Driver managementEvery printer driver must have a GDIINFO structure that specifies the printer's capabilities and characteristics. GDI uses this information to determine what the printer can do and how much GDI must do to support graphics output to the printer. The GDI information can be classified as follows:
Driver management
Driver capabilities
Device dimensions
The driver-management information specifies the version of Windows for which the driver was written, the type of technology the printer uses to generate output, the size in bytes of the printer's PDEVICE structure, and number of device contexts the driver can manage at the same time.
The driver-capabilities information specifies the capabilities of the device, such as whether the printer can draw polygons and ellipses, scale text, and clip output. Driver capabilities also specify the number of device brushes, pens, fonts, and colors available on the printer and whether the printer can handle bitmaps and color palettes.
The device-dimension information specifies the maximum width and height of the printable area in both millimeters and device units, the number of color bits or planes, the aspect ratio, the minimum length of a dot in a styled line, and the number of device units or pixels per inch.