VioGetFont

This call returns either the font table of the size specified or the font in use.

Syntax
VioGetFont (RequestBlock, VioHandle)

Parameters

 * RequestBlock (PVIOFONTINFO) - input/output: Address of the font structure that returns current RAM font or specified ROM or code page font depending on the request type.
 * VioHandle (HVIO) - input : Reserved word of 0s.

Return Code

 * rc (USHORT) - return:Return code descriptions are:
 * 0 NO_ERROR
 * 355 ERROR_VIO_MODE
 * 421 ERROR_VIO_INVALID_PARMS
 * 438 ERROR_VIO_INVALID_LENGTH
 * 465 ERROR_VIO_DETACHED
 * 467 ERROR_VIO_FONT
 * 494 ERROR_VIO_EXTENDED_SG

Remarks
For reqtype = 1, return ROM font, the font size requested must be supported by the display adapter installed. The 8x8, 8x14, 9x14, 8x16, or 9x16 character font may be requested for the VGA or PS/2 Display Adapters. The 8x8, 8x14, or 9x14 font may be requested for the enhanced graphics adapter. The 8x8 font may be requested for the colour graphics adapter.

Note: Although graphics mode support is provided in VioGetFont, this support is not provided by the Base Video Handlers provided with OS/2.

For reqtype = 1, return ROM font, the far address returned is a ROM pointer only for those fonts where the font table for the full 256-character set is actually contained in ROM. Otherwise, the far address returned is a RAM pointer. Note that for 8x8 on the CGA, the font table for the full 256-character set is returned. For 9x14 or 9x16 the font table for the full 256-character set is also returned. Partial fonts are not returned. The 9x14 and 9x16 fonts are derived from variations of the 8x14 and 8x16 fonts, respectively, where the definitions of fonts for those characters that are different, are replaced.

For VioGetFont specifying reqtype = 1, return ROM font, the font returned is derived from the fonts contained in the system, EGA, VGA, and PS/2 Display Adapter BIOS data areas as applicable. There is an exception for the EGA, VGA and PS/2 Display Adapter when VioSetCp or VioSetFont has been issued. In that case, the font of the size requested is returned from the active code page or the list of user fonts already set.

C
 typedef struct _VIOFONTINFO { /* viofi */ USHORT cb;                 /* length of this structure */ USHORT type;               /* request type */ USHORT cxCell;             /* pel columns in character cell */ USHORT cyCell;             /* pel rows in character cell */ PVOID  pbData;             /* requested font table (returned) */ USHORT cbData;             /* length of caller supplied data area (in bytes) */ } VIOFONTINFO;


 * 1) define INCL_VIO

USHORT rc = VioGetFont(RequestBlock, VioHandle);

PVIOFONTINFO    RequestBlock;  /* Request block */ HVIO            VioHandle;     /* Vio handle */

USHORT          rc;            /* return code */ 

MASM
 VIOFONTINFO struc viofi_cb     dw  ? ;length of this structure viofi_type   dw  ? ;request type viofi_cxCell dw  ? ;pel columns in character cell viofi_cyCell dw  ? ;pel rows in character cell viofi_pbData dd  ? ;requested font table (returned) viofi_cbData dw  ? ;length of caller supplied data area (in bytes) VIOFONTINFO ends

EXTRN VioGetFont:FAR INCL_VIO           EQU 1

PUSH@ OTHER   RequestBlock  ;Request block PUSH  WORD    VioHandle     ;Vio handle CALL  VioGetFont

Returns WORD 