DDI Functions

Article
06/30/2006

All display drivers must implement DDI functions. However, only DrvEnableDriver must be exported from the display driver's DLL, which means that only DrvEnableDriver can use this exact name. If your display driver must use the PCI information in the registry, as populated by the PCI bus driver, it needs to implement and export DisplayInit. You can customize the names for the other functions because they are exposed to the GDI through function pointers that are returned by DrvEnableDriver. Regardless of name, all functions must follow the prototypes in the Winddi.h header file.

The following table shows the DDI functions that display drivers must include.

Function	Description
DisplayInit	Passes instance information, which allows the driver to find PCI configuration information for its device. The PCI bus driver populates the information if the driver has a PCI template in the platform registry. This is the first display driver function called by GWES.
DrvAnyBlt	Performs bit block transfers, with stretching or transparency.
DrvBitBlt	Performs general bit block transfers, with clipping and masking. Maps to the MoveToEx, Polygon, Polyline, Ellipse, Rectangle, PolyBezier, SetPixel, BitBlt, MaskBlt, Rectangle, ExtTextOut, DrawText, and ExtTextOut GDI functions.
DrvCopyBits	Sends a GDI-created print band to a printer driver. Maps to the SetDIBitsToDevice GDI function.
DrvCreateDeviceBitmap	Creates and manages bitmap files.
DrvDeleteDeviceBitmap	Deletes a device bitmap file.
DrvDisableDriver	Notifies the display driver that the GDI no longer needs it and is ready to unload the driver.
DrvDisablePDEV	Notifies the driver that the GDI no longer needs a particular display device.
DrvDisableSurface	Notifies the driver that the GDI no longer needs a particular drawing surface.
DrvEnableDriver	Returns pointers to DDI functions to GDI. The initial entry point that is exposed by the driver. The driver exposes the second entry point if DisplayInit is implemented.
DrvEnablePDEV	Returns a PDEV structure to the GDI. A PDEV structure is a logical representation of a physical display device.
DrvEnableSurface	Creates a drawing surface and associates it with PDEV.
DrvEndDoc	Sends any control information that is needed to finish printing a document.
DrvEscape	Retrieves information from a device that is not available in a device-independent DDI. This function operates the same as with Windows NT, except that Windows CE does not support the DrvDrawEscape function.
DrvFillPath	Fills a drawing path with a brush. Maps to the MoveToEx, Polygon, Polyline, Ellipse, Rectangle, and PolyBezier GDI functions.
DrvGetMasks	Gets the color masks for the display device's current mode.
DrvGetModes	Lists the display modes that are supported by the display device.
DrvMovePointer	Moves the pointer with a guarantee that the GDI will not interfere with the operation.
DrvPaint	Paints a specified region with a brush. Maps to the MoveToEx, Polygon, Polyline, Ellipse, Rectangle, and PolyBezier GDI functions.
DrvPowerHandler	Called to handle POWER_UP and POWER_DOWN notifications.
DrvRealizeBrush	Creates a brush with parameters that are specified by the GDI.
DrvRealizeColor	Maps an RGB color onto the closest available color that is supported by the device.
DrvSetPalette	Sets the display device's palette.
DrvSetPointerShape	Sets the pointer to a new shape and updates the display.
DrvStartDoc	Sends any control information that is needed to start printing a document.
DrvStartPage	Sends any control information that is needed to start printing a new page.
DrvStrokePath	Renders a drawing path. Maps to the MoveToEx, Polygon, Polyline, Ellipse, Rectangle, and PolyBezier GDI functions.
DrvStrokeAndFillPath	Maps to the MoveToEx, Polygon, Polyline, Ellipse, Rectangle, and PolyBezier GDI functions.
DrvTransparentBlt	Bit block transfer, with transparency.
DrvUnrealizeColor	Maps a color in the display device's format onto an RGB value.

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