Trying to understand how to use a scaler: here's a sample in SDL using the hq2x scaler.

Except it segfaults. I'm not sure what i'm doing wrong. It's really just a one line invocation.

Invoke with "hqimage door.png. Then press 'b' to make the program attempt to scale and blit the image.

[Edit fixed the segfault.] now i get beautifu black screen - progress!

--- might as well post something interesting -- pretty scalers
hq2x
http://i.imgur.com/4Iy5G.png
http://arkem-nosgat.ovh.org/daggerfall/render_game.html