For rendering operations, the driver must first enable a surface for each PDEV (a logical representation of a physical device) that is enabled. If the hardware can set up as a GDI standard-format bitmap, GDI can be used to do all or some of the drawing to the bitmap surface. GDI can also handle advanced halftoning.
For information on enabling PDEVs and surfaces, refer to DrvEnablePDEV and DrvEnableSurface in the Graphics Driver Reference.