DrawMask

typedef byte DrawMask[8];

The graphics system uses this structure for defining custom draw masks.

DriveType

typedef ByteEnum DriveType;
#define DRIVE_5_25				0
#define DRIVE_3_5				1
#define DRIVE_FIXED				2
#define DRIVE_RAM				3
#define DRIVE_CD_ROM				4
#define DRIVE_8				5
#define DRIVE_UNKNOWN				0xf
} DriveType;

Several routines (in particular, DriveGetStatus()) provide information about drives used by the computer running GEOS. These routines return a member of the DriveTypes enumerated type. Note that while the type is byte-length, all of the values are guaranteed to fit in four bits; thus, routines like DriveGetStatus() can return a DriveTypes value in the low four bits and other flags in the high four bits of a single byte.

DriverAttrs

typedef WordFlags DriverAttrs;
#define DA_FILE_SYSTEM						0x8000
#define DA_CHARACTER						0x4000
#define DA_HAS_EXTENDED_INFO						0x2000

This record contains flags that indicate a given driver's attributes. This record is stored in the driver's DriverInfoStruct structure.

DriverExtendedInfoStruct

typedef struct {
DriverInfoStruct			DEIS_common;			/* The base driver info structure */
MemHandle			DEIS_resource;			/* Handle of driver's DriverExtendedInfo
						 * table. */
} DriverExtendedInfoStruct;

This structure is used by Preferences to locate the names of devices supported by a particular driver.

DriverExtendedInfoTable

typedef struct {
LMemBlockHeader			DEIT_common;
word			DEIT_numDevices;
ChunkHandle			DEIT_ChunkHandle;
word			DEIT_infoTable;
} DriverExtendedInfoTable;

DriverInfoStruct

typedef struct {
 void (*DIS_strategy)();							/* Pointer to strategy routine */
 DriverAttrs		DIS_driverAttributes;					/* driver's attribute flags */
 DriverType		DIS_driverType;					/* driver's type */
} DriverInfoStruct;

This structure defines the characteristics of a particular driver. In general, applications will not need to access this structure unless they use a driver directly.

DriverType

typedef enum {
DRIVER_TYPE_VIDEO = 1,					/* Video drivers */
DRIVER_TYPE_INPUT,					/* Input (keyboard, mouse) drivers */
DRIVER_TYPE_MASS_STORAGE,					/* Disk/Drive drivers */
DRIVER_TYPE_STREAM,					/* Stream and port drivers */
DRIVER_TYPE_FONT,					/* Font drivers */
DRIVER_TYPE_OUTPUT,					/* Output (not video and printer) drivers */
DRIVER_TYPE_LOCALIZATION,					/* Localization drivers */
DRIVER_TYPE_FILE_SYSTEM,					/* File system drivers */
DRIVER_TYPE_PRINTER,					/* Printer drivers */
DRIVER_TYPE_SWAP,					/* Swap drivers */
DRIVER_TYPE_POWER_MANAGEMENT,					/* Power management drivers */
DRIVER_TYPE_TASK_SWITCH,					/* Task switch drivers */
DRIVER_TYPE_NETWORK					/* Network file system drivers */
} DriverType;

This enumerated type has one value for each type of driver in the system. It is used primarily with GeodeUseDriver() and its associated routines. Each driver stores its type in its DriverInfoStruct structure.

ElementArrayHeader

typedef struct {
ChunkArrayHeader			EAH_meta;			/* chunk array header structure */
word			EAH_freePtr;			/* First free element */
} ElementArrayHeader;

Every element array must begin with an ElementArrayHeader . Since element arrays are special kinds of chunk arrays, the ElementArrayHeader must itself begin with a ChunkArrayHeader . The structure contains one additional field, EAH_freePtr . This is used to keep track of the freed elements in the element array. Applications should not examine or change this field.

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