results (they are not averages of
> multiple runs, I just ran them a couple of times and wrote the value once
> when I saw that I didn't have any gains):
> Old approach New approach
> Spherical 45414ms"=4.40383 fps" 58491ms"=3.41933 fps"
> Equirectangular 58673ms"=3.40872 fps" 61583ms"=3.24765 fps"
> Mercator 66459ms"=3.00937 fps" 71495ms"=2.7974 fps"
> It's really thrilling that we not only we are not improving, but that we
> are having even worse performance.
> PS: I couldn't CC the author of the post. I wasn't able to find his email
> address (not that I really, really tried).
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