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Display Driver
The display driver is responsible for interacting with the display hardware
and the graphics device interface (GDI) module of Microsoft Windows. A display
driver should support inking to provide the user with visible feedback as the pen
moves. Technically, the Pen API does not require inking support from the
display driver. However, the system is far more practical and convenient when the
user can see the ink trail left by the pen.
Two types of display drivers are supported: Display Control Interface (DCI)
drivers (called DCI Providers) and non-DCI drivers, such as older VGA or 8514 drivers. For DCI Providers,
no extra work is required to support the pen interface.
To support inking in a non-DCI driver, the display driver must be able to:
- Export the GetLPDevice function to provide Windows with a value identifying the pen hardware.
- Export the InkReady function, which Windows calls to notify the driver that the pen is in motion
and Windows is ready to display ink. InkReady must be able to handle calls during system interrupts.
- Provide a pointer in the shape of a pen.
Windows  not the display driver displays the ink. When Windows receives notice through its InkReady function, the driver calls back into Windows to draw the ink.
For more details on display drivers, refer to the device driver kit (DDK) for
Windows 95.
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