Adventuron will stretch them automatically, you don't need to do anything in the code.
Targetting 8-bit too?
Yeah, I'll try. I will review the DAAD documentation (I already used inPAWS (works well under Linux), so I know a little bit about the principle). I'm not going to code right away, and I had failed to compile from Adventuron to DAAD under Linux. For now, I have my graphics and level design to finish!