GDI Drawing Services, Other

To support the CLIPOBJ, BRUSHOBJ, and XFORMOBJ, GDI offers several drawing services, listed in the following table, in addition to the GDI simulations described earlier in Hooking versus Punting.

GDI Draw Service Function	Description
EngCreateClip	Allocates a CLIPOBJ for the driver’s temporary use. The driver should call EngDeleteClip to delete it when it is no longer needed.
EngDeleteClip	Deletes a CLIPOBJ allocated with EngCreateClip.
EngBitBlt	GDI simulation for DrvBitBlt.
EngCopyBits	GDI simulation for DrvCopyBits.
EngStretchBlt	GDI simulation for DrvStretchBlt.
EngFillPath	GDI simulation for DrvFillPath.
EngStrokeAndFillPath	GDI simulation for DrvStrokeAndFillPath.
EngPaint	GDI simulation for DrvPaint.
EngStrokePath	GDI simulation for DrvStrokePath.
EngLineTo	GDI simulation for DrvLineTo.
BRUSHOBJ_pvAllocRbrush	Allocates memory for the driver’s realization of a brush.
BRUSHOBJ_pvGetRbrush	Returns a pointer to the driver’s realization of the brush. Realizes the brush if it has not yet been realized.
CLIPOBJ_cEnumStart	Sets parameters for enumeration of the rectangles in all or part of the clipped region. (The region can be enumerated once without this call).
CLIPOBJ_bEnum	Retrieves a batch of rectangles from the clip region.
CLIPOBJ_ppoGetPath	Can be used to retrieve complicated regions as a path.

For more information on these functions, refer to the Graphics Driver Reference.