Oh you're using it. So I know why there are those vertical lines on the texture : you're trying to use 3-bytes bitmaps but my function only loads correctly 16-bits non-paletted bitmaps.

EDIT : error spotted. You must not cast to unsigned when calculating distance and angle, because pixels at the left of te center have negative angles.

The screenshot looks cool, but the CX one isn't working. It only shows four black squares at the top of the screen.

Edit: Oh, and you should probably clear the screen at the start of your program, the garbage it displays before starting is a bit ugly

Now I don't see it anymore, either.
If you have lcd_ingray() at the start of your program, it should work without any changes (unless you directly use the timers or other hardware).