Scanlines without HWA

Anyone have any suggestions on how to implement scanlines without going the HWA route? I have already made my game 640x480, but now that I need to paint my bg tiles, I think I might need to reduce the game's size to alleviate some of the workload. Otherwise, I will be painting tiles for a LONG time. :(

Also, is there a simple way to double the window size at runtime (ie make the game 320x240 but display it as 640x480)?

Thanks in advance,

Mobichan

i guess you could cheat and use a quick backdrop with horizontal lines (putting it on its own layer of course)

also, try resizing the application window and using "resize display to fill window size"

The problem with the resize option is that it can lose the aspect ratio of the original window size. Is there a way to force ONLY x2 resolution or stretch to fill screen resolution? I really just wanted to double the display size without getting bad artifacting or filtering.

Also, is MMF2 HWA easy to use? I might consider going that route in the future.