/* init PC ROM routines, must be called in graphics mode*/
void
pcrom_init(PSD psd)
{
char * p;
/* use INT 10h to get address of rom character table*/
rom_char_addr = int10(FNGETROMADDR, GETROM8x14);
#if 0
/* check bios data area for actual character height,
* as the returned font isn't always 14 high
*/
ROM_CHAR_HEIGHT = GETBYTE_FP(MK_FP(0x0040, 0x0085));
if(ROM_CHAR_HEIGHT > MAX_ROM_HEIGHT)
ROM_CHAR_HEIGHT = MAX_ROM_HEIGHT;
#endif
p = getenv("CHARHEIGHT");
if(p)
ROM_CHAR_HEIGHT = atoi(p);
}
/*
* PC ROM low level routine to get the bitmap associated
* with a character. Handles bios ROM font only.
*/
void
pcrom_gettextbits(PMWFONT pfont, int ch, const MWIMAGEBITS **retmap,
MWCOORD *pwidth, MWCOORD *pheight, MWCOORD *pbase)
{
FARADDR bits;
int n;
static MWIMAGEBITS map[MAX_ROM_HEIGHT * ROM_CHAR_WIDTH / MWIMAGE_BITSPERIMAGE];
MWIMAGEBITS *bitmap = map;
/* read character bits from rom*/
bits = rom_char_addr + ch * ROM_CHAR_HEIGHT;
for(n=0; n<ROM_CHAR_HEIGHT; ++n)
*bitmap++ = GETBYTE_FP(bits++) << 8;
*retmap = map;
*pwidth = ROM_CHAR_WIDTH;
*pheight = ROM_CHAR_HEIGHT;
*pbase = ROM_CHAR_HEIGHT;
}
void
ega_hwterm(void)
{
setmode(MODE_SET);
/* Copy character table from ROM back into bit plane 2 before turning
* off graphics.
*/
out_word(SEQREG, 0x0100); /* syn reset */
out_word(SEQREG, 0x0402); /* cpu writes only to map 2 */
out_word(SEQREG, 0x0704); /* sequential addressing */
out_word(SEQREG, 0x0300); /* clear synchronous reset */
out_word(GRREG, 0x0204); /* select map 2 for CPU reads */
out_word(GRREG, 0x0005); /* disable odd-even addressing */
#if ROMFONT
{
FARADDR srcoffset;
FARADDR destoffset;
int data;
int ch;
int row;
srcoffset = rom_char_addr;
destoffset = EGA_BASE;
for (ch = 0; ch < FONT_CHARS; ch++) {
for(row = 0; row < ROM_CHAR_HEIGHT; row++) {
data = GETBYTE_FP(srcoffset++);
PUTBYTE_FP(destoffset++, data);
}
destoffset += (RAM_SCAN_LINES - ROM_CHAR_HEIGHT);
}
}
#endif
/* Finally set the registers back for text mode. */
writeregs(graph_off);
}
