SDL_gfx: SDL_gfx Library.
SDL_gfx: 
SDL_gfx: SDL graphics drawing  primitives  and other support functions. The
SDL_gfx: SDL_gfx  library  evolved  out of the SDL_gfxPrimitives code which
SDL_gfx: provided basic drawing routines such as lines, circles or polygons
SDL_gfx: and SDL_rotozoom which  implemented a interpolating rotozoomer for
SDL_gfx: SDL surfaces.
SDL_gfx: 
SDL_gfx: homepage: http://www.ferzkopp.net/Software/SDL_gfx-2.0/
SDL_gfx:
SDL_gfx: