DDX

Device Dependent X. The DDX layer or ddx library contains the device dependent X server code that is used to port support for graphics adapter hardware. The DDX layer provides a software interface to a conceptual hardware device. The imagined device provides definitions for the screen and graphics context (GC) including primitives for drawing lines, arcs, text, and so on. These primitives may be provided by in the hardware, or they may be built from even simpler primitives found in the hardware. The DDX layer includes the mi (machine independent), mfb (monochrome frame buffer), cfb (color frame buffer) layers.