> If your background file isn't in BMP format use image editor like paint to convert it.
I advise you to use XnView. ;)
> Let me know if this helped.
Yes, it worked. I was very surprised, because the long file path contains blanks and Cyrillic characters. :)
> I might had an option in the interface for the background image
I think the best thing to do is in the program will be initially written something like
EditorBkBitmap=texture.bmp
Obviously, if the path is not specified, then it should look where Twistpad.settings is.
> and also support other popular image formats in the next version
I do not think it's necessary. Picture have to adjust to these needs (resize, crop), so why not convert at the same time? Much more important is to make sure that it was possible to make a static image as wallpaper on your desktop. Now the picture is moved, and I have to look for such that tiles the plane.
Notice how the picture looks between line 450 and 451.