GDI / DDI
Capabilities
In graphics display driver speak, capabilities refers
to the list of graphics operations which a device
driver will handle rather than letting the system
perform the operation. The GDI will query the
display driver for its capabilities. This is necessary because different graphics adapters will be able to handle different sets of operations.
Performance
If a display driver elects to handle an operation such
as a BitBlt, then it should do so at faster performance than the what the system can provide. Usually, the display driver will handle the operation
only if hardware assistance is provided.