The SDL_gfx library evolved out of the SDL_gfxPrimitives code which provided basic drawing routines such as lines, circles or polygons for SDL Surfaces. The current components of the SDL_gfx library are: - Graphic Primitives (SDL_gfxPrimitves.h) - Rotozoomer (SDL_rotozoom.h) - Framerate control (SDL_framerate.h) - MMX image filters (SDL_imageFilter.h)