Re: [9fans] graphics scaling

["Steve Simon" <steve@quintile.net>]

Re: fusion
would 9vx running under linux be an interesting option?

re: resample
If you are experimenting with interploation a zoneplate is one of
the best test signals to check your work on, though its
interpretation can be tricky.

/n/sources/contrib/steve/zoneplate.c
http://downloads.bbc.co.uk/rd/pubs/reports/1980-09.pdf
http://downloads.bbc.co.uk/rd/pubs/reports/1978-23.pdf

I thought I remembered page(1) had a simpler interpolation algorithm
which was much faster but much more prone to aliasing, however
looking at the code it seems to use the same kaiser window method.
maybe somone else will remember that code?

for a long time the problem of using a graphics co-processor as a
general purpose Graphics CPU is the speed at which the processed
image can be read back from teh card. I believe there are cards
with dual pci express buses which allow symetric access to the
frame buffer which sidestep this problem (see discussion on 9fans
a month or so ago). If you are resizing the image only for display
like page(1) does this is a non-problem of course.

-Steve